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What is the £100k tax trap?

The short answer

Once your income goes over £100,000, you lose £1 of your £12,570 tax-free personal allowance for every £2 you earn. That makes the effective tax rate 60% on pay between £100,000 and £125,140. You also lose 30 hours of free childcare and Tax-Free Childcare.

In more detail

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Sources

Last checked against GOV.UK: 9 October 2026