# Self Employed Architect Tax Deductions Canada: T2125 2026

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- **Jurisdiction / Region:** CA
- **Last Verified:** Sun Nov 08
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- **Summary:** Self employed architect tax deductions Canada (CRA T2125 & Québec TP-80-V): OAA/OAQ/PEO dues, E&O insurance, Class 50 CAD Macs, 73¢/km & $0 iPhone invoice app.

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# Self-Employed Architect, Interior Designer & Engineering Consultant Tax Deductions in Canada & Québec: CRA T2125, Revenu Québec TP-80-V & Milestone Invoices (2026)

**Short answer: Under CRA Form T2125 and Revenu Québec Form TP-80-V (NAICS 541310 Architecture, 541410 Interior Design, and 541330 Engineering), self employed architect tax deductions canada cover 100% of studio expenses—including OAA/OAQ/AIBC/PEO/OIQ/ARIDO dues (Line 8760), mandatory E&O liability insurance (Line 8690), AutoCAD/Revit/Archicad licences, Class 50 (55% CCA) CAD workstations, and 73¢/km site mileage—saving $32 to $48 per $100 tracked.**

> **⚡ Instant Canadian & Québec Architect, Interior Designer & Engineering Milestone Invoice + `T2125` / `TP-80-V` Toolkit (`$0/Mo` — 100% Unlimited):** Generate phased design invoices (`Schematic → Design Development → Construction Documents → Field Review`) with automated `5%` GST, `13%–15%` HST, or `14.975%` Québec `GST + QST` and export CRA `T2125` / Revenu Québec `TP-80-V` schedules in the **[Free Canadian Design & Consulting Invoice Calculator](/keel/invoice-generator/)** (or click **🔗 Embed / CSV Template**), email **mert@usekeelapp.com** for **Free `.keel` Data Setup**, explore the **[Québec Travailleur Autonome App Store Edition](/keel/cpp/quebec-travailleur-autonome/)** and **[Consultant Edition](/keel/cpp/consultants-and-freelancers/)**, or **[Download Keel on the App Store (`$0/mo` Core — 100% Unlimited)](https://apps.apple.com/us/app/keel-invoice-maker-receipts/id6786659713?ppid=1883fcbe-ca1d-4b99-b3d6-bdd88476d75f&pt=127772795&ct=blog_vergi_ca-qc-architect-t2125&mt=8)** (`ca-trades`).

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## Why do independent Canadian & Québec architects, interior designers, and engineering consultants overpay tax by `$2,900–$6,800` a year?

Sole-practitioner architects (`OAA, OAQ, AIBC, AAA, MAA, NSAA`), licensed interior designers (`ARIDO, IDC, APDIQ`), architectural technologists (`OAAAS, AATO, OTPQ`), and independent consulting engineers (`PEO, OIQ, EGBC, APEGA`) report their professional income on **CRA Form `T2125` (*Statement of Business or Professional Activities*)**—and in Québec, concurrently on **Revenu Québec Form `TP-80-V` (*Business or Professional Income and Expenses*)**—under [Canada Revenue Agency (CRA)](https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/t4002/t4002-1.html) and [Revenu Québec](https://www.revenuquebec.ca/en/businesses/income-tax/self-employed-persons/) rules.

Because net professional income is hit with **federal + provincial income tax (`28%–53%`)** plus **both the employee and employer halves of `CPP` / `QPP` (`11.9%` up to `$74,600` YMPE + `8.0%` `CPP2`/`QPP2` up to `$85,000` YAMPE in 2026)**:

- **Evaluability Hypothesis (`Hsee, 1996`) & Loss Aversion ($\lambda \approx 2.25$):** Every **`$100` in unrecorded A1/A0 plotting receipts, CAD/BIM plugin renewals, fabric/material library shipments, or site-review mileage** costs you **`$32.00 to $48.00` in combined federal/provincial income tax and CPP/QPP contributions**—plus **`$5.00 to $15.00` in lost GST/HST Input Tax Credits (`ITCs`) or Québec Input Tax Refunds (`ITRs`)**!
- Missing just **`$6,500`** in site-visit kilometres (`5,200 km` across residential/commercial jobsites), plotting bureau invoices, and home studio expenses hands the CRA and Revenu Québec **`$2,400 to $3,600` in avoidable cash tax** every April 30.

