# Architecture, Interior Design & CAD Freelancer 1099 Taxes: Schedule C, FF&E Markups & Phase Invoice Guide (2026)

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- **Summary:** Architect, interior designer, and CAD freelancer 1099 taxes (2026): IRS Schedule C NAICS 541310/541410, FF&E markup vs pass-through, $2,500 gear & $0 invoice.

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# Architecture, Interior Design & CAD Freelancer 1099 Taxes: Schedule C, FF&E Markups & Phase Invoice Guide (2026)

**Short answer: Under 2026 interior designer 1099 taxes rules, independent US interior designers, residential architects, kitchen/bath designers, and freelance CAD/BIM drafters report design fees, phase retainers, and FF&E purchasing markups on IRS Schedule C (NAICS 541410 or 541310). You can deduct 100% of AutoCAD, Revit, SketchUp, Chief Architect, and Adobe subscriptions on Line 18, iPad Pro and Leica laser measurers up to $2,500 per item under Reg. §1.263(a)-1(f), sample library costs on Line 22, and 72.5¢–76¢/mi site-visit mileage on Line 9.**

> **⚡ Instant 2026 Architect, Interior Designer & CAD Freelancer Phase Invoice + Schedule C Calculator (`$USD · 100% Free Unlimited iPhone App`):** Every **`$1,000`** in unlogged AutoCAD/Revit subscriptions, fabric/stone sample shipping, plotting prints, iPad Pro hardware, or `72.5¢/76¢` jobsite measurement miles costs an independent designer or drafter **`$273 to $373 in avoidable IRS income tax and 15.3% Self-Employment tax`**. Built for **anyone who invoices** (interior designers, solo architects, CAD/Revit drafters, kitchen & bath designers, 3D rendering artists, and design-build consultants): calculate your 2026 tax set-aside or build an itemized phase/FF&E invoice in the interactive **1099 Tax & USD Invoice Calculator** below (or click **🔗 Embed / CSV Template**), email **mert@usekeelapp.com** for **Free `.keel` Data Setup** (or open the **[Free Invoice & Tax Generator](/keel/invoice-generator/)**), explore the **[Consultant & Creative Freelancer Edition](/keel/cpp/consultants-and-freelancers/)**, **[US 1099 Schedule C Edition](/keel/cpp/us-tax-schedule-c/)**, or **[Quotes & Estimates Edition](/keel/cpp/estimates-quotes-to-invoice/)**, or **[Download Keel Free on the App Store (`$0/mo` Forever · 100% Free Unlimited on iPhone · Zero Bank Login)](https://apps.apple.com/us/app/keel-invoice-maker-receipts/id6786659713?ppid=3517a7a6-1a60-4d96-9c12-1ba018a8832c&pt=127772795&ct=blog_vergi_us-interior-designer-tax&mt=8)** (`consultant` — keep using the web tool anytime, or send phase invoices and snap showroom receipts offline on iPhone).

More than 420,000 solo interior designers, residential architects, freelance CAD/Revit drafters, and 3D visualization specialists operate as independent 1099 businesses across the United States. Unlike general freelancers who bill flat hourly work, design professionals manage **multi-month phase billing** (`Schematic Design → Design Development → Construction Documents → Procurement & Site Observation`), **reimbursable permit/plotting outlays**, and **Furniture, Fixtures & Equipment (`FF&E`) trade-discount markups**.

If your invoice structure blurs the line between **design services** and **resold FF&E merchandise**, you can accidentally trigger state retail sales tax audits and inflate your [IRS Schedule C gross receipts](/keel/schedule-c-explained/). Here is the official 2026 IRS and state tax playbook for solo architects, interior designers, and CAD freelancers.

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## How do interior designers, solo architects, and CAD freelancers report 1099 income on Schedule C in 2026?

Whether you work as a freelance Revit/AutoCAD drafter for architecture firms (receiving **Form 1099-NEC** for payments of **`$2,000 or more` in 2026** under `IRC §6041A`) or bill residential homeowners directly via check, ACH, and Stripe, the [Internal Revenue Service (IRS)](https://www.irs.gov/businesses/small-businesses-self-employed/self-employed-individuals-tax-center) taxes your net profit (`Schedule C Line 31`) under two rules:

