Tax · Corporations
Corporate tax instalment calculator.
The corporate counterpart to the site's personal income tax instalment calculator — a different CRA mechanism with a different threshold, a monthly (not quarterly) default, and a small-CCPC carve-out that lets some corporations pay quarterly instead.
Instalments are owed if tax payable is over $3,000 in both the current and previous tax year (and it isn't your first tax year). Most corporations pay monthly; an eligible small CCPC can pay quarterly instead.
Inputs
Result
Enter your figures and press Calculate.
How the rule works
A corporation does not owe instalments in its first tax year, or if tax payable is $3,000 or less in either the current or the previous tax year — equivalently, instalments are only required when tax payable exceeds $3,000 in both years. Most corporations that owe instalments pay monthly, due one month less a day from the start of the tax year, then the same day each following month.
An eligible small CCPC can pay quarterly instead, if at the time each payment is due it has a perfect compliance history, has claimed the small business deduction for the current or previous year, and both the corporation and any associated corporations have taxable income of $500,000 or less and taxable capital employed in Canada of $10,000,000 or less, for the current or previous year.
This tool implements CRA's prior-year method only: each instalment is last year's tax payable divided by 12 (monthly) or 4 (quarterly) — the option T7B-Corp describes as removing instalment-interest risk even if the current year turns out higher.
Sources, last verified 25 September 2026: Canada.ca — Who has to pay in instalments, Canada.ca — Due dates for payments, CRA T7B-Corp — Corporation Instalment Guide (2025).
Frequently asked questions
Is this the same $3,000 threshold as the personal instalment rule?
The dollar figure is the same, but the test is different. Personal instalments look at the current year AND either of the two preceding years. Corporate instalments look at only the current year and the one immediately preceding tax year.
What if I don't qualify as an eligible small CCPC?
You pay monthly instead of quarterly — the instalment requirement itself doesn't change, only how often you pay and therefore the size of each individual payment.
Does the balance-due date change with quarterly instalments?
The balance-due day is generally 2 months after the tax year-end, but a qualifying CCPC that claimed the small business deduction and meets the income/capital limits may get a 3-month balance-due day instead — a separate perk from the instalment frequency itself.
Estimate only — not tax advice
Models only the prior-year method for Part I tax; does not model the current-year method, CRA's blended no-calculation reminder amount, or Parts VI/VI.1/XIII.1 tax. "Tax payable" here is a single figure you supply, not derived from a full T2 return. Confirm your exact instalment requirement and amount through your CRA My Business Account.