TAX CODE
Why has my tax code changed?
HMRC reissues your tax code whenever your circumstances change. The seven most common triggers, what they mean, and what to verify on your payslip.
Educational estimates only. Not tax, legal, financial, payroll or employment advice. Verify with your employer's payroll team or HMRC.
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Common questions
What are the most common reasons HMRC changes my tax code?
A second job (BR or D0 issued for the secondary income), starting or stopping a benefit-in-kind like a company car, owed tax from a previous year (K code applied), a Marriage Allowance claim or transfer (M or N suffix), receiving a state pension, opting into a workplace benefit, or HMRC catching up after late filing.
Will the new code refund me or take more?
It depends. If the new code has a higher numeric portion (e.g. 1257L to 1383L), you will get a refund through your next payslip. If lower (1257L to 800L) or contains K (e.g. K500), more tax will be deducted. The first payslip after the change usually reconciles the year to date.
Can I challenge a tax code change?
Yes. Log in to your Personal Tax Account on gov.uk and review the underlying reason. If you disagree (e.g. the company car was returned), update the relevant entry. HMRC will issue a corrected P9 to your employer, usually within 1 to 2 pay cycles.
How long until my employer applies the new code?
Employers must use a new code from the next pay date that falls at least 7 days after they receive the P9 notice. In practice you will see the new code on your second payslip after HMRC issues it.
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Open the toolPayslipIQ provides educational information and estimated calculations only. It does not provide tax, legal, financial, payroll, accounting, pension, benefits or employment advice. Always verify your payslip, tax code, deductions and take-home pay with your employer's payroll department, HMRC, your pension provider, a qualified accountant, tax adviser or another appropriately qualified professional.