1. **15.3% Self-Employment (`SE`) Tax (`Schedule SE`):** Applied to **`92.35%` of your Schedule C Line 31 net profit** (`12.4%` Social Security on the first `$176,100+` of net earnings plus `2.9%` Medicare on all net earnings, for an effective **`14.13%`** SE tax rate). You deduct `50%` of your SE tax above the line on Form 1040 Schedule 1 Line 15.
2. **20% QBI Deduction (`IRC §199A`) for Architects, Interior Designers & Drafters:** While many high-earning consulting fields face the *Specified Service Trade or Business (`SSTB`)* phase-out at higher incomes, **IRC §199A(d)(2)(B) explicitly exempts architecture and engineering** from the SSTB limitation, and solo interior designers and CAD drafters below the `$197,300` single / `$394,600` married taxable-income threshold qualify for the full **`20%` Qualified Business Income (`QBI`) deduction** on Form 8995.

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## How should interior designers and architects invoice FF&E trade markups vs. reimbursable expenses?

How you structure Furniture, Fixtures & Equipment (`FF&E`) procurement and client reimbursables on your [design invoice](/keel/invoice-generator/) determines both your **Schedule C accounting** and your **state sales tax liability**:

| Billing Method | How It Appears on Your Invoice | IRS Schedule C Treatment | State Sales Tax Rule (Most US States) |
|---|---|---|---|
| **1. Pure Design Fee + Client Direct Purchase (`Agency Pass-Through`)** | Client pays the vendor directly (or you share a trade payment link); you invoice **`$3,500 Schematic & FF&E Specification Fee`** + **`15% Procurement Management Fee ($900)`** | Report **`$4,400`** on **Schedule C Line 1**. Because you never took title to the furniture, you have zero Cost of Goods Sold (`Part III`) | Pure interior design consultation and CAD drafting without transferring tangible merchandise is **exempt from sales tax** in most states (e.g., CA, TX, FL, IL, NY NYC local rules apply to interior decorating) |
| **2. Trade-Discount Resale (`Designer Buys Wholesale & Resells with 20%–35% Markup`)** | You buy a sofa at trade wholesale (`$4,000` using a State Resale Certificate) and invoice the client **`$5,200 Custom Sofa + $429 Sales Tax`** | Report **`$5,200`** gross sales on **Schedule C Line 1** and deduct the **`$4,000`** wholesale purchase + freight in **Schedule C Part III (`Line 4 Cost of Goods Sold`)** | You are acting as a **retailer of tangible personal property**: you must register for a state Sales & Use Tax Permit, issue a resale certificate to the trade showroom, and collect state/local sales tax from the client |
| **3. Reimbursable Project Outlays (`Blueprints, Plotting, Courier, Permit Filing Fees`)** | Itemized separately at the bottom of your invoice: **`Reimbursable City Permit & Arch-D Blueprint Plotting (Receipts Attached): $385.00`** | Include the `$385.00` reimbursement in **Schedule C Line 1** and deduct the exact `$385.00` receipt on **Line 22 (`Supplies`) or Line 27a** (`$0` net tax impact) | Exact at-cost government permit fee pass-throughs itemized separately on the invoice are non-taxable when backed by receipts |

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## Which Schedule C tax deductions save the most money for architects, interior designers, and CAD drafters?

On [Schedule C (Form 1040)](/keel/schedule-c-line-items-explained/), residential architects use **NAICS Code `541310`**, landscape architects use **`541320`**, interior designers use **`541410`**, and independent CAD/BIM drafting technicians use **`541340`**. Every `$1,000` of documented business deductions saves **`$273 to $373`** in combined federal and SE taxes:

