Updated Checked by the Tax-Services.ca editorial team How we check
With missed tax filing deadlines, the first question is whether you owe anything. If you owe nothing, the CRA doesn’t charge a late-filing penalty. If you owe tax, the charge is a flat 5% of what you owe, then 1% more for every complete month of delay, for at most 12 months. Either way, the fix is the same: file now, even if you can’t pay.
What happens after missed tax filing deadlines?
The CRA page on late filing is blunt about it. The penalty applies when you file after the due date and owe tax. The 2025 return was due on 30 April 2026 (or the next business day when that date falls on a weekend or holiday). We couldn’t find a published 2026 return date yet, so check the CRA before you plan around one.
Interest is a separate charge. The CRA charges compound daily interest on the unpaid balance starting the day after the due date, at prescribed rates that change every quarter. We’re not quoting the current rate, because it moves. Filing late doesn’t start the interest. Not paying does.
How big is the late-filing penalty?
| Situation | Penalty on the balance owing | Longest period |
|---|---|---|
| First late filing | 5% up front, then 1% per complete month | 12 months |
| Repeat late filing (penalized in 2022, 2023 or 2024 with a demand to file issued) | 10% up front, then 2% per complete month | 20 months |
| Nothing owing | No late-filing penalty | None |
Say you earned $70,000 in Ontario and only $8,000 was withheld. The tax refund calculator shows income tax of $11,133.91, so you owe $3,133.91. File four full months late and the first-time penalty is 5% plus four points, or 9%. That comes to about $282. The repeat penalty on the same filing would be 10% plus eight points, about $564. And if you wait a full year, the first-time rate reaches 17%, about $533, before any interest.
See how it grows? The delay costs more than the forgotten return ever would.
Should you file late or wait for a letter?
File. Nothing in the CRA’s penalty rules improves with waiting, and every complete month adds 1% (or 2%) of what you owe. You can get a rough number first with the income tax calculator, then file with your slips in front of you. Missing a slip is a smaller problem than missing the return, since you can change a return later through the CRA’s change-my-return options.
If you owe and can’t pay in full, file anyway. The penalty is worked out on the balance owing, and interest runs on whatever remains unpaid, so paying what you can cuts both.
What do you need to file a late return?
The same things as an on-time one: your slips, last year’s return for reference, and any receipts for claims. Slips that never arrived can usually be found in your CRA account, and you can ask employers or banks for copies. Say Priya in Halifax forgot two years in a row. She filed the older year first, then the newer, and wrote down what she’d paid in each. Doing them in order kept her carry-forward amounts straight.
What if you’re owed a refund?
Then there’s no late-filing penalty to worry about, but there’s still a reason to get moving. Benefit and credit payments are worked out from your return, so a missing return can leave them waiting. And a refund you don’t claim is a few hundred bucks, or more, sitting with the government. Pull your slips together and file.
Can you get a late-filing penalty cancelled?
Possibly. The CRA says you can ask it to cancel or waive penalties or interest if circumstances beyond your control kept you from meeting your tax obligations, as set out in its taxpayer relief provisions. Requests are accepted for a 10 year window. A serious illness or a disaster fits that wording. Forgetting doesn’t, as far as we can tell from the page.
We couldn’t confirm a list of what the CRA accepts as beyond your control, so explain the facts and attach what you have. Don’t count on it.
How do you avoid this next year?
Missing one year is often a slip, and the repeat penalty is what punishes a habit. Put the filing date in your calendar in February, gather slips as they arrive in the spring, and file in March or early April rather than on the last night. If you owe at filing time more than once, your withholding may be too low, or you may have income with no tax taken off. The tax instalments calculator shows what quarterly payments might look like for that. Our estimates use 2026 tax data and leave out credits that may apply to you.
The sources behind this page
The penalty rates, the repeat-penalty rules, the 30 April 2026 due date for 2025 returns, the daily compound interest and the 10 year relief window come from the Canada Revenue Agency‘s late-filing penalty page. The balance owing in the example comes from our refund calculator on 2026 tax data, and the penalty is our own arithmetic on the CRA rates. Filing dates for 2026 returns aren’t published on the pages we read.
Frequently asked questions
Is there a penalty for filing late if I owe nothing?
No. The CRA says the late-filing penalty applies when you file after the due date and owe tax.
How much is the late-filing penalty?
A first offence costs 5% of the amount owing, plus 1% for each complete month of delay, to a cap of 12 months.
What is the repeat late-filing penalty?
Double the rates: 10% up front and 2% per complete month, for up to 20 months, if you were penalized in 2022, 2023 or 2024 with a demand to file issued.
Can the CRA cancel my penalty?
You can ask it to cancel or waive penalties or interest when circumstances beyond your control stopped you from meeting your obligations. Requests are accepted within a 10 year window.
Does interest run if I file late?
The CRA charges compound daily interest on an unpaid balance from the day after the due date. Paying what you owe stops more interest building.
- How to file your tax return in Canada: steps and dates
What to gather, when your return is due and how to file in Canada, from the first slip to the notice of assessment that closes the year