What does tax code C1257L mean?
C1257L (C for Cymru) is the standard code for a Welsh taxpayer: a £12,570 allowance. Welsh Income Tax rates are currently the same as England and Northern Ireland, so your take-home matches the rest-of-UK figure.
England, Wales & NI, 2026/27. We compare your code with the standard 1257L.
On this code
2026/27£12,570 of tax-free pay — the standard amount for 2026/27.
- Gross salary
- £35,000
- Income Tax
- −£4,486
- National Insurance
- −£1,794
Take-home a year
£2,393 a month
£28,720
Compared with the standard 1257L code.
Verified · 2026/2721 June 2026
Effective rate —
Marginal rate — on your next £1
What it's worth in real terms
Your salary has the spending power of — in 2025 money — the pound has lost — since then. A rise of — would just keep pace.
Inflation: ONS Consumer Prices Index, latest May 2026.
How this was calculated
For the 2026/27 tax year (England, Wales & Northern Ireland) we apply your tax-free Personal Allowance, the Income Tax bands, employee National Insurance, and any student-loan repayment — each traced to a dated gov.uk/HMRC source. A pension contribution comes off before Income Tax (and before National Insurance too, for salary sacrifice). Over £100,000 the Personal Allowance tapers away, which is why the marginal rate jumps to about 60%.
The full method and every source is on our methodology page.
Built & maintained by the Pay Packet team · methodology sourced from HMRC · last reviewed 21 June 2026. About our figures →
Who has the C1257L code?
People whose main home is in Wales. HMRC sets the “C” from your address.
Is C1257L the right code for you?
Right if you live in Wales. Because the Welsh rates currently match the rest of the UK, your tax is the same as a 1257L code.
Not your code? Decode any code on the tax code checker, or browse all tax codes. If you think yours is wrong, contact HMRC — you can reclaim overpaid tax for the last four years.