£18,000 After Tax UK 2026/27

How We Calculate £18,000 After Tax

On a gross salary of £18,000 in 2026/27, your personal allowance is £12,570.00 — the amount you earn before income tax starts. After the 5% pension contribution, £4,842.00 of pay is taxable: the first £37,700 of taxable income at the 20% basic rate, then 40% up to £125,140 of income, and 45% above that. Employee National Insurance is 8% on earnings between £12,570 and £50,270, then 2% on the rest. The pension figure assumes the auto-enrolment minimum — 5% of qualifying earnings (£6,240–£50,270) — deducted before tax under a net-pay arrangement; a different scheme or rate changes the result, which is why the “without pension” figure of £16,479.60 a year is shown too.

What's Different at £18,000

At £18,000, £12,570 of your pay — 70% of the whole salary — is covered by the personal allowance, so income tax only touches the £5,430 above it. National Insurance starts at the same £12,570 threshold, at 8% on the slice above it. If your partner earns under the allowance, Marriage Allowance can transfer £1,260 of theirs to you and cut your tax by up to £252 a year.

Expected £1,334.10 — Payslip Says Less?

The calculator says £18,000 should leave about £1,334.10 a month. If your payslip shows less, the usual suspects are a wrong tax code (emergency codes like 1257L W1/M1, or an incorrect K code), a student-loan plan mismatch, or a pension percentage that isn't what you agreed. Upload a payslip photo and we'll compare every deduction line against the 2026/27 rates, or try a custom amount in the take-home pay calculator.