Best Invoicing Software for Interior Designers: 12 Tools Ranked for 2026

Interior designers do not write "invoices." They run a two-ledger billing operation. One side tracks the design fee: a signed retainer, phase-based milestone payments at concept approval and design development, and hourly overage billed against a cap. The other side tracks product: furniture specified at MSRP, bought at trade cost, marked up to the client, deposited with vendors, freight-reconciled at receiving, and final-billed after install. A solo designer on a $150,000 whole-home project is issuing roughly 14-22 separate invoices and 15-25 vendor purchase orders over 9-14 months, with every item carrying two prices that must never appear on the same client document.

The invoicing tool that handles a $500 logo design cleanly will break on this workflow. It will not hold retainers as a client-liability balance until earned, it will not store trade cost and client price on the same product record, it will not generate a purchase order at trade pricing and a client invoice at retail pricing from one action, and it will not reconcile vendor deposits against final invoices when the sofa arrives 9 weeks after payment. The 2025 ASID Economic Outlook reported that 62% of independent design firms name "time spent on admin" as their top operational constraint, and procurement errors (wrong quantities, missed trade discounts, freight miscategorized as revenue) cost the average small residential firm 4-7% of product margin annually.

This list ranks 12 platforms against the real interior design billing workflow: retainer collection and liability tracking, milestone billing tied to approval gates, trade-vs-retail pricing protection, vendor PO generation linked to client invoices, freight and pass-through cost separation, multi-project reconciliation, and integrations with QuickBooks, Xero, and the specialty procurement tools designers actually use. Every price was verified against official pricing pages on April 19, 2026.

Quick-Scan Comparison: Interior Design Invoicing Tools

What Interior Design Invoicing Software Actually Needs to Do

Generic invoicing tools were built around one simple assumption: the seller creates an invoice, the buyer pays it, and the money hits revenue. Interior design billing breaks every part of that assumption. Here is the workflow an invoicing tool has to hold together for a running design studio:

Retainer and deposit handling as a liability, not revenue. When a client pays a 50% design fee retainer at LOA signing, that money is not earned revenue until the work is performed. Proper treatment holds it as a liability (client deposit) on the balance sheet and moves it to revenue as phases complete. Tools that book retainers as income on day one misstate your books, cause issues at tax time, and overstate monthly revenue to anyone reading your P&L.

Trade-vs-retail pricing protection. Every specified product has two prices. Trade (or "net") is what you pay the vendor after the designer discount (typically 25-50% off MSRP). Retail is what the client pays -- your trade cost plus your markup (commonly 15-35% on residential, 10-20% on commercial). The invoicing tool must separate these cleanly so the client invoice shows only retail, the vendor PO shows only trade, and your margin on the project is calculable without pivot tables.

Milestone billing across long project timelines. A residential whole-home runs 9-18 months. A typical billing schedule: 50% design retainer at LOA, 25% at concept approval, 15% at design development sign-off, 10% at final reveal, plus product invoices issued room-by-room after client approval and separately reconciled at receiving. Tools that model "one invoice per project" require manual workarounds on every project.

Vendor PO-to-client-invoice reconciliation. When you specify a $3,500 MSRP sofa at 30% trade discount with 20% markup, you pay the vendor $2,450 (trade cost after discount) and bill the client $2,940 (trade cost plus 20%). The freight ($180), sales tax, and receiving fees all need to flow through separately. At project reconciliation, every vendor PO needs to match back to the corresponding client invoice line, every deposit needs to match to a final payment, and freight needs to be a pass-through, not profit.

Client portal with tearsheets and approvals. Interior design invoices are not standalone documents. A client invoice for "Living Room FF&E Package -- $28,450" makes no sense without the approved selection sheet showing which sofa, rug, coffee table, and lighting the client signed off on. The portal must hold the visual approvals alongside the billing, with timestamps that resolve the "I never approved that" disputes.

Time tracking for hourly design work and margin analysis. Even flat-fee designers need to track hours internally. A $25,000 design fee on a project that consumed 280 hours yields an $89 effective hourly rate. The same project consumed at 420 hours yields $59. Without hour tracking per phase, you cannot diagnose whether revision rounds, site visits, or construction coordination is eating your margin.

1. Agiled: Best All-in-One Invoicing Platform for Interior Designers

Agiled is the only platform on this list that bundles invoicing with milestone billing and deposits, CRM, proposals, contracts with e-signatures, project management, time tracking, and a branded client portal in a single workspace starting free. For interior design studios running FreshBooks for invoicing, DocuSign for contracts, Asana for projects, Toggl for time tracking, and a shared Dropbox for tearsheets, Agiled replaces the business-operations stack in one login -- freeing budget to bolt on a dedicated procurement tool like Programa or Ivy only when FF&E volume demands it.

Why it works for interior designers:

Agiled's invoicing module connects directly to the proposal-to-project pipeline a residential designer actually runs. When a client signs a $35,000 design fee proposal for a whole-home project, the system auto-generates the project with phase-based milestones (Discovery, Concept, Design Development, Spec, Procurement, Install, Reveal) and creates the invoice schedule: $17,500 design retainer due at LOA, $8,750 at concept approval, $5,250 at design development sign-off, and $3,500 at final reveal. Each milestone invoice pulls from saved line-item templates, and expense tracking keeps pass-through costs (site-visit travel, sample library subscriptions, client lunches) separated from creative fees.

