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For an individual, the Canada tax year is the calendar year, January 1 to December 31. Income you earn in 2026 goes on the return you file in 2027, and for most people the deadline is April 30, 2027 (the CRA hasn’t printed that date yet, so treat it as the usual one). Companies play by different rules, and that’s where most of the mix-ups start.
Which dates belong to which year?
Think of two calendars. One decides what income counts. The other decides when paperwork and payments are due. They never line up in the same year, which is why taxes feel like they’re always a year behind.
This table uses the 2025 return, the latest one with confirmed dates. The 2026 return follows the same pattern a year later, according to the CRA’s due dates and payment dates page for individuals.
| Step | Date for the 2025 tax year |
|---|---|
| Year covered | January 1 to December 31, 2025 |
| File, most individuals | April 30, 2026 |
| Pay any balance | April 30, 2026 |
| File, self-employed (business expenses) | June 15, 2026 |
| Pay, self-employed | April 30, 2026 |
If a date falls on a weekend or a recognized holiday, a return counts as on time when it arrives or is postmarked the next business day. A payment has to arrive on that first business day.
Can you choose a different tax year?
Usually not, and this catches sole proprietors out. A sole proprietor, or a partnership made up of individuals, reports business income on a calendar-year basis by default. The CRA lets you elect another fiscal period by filing Form T1139 with your return, but that’s an exception, and you’d want a real reason before you try.
Corporations are different. For a corporation, the tax year is its fiscal period, which can end on any date and can’t run longer than 53 weeks (371 days). A new corporation picks its first year end. The return is due within six months of that date, so a March 31 year end means September 30. A year end of September 23 means March 23.
What does the calendar year mean for your pay?
Your employer reports what it paid you from January to December, and your slips follow that same window. Pay dated in December counts for that year’s return, and pay dated in January counts for the next. So a cheque that lands on December 30 belongs to the old year, even if you don’t spend it until the new one.
Take an Ontario employee on $85,000. The income tax calculator shows $15,551.05 in federal and Ontario tax and $5,769.52 in CPP and EI for the year, so about $63,679 is left. Those are calendar year totals, which is why a December bonus can nudge them.
Withholding along the way may not match the year’s bill. The tax refund calculator compares what was taken off with what you owe, so you can see a refund or balance coming well before tax time.
When do instalments come into the picture?
If your net tax owing is over $3,000 ($1,800 in Quebec) and it was that high in earlier years too, the CRA expects payments during the year, not one lump in April. The dates are March 15, June 15, September 15 and December 15, as set out on the CRA’s page on required tax instalments for individuals. On expected tax of $9,000, four equal payments come to $2,250 each, as the tax instalments calculator shows.
The CRA offers other ways to work out the amounts, and its own reminder figures can be lower than a quarter of your bill. Interest applies to late or short payments.
What if you only worked part of the year?
The year is still January 1 to December 31. If you started a job in September or left one in March, you add up what you were paid inside that window and report it on a single return. There is no such thing as a short personal tax year, and you don’t file twice. Each employer just sends its own slip, so a person with two jobs in one year gets two slips and one return.
What about RRSP contributions and the calendar year?
RRSP money has its own twist. Contributions made in the first 60 days of a year can be claimed on the previous year’s return. For the 2025 return that cut-off was March 2, 2026, so it moves a little each year and you should check the current date before you contribute.
What mistakes come from mixing up the years?
People pay the balance on June 15 because the filing date was June 15. It isn’t. The tax is due April 30, and interest starts then. Picture Dana, a self-employed designer in Halifax, who files in early June and sends the cheque the same day: she’s still paying about five weeks of interest she could have avoided.
Another one is a company owner treating the corporate year like a personal one. If you run a corporation and pay yourself, two clocks run at once: your own calendar year and the company’s fiscal period. To see the company side, try the corporate tax calculator.
Lastly, a late return doesn’t stop the year from being taxed. You’ll owe interest and may face penalties. The rates change, so read the CRA’s notice before relying on any figure.
Where we got these figures
Filing and payment dates for the 2025 return, the fiscal period rules and the corporation deadline come from the Canada Revenue Agency‘s pages, checked in October 2026. The $3,000 and $1,800 instalment thresholds and the instalment dates come from the CRA’s instalment page. Tax amounts use our 2026 federal and Ontario calculators. We’re an independent site, and no government body is behind it.
Not sure which dates apply to you? Try My tax year.
Frequently asked questions
When does the Canadian tax year start and end?
For individuals it runs from January 1 to December 31. A corporation's tax year is its own fiscal period.
When is the filing deadline for the 2025 return?
April 30, 2026 for most people. Self-employed people with business expenses had until June 15, 2026 to file, but still owed any balance on April 30.
Can a sole proprietor pick a different year end?
By default a sole proprietor reports on the calendar year. The CRA allows an election through Form T1139, filed with the return.
How long can a corporation's tax year be?
No longer than 53 weeks, or 371 days. The return is due within six months of the year end.
What if the deadline is on a weekend?
The return is on time if it arrives or is postmarked the next business day. A payment has to arrive that day.
- 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