Key term

What it means

Income Tax works in steps. The first part of your income may be tax-free. The next part is taxed at one rate, and income above that may be taxed at a higher rate. These steps are called tax bands. Your marginal Income Tax rate is the rate that applies to your next pound of income that is subject to tax. It does not mean all your income is taxed at that rate. National Insurance and changes to benefits can also affect how much of an extra pound you keep.

Example

Imagine these made-up tax bands: the first £10,000 is tax-free, the next £10,000 is taxed at 20%, and anything above £20,000 is taxed at 40%. If your pay rises from £20,000 to £21,000, you pay 40% tax on the extra £1,000: that's £400. The first £20,000 is still taxed at the lower rates.

Why it matters

A pay rise that takes you into a higher tax band does not normally make your whole income subject to the higher rate.

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