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You can still file a tax return for 2023 in Canada. The deadline has long gone, but nothing stops you from filing late, and the CRA’s online filing service still accepts returns going back to 2018. The sooner you send it, the less a late penalty can grow.
Can I still file a 2023 tax return?
Yes. The CRA’s page on certified software says you can send first-time returns for tax years 2018 through 2025 online, and that amended returns for 2022 to 2025 can go through ReFILE. So a 2023 return is well inside the range.
What changes is the paperwork and the money. A late return may come with a penalty and interest if you owed tax, and it may hold up benefits you’d otherwise get. The CRA says filing late can interrupt payments such as the GST/HST credit, the Canada child benefit and Old Age Security. That last point matters more than the penalty for a lot of families. If a benefit stopped and you don’t know why, an unfiled return is a common reason to check first.
What does a late 2023 return cost?
It turns on one question: did you owe tax? If your 2023 return shows a refund or a zero balance, there is no late-filing penalty to calculate, because the penalty is a percentage of the balance owing. You lose time, nothing more.
If you did owe, the CRA’s late-filing page describes a first-time penalty of 5% of the unpaid amount, then 1% more for each complete month, capped at 12 months. That page states the rates for the 2025 return. We could not confirm on a CRA page that the 2023 year uses exactly the same rates, so read the current page or your notice before you count on the figure. Interest is charged on top, and we did not confirm the 2023 interest rate either.
| Item | What the CRA page says (2025 return) |
|---|---|
| First late filing | 5% of balance owing, plus 1% per full month, up to 12 months |
| Repeat late filing, demand issued in earlier years | 10% of balance owing, plus 2% per full month, up to 20 months |
| 2025 return due date | 30 April 2026 for most people |
| 2025 due date if you or your spouse ran a business | 15 June 2026 to file, 30 April 2026 to pay |
What do I need to file for 2023?
Slips first. Your T4, T5, T3 and RRSP receipts for 2023 are the core. If you can’t find them, your CRA My Account can show many slips, and you can ask employers or banks for copies. Then gather anything you’d deduct: child care receipts, moving costs, tuition slips, medical bills, donation receipts.
One trap deserves a mention. The tax data on this site is for 2026, and old years use different brackets and different credit amounts. Use software or forms for 2023 itself. Don’t estimate a 2023 return from a 2026 calculator and treat it as the answer. It’s fine for a rough sense of scale, though. Try the tax refund calculator to see whether a year like yours usually lands as a refund or a bill.
Is a late return worth the effort?
Say you earned $30,000 at a job in Ontario. The income tax calculator puts the 2026 tax on that income at $2,452.11. If your employer withheld more than that, the rest was yours to get back and you left it with the CRA. On $60,000 the same tool gives $8,320.50. These are 2026 figures, so your 2023 result will differ, but the pattern holds: the lower your income, the more likely you overpaid and the more a late return is worth.
Credits work the same way. Someone with a low income might also qualify for benefits that are only paid after the CRA has your return. The tax credits calculator covers federal credit amounts only, but it shows how much a credit can be worth before you start collecting receipts.
Mistakes that make a late return worse
Waiting for the perfect paperwork is the big one. If a slip is missing, file with what you have and adjust later. The CRA lets you change a return after filing, and the ReFILE service covers 2022 to 2025 amendments.
Ignoring a letter is the second. If the CRA has sent a formal demand to file, it can lead to the higher repeat penalty in later years. Answer it.
The third is skipping the payment. Filing stops the monthly penalty growing, but a balance still collects interest until it is paid. If you can’t pay it all, file anyway and then call the CRA about a payment plan. We did not check the details of payment arrangements, so ask them what they’d accept.
Where the numbers come from
Filing dates, penalty rates and the online filing years come from pages published by the Canada Revenue Agency for the 2025 tax year, read in September 2026. Example tax figures come from our calculators, which use 2026 federal and Ontario rates.
Frequently asked questions
Is it too late to file my 2023 tax return?
No. The CRA lists returns for 2018 through 2025 as fileable online through certified software.
Will I be penalized for filing a 2023 return late?
Only if you owed tax. The penalty is a percentage of the balance owing, so a refund return has none.
What is the late-filing penalty rate?
The CRA page for the 2025 return shows 5% of the balance plus 1% per full month, up to 12 months. Check the CRA for the 2023 year.
Can a missing return stop my benefits?
It can. The CRA says late filing may interrupt the GST/HST credit, the Canada child benefit and Old Age Security.
Can I use a 2026 calculator for 2023?
Only for a rough idea. Brackets and credit amounts differ by year, so use 2023 forms or software for the real return.
- 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
Information only. This page is general information, not tax, legal or accounting advice. Tax-Services.ca is an independent publisher: we don't prepare or file tax returns or offer tax services, and we have no connection with the CRA, Revenu Québec, any government or any company named on this page. Check the figures that matter with an official source or a qualified professional.