If you’ve ever missed a tax payment or filed late with the Canada Revenue Agency (CRA), you already know there’s a cost. But with prescribed and overdue tax rates sitting at nearly their highest levels in years, the price of falling behind is steeper than many Canadians expect.
Whether you’re an individual, a business owner, or a professional with fluctuating income, understanding how CRA interest and penalties work and how quickly they compound is essential for avoiding unnecessary costs.
Current CRA Interest Rates (2026)
As of the second quarter of 2026, the CRA charges 7% annually on:
- Overdue personal and corporate income taxes
- GST/HST balances
- CPP and EI amounts remitted late
- Late instalment payments
This rate is compounded daily, which means the real cost grows faster than many people anticipate.
Interest begins the day after your payment is due and continues until the amount is paid in full. Interest paid to CRA is not tax-deductible.
Example: One month late
For example, if you owe $10,000 and you pay one month late, the interest is approximately $58. This may not sound like much, but unfortunately, the interest charged on the underlying taxes is just the first (and often smallest) portion of the extra costs.
CRA Penalties for Late Filing
If you file late and owe tax, the penalty will be:
| First time filing late: | Repeated late filing: |
| Immediately: 5% of the balance owing, plus | Immediately: 10% of the balance owing, plus |
| Monthly: 1% of the balance owing for each full month late (up to 12 months) | Monthly: could be doubled to 2% of the balance owing for each full month late (up to 20 months), depending on the last time you filed late |
Example:
Continuing our example from above, where you file a month late while owing $10,000, the penalties the first time filing late would be:
- Immediate: $500 (5% of 10,000) plus
- Monthly: $100 (1% of 10,000 for one month), plus
- Interest at 7% on the penalty amount, compounded daily.
Total penalties and interest charged on penalties = $603
Interest charged on underlying balance owing (calculated above) = $58
Because late-filing penalties are severe, filing on time even if you can’t pay the whole amount owing right away is generally recommended.
Instalment Interest & Penalties
You likely need to pay your tax in advance instalments if any of the following apply:
- You are registered for GST/HST, and you file annually
- You have a corporation
- Your personal tax return includes:
- Investment income,
- Income from self-employment,
- Rental income, and/or
- Other types of income where insufficient tax is withheld at source
Instalment payments are widely disliked as they add to the administrative burden. They can be especially cumbersome in situations where income varies significantly from year to year. However, ignoring the requirement or underpaying instalments can get expensive.
1. Instalment Interest
Underpaid instalments accrue interest at the same rate as other tax obligations: 7% compounded daily (as of 2nd quarter of 2026).
2. Instalment Penalty (if interest > $1,000)
If your instalment interest is greater than $1,000 for the year, CRA levies a penalty on top of the interest. The calculation of this penalty has two steps.
Step 1: Determine which is higher
- $1,000 or
- 25% of the instalment interest you would have paid if you had not made any instalment payments for 2026.
Step 2: Insert the number from Step 1 into the formula:
50% x [Actual instalment interest for the year – amount from step 1]
The result of step 2 is the penalty amount.
Instalment Penalty Example
You were required to pay $5,000 quarterly but paid nothing.
At year end:
- Instalment interest: ~$1,079
- Because the interest exceeds $1,000, you fall into the penalty calculation
- Using formula above
- Step 1: Greater of 1,000 and 25% of 1,079
(1,000 is greater, so we will use that number) - Step 2: 50% [1,079 – 1,000]
= $39.50
- Step 1: Greater of 1,000 and 25% of 1,079
- Using formula above
- Total cost: $1,118.50 (not deductible). This cost applies even if you pay your final balance on time.
How to Avoid Unnecessary Interest and Penalties
1. File On Time—Even If You Can’t Pay
Filing prevents the hefty late‑filing penalty. You can deal with the payment afterward.
2. Make Instalment Payments (Even Partial Ones)
Paying something is better than paying nothing. Partial instalments reduce interest and may even prevent penalties.
3. Use CRA’s Pre‑Authorized Payments
To reduce the administrative burden, set up recurring payments in CRA My Account.
4. Track Your Deadlines
Missed dates are usually due to lack of reminders, not lack of funds.
5. Work With a Professional
A quick planning session can prevent thousands in interest and penalties.
The Bottom Line
CRA interest and penalties add up faster than most people expect. Late filing, missed instalments, and delayed payments all carry real costs, especially at today’s rates.
Filing on time and staying on top of instalments won’t eliminate what you owe, but it will prevent that amount from growing unnecessarily.
Contact McCay Duff LLP for Clarification on CRA Interest and Penalties.
At McCay Duff LLP, our trusted team of Chartered Professional Accountants provides high-quality tax and business advisory services to businesses and individuals in Ottawa and the surrounding area. To learn more about how McCay Duff LLP can provide you with the best tax planning services, contact us online or by telephone at 613-236-2367 or toll-free at 1-800-267-6551.
