Self Assessment tax calculator 2025/26

A quick estimate of what you'll owe by 31 January 2027. England, Wales & NI. Nothing you type leaves your device.

Employment pay (P60) Tax already deducted (P60) Self-employment profit (after expenses) Rental profit (after expenses, excluding mortgage interest) Mortgage interest on rental property Savings interest (not ISA) Dividends (not ISA)

Your estimate

Total income–

Personal allowance–

Income Tax–

Class 4 National Insurance–

Already paid through PAYE–

Left to pay–

Payment on account (each, Jan & Jul)–

Pay by 31 Jan 2027–

2025/26 rates: personal allowance £12,570 (tapered over £100,000), 20%/40%/45%, savings allowance and £500 dividend allowance, Class 4 NI 6%/2%, 20% credit on mortgage interest. Doesn't include pension or Gift Aid relief, Child Benefit charge, Scottish rates or capital gains. An estimate only, not tax advice.

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Adds expenses, bank import, Child Benefit charge, pension relief, 18 error checks and an HMRC-ready summary.

Also free: take-home pay calculator

See your 2026/27 monthly pay after tax and National Insurance.

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