World 10 · Taxes, insurance & financial systems · Lesson 3 of 12

Tax brackets, deductions and credits

Why moving into a higher bracket does not tax all your income at the higher rate.

7 min read · Level: Practical · Free — no account needed to read

The idea

Many income taxes use brackets: different rates for different slices of income. Crucially, each rate applies only to the income inside its slice. Imagine a system where the first 10,000 of yearly income is taxed at 0%, the next 20,000 at 10%, and anything above 30,000 at 20%. Someone earning 35,000 pays nothing on the first 10,000, 2,000 on the next 20,000 and 1,000 on the last 5,000 — 3,000 in total, about 8.6% of their income.

This means moving into a higher bracket never makes you worse off overall: only the income above the threshold is taxed at the higher rate. The rate on your last unit of income is the marginal rate; the share of your total income paid in tax is the average rate.

Deductions and credits reduce tax in different ways. A deduction lowers the income that is taxed; a credit reduces the tax itself, usually unit for unit. Which ones exist, and who qualifies, depends entirely on the country.

Why it matters

Misunderstanding brackets leads people to turn down raises or extra work out of fear of “losing money to a higher bracket” — a fear that is almost always unfounded.

A real example

The situation

Ibrahim is offered overtime but worries it will push him into a higher tax bracket and leave him with less overall.

What happened

He learns that only the extra income above the threshold would be taxed at the higher rate. He takes the overtime, and his take-home pay rises, if by less than the gross amount.

The takeaway

A higher bracket taxed only the new slice, not everything he earned.

How people actually behave

People commonly believe that crossing into a higher bracket raises the tax on all their income, which makes higher earnings feel riskier than they are.

Common mistakes

• Believing a higher bracket applies to your whole income.
• Confusing a deduction with a credit.
• Assuming deductions available elsewhere exist in your country.

Questions to think about

• Do you know which tax bracket your last unit of income falls into?
• What is your average tax rate, compared with your marginal rate?

Try it: Do the slices

1. Find your country’s income tax brackets from an official source.
2. Work out the tax on your income slice by slice.
3. Calculate your average rate and compare it with your top rate.

Words in this lesson

• Tax bracket — A slice of income taxed at a particular rate. Each rate applies only to the income within its slice.
• Marginal tax rate — The tax rate on your last unit of income — the rate any extra income would be taxed at.
• Tax deduction — An amount that reduces the income on which tax is calculated.
• Tax credit — An amount that reduces the tax you owe directly.