For the product side of the ledger, Agiled handles trade-vs-retail protection through line-item invoicing with custom fields per item: MSRP, trade discount percentage, net cost, markup percentage, and client price. The client sees only the retail column on their invoice; internal reports expose the full margin math per item and per project. When a designer specifies a 15-item dining room FF&E package at $22,400 client total, Agiled issues the client invoice from the retail total and exports the vendor-side data to the procurement tool or bookkeeper.

The client portal gives interior designers a branded subdomain where homeowners approve selection boards, download drawings, sign change orders, and pay milestone and product invoices in one place. The audit trail is the real value on a 12-month project: when a client approved the Roche Bobois sofa in Round 3 of selections, you have a timestamped record that eliminates "I don't remember picking that" disputes at install.

For recurring work -- retainer-based ongoing residential consulting or commercial design services -- Agiled's recurring invoicing fires automatically on the schedule you set. For hourly overage beyond a flat-fee cap, time tracked against project tasks rolls into an invoice with one click, with billable rates set per designer and per project.

Core invoicing capabilities for interior designers:

• Milestone billing with phased schedules tied to project stages (LOA retainer, concept, DD, spec, reveal)
• Deposit handling with client-deposit tracking and liability reporting
• Recurring invoicing for retainer-based clients (ongoing residential consulting, commercial design contracts)
• Line-item libraries with saved FF&E descriptions, trade/retail fields, and markup math
• Expense tracking for pass-through costs tied to specific projects and phases
• Online payments via Stripe and PayPal with automated reconciliation
• QuickBooks and Xero sync for accounting handoff
• Proposals and contracts with e-signature and versioned audit trail (Premium plan)
• Branded client portal with per-client subdomain, invoice viewing, and payment collection
• Multi-currency invoicing for international clients and vendors
• Late-payment reminders with automated follow-up sequences
• Time tracking tied to projects, phases, and billable rates
• Workflow automation that triggers invoices on phase completion, LOA signed, or selection approval events

Pricing:

The free plan covers 2 billable clients, 100 contacts, 2 active projects, and basic invoicing for 1 user -- enough for a solo designer taking on their first 1-2 paid projects. The Pro plan at $25/month billed annually (or $29/month monthly) unlocks unlimited contacts, unlimited projects, unlimited invoices, and deal pipelines for 3 users. The Premium plan at $49/month billed annually (or $59/month monthly) adds workflow automations, proposals, contracts, and e-signatures for up to 7 users. The Business plan at $83/month billed annually adds brand customization, payroll, custom domain, and priority support for 15 users. Additional users cost $5/user/month on any plan.

The interior design stack Agiled replaces: FreshBooks Plus ($33/mo) for invoicing, DocuSign ($25/mo) or PandaDoc Essentials ($19/mo) for proposals and contracts, Toggl Starter ($10/user/mo) for time tracking, and a standalone client portal tool ($30-50/mo). That is roughly $90-$115/month versus $49/month on Agiled Premium (annual) for a solo designer, saving approximately $492-$792/year. For a 3-person studio, the delta scales: Agiled Premium covers 7 users at $49/month while equivalent stacked tooling ranges from $200-$300/month for 3 seats.

Best for: Solo residential interior designers, boutique studios (1-7 people), and commercial design firms running a workflow-first practice who want one platform for retainers, milestone invoices, client portals, time tracking, and proposals -- with the flexibility to pair Agiled with Programa, Ivy, or Studio Designer when FF&E procurement volume crosses 150+ line items per project.

Tradeoff: Agiled is a horizontal business-operations platform, not a vertical procurement engine. Native spec-sheet libraries, vendor catalog clippers, and automated trade-pricing math on every line item live in Studio Designer, Design Manager, Programa, and Houzz Pro. Interior design firms shipping 200+ FF&E line items per project will pair Agiled (for CRM, proposals, contracts, milestone invoicing, client portal) with a dedicated procurement tool for the spec-to-PO layer. The tradeoff favors Agiled for firms under that threshold: one login, one subscription, one source of truth for the business-ops layer, and optional specialty tools added only when procurement volume earns their cost.

Start Free With Agiled

2. Studio Designer: Best for Established Firms With Heavy Procurement Volume

Studio Designer is the long-running standard for established residential design firms, particularly those running bookkeepers and handling 30+ specs per project. The platform splits into two connected sides: Design (specs, proposals, POs, client invoices, product library) and Accounting (accounts payable, accounts receivable, general ledger, retainer liability tracking).

Why it works for interior designers:

Studio Designer's invoicing rigor is the draw. Every item on a spec sheet carries MSRP, trade discount, net cost, markup, and client price as discrete fields. When you move a spec to procurement, Studio generates the PO to the vendor at trade pricing and the client invoice at retail with one action. The Accounting side treats retainers as liabilities (not revenue) until earned, handles state sales tax on product lines, and records every item as a real ledger entry. Your bookkeeper does not rebuild the books from CSV exports at year-end.

For firms managing designer teams (principal, 2-4 designers, admin, bookkeeper), Studio Designer's seat model and permission structure map cleanly to how design firms actually delegate invoicing and procurement work.

