- Applies to: Canada
- ✓ Verified Nov 8, 2026 · 2 official sources
CRA Compliance Desk · Canadian Sole Proprietor & T2125 Rules
Under Canada Revenue Agency (CRA) rules for "Self Employed Architect Tax Deductions Canada: T2125 2026", sole proprietors exceeding the C$30,000 Small Supplier threshold across four consecutive calendar quarters must register for a 15-digit RT GST/HST account, charge provincial GST/HST (5% GST in AB/BC/SK/MB, 13% HST in ON, 14% in NS, 15% in NB/NL/PE), and remit net tax after claiming Input Tax Credits (ITCs) or using the GST/HST Quick Method.
Key Takeaways
- C$30,000 GST/HST Rule: Below C$30,000 in 4 consecutive quarters you are a Small Supplier; once exceeded, register within 29 days and display your 9-digit BN + RT0001 on every invoice.
- T2125 & Dual CPP: Self-employed Canadians contribute 11.9% to base CPP on net earnings between the C$3,500 exemption and the annual YMPE ceiling (50% deductible on Line 22200).
- Key CRA Deadlines: T1/T2125 filing is due June 15 for self-employed individuals and spouses, but any balance owing must be paid by April 30 to avoid daily compound interest.
“Use Form T2125, Statement of Business or Professional Activities, to report your business or professional income and expenses, and keep your supporting receipts and logbooks for six years from the end of the last tax year to which they relate.”
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-VToolkit ($0/Mo— 100% Unlimited): Generate phased design invoices (Schematic → Design Development → Construction Documents → Field Review) with automated5%GST,13%–15%HST, or14.975%QuébecGST + QSTand export CRAT2125/ Revenu QuébecTP-80-Vschedules in the Free Canadian Design & Consulting Invoice Calculator (or click 🔗 Embed / CSV Template), email mert@usekeelapp.com for Free.keelData Setup, explore the Québec Travailleur Autonome App Store Edition and Consultant Edition, or Download Keel on the App Store ($0/moCore — 100% Unlimited) (ca-trades).
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) and Revenu Québec 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$100in unrecorded A1/A0 plotting receipts, CAD/BIM plugin renewals, fabric/material library shipments, or site-review mileage costs you$32.00 to $48.00in combined federal/provincial income tax and CPP/QPP contributions—plus$5.00 to $15.00in lost GST/HST Input Tax Credits (ITCs) or Québec Input Tax Refunds (ITRs)! - Missing just
$6,500in site-visit kilometres (5,200 kmacross residential/commercial jobsites), plotting bureau invoices, and home studio expenses hands the CRA and Revenu Québec$2,400 to $3,600in avoidable cash tax every April 30.
Compare Canadian professional billing rules in Architect and Interior Designer Invoice Template Guide, Canada T2125 Explained, and Quebec TP-80-V and CRA T2125 Self-Employed Guide.
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) |
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:
- Phased Percentage or Fixed-Fee Milestones (
RAIC Document Six/ARIDOStandard Phases):Phase 1: Schematic Design & Zoning By-Law Feasibility (15% of Basic Fee) — $3,750.00 + GST/HSTPhase 2: Design Development & 3D Massing Coordination (20% of Basic Fee) — $5,000.00 + GST/HSTPhase 3: Construction Documents & Building Permit Set (40% of Basic Fee) — $10,000.00 + GST/HSTPhase 4: Bidding/Negotiation & General Review During Construction (25% of Basic Fee) — $6,250.00 + GST/HST
- 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!
- Reimbursable Reprographics, 3D Renderings & Travel (
Taxable Input — Subject to GST/HST/QST):- When you recharge A1 blueprint plotting, courier deliveries, or
$0.73/kmsite 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 QuébecGST (5%) + QST (9.975%)to the recharged line on your client invoice.
- When you recharge A1 blueprint plotting, courier deliveries, or
See full provincial tax rates in Canada GST/HST Rates by Province and Canada CRA GST/HST Input Tax Credit Invoice Requirements.
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).
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-VDeductions ($31,420total):- 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 5055% CCA / Immediate Expensing onLine 9936):$4,890 - Jobsite Inspection Vehicle Logbook (
5,400 business kmout of9,000 total km=60%of$6,400fuel/insurance/maintenance +$360site parking onLine 9281):$4,200 - Home Design Studio (
Line 9945—18%dedicated room share):$2,300
- Subcontracted Structural/HVAC Stamp & Measured LiDAR Survey (
- Net Professional Income (
Line 9369):$118,000 - $31,420=$86,580 - Total Cash Tax & CPP/QPP Saved: Documenting those
$31,420of studio expenses saves$11,940in combined federal/provincial income tax—plus recovers$2,890in GST/HST Input Tax Credits (ITCs) / QuébecITRs!
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)—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).
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.
| CRA Filing Component | Statutory Rule / Form | C$90,000 Gross Revenue Example | Net Tax / Cash Impact (CAD) |
|---|---|---|---|
| Gross Revenue + 13% ON HST Collected | CRA RC4022 (Mandatory > C$30,000) | C$90,000 revenue + C$11,700 HST | C$11,700 HST held in trust |
| T2125 Expenses & Input Tax Credits (ITCs) | C$22,000 expenses + C$2,860 HST paid | Net T2125 Profit: C$68,000 | Remit C$8,840 net HST to CRA |
| Self-Employed CPP Contributions | Schedule 8 (11.9% on net earnings > C$3,500) | C$64,500 pensionable × 11.9% | C$7,676 CPP (C$3,838 tax-deductible) |
| Federal + Provincial Income Tax | T1 General (15% / 20.5% federal + provincial) | Taxable income after CPP deduction | ~C$11,450 income tax (due April 30) |
Based on CRA Guide T4002 and RC4022. Quarterly CRA tax instalments apply once net tax owing exceeds C$3,000 in two consecutive years.
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