Ask PayslipIQ · Last reviewed 2026-05-08
Why am I on emergency tax?
Emergency tax is applied when your employer does not have full information about your previous pay and tax in the current year, usually because no P45 was provided or you started a new job mid-year. Common emergency codes are 1257L W1/M1, BR and 0T.
PayslipIQ 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.
Emergency codes are temporary. They use a non-cumulative basis, meaning each pay period is taxed independently rather than rolling year-to-date.
The fix is normally automatic. Once HMRC receives starter checklist data from your employer, they issue a corrected cumulative code. From that point, any over-deduction is normally refunded through your next pay.
If a month or two passes and the emergency code persists, log into your HMRC personal tax account or call HMRC. Do not use a third-party refund company; HMRC handles this directly.
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Reviewed by PayslipIQ Editorial. Sources cited where applicable.
PayslipIQ 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.