The corporation is the smoothing device
Profit left inside the practice corporation is taxed at roughly 12.2% on the first $500,000 in Ontario; the same dollar taken personally at the top rate loses more than half. The planning move for a project-driven firm is simple to state and rarely executed: retain in the fat years, draw in the thin ones, and let the corporation hold the difference between what the practice earned and what the household needs. A principal who pays top-rate personal tax on a record year and then borrows through the slow one has run the machine backwards.
This is the standing agenda of our Tax Planning & Advisory work: a household draw sized deliberately, then reviewed each fall against backlog rather than set once and forgotten.
Salary and dividends do different jobs
- Salary is deductible to the corporation, creates RRSP room, builds CPP, and steadies mortgage applications — useful when a principal is financing a house or the firm is financing anything.
- Dividends skip payroll remittances and can be declared in whichever calendar year suits the personal return, which makes them the natural tool for topping up a thin year from a fat one.
- Most principals run a mix, revisited annually. The wrong version is the static one: a salary sized for a year the firm is no longer having.
The timing levers, and when each one moves
Most of the value in a planning year comes from a handful of dated decisions:
| Lever | Window | What it does |
|---|---|---|
| Year-end bonus accrual | Deducted at year-end, must be paid within 180 days | Moves profit out of a strong corporate year into the principal's chosen personal year |
| Dividend declaration | Any time, taxed in the personal calendar year | Fills income valleys without touching payroll |
| CCA claims | Each T2, claiming is optional | Saves depreciation for profitable years instead of deepening a loss |
| RRSP contribution | 60 days after calendar year-end | Converts salary into deferred personal tax |
| Instalment reset | After every T2 | Stops a record year from dictating a slow year's remittances |
The bonus lever earns a second sentence. With a non-calendar year-end, a bonus accrued at an August year-end and paid in January is deducted by the corporation in one fiscal year and taxed to the principal in the next calendar year — a legitimate, dated, documented deferral that only works if the payment actually happens inside the 180 days.
Retained earnings need a destination
Once the corporation holds serious retained earnings, where they sit starts to matter. Passive investment income above $50,000 grinds the federal small business limit by $5 for every extra dollar, so a portfolio growing inside the practice can quietly raise the tax rate on practice profit itself. Options worth pricing before that happens: paying down the operating line, capital-gains-oriented investing that feeds the capital dividend account, or moving surplus into a holding structure — with that last one checked against the Architects Act ownership rules before anything is signed. Principals thinking a decade ahead fold this into estate planning rather than leaving it to the wind-up.
Family income and the two fences
Paying family from an architecture corporation crosses two fences, in order. First, the Architects Act restricts who may hold shares of a corporation with a Certificate of Practice, so the share structure itself needs checking before any dividend plan exists. Second, TOSI taxes most dividends to family members at the top personal rate unless an exclusion applies — a spouse once the principal is 65, or a family member genuinely working in the practice around 20 hours a week. Reasonable wages for real work, a spouse running the office or a student doing renderings, remain the cleanest tool, documented like any other payroll.
None of this is a March conversation. We plan in the fall, when the year can still be shaped, with numbers coming from books we trust. For studios across Mississauga and the GTA, the planning meeting and the year-end filing come from the same desk, so the plan survives contact with the return.
