Tax Code S1257L Explained

What does S1257L mean?

S1257L marks you as a Scottish taxpayer for the 2026/27 year. The personal-allowance logic is identical to the rUK version of 1257L - the number still represents your tax-free amount, the letter still describes any allowance adjustment - but Holyrood (not Westminster) sets the rates above the allowance. The 2026/27 Scottish bands are: 19% starter rate on the first slice above your allowance, 20% basic rate, 21% intermediate rate, 42% higher rate, 45% advanced rate and 48% top rate above £125,140. HMRC determines residency from your main home, not your employer's location, so a Scotland-based employee at a London-headquartered firm will still be issued an S code. National Insurance is unaffected and continues to use UK-wide thresholds. In practice S1257L behaves exactly as 1257L does on the allowance side: the 1257 is £12,570 of tax-free pay, the L says there is no adjustment to it, and the code is cumulative, so payroll recalculates against your year-to-date earnings every payday and smooths out overtime, bonuses, sick pay and unpaid leave. What differs is everything above the allowance, which runs up the Scottish ladder rather than the rUK one — six bands instead of three, starting gentler at 19% and reaching further at the top. If you see 1257L without the S after moving to Scotland, HMRC has not yet applied the prefix; it normally arrives on the next P9.

How Scottish S-prefix tax codes work

Breakdown of the code

• S

  S

  Scottish prefix - you live in Scotland and pay Scottish income-tax rates (19% / 20% / 21% / 42% / 45% / 48%).

• 1257

  Number

  Multiply by 10 - £12,570 of tax-free personal allowance.

• L

  Letter

  Standard personal allowance with no special adjustment.

Worked example

Operations analyst living in Scotland, single employment on £30,000 (paid monthly).

About £287.59 income tax per month (~£3,451/year) before NI and pension - £34.93 a year LESS than the same salary on 1257L in England, because the Scottish starter rate undercuts the rUK basic rate on the first slice.

Who should be on S1257L?

• Scottish residents whose main home address is in Scotland
• You have one PAYE employment and no taxable benefits-in-kind
• You live in England, Wales (default WRIT rates) or Northern Ireland
• You have not transferred or received the Marriage Allowance
• You have no underpayment from a previous tax year being collected through PAYE

Common problems

• You are still on 1257L despite acquiring a company car or medical insurance - HMRC will reduce your code once a P11D is filed.
• You moved to Scotland or Wales but the S/C prefix has not yet been applied.
• You should be on 1257M because your spouse transferred Marriage Allowance to you.

What to do if S1257L 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 S1257L 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.

• If you have moved out of Scotland - you should be on 1257L.

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