The C1257L Tax Code Explained.
Everything you need to know about what C1257L means for your payslip, your personal allowance, and your take-home pay in 2026/27.
Quick Definition
Welsh taxpayer — standard allowance. The C prefix means you are a Welsh taxpayer. For 2026/27, Welsh Income Tax rates are the same as England and Northern Ireland. Your personal allowance is £12,570.
How much tax will I pay on C1257L?
Use the interactive tool below to see how the C1257L tax code impacts different salary levels. This calculation includes Income Tax and National Insurance for the 2026/27 tax year.
How C1257L affects a £35,000 salary
Annual Income Tax
£4,484
13% of total income
Monthly Take-Home
£2,393
After Tax, NI & Pension
Based on 2026/27 tax rates.Full breakdown →
Disclaimer: This calculator provides an estimate based on standard HMRC tax rules for the 2026/27 tax year. It does not account for cumulative PAYE codes, previous underpayments, or specific employer payroll configurations. It is not professional financial advice. For definitive figures, always refer to your official payslip or your HMRC Personal Tax Account.
Is the C1257L tax code right for me?
Tax codes are assigned by HMRC based on your reported income and circumstances. You might be on C1257L if:
- This is your primary source of employment income.
- HMRC has recently updated your record following a change in benefits.
- You have started a new job and your previous P45 has been processed.
If you believe this code is incorrect, you should contact HMRC as soon as possible to avoid overpaying or underpaying tax.
Frequently asked questions about the C1257L tax code
Frequently asked questions
Related Resources
Still not sure?
Try our full interactive checker to see every deduction on your payslip.
Quick reference — common UK tax codes
Last updated: August 2026. This information is for educational purposes only and does not constitute financial advice. Always verify your specific tax situation with HMRC or a qualified professional.