CCPC Corporate Tax Calculator Canada

What the CCPC corporate tax calculator does

The calculator estimates the federal and provincial income tax a Canadian-controlled private corporation pays on its active business income, and shows where the split between the small business rate and the general rate falls. It reports the business limit left after the two grinds, how much income falls in each rate band, the tax on each, what the company retains, and what the small business deduction was worth in dollars.

The result is the tax the company itself pays, before anyone takes a salary or dividend out. The low small business rate is mostly a deferral rather than a permanent saving: tax integration takes most of it back when the money is finally paid to a shareholder.

With the default inputs ($400,000 of active income in Ontario, no passive income, full business limit), all the income gets the small business rate. Federal tax is $36,000, Ontario tax $12,800, total $48,800, and the company keeps $351,200. Taxed entirely at the general rate, the same income would have cost $57,200 more.

The two rates every CCPC lives between

Every dollar of active business income in a CCPC is taxed at one of two combined rates. The small business rate is the reduced federal rate (9%) plus the province’s reduced rate on the same slice. The general rate is the full federal rate (15%) plus the province’s general corporate rate. In Ontario the combined rates are 12.2% and 26.5%; in most provinces the gap is roughly 12 to 15 percentage points, large enough to shape how owners pay themselves and when they realize income.

The federal rates come from the parameter set, so they stay current. The small business rate applies to active income up to the business limit and the general rate to anything above it, so the main question is how much of the business limit this corporation actually has.

The business limit and who shares it

The federal business limit is $500,000 of active income a year. A single corporation with no associated companies has all of it. Associated corporations, broadly companies under common control, must share one limit and file an agreement allocating it. The business limit share input is the percentage allocated to this corporation, and the calculator scales the limit accordingly.

Getting the allocation wrong is a common and expensive error. Two sister companies that each claim the full limit are claiming the small business rate on income that should have been taxed at the general rate, and the reassessment usually comes with interest.

How passive income grinds the small business deduction

Since 2019 a CCPC with significant investment income loses the small business deduction on a sliding scale. The measure is adjusted aggregate investment income (AAII) earned in the previous tax year by the corporation and its associated companies: interest, rents, portfolio dividends and the taxable half of capital gains, with some adjustments.

Once AAII passes $50,000, every additional dollar removes $5 of business limit, so the limit is gone at $150,000 of AAII. Both thresholds and the five-to-one rate are parameters here, so the calculator follows any change to the rule.

This grind catches profitable operating companies that have built up a large investment portfolio. Because it looks at the prior year, the damage is done by the time you notice it, so model it a year ahead.

The taxable capital grind

The older rule looks at taxable capital employed in Canada, roughly the corporation’s equity plus its debt, again across the associated group. Below $10 million nothing happens. Between $10 million and $50 million the business limit falls on a straight line, and above $50 million it is nil.

The upper threshold was raised from $15 million to $50 million in 2022, which softened the rule considerably for mid-sized companies. It still affects capital-intensive businesses and groups with large intercompany balances.

When both grinds apply, the CRA uses the larger one. The calculator does the same and reports a single reduction, so you can see which rule is binding.

Why the provincial rates are inputs

Thirteen provincial and territorial governments set their own corporate rates on their own budget cycles, and some use a small business threshold different from the federal one. Instead of a built-in table that could drift out of date, the calculator asks for the two rates that apply in your province. Take them from your province’s current corporate tax page.

The defaults are Ontario’s rates (3.2% and 11.5%), a reasonable starting point but not right for a corporation elsewhere.

Reading the results

The headline figure is total corporate tax. Below it, the federal and provincial split shows which government takes what, and the small business and general income lines show where the business limit divided the income. If the effective rate sits between the two combined rates, the split is working as expected.

The last line, tax saved by the small business deduction, compares your result with the same income taxed entirely at the general rate. That is what protecting the business limit is worth, and it is usually large enough to keep passive income and taxable capital under review.

Every figure here is a planning estimate, not tax advice or a filing position. Corporate tax depends on facts this calculator cannot see, so confirm anything material with your accountant before acting.

About This Tool: CCPC Corporate Tax

CCPC corporate tax: use this tool to get an instant, accurate estimate. The figures follow official CRA guidance and every rate and threshold is kept up to date for 2026. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.