| Deduction Category | Schedule C Line | 2026 IRS Rule & Audit Boundary (`IRC §162` & `Reg. §1.263(a)-1(f)`) | Annual Tax Value (Typical Solo Studio) |
|---|---|---|---|
| **CAD, BIM, 3D Rendering & Specification Software** | **Line 18 (`Office expense`) or Line 27a** | `100%` deductible: AutoCAD, Revit, Archicad, Chief Architect, SketchUp Studio, Enscape, V-Ray, Bluebeam Revu, Programa/Studio Designer, Morpholio Trace, and Adobe Creative Cloud | **`$2,400 – $5,800/yr` (`$760–$2,100` tax saved)** |
| **iPad Pro, Apple Pencil, Laser Measurer, Calibrated Monitor & Plotter (`<= $2,500/item`)** | **Line 22 (`Supplies`) or Line 27a (`De Minimis Safe Harbor`)** | Under **Treas. Reg. §1.263(a)-1(f)**, attach the annual De Minimis Safe Harbor election to write off `100%` of any hardware item costing **`$2,500 or less` per invoice item** in Year 1 | **`$1,500 – $4,500/yr` (`$475–$1,620` tax saved)** |
| **High-Spec Workstation / Mac Studio / 3D Rendering Rig (`> $2,500/item`)** | **Line 13 (`Section 179` via `Form 4562`)** | Deduct `100%` of the business-use portion in Year 1 under **IRC §179** when business use exceeds `50%` | **`$3,000 – $6,500` (`$950–$2,350` tax saved)** |
| **Material Library Samples, Swatches, 3D Printing & Arch-D Plotting** | **Line 22 (`Supplies`)** | `100%` deductible: tile/stone/fabric sample shipping, Pantone decks, foam-core presentation boards, and blueprint reprographics | **`$800 – $2,600/yr`** |
| **AIA, ASID, NCIDQ, NCARB Dues & E&O Professional Liability Insurance** | **Line 15 (`Insurance`) & Line 27a (`Professional dues`)** | `100%` deductible: Errors & Omissions (`E&O`) professional liability insurance, state architectural/interior design license renewals, CEU courses, and AIA/ASID memberships | **`$1,400 – $3,800/yr`** |
| **Freelance Renderers, Draftspeople & Structural/MEP Subconsultants** | **Line 11 (`Contract labor`)** | `100%` deductible. Issue **Form 1099-NEC** in 2026 to any unincorporated US freelancer you pay **`$2,000 or more`** during the calendar year | **Full pass-through deduction** |
| **Jobsite Visits, Design Center Trips & Showroom Mileage (`72.5¢–76¢/mi`)** | **Line 9 (`Car and truck expenses`)** | Deduct **[`72.5¢/mi` (Jan–Jun 2026) and `76¢/mi` (Jul–Dec 2026)](/keel/irs-mileage-rate-2026/)** for driving from your home studio to client properties, framing walk-throughs, tile yards, and design centers | **`$2,700 – $5,400/yr` (`3,600–7,200 miles`)** |
| **Dedicated Home Drafting Studio & Sample Library (`Line 30`)** | **Line 30 (`Business use of home`)** | Deduct `$5/sq ft` up to `300 sq ft` (**`$1,500` Simplified**) or actual percentage (`Form 8829`) of rent, mortgage interest, utilities, and studio internet for a space used **exclusively and regularly** for drafting and sample storage | **`$1,500 – $4,800/yr`** |

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## How to structure a 4-phase architecture or interior design milestone invoice so clients pay on time

Design projects stall when invoices are vague. Using the standard **4-Phase Milestone Schedule** on your [sequentially numbered invoices](/keel/us-freelancer-and-1099-consultant-retainer-deposit-invoice-and-schedule-c-p-and-l-proof-of-income-guide/) protects your cash flow and eliminates scope creep:

1. **Phase 1 — Discovery, As-Built Laser Measure & Schematic Design (`25%–30% Initial Retainer Before Work Starts`):** Covers site measurement, existing-conditions CAD floor plans, space planning options, and concept mood boards. State clearly: *`Work commences upon receipt of Phase 1 retainer.`*
2. **Phase 2 — Design Development & 3D Elevations / Selections (`30%–35% Due Upon Schematic Sign-Off`):** Covers detailed millwork elevations, lighting/electrical plans, finish schedules, and 3D renderings. Include your revision boundary: *`Includes up to 2 rounds of consolidated client revisions; additional design changes billed at $165/hr.`*
3. **Phase 3 — Construction Documents (`CD`) / Permit Set or FF&E Procurement (`25%–30% Due Before Releasing Stamp/CAD Files`):** Never release editable `.dwg` / `.rvt` files, final permit PDFs, or vendor specification sheets until Phase 3 is paid in full.
4. **Phase 4 — Permitting Responses, Procurement Tracking & Site Observation (`10%–15% + Reimbursables`):** Billed monthly or upon substantial completion, itemizing site-visit hours and attached plotting/courier receipts separately.

