In most cases you do not need to actively claim back emergency tax on your wages. HMRC corrects it automatically once your employer reports the right details, and any overpayment comes back through your next payslip or in a P800 tax calculation after the tax year ends. Pension withdrawals are the exception: the first flexible lump sum is almost always over-taxed on an emergency code, and you usually have to claim that back yourself using an HMRC form. This guide covers both routes for 2026/27, and how to speed each one up.
What Is Emergency Tax?
Emergency tax is what you pay when your employer or pension provider doesn't have enough information to apply your correct tax code. Instead of spreading your tax-free Personal Allowance evenly across the year, the system taxes each payment in isolation, as if you have no allowance carried forward, so you often overpay.
For 2026/27 the standard Personal Allowance is £12,570, and the normal tax code is 1257L. You're on an emergency code if your code shows:
- 1257L W1, week 1 basis (paid weekly)
- 1257L M1, month 1 basis (paid monthly)
- 1257L X, non-cumulative (variable pay dates)
The "W1", "M1" or "X" suffix is the giveaway. If you want to confirm whether the code itself is right, see how to check if your tax code is wrong and our breakdown of what the 1257L tax code actually means. These codes give you the allowance for the current pay period only, ignoring what you've earned and paid so far in the year, which is why they so often over-tax a new job or a one-off payment. (Source: gov.uk emergency tax codes.)
When Does Emergency Tax Happen?
You're most likely to be put on an emergency code if you:
- Start a new job without a P45 from your previous employer
- Start your first job and haven't completed a Starter Checklist
- Move from self-employment into employment
- Take a flexible lump sum or drawdown from a pension for the first time
- Start receiving company benefits or a workplace pension
- Have more than one job or pension at the same time
How Emergency Tax Causes You to Overpay
Under an emergency code, HMRC treats each pay packet in isolation. If you earn £3,000 in your first month at a new job, the system assumes you'll earn that every month, so it taxes you as though you're heading for £36,000 a year, without crediting unused allowance from earlier months when you weren't earning.
The income tax bands for 2026/27 are:
| Band | Taxable income | Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic rate | £12,571-£50,270 | 20% |
| Higher rate | £50,271-£125,140 | 40% |
| Additional rate | Over £125,140 | 45% |
The allowance tapers away once income passes £100,000, disappearing entirely at £125,140. Emergency codes ignore this nuance, which is exactly why the figures rarely come out right first time. (Source: gov.uk income tax rates.)
Want to see what your take-home should be on the correct code? Run your salary through the Zmartly take-home pay calculator and compare it against your payslip. If the numbers still look off, our guide to understanding your payslip explains every tax and NI line in plain terms.
How to Claim Back Emergency Tax, Step by Step
For emergency tax on employment income, the fix is mostly about getting HMRC your correct details so the code is corrected, after which the refund usually reaches you through payroll. Take these steps in order.
1. Hand Over Your P45 (or Complete a Starter Checklist)
This is the single fastest fix. Your P45 from your last employer tells your new payroll team your correct cumulative pay and tax. No P45? Ask for the Starter Checklist instead. Once submitted, HMRC issues your proper tax code and most overpayments are refunded automatically in your next pay run.
2. Check and Update Your Tax Code Online
Log in to your Personal Tax Account to see the code HMRC currently holds. If something looks wrong, a missing allowance, or an old job still showing as active, you can correct it there, or call HMRC on the income tax helpline. Updating your records often triggers an in-year refund without any further action. HMRC says a code change can take up to 35 days to feed through.
3. Let the Automatic Refund Reach You
If your code is corrected mid-year, the refund usually appears in your next payslip as a "tax refund" line, and your take-home jumps for that pay period.
If it isn't sorted by the end of the tax year (5 April), HMRC reviews your records and sends a P800 tax calculation showing what you overpaid. Per GOV.UK guidance on tax overpayments, you can then claim your refund online by bank transfer (sent within 5 working days), or wait for a cheque, which arrives within 14 days of the date on your P800 letter.
4. Claim Directly If Nothing Happens
If you've left the job, or no correction comes through, use the HMRC claim a tax refund tool. It walks you to the right form based on your circumstances, for example a P50 if you've stopped working part-way through the year.
How Long Does an Emergency Tax Refund Take?
- In-year, via payroll: as little as one pay cycle once your code is corrected.
- Via P800 online claim: typically around 5 working days for a bank transfer after you claim.
- Via cheque: within 14 days of the date on your P800 letter.
You have up to four years from the end of the relevant tax year to reclaim overpaid tax, so even older emergency-tax years aren't lost.
How do I claim back emergency tax on a pension withdrawal?
When you take a flexible lump sum from a pension for the first time, the provider must apply an emergency "month 1" tax code, which treats that one-off payment as if you will take it every month. That massively over-taxes it. You reclaim the difference with one of three HMRC forms, P55, P50Z or P53Z, and HMRC usually pays the claim within about 30 days.