Key invoicing capabilities:

• Full spec sheet and proposal builder with client-approved pricing
• Vendor POs generated from approved specs at trade pricing
• Client invoices at retail with per-item markup
• Integrated double-entry accounting (AP, AR, GL)
• Retainer liability tracking until earned
• Freight and sales tax handled as separate pass-through lines
• Client portal with invoice approvals and online payments
• Reporting: open POs, client balances, project profitability, designer utilization

Pricing: Essentials at $72/user/month, Enterprise at $84/user/month, Premier at $109/user/month (billed annually). CPA and bookkeeper users eligible for a 50% user discount through the Financial Consultant Partner program. No self-serve trial -- demo required before onboarding.

Best for: Established residential design firms with 3-20 people, a dedicated bookkeeper or CFO, and $500K+ in annual product procurement volume.

Tradeoff: UI is dated relative to Programa or Houzz Pro. Onboarding takes 2-4 weeks including training. Small studios often find Studio Designer heavier than their workflow requires. No free trial means you commit after a demo. At $72/user/month minimum, a 5-person firm pays $360/month before bookkeeper seats -- well above the price point of an all-in-one like Agiled paired with a lighter procurement tool.

3. Design Manager: Best for Firms Running Full Accounting Alongside Design Ops

Design Manager has served interior designers since 1984 and is still the closest thing to "QuickBooks for designers" -- an accounting system first and a design ops platform second. Unlike generic invoicing tools with accounting bolted on, Design Manager was built around the financial plumbing that mixed-scope residential firms need.

Why it works for interior designers:

Design Manager handles the deep accounting that trade-markup, retainer-heavy firms actually need: retainers held as liabilities until earned, product sales taxed correctly by state, freight and sales tax reconciled per item, and designer time billed at cost. If your CPA has ever told you your books are a mess because retainers were booked as revenue prematurely, Design Manager solves that at the data layer. The invoicing module covers specs, POs, client proposals, and item-level invoicing with markup on every line.

Key invoicing capabilities:

• Full double-entry accounting (GL, AP, AR, bank reconciliation)
• Retainer management with liability tracking until earned per project
• Spec sheets, POs, client proposals, and invoices
• Sales tax by state with automated reporting and filing
• Project profitability and designer utilization reports
• Freight and receiving fee tracking as pass-through lines
• Desktop (Pro Cloud) and web versions
• Showroom and data collection modules available as add-ons

Pricing: $79/user/month, with additional users billed at $74/user/month. Teams larger than 10 users contact the sales team directly. 7-day free trial with full feature access. Annual billing discount available.

Best for: Mid-sized residential or hospitality design firms (5-30 people) where real accounting is non-negotiable and the CFO or bookkeeper has veto power on software choice.

Tradeoff: Presentation layer is the weakest of the design-specific tools. Mood boards and the client portal feel utilitarian. If your sales motion depends on polished concept packages that justify premium fees, you will pair Design Manager with a presentation tool like Programa or Canva. Reporting is limited and workflow customization is tighter than modern platforms -- you fit the firm to Design Manager, not the other way around.

4. Houzz Pro: Best for Residential Designers Sourcing Through Houzz

Houzz Pro is the business-ops platform built for residential designers and design-build firms. It absorbed Ivy (the popular designer platform) in 2018 and now combines Ivy's product clipper, spec sheets, and client billing with Houzz's marketplace lead-gen engine.

Why it works for interior designers:

The Houzz Pro product clipper is the time-saver. Browse any vendor site (Perigold, RH, Arhaus, Etsy, 1stDibs), click the clipper, and the item drops into your product library with price, image, dimensions, and source URL pre-filled. From there you build a tearsheet, share it with the client through the portal, capture approvals in-line, and generate a client invoice (with your markup) plus a vendor PO (at trade pricing) in one action. For client invoicing, Houzz Pro tracks deposit, milestone, and final payments per project, with online payments flowing back into project reporting.

For lead gen, Houzz Pro integrates with the Houzz marketplace, delivering homeowner inquiries directly into your CRM and billing pipeline.

Key invoicing capabilities:

• Product clipper from any vendor website with one click
• Client invoicing with per-item markup (MSRP vs. cost vs. client price)
• Vendor POs with trade pricing visibility
• Milestone invoicing with deposit handling
• Client portal with approvals, messages, and payments
• Estimate builder that converts to client invoice
• Time tracking and expense logging per project
• Change order management with client e-sign

Pricing: Essential plan at $149/month (designer-targeted) with additional users at $60/month each. Pro plan at $249/month (contractor-targeted). Custom plan requires sales contact. 30-day free trial. 12-month contractual commitment applies to monthly plans -- early cancellation is difficult.

Best for: Residential interior designers sourcing broadly from online vendors, mid-market firms running 5-25 active projects, and designers who get meaningful lead volume from the Houzz marketplace.

Tradeoff: Accounting is functional but not a replacement for QuickBooks or Xero for firms doing real bookkeeping. If Houzz is not a relevant lead channel for you (commercial designers, hospitality firms, designers serving a referral-only book), you pay for marketplace infrastructure you do not use. The 12-month commitment on monthly plans is a significant commitment compared to Agiled or Programa's no-commitment pricing. The $149/month Essential tier is a meaningful jump from generic invoicing tools.

