C0T tax code
Welsh equivalent of 0T — no personal allowance, Welsh rates apply.
Approx. personal allowance equivalent: £0 per year
What this code means in practice
This code corresponds to roughly £0 of tax-free pay per year.
Emergency or non-cumulative codes often cause temporary overpayment. Read our emergency tax code guide for steps to fix it quickly.
Check your take-home pay
Enter code C0T in our tax code checker or model a full salary with our salary calculator. Compare the result with your payslip to spot overpayment early.
Related reading
Frequently asked questions
What does tax code C0T mean?
Welsh equivalent of 0T — no personal allowance, Welsh rates apply.
Is C0T an emergency tax code?
Yes. C0T is applied on a non-cumulative (W1/M1) or temporary basis. It often causes overpayment until HMRC updates your record with full employment details.
How do I change my tax code?
Update your employment details in your Personal Tax Account at gov.uk, give your employer a P45 when changing jobs, or call HMRC on 0300 200 3300. Your employer applies the new code once HMRC issues it.
TaxHelper provides general information based on published HMRC rates and guidance. It is not regulated financial or tax advice. For decisions involving significant sums, complex circumstances, or if you are unsure, speak to a qualified accountant or HMRC directly.