Quarterly Tax Calculator Canada

How to Estimate Quarterly Taxes in Canada

CRA requires quarterly instalment payments from anyone whose net tax owing exceeds $3,000 in the current year and either of the two preceding years. This typically includes self-employed individuals, rental property owners, investors, and retirees whose income isn't fully withheld at source.

CRA offers three approved methods to calculate your instalments. You can use whichever results in the lowest payment — as long as you don't underpay, you won't owe any instalment interest.

Method	How It Works	Best For
1. No-Calculation	Pay the exact amounts on CRA's instalment reminders	Most taxpayers — guaranteed no interest
2. Prior-Year	Last year's net tax ÷ 4 = each quarterly payment	Income similar to last year
3. Current-Year Estimate	Estimate this year's tax and divide by 4	Income significantly higher or lower than last year

💡 Pro Tip: The no-calculation method is the safest option. Even if you end up owing more at tax time, you won't be charged instalment interest as long as you paid what CRA requested.

Step-by-Step: Prior-Year Method Example

This is the most commonly used method. Here's how it works in practice:

📋 Example — Self-Employed Consultant, Alberta

Last year's net income$120,000

Estimated federal tax (2025)$22,300

Estimated Alberta provincial tax$8,400

CPP contributions (self-employed)$7,900

Total net tax owing$38,600

Quarterly payment (÷ 4)$9,650 each

2026 CRA Instalment Due Dates

All four quarterly payments are due on fixed dates each year. Missing a due date triggers immediate interest accrual — even if you pay shortly after.

March 15, 2026 — First instalment payment
June 15, 2026 — Second instalment payment
September 15, 2026 — Third instalment payment
December 15, 2026 — Fourth instalment payment

⚠️ Important: The April 30 tax filing deadline is separate from instalment due dates. Instalments are pre-payments during the year — your final balance is settled when you file your T1 return.

What Happens If You Miss a Quarterly Instalment?

CRA charges compound daily interest on missed or underpaid instalments, starting from the original due date — not your April 30 filing deadline. The current prescribed rate is 8–10% annually, and a missed March 15 payment can accumulate over 13 months of interest before you file.

Instalment interest = shortfall × prescribed rate × days late ÷ 365, compounded daily.
Instalment penalty applies only when interest exceeds $1,000 for the year — it's 50% of the amount over that threshold.
CRA offsets overpaid instalments against interest on underpaid ones (contra-interest), so paying early on one quarter can reduce penalties on a later shortfall.

The fastest way to avoid interest and penalties entirely is to pay the required amount by each due date using the calculator above.

Need more detail? Read our full guide: How to Estimate Quarterly Taxes in Canada →

Reduce Your Tax Instalments Legally

The best way to lower your quarterly payments is to reduce your overall tax liability through strategic planning. Common approaches for Calgary business owners and contractors include:

Maximizing RRSP contributions before year-end
Optimizing salary vs. dividend mix for incorporated owners
Claiming all eligible business deductions and home office expenses
Timing capital gains and losses to minimize annual exposure

Learn how we reduce taxes for Calgary businesses →

🧮 Instalment Calculator

Estimate your quarterly CRA payments

Last Year's Net Tax Owing (from your T1 Notice of Assessment)

Include CPP (self-employed)? (optional)

Estimated Annual Income This Year

Province / Territory

Income Type

Each Quarterly Payment

Based on $0 annual tax

Mar 15, 2026

Jun 15, 2026

Sep 15, 2026

Dec 15, 2026

Estimate only. Based on prior-year method or simplified 2025 rates. Consult a qualified accountant for official tax advice.

Not sure your estimate is right? Book a call →

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Frequently Asked Questions

Who needs to pay quarterly taxes in Canada?

You must pay quarterly instalments if your net tax owing exceeds $3,000 in the current year AND either of the two preceding tax years. This commonly applies to self-employed individuals and freelancers, rental property owners, investors with non-sheltered income, retirees whose pension income isn't fully withheld at source, and small business owners who pay themselves primarily through dividends.

What is the easiest way to calculate CRA instalment payments?

The easiest method is the no-calculation method: simply pay the amounts printed on CRA's instalment reminder letters. This guarantees no instalment interest regardless of your final tax balance. If you don't receive reminders, use the prior-year method: take your net tax owing from last year's Notice of Assessment and divide by four.

When are CRA quarterly tax payments due in 2026?

The 2026 instalment due dates are March 15, June 15, September 15, and December 15. Mark these in your calendar — CRA interest starts accruing on the due date itself, not when you file your return in April.

What happens if I miss a quarterly tax instalment?

CRA charges compound daily interest from the missed due date at the prescribed rate (currently 8–10% annually). If your total instalment interest for the year exceeds $1,000, a 50% surcharge is added to the excess. A missed March 15 payment can accumulate over 13 months of interest before you file your April return.

Can I pay more than my required quarterly instalment?

Yes. Overpaying an instalment creates an instalment credit with CRA, which offsets interest charges on any underpaid instalments later in the year. Excess credits are applied against your April 30 balance or refunded after you file.

Is this quarterly tax calculator accurate?

The prior-year method gives an exact result based on your actual tax history. The current-year estimate uses simplified 2025 federal and provincial rates as a planning tool — it's designed to give a reasonable estimate, not an official CRA calculation. For precise figures, consult a qualified accountant or refer to your CRA My Account portal.