5. Programa: Best for Boutique Firms Wanting Polished Invoices

Programa put the presentation layer first. It looks and feels like a tool a modern boutique firm would want to show a client. Invoices, schedules, and proposals render with the kind of brand polish that supports premium design fees.

Why it works for interior designers:

Programa's schedules -- the design term for structured lists of items in a room (FF&E schedule, finish schedule, lighting schedule) -- are the cleanest in the industry. Drag items from the product library into a schedule, export as a client-ready PDF with your branding, and the client approves selections in-line through the Pinboards portal with timestamped confirmation per item. Those approved items then flow into client invoices at retail pricing and vendor POs at trade pricing in one action. For firms where design quality is the brand and billing documents need to match the fee, Programa closes a gap that Studio Designer and Design Manager leave open.

Key invoicing capabilities:

• Schedules (FF&E, finish, lighting) with brand-polished invoice and PO output
• Product library with browser clipper from vendor sites
• Proposals and invoices with trade vs. retail markup
• Purchase orders with trade pricing protection
• Deposit and milestone billing
• Time tracking per project and billable rates
• Client portal (Pinboards) with approvals and real-time budget visibility
• Xero and QuickBooks sync for accounting handoff
• Team collaboration on shared projects

Pricing: $59/user/month for the first 3 users, $29/user/month for the 4th seat and beyond. 20% discount with annual billing (works out to about $566/user/year for the first 3 users). 7-day free trial.

Best for: Boutique residential and hospitality design firms (2-15 people) where the presentation is the product and invoices need to match the concept deliverables.

Tradeoff: Accounting is basic. Firms doing real procurement volume still need QuickBooks or Xero alongside for bank reconciliation, 1099 management, and multi-state sales tax. US sales tax handling is lighter than Design Manager. No permanent free plan limits accessibility for solo designers just starting out.

6. Mydoma Studio: Best for Small Studios Mixing E-Design and Full-Service

Mydoma Studio was built by and for small design studios, especially those doing e-design packages alongside full-service residential. It balances the design-specific invoicing features (specs, mood boards, product library, markup) with a simple, non-accounting-heavy setup.

Why it works for interior designers:

Mydoma packages work like design deliverables, not sales deals. You create an e-design package ("Full Room E-Design -- $799"), the client books it from your site, Mydoma collects payment, and a project is auto-created with templated phases and milestone invoicing. For full-service residential work, the same platform handles mood boards, product clipping, client invoicing with markup, and simple client portal approvals.

For solo designers or 2-3 person teams, Mydoma is light enough that the owner can run it without a bookkeeper. QuickBooks integration handles the accounting handoff when the time comes.

Key invoicing capabilities:

• E-design package builder with booking and payment collection
• Product library with vendor clipper and markup fields
• Milestone invoicing for full-service projects
• Client invoicing with trade and retail pricing
• Client portal for approvals and payments
• Template library for recurring project types
• QuickBooks sync
• Optional Mydoma Visualizer add-on ($30/mo) for room renderings

Pricing: Starter at $49/user/month, Professional at $69/user/month, Professional Team at $99/month for 3 users. Enterprise plan with custom pricing. 10% discount on annual plans. Free trial available.

Best for: Solo designers and small studios (1-5 people) mixing e-design and full-service residential work.

Tradeoff: Not the right fit for firms with heavy custom procurement, strict accounting needs, or enterprise volume. Reporting is lighter than Studio Designer or Design Manager. Per-user pricing scales quickly for teams larger than 3.

7. Ivy (by Houzz): Best Procurement-First Invoicing for Solo Designers

Ivy is the original procurement software Houzz acquired in 2018 and still maintains as a streamlined, procurement-first product separate from the broader Houzz Pro platform. Ivy is tuned for solo designers and 2-5 person studios that want specialty invoicing with trade-pricing logic without the full Houzz Pro surface.

Key invoicing capabilities:

• Product clipper and tearsheet generation
• Proposals, purchase orders, and client invoicing
• Trade vs. retail markup protection
• Time billing and expense tracking
• Retainer and milestone payment handling
• Client portal for proposal and invoice approvals
• QuickBooks sync
• Freight and sales tax pass-through

Pricing: Starts around $45/month flat for the Essential plan, with higher tiers for multi-user studios.

Best for: Solo residential designers and small studios who want procurement-first invoicing with a cleaner UI than Studio Designer or Design Manager, at a lower price than Houzz Pro Essential.

Tradeoff: Feature development has slowed as Houzz focuses on the broader Houzz Pro platform. Not ideal if you expect aggressive new-feature velocity. Limited to residential workflows.

8. HoneyBook: Best for Solo Designers Selling Fixed-Fee Packages

HoneyBook is the client-management platform favored by solo interior designers, brand designers, and creative freelancers who sell packaged services. The "smart file" system combines a proposal, contract, and invoice into a single document the client interacts with once.

Key invoicing capabilities:

• Smart files combining proposals, contracts, and invoices in one branded document
• Package-based pricing templates
• Automated payment schedules (deposits, milestones, final payments)
• Workflow automations for lead-to-invoice flow
• Online payments at 2.9% + $0.25 per credit card, 1.5% for ACH
• Client portal with project-specific status and file sharing
• Mobile app for on-the-go invoicing

Pricing: Starter at $29/month (annual) or $36/month (monthly), Essentials at $49/month (annual) or $59/month (monthly), Premium at $109/month (annual) or $129/month (monthly). Starter caps at 3 active projects and 1 team member. 7-day free trial. 60-day money-back guarantee.

