Emergency tax
What it really means
A temporary tax code used when your employer does not yet have full details about you, often in your first job or after a gap. It usually taxes you more than needed; once your correct code arrives, HMRC refunds the difference.
Context, tips & common mistakes
You can recognise emergency tax by the suffix on your payslip's tax code — 'W1' or 'M1' means each week or month is taxed in isolation, ignoring the allowance you have built up since April. It is annoying but temporary: complete the starter checklist properly, and the code normally corrects within a payslip or two once HMRC processes your details, with the overpaid tax refunded automatically through your pay rather than as a separate cheque.
There is nothing to 'apply' for, which is exactly why paid 'refund services' advertising to new workers are poor value — they charge for what happens anyway. If a wrong code drags on past a couple of months, ring HMRC or use the personal tax account to update your details yourself; payroll cannot change your code on their own initiative, they can only apply what HMRC issues.