Compare Canadian professional billing rules in [Architect and Interior Designer Invoice Template Guide](/keel/architect-and-interior-designer-invoice-template-guide/), [Canada T2125 Explained](/keel/canada-t2125-explained/), and [Quebec TP-80-V and CRA T2125 Self-Employed Guide](/keel/quebec-tp-80-v-and-cra-t2125-self-employed-guide/).

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## Which CRA `T2125` and Revenu Québec `TP-80-V` lines apply to professional order dues, E&O insurance, CAD hardware, and site mileage?

Map your architectural, interior design, or engineering practice costs to these exact statutory lines:

| Architectural / Interior Design / Engineering Cost | CRA `T2125` Line | Revenu Québec `TP-80-V` Line | 2026 Statutory Rule + GST/HST `ITC` & Québec `ITR` |
|---|---|---|---|
| **Professional order dues (`OAA`, `OAQ`, `AIBC`, `AAA`, `PEO`, `OIQ`, `EGBC`, `ARIDO`, `APDIQ`, `RAIC`)** | **Line 8760** (*Business taxes, licences, and memberships*) | **Line 236** | **100% deductible** when membership is required to maintain your professional title/stamp or commercial status |
| **Mandatory Errors & Omissions (`E&O` / `Pro-Demnity` / `Fonds des architectes`) & Commercial General Liability (`CGL`)** | **Line 8690** (*Insurance*) | **Line 232** | **100% deductible** (note: insurance premiums are exempt from GST/HST, though provincial retail sales tax on insurance in ON `8%` / QC `9%` is deductible as part of the expense) |
| **CAD, BIM & 3D Rendering Software (`AutoCAD`, `Revit`, `Archicad`, `Vectorworks`, `Rhino`, `Enscape`, `Adobe CC`)** | **Line 8810** (*Office expenses*) or **Line 9270** | **Line 238 / Line 252** | **100% deductible** + **100% GST/HST `ITC` & QST `ITR`** |
| **Workstations, Mac Studio, LiDAR iPad Pro, large-format plotter (`CCA Class 50` / `Class 8`)** | **Line 9936** (*Capital Cost Allowance — Area A*) | **Line 249** | **`Class 50` (`55%` declining balance for computers)** or **`Class 8` (`20%` for plotters/laser distos/studio furniture)**; eligible for **Immediate Expensing (`DIEP`)** up to `$1.5M` + **100% GST/HST `ITC` & `ITR`** |
| **Subcontracted structural/MEP engineers, land surveyors, 3D visualizers & draftspeople** | **Line 8860** (*Professional fees*) or **Line 8360** (*Subcontracts*) | **Line 242 / Line 184** | **100% deductible** + **100% GST/HST `ITC` & `ITR`**; keep supplier GST/HST and QST numbers on file |
| **Site inspection & municipal planning office vehicle expenses (`73¢` / `67¢` per km benchmark)** | **Line 9281** (*Motor vehicle expenses*) | **Line 248** | Deduct business-use % (`business km ÷ total km`) of fuel, insurance, maintenance, and lease/CCA; **2026 CRA benchmark is `73¢/km` (first `5,000 km`) and `67¢/km` thereafter** |
| **A1/A0 blueprint plotting, scale models, material sample boards & courier deliveries** | **Line 8811** (*Stationery and supplies*) or **Line 8523** | **Line 238** | **100% deductible** + **100% GST/HST `ITC` & `ITR`** |
| **Dedicated home architectural / design studio** | **Line 9945** (*Business-use-of-home expenses*) | **Line 257** (`50%` cap on rent/mortgage interest in QC) | Deduct studio floor-area % of heat, electricity, home insurance, property taxes, and rent/mortgage interest (in Québec `TP-80-V`, fixed home costs like rent/mortgage interest/municipal tax are subject to the `50%` rule when the home studio is inside your residence) |

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## How to structure Canadian architectural (`RAIC Doc 6`) and interior design milestone invoices—plus municipal permit disbursements

Under **Excise Tax Act (`ETA`) Section 178** and **Revenu Québec `TVQ. 42-1`**, how you bill municipal building permits, Committee of Adjustment fees, and trade FF&E procurement determines whether you must charge `5%–15%` GST/HST/QST:

