Average (Effective) Tax Rate
Taux d'imposition moyen (effectif) in French
Quick definition
Your average tax rate, also called your effective tax rate, is your total income tax divided by your total income. It measures what the whole year actually cost you in tax, and it is always lower than your marginal rate.
Two rates, two questions
Canadian tax has two headline rates, and they answer different questions. Your marginal tax rate answers "what does my next dollar keep". Your average rate answers "what did the year cost me": total income tax divided by total income, nothing more.
If you paid $19,000 of combined federal and provincial tax on $90,000 of income, your average rate is about 21%, no matter which bracket your last dollar landed in.
Why the average is always below the marginal
Two mechanics pull the average down. First, a tax bracket taxes only the slice of income inside it, so only your top slice pays your marginal rate; every slice below it pays less. Second, credits shave the bottom: the basic personal amount alone wipes out federal tax on roughly your first $16,452 of income in 2026 (as of July 2026), and most people have other credits on top.
Stack the two together and the gap is wide. A marginal rate in the low 30s routinely goes with an average rate in the low 20s.
Which rate to use when
Each rate has a job, and mixing them up leads to bad estimates:
- Budgeting and comparing years: the average rate. It tells you what share of your income actually left as tax, which is what a budget needs, and tracking it year over year shows whether your real tax burden is rising or falling.
- Decisions about extra dollars: the marginal rate. An RRSP contribution, an overtime shift, a side contract or a realized gain all add or remove dollars at the top of your income, so they are priced at the margin, not at the average.
The classic error
The most common mistake in Canadian tax math is applying the marginal rate to the whole income: "I earn $90,000 and my rate is 31.48% (as of July 2026), so I must pay about $28,300 of tax." Not even close. Only the top slice pays 31.48%; the real bill is roughly a third smaller, because the lower slices are taxed at lower rates and credits erase tax on the bottom. If a tax number you calculated feels shockingly high, this is usually why.
In Canada
Every province sets its own brackets and credits, so the same income produces a different average rate in each province, and Québec computes its own provincial tax on a separate return. Our Tax Calculator shows your marginal and average rates side by side for every province and territory, using the same 2026 figures as this article.
Worked example: $90,000 in Ontario
An Ontario resident with $90,000 of taxable income in 2026 has a combined marginal rate of about 31.48%. Their actual bill is far smaller: the basic personal amount erases federal tax on the bottom of their income, the first $58,523 of taxed income is federally taxed at only 14% (as of July 2026), and Ontario's own brackets climb the same way from their own bottom step. All in, the combined federal and Ontario tax lands somewhere around $19,000, an average rate of roughly 21% to 22%. Treat that as approximate, since it moves with your exact credits; our Tax Calculator gives the precise figure. The ten-point gap between 31.48% and the average rate is the bracket system doing its job.
Related terms
Reviewed by Alexandre Bernier, CFP®, CIM®, PFP®·Updated July 2026