Best for: Solo interior designers, e-design-focused practices, and small studios running 8-15 fixed-fee projects per year where a polished client experience matters more than procurement features.

Tradeoff: No trade-pricing logic, no vendor POs, no retainer liability tracking. Not suitable for interior designers with heavy procurement or multi-designer team coordination. HoneyBook raised prices across every plan in February 2025 -- Starter went from $19 to $36/month (89% increase), pushing most working designers to Essentials at $49-$59/month. No native time tracking means hourly work needs a separate timer. For a designer billing $100K/year through HoneyBook, credit card payment processing fees add roughly $2,925 on top of subscription.

9. FreshBooks: Best for Hourly Interior Design Consulting

FreshBooks built its reputation on invoices that look professional and take under 60 seconds to create. For interior designers who primarily bill hourly consulting work (space planning, color consultations, e-design short-form) without product procurement, FreshBooks delivers the fastest path from tracked time to paid invoice.

Key invoicing capabilities:

• Polished invoice templates with logo and brand customization
• Automatic time tracking that feeds directly into invoices
• Deposit requests and partial payment support
• Automated late-payment reminders
• Expense tracking with receipt capture (mobile app)
• Recurring invoices for retainer clients
• Multi-currency invoicing (Plus plan and above)
• Client portal for invoice viewing and online payment

Pricing: Lite at $19/month (5 billable clients), Plus at $33/month (50 clients), Premium at $60/month (unlimited clients). Annual billing saves 10%. Additional team members cost $11/month each. 30-day free trial.

Best for: Solo interior design consultants billing primarily hourly for space planning, styling, or short-form e-design work, with minimal product procurement.

Tradeoff: No trade markup, no vendor POs, no retainer liability tracking, no project phase-based billing. FreshBooks is invoicing with accounting bolted on; interior designers with procurement will quickly outgrow the feature set. The Lite plan's 5-client cap is restrictive for active designers. Multi-currency invoicing requires the Plus plan minimum.

10. Xero: Best for Designers Needing Full Accounting With Invoicing

Xero is accounting software with strong invoicing built in. For interior designers who have outgrown basic invoicing and need bank reconciliation, sales-tax-compliant product invoicing, multi-currency accounting, and 1099 management alongside their client billing, Xero handles both without requiring a separate accounting tool.

Key invoicing capabilities:

• Unlimited invoices and bills (Growing plan and above)
• Quotes that convert to invoices with one click
• Multi-currency invoicing and accounting (Growing plan and above)
• Bank reconciliation with automatic transaction import
• Tracked inventory with cost and sale prices (Growing plan and above) -- can model trade vs. retail
• Project tracking with time and costs (Growing plan and above)
• Hubdoc for receipt and bill capture (included in all plans)
• Unlimited users on all plans (no per-seat pricing)
• 1099 and W-9 management for US designers
• 800+ integrations including Stripe, PayPal, GoCardless, and specialty design tools

Pricing: Early at $25/month (20 invoices/month, 5 bills), Growing at $55/month (unlimited invoices, multi-currency, project tracking), Established at $90/month (analytics, batch payments). 30-day free trial. Promotional pricing (up to 85% off for first 6 months) frequently available.

Best for: Established interior design studios billing $250K+ annually who need proper double-entry accounting alongside invoicing, and firms running international vendors or international client engagements.

Tradeoff: Xero is accounting software, not design business management software. No proposals, no contracts, no client portal for deliverable approvals, no native project phase templates. Firms pair Xero with a design-vertical tool (Programa, Mydoma) or with Agiled for the client-facing workflow layer. The Early plan caps at 20 invoices per month, which an active interior designer can exceed within a single month of heavy procurement. The jump from Early ($25/mo) to Growing ($55/mo) more than doubles the cost.

11. QuickBooks Online: Best When Your CPA Requires QuickBooks

QuickBooks Online is the default accounting platform for US small businesses and the one most CPAs already know. For interior designers whose accountant has standardized on QuickBooks and will not migrate, QuickBooks Online's progress invoicing and inventory modules can be configured to handle design billing.

Key invoicing capabilities:

• Branded invoices with logo and customization
• Progress invoicing (partial billing against estimates) on Plus plan and above
• Inventory tracking with cost and sales price (Plus plan and above) -- supports trade vs. retail modeling
• Automatic bank transaction download and categorization
• Recurring invoices and auto-billing
• Sales tax calculation and reporting
• Online payments via QuickBooks Payments
• Class and location tracking for multi-project reporting (Plus plan and above)
• 1099 contractor management for US designers

Pricing: Simple Start at $35/month, Essentials at $65/month, Plus at $99/month, Advanced at $235/month (post-introductory rates). 30-day free trial. Promotional pricing (50% off for 3 months) frequently available.

Best for: US-based interior design firms whose CPA has standardized on QuickBooks, firms with W-2 employees where payroll integration matters, and multi-entity studios that need class-based project reporting.

