Incorporating an architecture practice: the OAA certificate comes before the first fee

Two approvals, in a fixed order

Architecture is one of the Ontario professions where a regulator sits between your articles of incorporation and your first invoice. The corporation is created under the Business Corporations Act, but it may only offer architectural services once the Ontario Association of Architects issues it a Certificate of Practice under the Architects Act. That is a separate application with its own conditions — including who controls the corporation and which licensed architect personally supervises the work — and those conditions are specific enough, and revised often enough, that we confirm the current requirements with the OAA before drafting share provisions, not after.

One structural point trips people up: architects are not part of the same professional-corporation regime that covers Ontario physicians and lawyers. The practice is governed through the certificate itself, so getting the shareholding and directorship compatible with the OAA's rules is the design constraint the articles have to satisfy from day one.

What the corporation cannot carry for you

Professional responsibility stays personal. The architect whose seal and signature go on the drawings answers for them, discipline attaches to the individual licence, and the OAA's mandatory professional liability insurance program continues to apply to the practice whatever its structure — confirm current coverage requirements with the OAA when you apply. Nobody should incorporate a studio believing it makes a defective detail someone else's problem.

What the corporation does absorb is everything commercial: the studio lease, BIM and rendering software subscriptions, subconsultant agreements with the engineers and landscape architects on your projects, staff payroll, and the line of credit that carries a project between milestone bills. Those obligations land on the company that signed them instead of on your house.

How the three practice structures actually compare

The continuity row is the one architects underweight. A studio with a name, a portfolio, and repeat institutional clients is a saleable practice — but only if there is an entity whose shares a successor can buy.

The tax case fits how architecture gets paid

Architectural fees arrive in lumps tied to project phases, while payroll leaves every two weeks — and the corporation is the tool that bridges the two. Profit retained inside the company is taxed at Ontario's small business rate instead of personal rates above 50%, and that spread funds the months between schematic design approval and the next milestone invoice, carries staff through a stalled project, and builds the cushion a practice needs before pursuing larger public work. Draws become a planned salary and dividend mix rather than whatever the account can spare.

Two cautions belong here. Family shareholding is constrained twice — first by the OAA's conditions on who may hold shares in a practice, then by the federal TOSI rules that tax most family dividends from a services firm at top rates. Price the corporation on deferral, not on income splitting someone promised you.

On the HST side, architectural fees are fully taxable, so register from the first invoice rather than waiting out the $30,000 small-supplier threshold — your commercial and institutional clients recover the tax as input tax credits, and registration lets the practice recover HST on software, insurance, and subconsultant fees flowing through your bills. Keep reimbursable disbursements coded consistently so the flow-through does not distort the firm's real margin by phase.

Sequence the cutover between projects

The clean order is: settle a name the OAA will accept for the practice and clear the NUANS search, file articles with OAA-compatible share provisions, obtain the Certificate of Practice, then move banking, insurance certificates, and payroll to the company. Existing client agreements do not migrate by themselves — a multi-year project contract needs the client's consent to move to the corporation, which is why we time the switch between engagements, never mid-construction-administration.

If the practice takes US commissions, the withholding, state registration, and USD fee questions live on our cross-border tax page for architects. For the corporate work itself — articles, registrations, minute book, and the annual filings that follow — see our incorporation and compliance service.

Source: Ontario Association of Architects.