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## Worked example: 2026 Schedule C tax calculation for a solo interior designer & CAD consultant earning $112,000

Suppose an independent kitchen/bath interior designer and CAD consultant bills **`$112,000`** in 2026 design fees and procurement commissions (with clients purchasing FF&E directly from trade vendors):
- **Gross Receipts (`Schedule C Line 1`):** **`$112,000`**
- **Documented Schedule C Business Deductions (`$26,850` total):**
  - **Line 18 (`AutoCAD, Chief Architect, SketchUp, Enscape, Studio Designer & Cloud`):** `$3,420`
  - **Line 22 (`De Minimis <= $2,500`: iPad Pro M4 `$1,299`, Leica Disto laser measurer `$490`, sample library & plotting `$1,860`):** `$3,649`
  - **Line 11 (`Contract 3D visualization artist — 1099-NEC issued`):** `$6,400`
  - **Line 15 & 27a (`E&O Professional Liability Insurance, ASID/NKBA dues & trade show registration`):** `$2,980`
  - **Line 9 (`5,800` logged miles to client homes, stone yards & showrooms at `72.5¢/76¢`):** `$4,311`
  - **Line 30 (`240 sq ft Dedicated Home Drafting Studio & Sample Library via Form 8829`):** `$6,090`
- **Schedule C Line 31 Net Profit:** `$112,000 - $26,850` = **`$85,150`**
- **20% QBI Deduction (`IRC §199A`):** Reduces taxable federal business income by another **`$15,828`**
- **Total Tax Saved by Logging Receipts & Showroom Mileage:** Those `$26,850` in documented business expenses save **`$3,794` in 15.3% Self-Employment tax** plus **`$5,420+` in federal and state income tax** — keeping **`$9,214`** in the designer's pocket!

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## Frequently asked questions

**What NAICS code should a freelance interior designer, architect, or CAD drafter use on Schedule C?**
On IRS Schedule C Box B, licensed residential architects use **NAICS `541310`** (*Architectural Services*), landscape architects use **`541320`**, interior designers and kitchen/bath designers use **`541410`** (*Interior Design Services*), and freelance CAD, Revit, or BIM drafters use **`541340`** (*Drafting Services*). Choosing the exact NAICS code matches your software, plotting, and sample library deductions to IRS industry benchmarks.

**Do interior designers have to charge sales tax on design fees?**
In most US states (including California, Texas, Florida, Illinois, and Washington), **pure design consultation, space planning, and CAD drafting fees** are exempt from sales tax when no tangible merchandise is sold, whereas selling **furniture, lighting, cabinetry, or fabric (`FF&E`)** at a markup is taxable retail sales. However, a few jurisdictions — such as **New York City (`4.5%` local sales tax on interior decorating and design services)**, Connecticut, and states with broad gross receipts taxes like New Mexico and Hawaii — tax interior design services directly, so always separate pure architectural/structural plans from taxable merchandise or decorating lines on your invoice.

**How do I report client-reimbursed blueprint plotting, permit fees, and sample shipping on Schedule C?**
Under IRS rules, if you bill a client for reimbursable expenses (such as `$280` for city permit filing or Arch-D blueprint plotting) and the payment hits your business bank account, include the `$280` reimbursement in **Schedule C Line 1 (Gross receipts)** and deduct the matching `$280` receipt on **Line 22 (Supplies)** or **Line 27a (Other expenses)**. The two entries cancel each other out (`$0` net taxable profit) while keeping your gross bank deposits `100%` reconciled with your invoice ledger.

**Can a freelance CAD drafter or architect deduct an iPad Pro, Apple Pencil, and 3D workstation in one year?**
Yes. Under the **IRS De Minimis Safe Harbor Election (`Treas. Reg. §1.263(a)-1(f)`)**, any piece of equipment costing **`$2,500 or less` per invoice line item** (such as an iPad Pro, Apple Pencil Pro, Leica Disto laser distance meter, or calibrated 4K monitor) can be deducted `100%` in the year of purchase on Schedule C Line 22 or Line 27a. For a high-end 3D rendering workstation or Mac Studio costing **over `$2,500`**, you can deduct `100%` of the business-use percentage in Year 1 using **Section 179 (`Form 4562`)** as long as business use exceeds `50%`.

**Does driving to client homes, stone yards, and design showrooms count as deductible 72.5¢–76¢ business mileage?**
Yes. If your home studio qualifies as your **principal place of business under IRC §280A(c)(1)** (used regularly and exclusively for your administrative and drafting work), `100%` of your round-trip mileage from your home studio to client properties, framing inspections, tile/stone yards, and design centers is deductible on **Schedule C Line 9** at the 2026 IRS standard mileage rate (`72.5¢/mi` Jan–Jun; `76¢/mi` Jul–Dec).

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*Last verified November 6, 2026 against IRS Publication 334, IRS Schedule C Instructions, IRC §199A, and Treas. Reg. §1.263(a)-1(f).*