Tradeoff: QuickBooks Online is accounting, not design software. No proposals, no contracts, no client portal for selection approvals, no native retainer liability tracking per project (requires manual journal entries). Progress invoicing is on the Plus plan minimum ($99/month). The interface prioritizes accountants over creative professionals. Most interior designers on QuickBooks still pair it with a design-vertical tool (Studio Designer, Design Manager, Programa) or an all-in-one (Agiled) for the client-facing workflow layer.

12. Wave: Best Free Invoicing for Solo E-Designers

Wave offers genuinely free invoicing with no client limits, no invoice caps, and no time-gating. For interior designers in their first year, side-project designers, or e-design-only practices with flat-fee packages and no procurement, Wave removes the financial barrier.

Key invoicing capabilities:

• Unlimited invoices and estimates at $0/month (Starter plan)
• Customizable invoice templates with logo and branding
• Automated payment reminders
• Recurring invoices for retainer clients
• Expense tracking and receipt scanning
• Basic financial reports (profit and loss, sales tax)
• Online payments via credit card and bank transfer (ACH)

Pricing: Starter plan is free forever. Pro plan at $16/month (monthly) or approximately $14/month billed annually adds automation features, unlimited receipt capture, and bank reconciliation. Online payment processing: credit cards at 2.9% + $0.60 per transaction, bank payments (ACH) at 1% ($1 minimum).

Best for: New interior designers, side-hustle e-designers, and budget-conscious solo practitioners who need professional invoicing without a subscription and have no procurement billing needs.

Tradeoff: Wave has no trade markup, no vendor POs, no retainer liability tracking, no milestone billing automation, no time tracking, no proposals, no contracts, and no client portal for deliverable approvals. Credit card processing fees (2.9% + $0.60) are higher per transaction than Stripe's standard 2.9% + $0.30. Wave's payroll and some advanced features are limited to US and Canada. As your practice grows past 5-8 active clients, Wave stops scaling and migration to Agiled or a design-vertical tool becomes inevitable.

Original Research: Trade Markup Dollar Math on a $120K Residential Project

We modeled the realistic invoicing workload and margin-leak difference between invoicing-only software and procurement-native platforms on a typical $120,000 residential project. The scenario: full-service residential, $20,000 design fee across 4 phases + $100,000 in procured product across 85 line items from 18 vendors.

Assumptions: Average item MSRP of $1,176. Average trade discount of 25% off MSRP (designer net cost $75,000). Average client markup of 15% on net cost (client product total $86,250). Designer gross margin on product = $11,250 plus the $20,000 design fee. Total invoicing workload: 1 design retainer + 3 milestone invoices + 14 product invoices (room-by-room) + 1 final reconciliation = 19 client invoices, plus 18 vendor POs.

The delta matters on margin and on time. On a single $120K project, a procurement-native platform saves roughly $700-$1,600 in margin leak compared to a manual-markup workflow. Time per PO-plus-invoice pair falls from 22-24 minutes to 7-8 minutes. Run 8 residential projects per year and the annual difference compounds to roughly $5,600-$12,800 in recovered margin and about 72 hours of admin time -- more than the annual cost of any tool on this list.

For smaller firms or firms with lighter procurement (under 80 line items per project, under 5 vendors per project), an all-in-one platform like Agiled with markup handled through custom fields and proposal line-item templates approximates the vertical tools at 6-10% margin-leak performance, with the tradeoff of manual per-line entry versus automated product clipper workflows. For heavy procurement, the vertical tools earn their price through reduced margin leak alone.

Retainer Liability: Why Most Invoicing Tools Get This Wrong for Interior Designers

A detail most invoicing comparison articles skip entirely: a design retainer is not revenue the day it hits your bank account. It is a liability -- money the client has paid in advance for work not yet performed. Proper accrual accounting holds the retainer on the balance sheet as "Client Deposits" (a liability) and transfers it to revenue in phases as work is completed. Tools that book the full retainer as income on deposit day overstate monthly revenue, cause reconciliation headaches at year-end, and create tax-timing mismatches that a CPA will eventually force you to unwind.

Here is how the major platforms handle retainers:

• Studio Designer and Design Manager: Native retainer liability tracking per project. Retainer sits as a client-deposit balance and moves to revenue as phase invoices are issued against it. Proper accrual accounting out of the box.
• QuickBooks Online: Retainers can be booked to a liability account with manual journal entries or custom setup. Native UI treats invoice payments as revenue; you or your bookkeeper configures the liability workflow.
• Xero: Similar to QuickBooks -- retainers can be handled via a liability account with manual configuration or an add-on.
• Agiled, Houzz Pro, Programa, Mydoma, Ivy: Treat retainers as project-level deposits that offset milestone invoices. Better than cash-basis invoicing-only tools but typically require a QuickBooks/Xero sync to carry the liability treatment all the way to the balance sheet.
• FreshBooks, Wave, HoneyBook: Cash-basis by default. Retainers land as income when received. Acceptable for sole proprietors filing Schedule C on cash basis; problematic for LLCs or S-corps on accrual basis.

The practical rule: If your revenue crosses $100K annually or your CPA files your taxes on accrual basis, the retainer-as-liability treatment is non-negotiable. Choose Studio Designer, Design Manager, Agiled+QuickBooks, or Programa+Xero. If you are a solo designer on cash basis under $100K, the simpler tools work until your accountant tells you to upgrade.

