Canada does not have one income tax — it has two, stacked. The federal government taxes your income with one set of brackets, and the province or territory you live in on December 31 taxes the same income again with its own. On top of both sit two payroll programs, CPP and EI, that are not technically income tax but come off the same paycheque. Understanding the order those layers are applied in is most of what there is to understand.

Step 1: Gross income becomes taxable income

Tax is not charged on everything you earn. First, deductions come off: RRSP contributions, FHSA contributions, union dues, childcare expenses, and — for employees — the enhanced portion of your CPP contribution. What is left is your taxable income, the number both bracket systems actually use. This is why an RRSP contribution is so powerful: it shrinks the number the brackets see, at your highest tax rate.

Step 2: Brackets tax slices, not the whole pie

For 2026 the federal brackets are 14% on the first $58,523 of taxable income, 20.5% to $117,045, 26% to $181,440, 29% to $258,482 and 33% above that. “Progressive” means each rate applies only to the slice inside its band. Someone with $70,000 of taxable income pays 14% on the first $58,523 and 20.5% only on the remaining $11,477 — a federal tax of $10,546 before credits, an average federal rate near 15%, even though their “bracket” is 20.5%. Entering a higher bracket can never make you worse off. Your province then repeats the exercise with its own brackets: Ontario’s run from 5.05% to 13.16%, Alberta’s from 8% to 15%, Nunavut’s from just 4% to 11.5%.

Step 3: Credits quietly erase the first chunk

After the bracket math, non-refundable credits are subtracted at the lowest rate. The biggest is the basic personal amount — $16,452 federally in 2026 (worth $2,303.28 at 14%) plus a separate provincial amount, from $11,932 in Nova Scotia to $22,769 in Alberta. Add the Canada employment amount ($1,501) and credits for your base CPP and EI, and roughly the first $18,000–$25,000 of employment income is effectively sheltered. Credits reduce tax owing but are never refunded if they exceed it — that is what “non-refundable” means.

Step 4: CPP and EI ride along

In 2026 employees pay CPP at 5.95% on earnings between $3,500 and $74,600, plus a 4% CPP2 tier between $74,600 and $85,000, and EI at 1.63% on earnings up to $68,900. Quebec runs its own versions (QPP at 6.30%, EI reduced to 1.30%, plus QPIP). These maximums are why higher earners see deductions stop partway through the year. Details: CPP and EI Deductions Explained.

A worked example: $70,000 in Ontario

An Ontario employee earning $70,000 in 2026 pays $3,956.75 of CPP and $1,123.07 of EI. Her taxable income is $69,335 after the enhanced-CPP deduction. Federal tax after credits is about $7,278; Ontario tax, including the $600 Health Premium, is about $3,856. Total income tax ≈ $11,134 — an average rate of 15.9% — while her marginal rate (on the next dollar) is 29.65%. She keeps about $53,786. Run your own province and salary in the take-home calculator.

Marginal vs average: the two rates that matter

Your marginal rate is the tax on your next dollar — use it for decisions about raises, overtime, bonuses and RRSP contributions. Your average rate is total tax divided by total income — use it to compare your overall burden with another province or country. Confusing the two is the single most common tax misunderstanding in Canada, and it is why a “raise that bumps me into a higher bracket” is still always a raise.