The cause is the same as with a new job: with no cumulative code in place, the emergency code gives you only one month's Personal Allowance and one month's worth of each tax band, so a large withdrawal is pushed artificially into the higher and additional rates. The form you use depends on how much of your pot you've taken and what other income you have.
| Your situation | Form to use |
|---|---|
| You took part of your pot and expect to take more this tax year | P55 |
| You emptied the whole pot, stopped working, and have no other taxable income | P50Z |
| You emptied the whole pot but still have other taxable income (wages, State Pension, another pension) | P53Z |
You can file these online with a Government Gateway account or by post. Sources: P55, P50Z, P53Z. If you do nothing, HMRC will still reconcile the year and refund any overpayment through a P800 after 5 April, but claiming with the right form gets your money back in weeks rather than months.
Worked example: emergency tax on a £12,000 pension payment
Illustrative example. Priya, 58, takes a one-off £12,000 taxable pension payment in May 2026 (the taxable part of a larger sum, after her 25% tax-free cash). It's her only income that year. Her provider applies the emergency code 1257L on a month 1 basis, so the tax is worked out as if £12,000 arrived every month:
| Slice of the £12,000 | Rate | Tax |
|---|---|---|
| First £1,047 (one month's Personal Allowance) | 0% | £0 |
| Next £3,142 (one month's basic-rate band) | 20% | £628 |
| Next £6,239 (one month's higher-rate band) | 40% | £2,496 |
| Final £1,572 | 45% | £707 |
| Total emergency tax deducted | about £3,831 |
Because £12,000 is below the £12,570 Personal Allowance, Priya's actual tax bill for the year is nil. She has overpaid the entire £3,831 and reclaims it in full with a P50Z (whole pot emptied, no other income) or a P55 (more withdrawals to come). The figures are illustrative, but the over-taxation pattern is exactly how emergency pension codes work. If you're planning withdrawals, it's worth reading how pension tax relief works first.
How to Check Your HMRC Tax Refund Status
If you're waiting on a refund, you can do an HMRC tax refund check at any time. Sign in to your Personal Tax Account and look under your income tax record: it shows whether HMRC has issued a P800, whether a refund is due, and the stage your claim has reached. If you've already requested a bank transfer, the same account confirms when the money was released. A quick check here is the simplest way to see exactly where your HMRC tax refund is before you chase the helpline.
Do You Need an Accountant to Claim?
For a straightforward employed refund, usually not, the online tools handle it. But it's worth getting advice if you have multiple income sources, recently switched from self-employment, are taking money from a pension, receive taxable benefits, or your P800 figures don't match what you expected. Mistakes in the other direction (underpayments) can quietly build up too. Our FAQ page covers the common edge cases.
Frequently Asked Questions
Will I always be refunded emergency tax?
If you genuinely overpaid, yes, HMRC reconciles your record either in-year or via a P800. The money isn't lost; it's a question of when. For a pension withdrawal you often have to trigger it yourself with a claim form rather than waiting.
How do I know if I'm on an emergency tax code?
Check the code on your payslip or in your Personal Tax Account. An emergency code ends in W1 if you're paid weekly, M1 if you're paid monthly, or X if your pay dates vary. The standard code for 2026/27 is 1257L, which reflects the £12,570 Personal Allowance.
Can I be on an emergency code and underpay instead?
It's possible, particularly with multiple jobs where allowances overlap. That's why checking your code early matters, an underpayment now means a bill later.
Why is emergency tax on a pension withdrawal so high?
Because your pension provider has to use an emergency month 1 code on your first flexible withdrawal. That gives you only one month's Personal Allowance and one month's worth of each tax band, so the system treats a one-off lump sum as if you will take it every month and taxes much of it at 40% or 45%. You claim the overpayment back with form P55, P50Z or P53Z.
Which form do I use to claim back tax on a pension lump sum?
Use P55 if you've taken only part of your pot and expect further withdrawals this tax year. Use P50Z if you've emptied the whole pot and stopped working with no other taxable income. Use P53Z if you've emptied the pot but still have other taxable income, such as wages or the State Pension. HMRC usually refunds within about 30 days.
How fast will HMRC pay an emergency tax refund?
Once your correct code is in place, an in-year refund can reach you in your next pay run. If it's settled after the tax year through a P800, an online bank transfer is sent within 5 working days of you claiming. A pension reclaim on the right form is usually paid within about 30 days.
What if I've already left the job?
Use the HMRC refund tool and, if you've stopped working, the P50 process. You don't need to wait for the old employer to do anything.
How do I claim a tax refund from HMRC?
For overpaid emergency tax, an HMRC tax refund is usually triggered automatically once your code is corrected, either through your next payslip or via a P800 calculation after 5 April. If no correction appears, claim a tax refund from HMRC directly using the online claim a tax refund tool, which routes you to the right form (such as a P50 if you've stopped working) and pays out by bank transfer or cheque.
Stuck on an emergency code, taking money from a pension, or staring at a P800 that doesn't add up? A Zmartly accountant can check your tax position, confirm exactly what you're owed, and make sure you're on the right code going forward. Book a free call and we'll take it from here.
How do I check my HMRC tax refund status?
Sign in to your Personal Tax Account and look under your income tax record. It shows whether HMRC has issued a P800, whether a refund is due, and the stage your claim has reached. If you've requested a bank transfer, the same account confirms when the money was released, so a quick HMRC tax refund check beats phoning the helpline.
