Tax code C1257L explained
Standard allowance, Welsh rates (currently same as England). Here's exactly what it means for your payslip in 2026/27, who should have it, and what to do if it looks wrong.
What C1257L means
The C prefix (Cymru) marks you as a Welsh taxpayer. Wales has the power to vary its income tax rates, but has so far kept them identical to England and Northern Ireland — so C1257L currently produces exactly the same tax as 1257L.
Who gets C1257L?
Anyone whose main home is in Wales.
What you'd pay on C1257L
| Salary | Income tax | Take-home* | vs standard 1257L |
|---|---|---|---|
| £22,000 | £1,886 | £19,360 | — |
| £30,000 | £3,486 | £25,120 | — |
| £40,000 | £5,486 | £32,320 | — |
| £55,000 | £9,432 | £42,457 | — |
| £80,000 | £19,432 | £56,957 | — |
*After income tax and employee National Insurance, 2026/27 rates, England/Wales/NI bands.
What you should do
Nothing — unless you've moved and the prefix is wrong. Keep your address up to date with HMRC so any future Welsh rate changes apply correctly.
Frequently asked questions
What does tax code C1257L mean?
Standard allowance, Welsh rates (currently same as England). The C prefix (Cymru) marks you as a Welsh taxpayer. Wales has the power to vary its income tax rates, but has so far kept them identical to England and Northern Ireland — so C1257L currently produces
Is tax code C1257L wrong?
Nothing — unless you've moved and the prefix is wrong. Keep your address up to date with HMRC so any future Welsh rate changes apply correctly.
Who gets tax code C1257L?
Anyone whose main home is in Wales.