What are the rules for Canadian tax returns (T1), explained in plain English?

By FastBuySale Newsroom · 5 Nov 2026 · 16m ago

Who has to file a T1, and who should file anyway?

Canadian tax returns T1, formally the T1 income tax and benefit return, are the annual income tax and benefit returns individuals file with the Canada Revenue Agency (CRA). In plain English, the core rules are: for 2025 income, most people had to file and pay by April 30, 2026; self-employed people, and their spouses or common-law partners, had until June 15, 2026 to file, but any balance owing was still due April 30. File late while owing tax and the CRA charges a penalty of 5% of the balance plus 1% for each full month late, up to 12 months, on top of compound daily interest.

Just as important, the T1 is how the CRA calculates your benefit and credit payments. The CRA says you must do your taxes on time every year to keep receiving benefits such as the Canada child benefit, even if you had no income.

Mandatory filing: the CRA explains that doing your taxes is mandatory in certain situations, for example if you have to pay tax or if the CRA sent you a request to file. By completing a return and reporting income from all sources, both inside and outside Canada, you work out whether tax is owed or a refund is due.

Filing to get money back: even if you do not have to file, the CRA says it can be a good idea. You need to do your taxes to claim a refund or to get benefit and credit payments, and you could be eligible for payments even if you did not earn an income.

Benefits depend on it: the CRA's child and family benefits page says you do not have to apply for benefits and credits every year, but you must do your taxes on time every year to continue receiving the payments you are entitled to, even if you have no income in the year. If you have a spouse or common-law partner, they also have to do their taxes every year. These programs include the Canada child benefit, the Canada Groceries and Essentials Benefit (formerly the GST/HST credit) and the Canada workers benefit. Our explainer covers the credit in detail.

Newcomers: the CRA says new residents report income from all sources that was not reported on a Canadian tax return, even if they had no income, converting amounts to Canadian dollars using the Bank of Canada exchange rate in effect on the date the income was received. New residents can apply for the Canada Groceries and Essentials Benefit before their first return, using Form RC151, or Form RC66 if they are eligible for the Canada child benefit.

Part-year residents: the CRA notes that if you lived in Canada for only part of the year, you may still have to do your taxes.

Readers evaluating Canadian tax returns should separate marketing claims from the actual rule text that governs their account or product. When two summaries disagree, the governing document or statute wins. If a rule depends on your age, filing status, or income band, re-check it when any of those facts change. Life events quietly move people across thresholds they last reviewed years earlier.

Key T1 dates for the 2025 tax year

February 23, 2026: the CRA said this was the date you could start filing your 2025 return online.

End of February: most tax slips are issued by employers or financial institutions by the end of February. If you have a CRA account, you can get copies there once the CRA processes them. If slips have not arrived by the end of March, the CRA says contact the issuers directly.

March 2, 2026: deadline to contribute to an RRSP, PRPP or SPP for the 2025 tax year. See for how RRSP deductions work.

April 30, 2026: deadline for most people to file their 2025 return and to pay any balance owing.

June 15, 2026: filing deadline if you or your spouse or common-law partner are self-employed. The CRA stresses that any balance owing was still due by April 30.

Weekends and holidays: when a due date falls on a Saturday, Sunday or public holiday, the CRA treats your return as on time if it receives it, or it is postmarked, by the next business day, and your payment as on time if received by the first business day after the due date.

Instalments: people required to pay tax instalments must pay by the instalment due dates; for 2026 the CRA lists March 15, June 15, September 15 and December 15. Missing a date may result in instalment interest.

Penalties and interest: what happens if you are late

Interest: if you owe taxes, the CRA charges compound daily interest starting the day after the due date on any unpaid amount, including amounts from reassessments. The CRA's rates can change every three months based on prescribed interest rates.

Late-filing penalty: if you file after the due date and owe tax, the penalty is 5% of your balance owing plus 1% of the balance owing for each full month late, up to 12 months. Filing late can also delay benefit and credit payments.

Repeated late filing: if you were penalized for 2022, 2023 or 2024 and received a demand to file, the penalty is 10% of the balance owing plus 2% for each full month late, up to 20 months.

Other penalties: the CRA may also charge penalties if you fail to report income and also missed reporting income in any of the three previous years, or if you knowingly or through gross negligence make a false statement or omit information.

File on time even if you cannot pay: the CRA's advice is to file by the due date to avoid the late-filing penalty. It can work with you on a payment arrangement or pre-authorized debit agreement, and people with a personal income tax debt of $1,000 or more may be able to use the Manage balance service in My Account.

Worked example: suppose you owe $2,000 and file three full months late with no prior penalties. The late-filing penalty would be 5% ($100) plus 3 x 1% ($60), so $160, before daily compound interest on the unpaid tax. Filing on April 30 and arranging payments would have avoided the $160. Illustration only; the CRA calculates actual amounts.

How to file your T1 and get it processed

Online with NETFILE: the CRA says you can do your taxes online with NETFILE-certified tax software, which sends your completed return directly to the CRA. This usually takes 2 weeks to process. Several software packages and web apps are available, and some are free.

On paper: you can file a paper return using the right income tax package for your province or territory and mail it. The CRA says this usually takes at least 8 weeks to process.

Free help: if you have a modest income and a simple tax situation, you may be eligible to have your taxes done for free by a volunteer at a free tax clinic, according to the CRA.

Keep records: the CRA says keep supporting documents in case it asks for them, and keep your personal information up to date so benefits are calculated correctly.

Plan ahead: estimate take-home pay with the and see how a refund invested each year could grow with the Tax-free savings options are covered in Browse all tools at

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