Canadian Income Tax Guide

How Canadian Income Tax Actually Works

Here's the whole thing on the back of a napkin. You add up your income. You subtract your deductions. You calculate tax on what's left, using the federal brackets and your province's brackets. Then you subtract your credits, and compare the result with the tax already taken off your pay. The difference is your refund or your bill.

Everything else, all 200-odd lines of the return, is detail about one of those five steps. The detail matters, of course. That's where the money hides.

Step 1: Total Income (Line 15000)

Employment income from your T4 slip, pensions, Employment Insurance, interest, dividends, rental income, business income, and half of your capital gains. If you're a Canadian resident, foreign income counts too; a foreign tax credit usually stops you being taxed twice. The full list is in what counts as taxable income, and the short list of exceptions in non-taxable income in Canada.

Step 2: Net Income (Line 23600)

Total income minus deductions: RRSP and FHSA contributions, child care, moving expenses, union dues, support payments and a few others. Net income matters beyond your tax bill, because CRA uses it to calculate the Canada Child Benefit, the Canada Groceries and Essentials Benefit (formerly the GST/HST credit) and the Old Age Security clawback. See the full list in our guide to Canadian tax deductions.

Step 3: Taxable Income (Line 26000)

Net income minus a few more items, such as loss carry-forwards. This is the number the brackets apply to.

Step 4: Tax on Taxable Income

Federal tax is 14% on the first $58,523, 20.5% up to $117,045, 26% up to $181,440, 29% up to $258,482, and 33% above that. Only the dollars inside each bracket pay that bracket's rate, so a raise never leaves you worse off. Your province adds its own brackets; the whole set is in our 2026 Canadian income tax brackets.

Step 5: Minus Your Credits

A credit isn't a refund (tax refund vs tax credit explains the difference). Everyone gets the basic personal amount ($16,452 federally for 2026, a little less at high incomes). Then come credits for CPP and EI contributions, the Canada employment amount, age, pensions, disability, medical expenses, tuition, donations and more. Most federal credits are worth 14% of the amount in 2026, because they use the lowest tax rate. Our page on Canadian tax credits lists them with the 2026 amounts.

Who Has to File a Canadian Tax Return?

You must file if you owe tax, if CRA asks you to, if you sold property (including your home), if you have to repay Old Age Security or EI benefits, or if you need to pay CPP on self-employment income, among other reasons. Even with no income, filing is usually worth it: it's how you get the Canada Groceries and Essentials Benefit, the Canada Child Benefit and many provincial credits. Skipping a return to “save time” can cost a family thousands in benefits.

Deadlines That Cost Money

• April 30, 2027: file your 2026 return and pay any balance.
• June 15, 2027: filing deadline if you or your spouse had self-employment income. Payment is still due April 30, and interest runs from May 1.
• March 1, 2027: last day for RRSP contributions that count for 2026 (March 1, 2027 is a Monday, so no weekend shift).
• Quarterly instalments (March 15, June 15, September 15, December 15) if your tax owing is over $3,000 this year and in either of the two years before. The self-employed tax calculator estimates them.

Common Reasons People Owe Tax in April

The full list, with fixes, is in why do I owe taxes this year.

1. Two jobs, or a job plus a pension. Each payer deducts tax as if it were your only income, so the total is too low.
2. Self-employment or side income with no tax taken off, plus both halves of CPP.
3. Investment income and capital gains, where nothing is withheld.
4. A big RRSP or RRIF withdrawal, where the tax withheld at source is often less than the real tax.
5. Old Age Security clawback: 15% of net income over $95,323 for 2026.
6. A forgotten slip found by CRA's matching program; see unreported income letters.

On the pay side: why so much comes off your paycheque, bonus tax, commission income and severance pay tax.

After You File

CRA sends a notice of assessment, and with direct deposit the refund follows within days. Read the “explanation of changes” section; if something changed, the tax document analyzer explains it. CRA can generally reassess an individual's return within three years of the original notice of assessment (longer in some cases, such as misrepresentation), so keep your records for six years. If CRA changes your return and you disagree, our guide on CRA reassessments covers the next 30 days.

Income Tax Questions

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Sources: CRA, Indexation adjustment for personal income tax and benefit amounts (2026); Current year tax rates and income brackets; Department of Finance, Impact of reducing the lowest marginal rate on non-refundable tax credits. Checked October 2026.

Last reviewed October 5, 2026 against CRA and Government of Canada sources. How we check our facts.