Annual Cost Comparison: Solo Interior Designer Invoicing Stack

We modeled what a solo interior designer actually pays per year across the five most common invoicing stacks, including the hidden cost of tools you bolt on when the invoicing platform does not include them natively. The assumption is a working solo residential designer running 4-8 full-service projects per year with procurement.

Assumptions: 1 seat, annual billing where available. Supplemental tool costs when needed: QuickBooks Online Simple Start ($35/mo = $420/yr), proposals and contracts via PandaDoc Essentials ($19/mo = $228/yr), time tracking via Toggl Starter ($10/mo = $120/yr), client portal via a basic portal tool ($35/mo = $420/yr).

The cheapest real option for a solo interior designer with procurement needs is Agiled Premium at $588/year standalone, or Agiled Premium paired with Ivy at $1,128/year for firms needing native procurement. Design-vertical tools earn their price (Studio Designer at $864/year, Design Manager at $948/year) because accounting is built in -- no QuickBooks or portal add-on needed. The middle-ground stacks (FreshBooks, HoneyBook, Wave) become the most expensive path once the supplemental tools required to fill their gaps are counted. "Free invoicing" is rarely the cheapest stack at a full-stack designer level.

When Standalone Invoicing Software Is the Wrong Choice for Interior Designers

Invoicing software works when invoicing is your bottleneck. For many interior designers, the real bottleneck is somewhere else:

• You have no procurement billing -- only design fees. If clients buy all product directly through their own accounts (a common e-design model), you do not need trade-pricing logic, vendor POs, or markup fields. FreshBooks, HoneyBook, or Agiled handles flat-fee design billing cleanly without procurement machinery.
• You spend more time chasing unsigned contracts than issuing invoices. If the gap between "let's proceed" and a signed LOA is where projects stall, you need a contracts and proposals tool more than a dedicated invoicing platform. HoneyBook, Dubsado, Agiled, and Programa close the lead-to-signed-LOA gap. FreshBooks and Wave do not.
• You need full accounting, not invoicing. QuickBooks, Xero, and Design Manager are accounting platforms that include invoicing. If your CPA has asked for a general ledger, balance sheet, or proper retainer liability tracking, you have outgrown invoicing software.
• Your real problem is scope creep, not billing. No invoicing tool fixes a project where the client requested "one more revision" five times. If your effective hourly rate on "fee plus" work drops below $60 consistently, the fix is a better contract with defined revision limits and change-order pricing -- not a better invoice template.
• You are an established firm doing $1M+ in annual procurement. At this level, you need ERP-adjacent tools with multi-project portfolio reporting, resource forecasting, and vendor relationship management. Studio Designer Premier, Design Manager with the Showroom module, or a custom Xero + specialty stack becomes the right move.

Matching Invoicing Software to Your Interior Design Billing Model

Your billing model should drive the tool choice more than any feature list.

Flat design fee + product markup (most common residential model): Studio Designer, Design Manager, Houzz Pro, Programa, Mydoma, or Ivy because per-item markup logic is the daily workflow. Agiled with line-item custom fields works for firms under ~80 items per project.

Flat design fee only, no product billed through studio: Agiled, HoneyBook, or Dubsado handle the LOA-to-final-invoice workflow without needing spec/PO machinery. FreshBooks covers the hourly-heavy end of the same spectrum.

Hourly design + product markup: Agiled, Houzz Pro, Studio Designer, or Programa because time tracking and per-item markup must coexist at the project level.

Cost-plus procurement (no flat design fee, percentage-based billing on product total): Studio Designer or Design Manager because every item's cost and markup must be auditable for the bookkeeper and transparent to the client if disputes arise.

E-design packages (fixed deliverables, no procurement): Mydoma, Agiled, or HoneyBook because the deliverable-packaging-to-payment workflow is built in.

Retainer-based commercial consulting: Agiled (recurring invoices), FreshBooks (recurring invoices), or Xero (recurring invoices + accounting) because the monthly billing cadence matters more than procurement features.

Frequently Asked Questions

What is the best invoicing software for interior designers?

For most boutique and solo interior designers, Agiled offers the best all-around value because it combines invoicing, milestone billing, deposits, proposals, contracts, time tracking, and a branded client portal starting free. For established firms with heavy procurement volume (200+ FF&E items per project, 15+ vendors), Studio Designer ($72-$109/user/mo) and Design Manager ($79/user/mo) are the category specialists worth their price because of native trade-markup fields and retainer liability tracking. For residential designers getting leads from Houzz, Houzz Pro Essential ($149/mo) bundles procurement with marketplace leads. Programa ($59/user/mo) is the best modern pick for boutique firms prioritizing polished invoice and proposal design.

How do interior designers invoice clients?

Interior designers typically invoice clients on three billing tracks: (1) a design fee split across milestones (50% LOA retainer, 25% concept approval, 15% design development sign-off, 10% final reveal), (2) product invoices issued room-by-room after client approval of selections, with each line priced at retail (trade cost plus markup), and (3) reimbursable expenses for site visits, travel, and pass-through costs billed separately. Best practice is to hold design retainers as a liability on the balance sheet until earned, separate trade cost from client price on every product line, and reconcile vendor POs against client invoices at project close. Most professional designers invoice through specialty software (Studio Designer, Design Manager, Houzz Pro, Programa) or an all-in-one (Agiled) rather than raw PDFs.

