Stop the penalty clock, calculate your exposure, and build the paper trail you need for CRA penalty relief.
Quick answer: File immediately — even with incomplete numbers — to stop the late-filing penalty compounding. Then calculate the damage using CRA's penalty schedule, request written confirmation from your accountant of what was missed and why, and file Form RC4288 for Taxpayer Relief if the error was theirs. Every extra day unfiled adds to the penalty.
Discovering your accountant missed a CRA deadline is alarming. The natural reaction is to wait — to give the accountant time to explain, to gather complete information, to file a perfect return. That instinct is expensive. The CRA late-filing penalty starts from the day after the deadline and compounds monthly. Every day you wait while trying to understand what happened is a day the penalty grows.
Here is what to do, in order.
The single most important thing you can do after a missed deadline is file the return right now, with whatever figures are available. An estimated or incomplete return stops the late-filing penalty from accumulating further. You can submit an amended return (T2 amendment, HST adjustment, or T1 adjustment) once accurate figures are confirmed.
The CRA does not penalise you for amending a return. It does penalise every additional month you leave a return unfiled.
| Return type | Late-filing penalty (first offence) | Repeat offence (within 3 years) |
|---|---|---|
| T2 Corporate tax return | 5% of unpaid tax + 1%/month up to 12 months | 10% of unpaid tax + 2%/month up to 20 months |
| HST/GST return | 1% of net tax owing + 0.25%/month for 12 months | Same formula — no separate escalation |
| Payroll remittance (PD7A) | 3% (1–3 days late), 5% (4–5 days), 7% (6+ days) | 10% on repeat failure in same calendar year |
| T4 information slips | $100/day (min $100, max $7,500 for up to 50 employees) | Same schedule |
| T1 Personal (if self-employed) | 5% of balance owing + 1%/month up to 12 months | 10% + 2%/month up to 20 months |
In addition to late-filing penalties, the CRA charges compound daily interest on any unpaid balance from the day after the deadline. The prescribed interest rate changes quarterly — check canada.ca for the current rate. Interest applies on top of the penalty, not instead of it.
Contact your accountant immediately and ask for written answers to these specific questions:
These answers matter for two reasons: they help you calculate your exact penalty exposure, and they form part of the evidence package for a Taxpayer Relief application.
The CRA's Taxpayer Relief Provisions allow the CRA to waive or cancel penalties and interest when a deadline was missed due to circumstances beyond your control — including a third-party error such as your accountant's failure to file.
To qualify under the third-party error category, you need to demonstrate:
Supporting documents to include with your RC4288:
If the Taxpayer Relief application does not fully eliminate the penalty and interest, you may have grounds to recover the remaining amount from your accountant through their Errors and Omissions (E&O) professional liability insurance — a requirement for all CPA members in Canada.
Your claim will be stronger if you can show:
Contact the accountant's firm first. Most professional firms prefer to resolve these claims quietly rather than involve their insurer. If they do not cooperate, contact the CPA provincial body (CPA Ontario, CPA BC, CPA Alberta, etc.) to file a professional conduct complaint.
Missed deadlines by accountants are almost always a capacity problem: too many clients, too little process. The return was on someone's list but fell through during a busy period. The business owner had no visibility until the penalty arrived.
The structural fix is to separate bookkeeping from your accountant. When an independent bookkeeper maintains your records monthly and produces a reconciled trial balance well before each filing deadline, your accountant receives a clean, complete package with weeks to spare — not a last-minute scramble. The deadline risk lives at the accountant's end, not in the quality of the books.
At Sharma Jyoti and Co, we provide monthly bookkeeping to Canadian businesses across all provinces. We maintain current records in QuickBooks or Xero, reconcile HST and payroll accounts monthly, and deliver a ready-to-file package ahead of every T2, HST, and payroll deadline. We are ICAI-registered chartered accountants operating remotely from India — at rates of C$35–C$45 per hour, significantly below Canadian bookkeeping costs.
Dealing with a missed deadline right now? We can reconcile your books, prepare the filing package, and give your accountant — or a new one — everything needed to file immediately and stop the penalty clock.
Talk to UsLegally, the business owner is responsible for filing and paying on time. However, if you provided all required information before the deadline and your accountant failed to file, you may recover penalties from their Errors and Omissions insurance. A documented paper trail of your submissions before the deadline is essential to any recovery claim.
For a first offence, the CRA charges 5% of the unpaid tax balance at the missed deadline, plus 1% per complete month the return remains unfiled, up to 12 months — a maximum of 17%. A second offence within 3 years doubles the rate: 10% plus 2% per month for up to 20 months. Daily compound interest applies on top of the penalty.
Yes. The CRA Taxpayer Relief Provisions (Form RC4288) allow penalty and interest relief when a missed deadline was caused by a third-party error — which includes your accountant. You must provide documentation showing you submitted all required information before the deadline and that the filing failure was not yours.
Yes. Filing an estimated or incomplete return stops the late-filing penalty from accumulating further. You can amend the return once accurate figures are ready. The CRA does not penalise amendments. An imperfect return filed today costs far less than a perfect return filed next month — every additional month adds to the penalty.
The Taxpayer Relief Provisions allow applications going back 10 calendar years from the date of the request. In 2026, you can request relief for penalties and interest dating back to 2016. Apply as soon as you have supporting documentation — earlier applications carry more weight with CRA reviewers.