For 2026/27, 1257L usually indicates the standard £12,570 Personal Allowance in a PAYE employment or pension. The number represents the tax-free amount used for that source of income, and L indicates entitlement to the standard allowance. It does not apply to everyone — and it isn't automatically the "correct" code. It simply reflects a standard set of circumstances.
How UK tax codes work
Your tax code tells your employer how much of your pay is tax-free before Income Tax is charged. For 1257L, the number corresponds to £12,570. Other codes can reflect adjustments, and K codes work differently. The letters describe the treatment being applied.
Check the whole code, not just the number
- 1257L: the standard allowance is being used for this income.
- C1257L: Welsh tax treatment; S1257L: Scottish tax treatment. Scottish income-tax bands differ.
- W1, M1, X or NONCUM: a non-cumulative emergency basis. Tax looks at the current payment rather than the whole tax-year history.
- 0T: no tax-free allowance is being given for that source; it is not automatically an emergency code.
For other letters, use HMRC's tax-code explanation. Do not copy a colleague's code: personal circumstances differ.
Why your code might change
- A new job, especially without a P45
- Company cars, medical benefits or other taxable benefits in kind
- Underpaid tax from a previous year collected through your code
- Marriage Allowance starting or ending
- HMRC correcting an earlier estimate
- Second or multiple jobs — later jobs commonly sit on BR, D0 or D1
A change is not automatically an error, but an unexplained change is worth checking.
How to check your tax code
- Look at the code printed on your payslip
- Compare it with your latest notice and HMRC's current-year Income Tax service
- If you can't reconcile the code with your circumstances, contact HMRC
When to contact HMRC
Contact HMRC when the code doesn't match your circumstances — for example, it still carries W1 or M1 months after a job change, it includes debts or benefits you don't recognise, or a second job is consuming your allowance unexpectedly. HMRC can review your circumstances and issue a revised code. Payroll should check it applied the correct notice or starter rules; employers cannot choose a preferred code just because an employee requests it.
Frequently asked questions
Does 1257L apply to everyone?
No. Benefits, other income or adjustments can mean a different code is appropriate. Having more than one job does not give you a fresh Personal Allowance for each job.
Does 1257L mean I pay no tax below £12,570?
It normally allocates the standard annual allowance to that income, but deductions also depend on pay frequency, previous pay and whether the code is cumulative. A code is not a guarantee of your final tax bill. National Insurance is a separate calculation; 1257L does not determine it.
My code is 1257L but my tax looks high. Why?
Your deduction depends on your pay level, the pay period and whether the code is cumulative. Compare payslips or read why take-home pay can drop.
See the code alongside the rest of your pay
Use our payslip walkthrough to find the surrounding figures. Explore MyPay if you want to organise and compare your own confirmed payslip information.
Editorial check: 22 October 2026. Applies to the 2026/27 UK tax year; Scottish and Welsh prefixes are explained above. General education, not personalised tax advice. Confirm your own code with HMRC.