Tax Code 1257Y Explained

What does 1257Y mean?

The Y suffix used to indicate the age-related allowance for those born before 6 April 1938. The age-related allowance was abolished from 2016/17 onwards but Y codes are still used as an internal HMRC marker for older pensioners. The numerical effect now matches the standard allowance.

Breakdown of the code

• 1257

  Number

  Multiply by 10 - base allowance.

• Y

  Letter

  You were born before 6 April 1938 - historical age-related allowance marker.

Worked example

State pensioner with private pension top-up on £18,000 (paid monthly).

Same effective rate as 1257L.

Who should be on 1257Y?

• Pensioners born before 6 April 1938

Common problems

• Y codes are now rare and may sometimes be reissued as 1257L if HMRC simplifies the record.

What to do if 1257Y looks wrong

1. Sign in to your HMRC personal tax account at gov.uk/personal-tax-account and open the latest P2 (Notice of Coding) - it itemises every adjustment.
2. Compare the code on your most recent payslip with the code HMRC has on file; employers occasionally apply an old code if a P9 was missed.
3. Confirm your employer received your P45, or that you completed a starter checklist if you joined mid-year.
4. Check whether benefits-in-kind such as a company car, fuel, or medical insurance have changed and ask payroll to file an updated P11D.
5. Call HMRC on 0300 200 3300 (Mon-Fri, 8am-6pm) with your National Insurance number if the online tools cannot resolve it.
6. If you have overpaid, HMRC normally refunds via your next payslip once the code is corrected. For closed years request a P800 review.

If you should be on a different code…

Quick decision tree - when 1257Y is the wrong fit, here is the most likely correct code.

• If you have a single PAYE job and no benefits-in-kind - you should be on 1257L.

  Standard personal allowance of £12,570 for England, Wales and NI.