UK Tax Codes · 2026/27
1257L Tax Code Meaning (UK 2026/27)
Who gets the 1257L tax code?
Most UK employees with one job, no Marriage Allowance transfer, no benefit-in-kind adjustments, and no underpaid tax from previous years. If you're under 65, working a standard PAYE job, with no second income, you'll typically have 1257L. About 30 million UK taxpayers had this or its predecessor (1257L has been the standard code since 2021/22 and is unchanged for 2026/27 because the personal allowance is frozen until 2028).
How 1257L affects your pay
Under 1257L, the first £12,570 of your earnings is tax-free, then 20% basic rate applies up to £50,270, 40% higher rate up to £125,140, and 45% additional rate above. Your tax-free allowance is spread evenly across the year — about £1,047/month or £242/week — so each pay period you can earn up to that amount before income tax kicks in.
When to check this code
Check your tax code at the start of each tax year (April), after any change in employment circumstances, after marriage if you're considering Marriage Allowance, or if you receive any taxable benefit from your employer (company car, private medical, etc). Your code should update automatically through HMRC, but errors happen and they're your responsibility to spot.
What to do if it's wrong
If your code looks wrong: (1) check your latest P60 and any P11D forms for benefits, (2) log into your HMRC personal tax account online to see your code's basis, (3) contact HMRC on 0300 200 3300 if the code doesn't match your circumstances. Don't ignore it — wrong codes mean either underpayment (which you'll owe later) or overpayment (which you can claim back).
Example calculation
On £40,000 with 1257L: first £12,570 tax-free; the remaining £27,430 taxed at 20% = £5,486 income tax. Plus 8% NI on income between £12,570 and £40,000 = £2,194. Total deductions: £7,680. Take-home before pension/student loan: £32,320 (about £2,693/month).
Recruiter pro tip
If you've had 1257L for years and your circumstances have changed (started receiving benefits-in-kind, had a side income, got married, etc.), the 1257L might be technically wrong even if it stays. Check annually using your HMRC personal tax account — the most common UK tax code error is staying on 1257L when you should be on something else after circumstances change.
Related tax codes
BR — Basic Rate
BR stands for 'Basic Rate' — meaning all your income from this job is taxed at 20%, with no personal allowance…
D0 — Higher Rate
D0 means all income from this source is taxed at the higher rate (40%) with no personal allowance applied. D0 …
K — Owed Tax Adjustment
K codes (e.g. K123, K500) mean you have less than zero personal allowance — typically because of underpaid tax…