What is the difference between invoicing software and interior design procurement software?

Invoicing software (FreshBooks, Wave, HoneyBook, QuickBooks) generates client invoices and collects payments but does not handle trade pricing, vendor POs, or markup math. Interior design procurement software (Studio Designer, Design Manager, Houzz Pro, Programa, Ivy) adds a product library with vendor catalogs, trade discount fields, client markup fields, vendor PO generation, and proposal-to-invoice flow. Most interior designers need both layers -- either combined in a specialty platform or split between an all-in-one like Agiled and a procurement tool like Programa or Ivy. Generic invoicing software is fine for design fees alone but cannot handle product billing without manual workarounds.

How should interior designers handle trade pricing on invoices?

Interior designers should never show trade cost on a client invoice. Every specified product carries two prices internally: trade (what the designer pays the vendor after the designer discount) and retail (what the client pays, equal to trade cost plus markup). Client-facing invoices and proposals display only the retail price per line item; vendor purchase orders display only the trade price. Specialty platforms (Studio Designer, Design Manager, Houzz Pro, Programa, Mydoma, Ivy) store both prices on the same product record and generate client and vendor documents from the correct column automatically. Generic invoicing tools (FreshBooks, Wave) require manual separation through spreadsheets, which is error-prone on long projects with 100+ line items.

Can interior designers use QuickBooks for invoicing?

Yes, with setup work. QuickBooks Online Plus ($99/mo) supports progress invoicing (partial billing against estimates), tracked inventory (for trade vs. retail modeling), and class-based project reporting. The workflow requires either manual journal entries for retainer liability treatment or an integration with a specialty tool that syncs to QuickBooks. Most interior designers on QuickBooks pair it with a design-vertical tool (Studio Designer syncs, Programa syncs, Ivy syncs) or with an all-in-one platform like Agiled that handles the client-facing invoicing and pushes final transactions to QuickBooks for accounting. QuickBooks alone is rarely sufficient for a procurement-heavy design firm because it lacks spec sheets, vendor catalog management, and client-approval workflows.

How much should interior designers spend on invoicing software?

A common benchmark is 0.5-1.5% of studio annual revenue on invoicing and billing tools specifically, and 1-2% on core ops software overall (CRM + PM + invoicing + proposals + specs). A $250K solo design studio can justify $1,250-$3,750/year on the billing layer. All-in-one platforms like Agiled Premium deliver full business-ops coverage for $588/year. Design-vertical platforms (Studio Designer, Design Manager, Programa) cost $566-$1,308/year and include accounting. Generic stacked tooling (FreshBooks + PandaDoc + Toggl + portal tool) often runs $1,400-$2,000/year for a solo designer -- more than the specialty options while offering less design-specific functionality.

Do interior designers need to charge sales tax on invoices?

Yes, in most US states where you sell or deliver tangible personal property (furniture, lighting, rugs, accessories). Sales tax rules vary by state, by whether you are the "seller of record" or a "designer-in-name-only" passing orders to a vendor, by destination vs. origin sourcing, and by whether you hold a resale certificate. Design Manager and Studio Designer both automate multi-state sales tax calculation and reporting. Agiled, FreshBooks, Xero, and QuickBooks support sales tax at the invoice level but put the configuration work on you. Consult a CPA who serves interior designers specifically -- sales tax compliance is where most design firms either overpay or create audit exposure.

The Bottom Line

For most solo and boutique interior designers, Agiled delivers the best value because it replaces 4-5 separate tools (invoicing, proposals, contracts, time tracking, client portal) with one platform starting at $0/month -- leaving budget to bolt on a dedicated procurement tool like Programa or Ivy when FF&E volume justifies it. For established firms running 15+ active projects with $500K+ in annual procurement, Studio Designer and Design Manager remain the category leaders because native trade-markup fields, retainer liability tracking, and full accounting ledgers are worth their $864-$1,308/year per-seat cost. For residential designers getting leads from Houzz, Houzz Pro Essential at $149/month bundles procurement with marketplace lead flow. For solo designers wanting a modern boutique UI with procurement baked in, Programa at $566/year (annual billing) is the strongest 2026 pick.

The best invoicing tool is the one your studio actually uses on Monday morning to issue a retainer invoice and on Friday afternoon to reconcile a vendor PO. Start with a free plan or trial, move one in-progress project's billing into the new system, run a real milestone invoice plus a real vendor PO through it, and evaluate after 30 days. If retainers sit correctly on the balance sheet, if trade cost stays off client invoices, if vendor POs reconcile to client invoices at project close, and if your CPA can run a P&L without re-keying numbers, the tool is earning its price.

The other number worth watching: trade margin leak. Procurement-native platforms recover $5,600-$12,800 per year in margin on a typical 8-project residential book compared to spreadsheet-based markup handling. That alone pays for any tool on this list.

Get Started With Agiled Free

Related Articles:

• Best CRM for Interior Designers
• Best Project Management Software for Interior Designers
• Best Invoicing Software for Designers
• Best Invoicing Software for Freelancers
• Best Tools for Interior Designers
• Best Business Management Software