Payslip Checker for Cardiff on Tax Code K500

Cardiff is a large urban workforce of around 370k residents in South Wales. Median full-time gross pay for the area sits near £31,700 per year (ONS ASHE 2024), and most local employees see their PAYE deducted before they ever check the breakdown. This page focuses specifically on what tax code K500 should look like on a Cardiff payslip. Because K500 is a stable PAYE code, the monthly figures should be broadly consistent across the tax year. Welsh residents normally see a C-prefixed code; K500 does not carry that prefix, so check whether HMRC has the right address for you.

What does K500 mean for Cardiff workers?

K500 carries a personal allowance of £-5,009 spread across the year. Cardiff employers occasionally drop the C prefix during payroll-system migrations, especially after staff move from England.

K500 reduces your effective tax-free allowance by £5,009 across the year (typically about £417 per month). Often issued where company-car benefit-in-kind exceeds the personal allowance, or where prior under-deduction is being collected.

Effective tax + NI rate on this salary: 28%. Estimates based on ONS ASHE median earnings 2024 — your actual pay may differ.

Local context for Cardiff

Welsh residents are charged the Welsh Rate of Income Tax. Although the rates are currently aligned with rest-of-UK rates for 2026/27, the C prefix is still required for HMRC to allocate revenue correctly. Cardiff employees who recently moved from England should confirm HMRC has updated the address — otherwise the C prefix can drop off the next payslip. The Welsh-language HMRC helpline operates from Cardiff and Porthmadog.

Common payroll questions in Cardiff

Should my Cardiff payslip show tax code K500?

K500 should appear if your circumstances match what HMRC expects for this code (k-code adding £5,009 of taxable income.). On a typical Cardiff salary of £31,700 you would expect roughly £612 of income tax per month under this code.

Why does my Cardiff payslip differ from a colleague's on the same code?

Two Cardiff colleagues on tax code K500 can still see different deductions because pension contributions, salary sacrifice, student loan plan, taxable benefits and overtime all sit alongside the tax code. The code only governs the income-tax line. Match the code first, then check pension and NI category, then the variable lines.

Does the Welsh Rate of Income Tax change my Cardiff take-home on K500?

For 2026/27 the Welsh rates align with rest-of-UK rates, so the take-home is materially the same. The C prefix is still required so HMRC can allocate revenue to Wales — not because it changes your tax bill.

What should I do if K500 looks wrong on my Cardiff payslip?

Start with your most recent payslip and your latest HMRC P2 coding notice. If the code on your payslip does not match the code on the P2, the employer is the right first call. If they match but the figure looks wrong, contact HMRC on 0300 200 3300 — your tax code is set by HMRC, not by your Cardiff employer. You can also upload your payslip to PayslipIQ for a free instant breakdown.