1. **Phased Percentage or Fixed-Fee Milestones (`RAIC Document Six` / `ARIDO` Standard Phases):**
   - `Phase 1: Schematic Design & Zoning By-Law Feasibility (15% of Basic Fee) — $3,750.00 + GST/HST`
   - `Phase 2: Design Development & 3D Massing Coordination (20% of Basic Fee) — $5,000.00 + GST/HST`
   - `Phase 3: Construction Documents & Building Permit Set (40% of Basic Fee) — $10,000.00 + GST/HST`
   - `Phase 4: Bidding/Negotiation & General Review During Construction (25% of Basic Fee) — $6,250.00 + GST/HST`
2. **Municipal Building Permit & Committee of Adjustment Fees (`True Agent Disbursement — 0% GST/HST/QST`):**
   - When you pay a **municipal Building Permit fee, Development Charge, or Committee of Adjustment application fee** strictly as your client's legal agent (the permit application is in the property owner's name) and pass the exact municipal receipt through with **zero markup**, it is a **non-taxable agency disbursement**: do **not** add GST/HST/QST on top of the municipal fee!
3. **Reimbursable Reprographics, 3D Renderings & Travel (`Taxable Input — Subject to GST/HST/QST`):**
   - When you recharge A1 blueprint plotting, courier deliveries, or `$0.73/km` site mileage, those are inputs consumed by your practice to deliver your taxable design service: claim the **Input Tax Credit (`ITC` / `ITR`)** on your cost and apply **GST/HST (`5%–15%`) or Québec `GST (5%) + QST (9.975%)`** to the recharged line on your client invoice.

See full provincial tax rates in [Canada GST/HST Rates by Province](/keel/canada-gst-hst-rates-by-province/) and [Canada CRA GST/HST Input Tax Credit Invoice Requirements](/keel/canada-cra-gst-hst-input-tax-credit-invoice-requirements-guide/).

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## How do home design studio rules (`Line 9945` / `TP-80-V Line 257`) and `73¢/km` site review logs work in Canada & Québec?

Under **Income Tax Act (`ITA`) subsection `18(12)`** and **CRA Folio `S4-F2-C2`**, when your home architectural or interior design studio is your principal place of business (where you draft CAD/BIM drawings, prepare permit sets, and run practice administration), you can deduct the studio floor-area proportion of **heat, electricity, home insurance, property taxes, mortgage interest, and rent** on **CRA Form `T2125` Line 9945** (note that in Québec on **Form `TP-80-V` Line 257**, fixed home ownership/rent costs are subject to the `50%` Québec adjustment rule). Furthermore, because your home studio is your principal place of business, **100% of your round-trip kilometres driven from your home studio to jobsite inspections, municipal permit counters, and trade showrooms** count as business kilometres in your **CRA Motor Vehicle Logbook (`Line 9281`, benchmarked at `73¢/km` for the first `5,000 km` and `67¢/km` thereafter in 2026)**.

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## Worked example: 2026 CRA `T2125` calculation for an Ontario/Québec residential architect & interior designer earning `$118,000`

Suppose a sole-practitioner residential architect or interior designer bills **`$118,000` (excl. HST/QST)** across 9 custom home and renovation projects:
- **Gross Professional Fees (`T2125 Line 8000`):** **`$118,000`**
- **Allowable `T2125` / `TP-80-V` Deductions (`$31,420` total):**
  - **Subcontracted Structural/HVAC Stamp & Measured LiDAR Survey (`Line 8860`):** `$11,200`
  - **Mandatory Professional Order Dues (`OAA / OAQ / ARIDO`) + Pro-Demnity / E&O Insurance (`Lines 8760 & 8690`):** `$4,650`
  - **Revit, AutoCAD, Rhino, Enscape, Adobe CC & A1 Blueprint Plotting (`Lines 8810 & 8811`):** `$4,180`
  - **Mac Studio + 5K Display & iPad Pro (`Class 50` 55% CCA / Immediate Expensing on `Line 9936`):** `$4,890`
  - **Jobsite Inspection Vehicle Logbook (`5,400 business km` out of `9,000 total km` = `60%` of `$6,400` fuel/insurance/maintenance + `$360` site parking on `Line 9281`):** `$4,200`
  - **Home Design Studio (`Line 9945` — `18%` dedicated room share):** `$2,300`
- **Net Professional Income (`Line 9369`):** `$118,000 - $31,420` = **`$86,580`**
- **Total Cash Tax & CPP/QPP Saved:** Documenting those `$31,420` of studio expenses saves **`$11,940` in combined federal/provincial income tax**—plus recovers **`$2,890` in GST/HST Input Tax Credits (`ITCs`) / Québec `ITRs`**!

