CRA Interest & Penalties Calculator 2026
The CRA interest and penalties calculator helps estimate what you could owe when you pay Canadian personal income tax late. It can also estimate a late‑filing penalty when you file after your deadline with a balance owing. If you missed the payment deadline, the CRA charges compound daily interest on the outstanding balance. This calculator gives you a planning estimate rather than an official CRA account balance.
Calculate Your Estimated CRA Interest and Penalties
A CRA interest and penalties calculator estimates the cost of leaving a personal income tax balance unpaid. It calculates interest based on the unpaid amount, applicable dates, and CRA‑prescribed interest rates.
🧮 CRA Interest & Penalties Calculator — 2026
This is a planning estimate only. Your actual CRA balance may differ due to partial payments, account credits, reassessments, and CRA rounding. Check your CRA My Account for the official balance owing.
Enter your unpaid balance, due date, and payment date, then click Calculate to see your estimated CRA interest and penalties.
How to Use the CRA Interest and Penalties Calculator
The CRA interest and penalties calculator needs accurate dates because interest depends on how long your balance remains unpaid. You should also distinguish between your filing deadline and payment deadline. These dates can differ, especially when you, your spouse, or common‑law partner is self‑employed.
Enter the Amount You Owe the CRA
Enter your unpaid tax balance before adding any interest or penalty estimated by the calculator. If you have already made a partial payment, your calculation becomes more complex.
Enter the Relevant Due Date
Enter the date when your tax payment was legally due, rather than simply entering your tax return filing date. The CRA charges daily compound interest on an outstanding balance beginning the day after the balance becomes due.
Enter Your Payment or Calculation Date
Enter the date when you actually paid your outstanding tax balance. You can enter a future date when estimating how much interest could accumulate before a planned payment. The estimate can change when your calculation crosses into a new quarterly prescribed‑rate period.
Review the Breakdown
Review your original tax debt, estimated interest, estimated penalty, and estimated total separately. If you filed on time but paid late, you may owe interest without a late‑filing penalty. If you filed late and had a balance owing, both interest and a late‑filing penalty may apply.
How CRA Interest Is Calculated on Money You Owe
The CRA charges compound daily interest on an outstanding personal income tax balance beginning after the applicable payment deadline, so interest becomes part of the growing balance used for future interest calculations.
The CRA's prescribed annual interest rate for overdue income tax was 7% during the first, second, and third quarters of 2026. The currently published Q3 rate applies from July 1 through September 30, 2026.
A reliable CRA‑prescribed interest rate calculator should consider:
- The original outstanding balance.
- The exact period that the balance remained unpaid.
- Daily compounding during that period.
- Any payments that reduced the outstanding balance.
- Every CRA‑prescribed rate that applied during the calculation period.
CRA‑prescribed annual interest rates are determined quarterly and can change during the year.
2026 CRA Prescribed Rates & Penalty Formulas
Overdue Tax Interest
Annual rate confirmed for Q1–Q3 2026. Compounded daily. Q4 rate TBC.
Standard Late‑Filing Penalty
5% of balance plus 1% per full month late, up to 12 months.
Repeated Late‑Filing Penalty
Applies when penalty charged in prior 3 years + demand to file. Up to 20 months.
CRA Late‑Filing Penalty vs. Interest: Calculate Them Separately
CRA interest can apply when tax remains unpaid after its payment deadline. A late‑filing penalty generally applies when you file after your filing deadline and have a balance owing.
| Your Situation | What May Apply |
|---|---|
| Return filed on time, but tax paid late | Compound daily interest may apply |
| Return filed late with a balance owing | Late‑filing penalty and interest may apply |
| Return filed late with no balance owing | Standard late‑filing penalty generally does not apply |
Example: Estimating the Cost of Paying the CRA Late
A CRA interest and penalties calculator should show how the estimated balance changes based on your payment date and filing status. The example below uses a simplified calculation for someone who filed on time but paid their 2025 personal tax balance late.
Amount owing: $10,000
Payment due date: April 30, 2026
Expected payment date: June 30, 2026
Applicable annual overdue tax rate: 7%
Estimated interest: About $118
Estimated late‑filing penalty: $0 because the return was filed on time
Estimated total: About $10,118
This example assumes daily compounding and no payments or credits during the 61‑day overdue period. The actual CRA calculation may differ because the agency uses exact account transactions and applicable dates. Your estimate can also change when you make a partial payment or change your payment date. A future quarterly interest‑rate change could also affect longer calculations. CRA prescribed rates can change every three months, even though the overdue tax rate remained 7% through the first three quarters of 2026.
CRA Instalment Interest and Penalties Need a Different Calculation
You should not use a standard CRA interest and penalties calculator to estimate instalment charges unless the calculator specifically supports CRA instalment calculations.
Tax instalments are advance payments toward taxes that you would otherwise generally pay later. For 2026, you may have to pay instalments when your net tax owing exceeds $3,000, or $1,800 for Quebec, for 2026 and either 2025 or 2024.
Most individuals who must pay 2026 instalments have these payment due dates:
When a due date falls on a weekend or CRA‑recognized public holiday, payment is considered on time when received the next business day. Farmers and fishers who meet the applicable income conditions generally have one instalment due date on December 31.
For 2026, CRA applies an instalment penalty only when your instalment interest charges exceed $1,000. The penalty itself is not simply a flat $1,000 charge. CRA first compares $1,000 with 25% of the instalment interest that would apply if you made no instalment payments. CRA uses the higher figure, subtracts it from your actual instalment interest, and divides the remaining amount by two. The result is the instalment penalty.
Why Your Calculator Estimate May Differ From Your CRA Account
Even a detailed CRA interest and penalties calculator can produce a result that differs from your CRA account. Common reasons include:
A CRA‑prescribed interest rate calculator can estimate interest accurately only when it has the correct dates and rates. It still cannot see transactions that exist only within your CRA account. Use the calculator for planning and estimation. Use your CRA account or official CRA correspondence to determine the amount CRA currently says you owe.
CRA Interest & Penalties — Canada 2026
Answers to what Canadians ask most about CRA interest, late‑filing penalties, and overdue tax balances.
ℹ️ About This Calculator
This page is maintained by the CRACalculator team. Interest calculations follow CRA prescribed rates effective for each quarter of 2026: 7% annually for Q1, Q2, and Q3. Late‑filing penalty calculations follow the Income Tax Act standard (5% + 1%/month, up to 12 months) and repeated late‑filing rules (10% + 2%/month, up to 20 months). Results are estimates for planning purposes only and not a substitute for your official CRA My Account balance or professional tax advice.
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