Will the budget change the small business deduction for
your medical corporation?

If you own a medical professional corporation, the first question is whether the corporation and its income qualify for the small business deduction. CRA lists a 9% net federal tax rate for Canadian-controlled private corporations claiming that deduction. Incorporation by itself should not be treated as confirmation that every dollar qualifies. Ask your accountant to identify the eligibility rules relevant to your corporation.

There are two separate layers to keep in view: federal corporation tax and provincial or territorial corporation tax. A rate quoted for one layer is not the total tax bill. Likewise, a provincial business limit should not be used as a substitute for checking the federal deduction. This distinction matters when a headline puts a tax rate beside a provincial dollar limit without explaining which rule each belongs to.

CRA lists the net federal rate after the general tax reduction as 15%. It separately lists 9% for Canadian-controlled private corporations claiming the small business deduction. These are federal rate descriptions. They do not establish your eligibility, calculate your provincial tax, or show the amount you personally receive from the corporation.

Avoid taking a provincial limit from the next table and assuming it automatically marks where federal tax moves from one rate to the other. The table is provincial. For a useful conversation with your accountant, ask for federal and provincial calculations separately, with the eligibility assumptions written beside each. That makes it easier to see what a future proposal would actually change.

CRA’s provincial and territorial table lists business limits for the lower provincial or territorial rate. These figures belong to that table, not to a new Budget 2026 announcement. The table below groups the listed jurisdictions by their provincial or territorial limit; it does not establish the federal business limit for your corporation.

Quebec and Alberta are excluded from this table because they do not have a corporation tax collection agreement with the CRA. They administer their own corporate tax, so the provincial side works differently there.

Use this table to identify the provincial question to discuss, not to calculate a combined tax bill. A different provincial limit does not, by itself, mean the federal deduction has changed.

The Department of Finance advisory dated October 20, 2026 says Budget 2026 will be tabled on November 5, 2026. That is a confirmed scheduled event. The advisory does not announce a change to the small business deduction, its eligibility rules, or the business limits listed above. It should not be presented as evidence that those rules have changed.

The announcement describes broad priorities involving investment, jobs and the economy. It is not the detailed budget text. For an incorporated physician, the useful next step is to read any specific tax proposal when it is released, then check its wording and proposed effective date. A broad economic theme is not enough to determine an effect on your corporation.

Pre-budget consultations are also different from final measures. People can submit ideas without those ideas becoming the government’s proposal. If a headline predicts a deduction change, trace it back to the official document it relies on. Be clear about whether you are reading a consultation, an announced proposal, or an enacted rule, and ask your accountant which applies to a decision you are considering.

Write down the decision you are considering before getting drawn into predictions. Is it about money retained in the corporation, personal withdrawals, or a planned home purchase? Bring that specific decision to your accountant, together with the corporate information they request. A focused question is more useful than asking whether a budget headline is generally good or bad for physicians.

Questions for your accountant

• Does the corporation qualify for the federal small business deduction, and for which income?
• Which provincial or territorial limit applies, and how is it different from the federal calculation?
• Would a proposed change affect the planned decision, and on what effective date?
• Which details are confirmed in official documents and which remain uncertain?

If your question is also about a mortgage, keep that discussion separate from tax advice. The related guides below explain incorporated physician mortgage topics. Share the relevant facts of your situation with your mortgage professional and accountant so that each can answer the part within their role. This guide does not turn a corporate tax rate into an estimate of mortgage borrowing capacity.

Keep the source and date with any figure you use. The CRA rate page and the budget advisory answer different questions: one describes corporate rates, while the other announces when the budget is scheduled. Revisit the official budget materials after publication before treating a prediction as a planning assumption. For changes to your own corporation, ask for advice based on your circumstances.

Figures in this guide come from the sources below. Each entry shows the date the source published it, or the date it was accessed when the source does not state one. The page carries a review-by date; after January 2027 treat any number as a starting point and check the source.