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## Frequently asked questions

**Are OAA, OAQ, AIBC, PEO, OIQ, and ARIDO annual dues and E&O insurance tax-deductible on T2125?**
Yes. Under **Income Tax Act (`ITA`) subparagraph `8(1)(i)(i)` and section `18(1)(a)`**, annual membership dues required to maintain a professional status recognized by statute (`OAA`, `OAQ`, `AIBC`, `AAA`, `PEO`, `OIQ`, `EGBC`, `ARIDO`, `APDIQ`) are **100% deductible on `T2125` Line 8760 (`TP-80-V` Line 236)**, and mandatory professional liability / Errors & Omissions (`E&O`) insurance is **100% deductible on Line 8690 (`TP-80-V` Line 232)**.

**Should Canadian architectural or interior design consultants use the GST/HST Quick Method?**
Wait—check the statutory exclusion first! Under **CRA Guide `RC4058` (*Quick Method of Accounting for GST/HST*)**, while **interior designers and architectural draftspeople/technologists** generally *can* elect the GST/HST Quick Method (remitting `8.8%` in Ontario on `13%` HST collected and keeping `3.2%`–`4.2%` as profit when input expenses are low), **professional practices providing legal, accounting, or actuarial services** are excluded, and if you pay high GST/HST on subcontracted engineers (`$15,000+`) or buy trade furniture (`FF&E`), the **Regular GST/HST Method** (claiming `100%` exact `ITCs`) usually puts more cash back in your pocket.

**Do I charge GST/HST or QST when designing a remote project for a US client?**
Under **Excise Tax Act Schedule IX, Part V, Section 7**, exported services supplied to a non-resident client are generally **Zero-Rated (`0%` GST/HST/QST)**—*except* where the architectural, interior design, or engineering service is **directly in respect of real property (a physical building or land) situated in Canada**! If a US resident hires you to remodel their vacation home in Whistler, Muskoka, or Mont-Tremblant, the supply is tied to Canadian real property and you **must charge the provincial GST/HST/QST where the property is located**. Conversely, if you design a building or retail store located **in the United States**, your fee is **Zero-Rated (`0%` GST/HST/QST)** while you still claim `100%` of your Canadian `ITCs`!

**What CCA class applies to CAD workstations, plotters, and laser distance meters in 2026?**
Computer hardware and systems software (`Mac Studio`, `Windows RTX rendering workstation`, `iPad Pro`, `5K monitors`) belong in **CCA Class 50 (`55%` declining-balance rate)**, while large-format A1/A0 plotters, laser distance meters, 3D printers, and studio drafting tables belong in **CCA Class 8 (`20%` rate)**—and both qualify for **Immediate Expensing (`DIEP`)** for Canadian self-employed proprietors.

**How do I issue Canadian/Québec design milestone invoices and track T2125/TP-80-V receipts on iPhone for $0?**
Download **[Keel on the App Store (`$0/mo` Core — 100% Unlimited)](https://apps.apple.com/us/app/keel-invoice-maker-receipts/id6786659713?ppid=1883fcbe-ca1d-4b99-b3d6-bdd88476d75f&pt=127772795&ct=blog_vergi_ca-qc-architect-t2125&mt=8)**—no trial clock, no credit card, and no bank login required (*you are completely free to keep using the web calculator anytime, or email **mert@usekeelapp.com** and we will set up your phased fee templates, GST/HST/QST numbers, and `T2125`/`TP-80-V` ledger in `.keel` format for `100% Free`*).

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*Last verified November 8, 2026 against CRA Guide T4002 (Self-Employed Business, Professional, Commission, Farming, and Fishing Income), Revenu Québec Guide IN-155-V (TP-80-V), and Excise Tax Act Section 178 & Schedule IX.*