What happens if I file my corporate tax return late?

Every corporation must file a T2 each year, even with no activity. File late with a balance owing and CRA charges 5% of the tax unpaid on the filing due date, plus 1% of that amount for each full month the return is late, to a maximum of twelve months — so the penalty tops out at 17% of what you owed. Interest at the prescribed rate runs on top, compounded daily. If CRA demanded the return and you were also penalized for filing late in one of the three previous years, the penalty doubles to 10% plus 2% per month, up to twenty months, a ceiling of 50%.

The exact formula, with an example

The penalty is calculated on the unpaid tax at the filing deadline, not the total tax for the year. A corporation with $20,000 of tax still owing that files its T2 five months late pays 5% ($1,000) + 1% × 5 months ($1,000) = $2,000, before interest. The same corporation as a repeat offender pays 10% ($2,000) + 2% × 5 months ($2,000) = $4,000. Partial months do not count; CRA counts complete months from the filing due date.

Compare the HST late-filing penalty — 1% plus 0.25% a month — and it is clear which return to prioritise when a corporation is behind on both: the T2 penalty is five times steeper from the first day and four times steeper each month after.

Two deadlines, and the one people miss

A T2 is due six months after the fiscal year-end. The tax itself is due earlier: two months after year-end for most corporations, three months for a Canadian-controlled private corporation claiming the small business deduction whose taxable income (with any associated corporations) was under the business limit the year before. An owner who waits for the filing deadline to think about the bill has already been accruing interest for three or four months, on time or not. A June 30 year-end means the tax is due August 31 or September 30, and the return December 31.

Interest on top of the penalty

Interest is charged at CRA’s prescribed rate for overdue amounts — 7% for October to December 2026, reset every quarter — compounded daily on the unpaid tax from the balance-due day, and on the penalty itself from the filing due date. There is no cap. If the corporation was supposed to pay monthly or quarterly instalments during the year (required once last year’s tax was over $3,000), instalment interest is a separate charge underneath all of this.

The repeat-offender rule

The doubled penalty needs two conditions at once: CRA issued a demand to file for the year, and the corporation was charged a late-filing penalty on a T2 for any of the three previous tax years. One late year on its own stays at 5% plus 1%. It is the second late year, after a demand letter, that moves the corporation to 10% plus 2% and stretches the count from twelve months to twenty.

Nil returns still count

No tax owing means no penalty base, so a late nil return costs nothing in penalty. It still leaves the corporation non-compliant: an unfiled T2 holds up refunds and credits, is the first thing a lender or a buyer asks about, and gives CRA the option of an arbitrary assessment — a tax bill of its own estimate that the corporation then has to file to displace. And a corporation that is owed a refund has three years from year-end to file for it; after that CRA does not have to pay it out.

Already behind? How to shrink the damage

The penalty is a function of two numbers, unpaid tax and months, and only one of them can still be changed. Pay whatever you can toward the estimated tax now, before the return is ready: the penalty is calculated on what was unpaid at the filing deadline, and interest stops on every dollar paid. Then file, even with imperfect books — an amended return later costs far less than another month of penalty. If the corporation has never been contacted by CRA about the year, the Voluntary Disclosures Program can cancel the penalty entirely; it is off the table the moment a demand letter arrives.

This is general information, not tax advice for your situation. Get started and a Canadian accountant will give you the answer for your business.