Marginal vs average tax rate: what a tax bracket really means

“I don’t want the raise, it will put me in a higher tax bracket.” It is one of the most common money misunderstandings, and it rests on mixing up two different rates. Your marginal rate is what you pay on the next dollar; your average rate is what you pay on all of them. Keep the two apart and tax brackets become far less scary.

Two rates, two different questions

• Average (effective) tax rate = total tax ÷ income. It answers “what share of my pay goes in tax?”, which is the figure to use when budgeting or comparing countries.
• Marginal tax rate = extra tax ÷ extra income, for a small change in income. It answers “if I earn a bit more, or put a bit into a pension, how much of that changes hands?”, which is the figure to use for decisions at the margin.

Under a progressive system the marginal rate is almost always higher than the average rate, because the average blends the lower rates on the first slices of income with the higher rate on the last slice.

How tax brackets actually work

A bracket system splits taxable income into slices and taxes each slice at its own rate. Crossing into a new bracket changes the rate only on the income above the line. Here are the first brackets for a single US filer in 2026, straight from our federal rules file:

Before any of this applies, the standard deduction of $16,100 comes off gross income. Other countries work the same way with different names: the UK has a tax-free Personal Allowance followed by basic, higher and additional rate bands; Australia has a tax-free threshold of $18,200 for residents; Canada has federal and provincial brackets that stack on top of each other.

Worked example: $60,000 in Texas

The person in this example is “in the 12% bracket”, yet pays well under 12% of their pay in federal income tax. Most of their income is taxed at lower rates or not at all.

The pay-rise myth

Now give the same worker a $1,000 raise to $61,000. The engine’s results for the two salaries:

Of the extra $1,000, $803.50 reaches the worker’s pocket. Federal tax takes 12% of the raise and Social Security and Medicare take 7.65%. Nothing about the first $60,000 changes. Even a raise that crosses into a higher bracket only taxes the portion above the threshold at the new rate.

All-in marginal rates in five countries

The bracket rate is only part of the marginal picture. Social contributions, regional taxes and the phasing-out of allowances all add to it. The table shows the average and the all-in marginal rate (income tax plus employee contributions, measured on an extra 100 of gross pay) from each country’s engine, for a single person on default settings in the current tax year.

Two patterns stand out. The gap between average and marginal rates is widest at low and middle incomes, where generous allowances pull the average down while the next pound or dollar is fully taxed. And the marginal rate is not always monotonic: in the UK it is higher at £110,000 than at much larger incomes.

Where marginal rates spike

The UK’s 60% band

The UK Personal Allowance of £12,570 is withdrawn by £1 for every £2 of adjusted net income above £100,000. Each extra £1 in that range is taxed at 40% and also drags 50p of allowance into tax at 40%, an extra 20%. Add 2% National Insurance and the engine’s marginal rate at £110,000 is 62.0%, against 42.0% at £90,000. Pension contributions that bring adjusted net income back below £100,000 save tax at that high rate, which is why the band gets so much attention. The UK calculator shows it.

Australia’s phase-ins

At $30,000 an Australian resident’s average rate is only 4.2%, thanks to the tax-free threshold and the low income tax offset. The marginal rate is 25.0%, though, because the Medicare levy is phased in at low incomes: it rises by 10% of income above $28,011 until the full 2% applies. The Australian pay calculator applies both.

Germany’s formula

German income tax has few brackets in the usual sense. Between the basic allowance and the point where the flat 42% rate begins, the tax is a smooth formula whose marginal rate climbs continuously with income. Combined with social insurance contributions charged from the first euro, this gives a tax class I employee a marginal rate of 41.8% at €30,000 and 48.8% at €55,000 in the engine’s figures. See the Germany net salary calculator.

State and provincial layers

In Canada, federal and provincial brackets stack, so an Ontario employee on $70,000 faces a combined marginal rate of 34.4% including CPP and EI. In the US, state rules add their own quirks: New York recaptures the benefit of its lower brackets above a set income, Illinois withdraws its exemption allowance all at once at a fixed income, and Ohio’s zero bracket ends with a jump. The state pages linked from the US paycheck calculator list these as known cliffs.

Which rate to use for which decision

• Budgeting and comparing jobs: use the average rate, or simply net pay. It tells you what you actually live on.
• Overtime, a bonus or a side income: use the marginal rate. It tells you how much of the extra you keep.
• Pension, 401(k) or salary-sacrifice contributions: the tax relief is worth your marginal rate on the amount contributed.
• Comparing tax systems: look at both. A country with a low average rate can still have a high marginal rate at a particular income.

To experiment with a system of your own, the income tax bracket calculator accepts any allowance and bands and shows the tax slice by slice, and the percentage calculator turns any two amounts into a rate. For converting a marginal hourly figure, the salary to hourly calculator helps. Our gross vs net pay guide shows how the average rate is built up line by line.

This guide explains how things work in general terms. It isn’t financial, tax or legal advice. Spotted something out of date? Email errors@moneyotter.com and we’ll check it against the source.