How Long Do You Stay on Emergency Tax and How to Fix It

How long you stay on emergency tax depends almost entirely on your paperwork. Hand your new employer a P45 or a completed starter checklist promptly and the code usually corrects itself within one to two pay periods. Do nothing, and the temporary code can sit on your payslip until the tax year ends on 5 April, at which point HMRC reconciles the year and refunds what you overpaid.

What Controls the Timeline

Emergency tax is HMRC’s placeholder for when your employer doesn’t have enough information to work out your correct code. Each pay period is treated in isolation, as if that week’s or month’s earnings were the only income you’ll receive all year. You keep a slice of your personal allowance each period, but you lose the cumulative catch-up that normally balances your tax across the year, so most people end up overpaying.1GOV.UK. Tax Codes – Emergency Tax Codes

The code stays in place until HMRC has what it needs to issue a proper one. That trigger is almost always a piece of paperwork moving between you, your employer, and HMRC. The faster the paperwork moves, the shorter the wait.

Realistic Timelines

Paperwork Submitted Before Your First Payday

If you give your employer parts 2 and 3 of your P45, or complete a starter checklist before payroll runs, there’s a decent chance emergency tax never appears on your payslip at all. Most people who submit the right documents in their first week see the correct code applied by their first or second payday.

Paperwork Submitted Later

Hand over the documents after payroll has already run once or twice on an emergency code, and correction typically follows within one to two subsequent pay periods. HMRC sends your employer a P6 notice electronically with the correct code, and your employer must apply it in the next available pay run.2GOV.UK. Understanding Your Employees’ Tax Codes – Changes

No Action Taken

Your employer reports payroll data to HMRC through Real Time Information, and HMRC can sometimes issue a corrected code automatically once its records catch up. But automatic correction isn’t guaranteed. If you never submit a P45 or starter checklist and never contact HMRC yourself, the emergency code can remain in place for the entire tax year. HMRC then reconciles everything after 5 April and issues a P800 letter, usually posted between June and November following the end of the tax year. You could easily wait more than a year from your first emergency-taxed payslip before seeing a refund.

How to Get Off Emergency Tax Faster

Give Your Employer a P45

The quickest fix is handing parts 2 and 3 of your P45 to your new employer. That document carries your previous tax code, total pay to date, and total tax paid, which is everything payroll needs to place you on the right code. If your old employer hasn’t provided one, ask for it directly.1GOV.UK. Tax Codes – Emergency Tax Codes

Complete a Starter Checklist

Without a P45, your employer should give you a starter checklist. You’ll pick one of three statements about your situation:3GOV.UK. Starter Checklist

  • Statement A: this is your first job since 6 April and you haven’t received Jobseeker’s Allowance, Employment and Support Allowance, or Incapacity Benefit since then. This gives you the full personal allowance on a cumulative basis.
  • Statement B: you’ve had another job since 6 April but don’t have a P45, or you’ve received one of the benefits listed above. This usually results in a non-cumulative code until HMRC sorts it out.
  • Statement C: you have another job or receive a state, workplace, or private pension. Your allowance is likely already used elsewhere, so you’ll typically be placed on a BR code.

Read the options carefully. Choosing Statement A when you actually have another job leaves you with too much allowance and an underpayment bill later.

Contact HMRC Yourself

If two pay periods have passed since you handed over the paperwork and nothing has changed, contact HMRC directly. The fastest route is your Personal Tax Account, where you can check your current code and update your income details.4GOV.UK. Check Your Income Tax for the Current Year You’ll sign in with Government Gateway credentials and may need photo ID the first time. The Income Tax helpline and HMRC’s digital assistant are alternatives. Once HMRC updates your record, it pushes the corrected code to your employer.

What the Wait Actually Costs You

How much you overpay while stuck on emergency tax depends on which emergency code you’re on:

On BR or 0T, several months of waiting can add up to hundreds of pounds sitting with HMRC instead of in your account.

Getting the Overpaid Tax Back

If your code is corrected during the same tax year, payroll switches back to a cumulative basis and refunds the excess automatically. Your next payslip will show noticeably higher net pay because it includes both the correct deduction for that period and a refund of the extra tax taken while you were on the emergency code.

If the emergency code stays in place past 5 April, HMRC reviews your total income and tax for the year and sends a P800 calculation letter if you’ve overpaid.6GOV.UK. Tax Overpayments and Underpayments You can claim the refund online, with money arriving in your bank within five working days. Prefer a cheque? Expect it within 14 days of the date on your letter. If you don’t claim online within 45 days, HMRC posts a cheque automatically, which can take up to six weeks in total.7GOV.UK. Tax Overpayments and Underpayments – If You’re Due a Refund

You do get the money back either way. The cost of waiting is having less cash on hand for months while HMRC holds the overpayment, which is why twenty minutes of paperwork now tends to be worth it.