Plenty of owner-managers get a jolt the first time they realize the CRA wants corporate tax paid during the year, not in one go after year-end. Think of corporate tax instalments in Canada as the company’s version of payroll deductions. The bill gets spread out, and Ottawa doesn’t sit waiting for one big cheque. Done properly, they barely register. Get them wrong and they quietly generate interest and, in larger cases, penalties.
Below: who has to pay, how often, how to work out the amounts, and what happens when you come up short.
Who Has to Pay Instalments?
A corporation generally has to pay instalments if its total taxes payable were more than $3,000 in either:
- the current tax year, or
- the previous tax year.
“Taxes payable” here includes federal and provincial income tax, and certain other corporate taxes, after credits. A newly incorporated business with modest profit in its first year often has no instalment requirement. Once profits grow, instalments usually begin.
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Monthly Instalments: The Default
Most corporations that must pay instalments pay monthly, by the last day of each month of their tax year. There are three ways to calculate them, and you can use whichever produces the lowest required payments:
- Option 1: twelve equal payments, each one-twelfth of the estimated tax payable for the current year.
- Option 2: twelve equal payments, each one-twelfth of the tax payable for the previous year.
- Option 3: the first two payments based on one-twelfth of the tax for the year before last, and the remaining ten covering the rest of the previous year’s tax.
Options 2 and 3 are based on actual past figures, so they’re safe from instalment interest even if this year’s profit rises. Option 1 requires a reasonable estimate. If you underestimate, interest applies to the shortfall.
Quarterly Instalments for Small CCPCs
Some small Canadian-controlled private corporations can pay quarterly instead. In broad terms, a corporation qualifies when:
- its taxable income, together with associated corporations, was $500,000 or less in the current or previous year;
- its taxable capital employed in Canada, with associated corporations, was $10 million or less in the current or previous year;
- it claimed the small business deduction in the current or previous year; and
- it has a good compliance history, generally meaning it filed returns and remitted taxes, including payroll and GST/HST, on time over the previous 12 months.
Quarterly payments are due on the last day of each quarter of the tax year, and can be based on one-quarter of the estimated current-year tax or one-quarter of the previous year’s tax. Losing eligibility, for example after a late HST payment, can move a corporation back to monthly instalments.
The Final Balance Still Matters
Instalments don’t replace the balance-due day. After the year ends, any remaining tax must be paid within two months, or three months for qualifying CCPCs. The T2 itself is due within six months.
Instalment Interest and Penalties
If instalments are late or less than required, the CRA charges instalment interest at its prescribed rate, compounded daily. One helpful rule: early or extra instalments can offset interest on late ones, because the CRA calculates interest on the overall timing of payments.
If instalment interest for the year exceeds $1,000, an additional instalment penalty can apply. It’s calculated as 50% of the amount by which the interest exceeds the greater of $1,000 or 25% of the interest that would have applied if no instalments had been made. In practice, the penalty mainly hits corporations that paid little or nothing during the year.
Instalment Reminders
The CRA sends reminders showing suggested instalment amounts. These are generally based on past filings. Pay what the reminder shows, and pay it on time, and you’re usually shielded from instalment interest even when the final tax comes in higher. You could still owe a balance at year-end, of course.
Practical Tips
- Set up automatic payments through your bank or My Business Account. Then a busy month can’t make you forget one.
- Review mid-year. Is profit running well ahead of last year? Paying a bit more now saves you a big balance later. Running well behind? Option 1, with a careful estimate, may let you pay less.
- Watch rate changes. Ontario dropped its small business rate from 3.2% to 2.2% on July 1, 2026. If you’re estimating this year’s tax, use the new rate, and prorate it when your year straddles the change.
- Keep compliance clean. One late payroll or HST remittance can be enough to knock a small CCPC off quarterly status.
- Record instalments correctly in the books. They’re prepaid tax, not an expense line.
A lot of owners only start hunting for a corporate tax accountant Canada wide once that first instalment reminder lands. Better to do it before the first payment is due, while you can still pick the method and amounts on purpose.
A Simple Example
Suppose a CCPC had $24,000 of tax payable last year and qualifies for quarterly instalments. Using the previous-year option, it would pay $6,000 on the last day of each quarter. If this year’s tax turns out to be $30,000, the remaining $6,000 is due on the balance-due day, and no instalment interest applies, because the instalments were based on the prior year’s actual tax and paid on time.
Conclusion
Corporate tax instalments apply once tax payable passes $3,000. For most corporations that means monthly payments; small CCPCs that qualify get to go quarterly. Pick the right calculation method, pay on time, take a look mid-year, and you’ll dodge both interest and an ugly year-end balance. Fold instalments into the monthly routine and the year-end bill stops being a surprise.
Frequently Asked Questions
When does a corporation have to start paying instalments?
When its total taxes payable exceeded $3,000 in the current or previous tax year.
Can my corporation pay instalments quarterly?
Small CCPCs can, if they meet the taxable income, taxable capital, small business deduction and compliance conditions.
What happens if I underpay instalments?
Instalment interest is charged on the shortfall, and a penalty may apply if the interest exceeds $1,000.
Are instalments the same as the final tax payment?
No. Instalments are prepayments. Any remaining balance is due two or three months after year-end.
