TL;DR: Emergency tax in the UK is not a fixed rate. It is the tax that results when an employer or pension provider applies an "emergency" tax code, normally 1257L on a Week 1 / Month 1 basis or 0T where the personal allowance has been used elsewhere. The emergency code gives a twelfth (or fifty-second) of the personal allowance for the period and applies the standard rate bands progressively. The deduction can be much higher than the actual tax due, especially on a one-off pension withdrawal. Overpayments are reclaimed in-year via P55 / P53Z / P50Z (for pension overpayments) or via a code change once HMRC has the right information; otherwise HMRC reconciles automatically after the tax year ends.
Last reviewed May 2026
"Emergency tax" is one of those phrases used loosely. People reach for it whenever a payslip shows a much larger tax deduction than expected. In strict HMRC terms, an emergency tax code is the default code that an employer or pension provider must apply when it does not have the right information from HMRC about the employee or pensioner. It is not a punitive rate; it is a placeholder until the proper code is in place.
The amount of tax actually deducted under an emergency code depends on what the underlying gross pay or pension payment is, what code has been applied, and whether the code is being operated cumulatively or on a Week 1 / Month 1 basis. There is no single "emergency tax rate" to quote. What can be quoted is how the codes work and how much tax they typically produce in the common scenarios.
This guide explains the emergency tax code mechanics, the typical scenarios where it appears, what the deduction actually is, and how to recover any overpayment.
What "emergency tax" actually means
HMRC's definition of an emergency tax code is the standard personal allowance (currently 1257L) operated on a non-cumulative basis. Non-cumulative means the code is applied to each pay period separately, ignoring the year-to-date position. Each month gets a twelfth of the personal allowance and a twelfth of each rate band; each week gets a fifty-second.
That treatment can produce results that are roughly right or quite wrong, depending on the situation. For a new starter who has had no pay earlier in the year, the non-cumulative approach probably gives more tax than is due because it ignores the unused allowances from earlier in the year. For a one-off pension withdrawal, the non-cumulative approach treats the single payment as if it will be repeated every month, dragging it into higher rate bands.
The 0T tax code is sometimes also referred to as an emergency code, although strictly it is a "no allowance" code rather than the official emergency code. 0T is used where the personal allowance has been used on another source of income or where the new starter has not provided P45 or new starter information. It applies the standard rate bands progressively to all pay.
Typical scenarios where emergency tax appears
The first common scenario is a new starter. An employee starting a new job who does not provide a P45 from a previous employer, and does not complete the new starter checklist, is put on an emergency code by default. Over a few weeks of pay, the deduction can look much larger than the eventual liability for the year.
The second is a flexible pension withdrawal. A first taxable lump sum from a defined contribution pension is almost always taxed under 1257L on a Week 1 / Month 1 basis, because the pension provider has not been given a proper code by HMRC. The withdrawal is treated as if it will be repeated every month, so a one-off 20,000 pound payment can be taxed as if it were the first month of a 240,000 pound annual income.
The third is a change in circumstances, such as a benefit in kind starting or ending or a previous year's underpayment being collected through the code. HMRC may apply an interim code on a non-cumulative basis while the position is being reviewed.
How much tax the emergency code actually deducts
Under the 1257L Week 1 / Month 1 emergency code, each month gets one twelfth of the 12,570 pound personal allowance (1,047.50 pounds), one twelfth of the basic rate band, one twelfth of the higher rate band, and so on. So an employee receiving 3,000 pounds of pay in a single month under the emergency code would have:
- 1,047.50 pounds tax-free
- The remaining 1,952.50 pounds taxed at the basic rate (20 percent) up to one twelfth of the basic rate band, with any excess at the higher rate
For most monthly salaries within the basic rate band, the result of the emergency code is similar to the cumulative code. The difference becomes substantial in two cases: a new starter with significant unused allowance from earlier in the year (the emergency code does not refund), and a large one-off payment that crosses rate bands (the emergency code drags it into the higher and additional rate bands).
Emergency tax on pension withdrawals
The most striking emergency tax overpayments occur on flexible pension withdrawals. HMRC publishes quarterly statistics on the amount refunded to people overtaxed on pension withdrawals; the cumulative figure since the pension freedoms began in April 2015 is now well into the billions of pounds.
The mechanism is straightforward: the pension provider has no tax code for the member, so it must apply the emergency code on a Month 1 basis. A single 30,000 pound taxable withdrawal is treated as the first month of a 360,000 pound annual income. Most of it falls outside the slim monthly basic-rate slice and is taxed at 40 percent or even 45 percent.
The overpayment can be recovered using one of three forms: P55 (where the saver has taken some of the pension pot but not all of it, and is not drawing regular pension income), P53Z (where the pot has been fully withdrawn and the saver has other taxable income in the year) or P50Z (where the pot has been fully withdrawn and the saver has no other taxable income). Refunds are normally processed within around 30 working days. If no claim is made, HMRC reconciles after the year-end.
Cumulative versus non-cumulative codes
A cumulative tax code recalculates the year-to-date tax position at each pay date. A new starter joining mid-year with a cumulative 1257L code will normally get a refund of any unused allowance from earlier in the year on their first pay packet, because the cumulative calculation looks back to 6 April.
A non-cumulative code (Week 1 / Month 1, often shown as W1, M1 or X) treats each pay period separately. There is no look-back, so no in-year refund of past unused allowance. HMRC reconciles after the year-end.
The decision to operate cumulatively or not depends on the information HMRC has. Where the position is uncertain (for example, the employee may have had untracked income elsewhere) HMRC prefers the non-cumulative approach to avoid issuing a large in-year refund that may need to be recovered later. Once the position is settled, HMRC issues a cumulative code that catches up with the correct year-to-date figure.
Fixing emergency tax: in-year and after the year-end
The fastest way to fix emergency tax in-year is to provide the missing information. For new starters, this means giving the employer the P45 from the previous job (or completing the new starter checklist if no P45 is available). For pension withdrawals, the P55, P53Z or P50Z forms recover the overpayment directly.
The personal tax account on GOV.UK is the simplest channel for most other corrections. Where HMRC needs to issue a new code to an employer or pension provider, the change can be requested online and is normally implemented within a few weeks.
If no action is taken, HMRC's automatic reconciliation after 5 April normally catches the overpayment. A P800 calculation is issued in the summer or autumn following the end of the tax year, with a refund paid by bank transfer or cheque. Self assessment taxpayers see the position dealt with through their tax return rather than by P800.
Disclaimer: This article is general information about emergency tax codes in the UK PAYE system. It is not personal tax advice. The right code, and the resulting tax, in any individual case depends on the specific income sources and HMRC's view of the position. Anyone unsure about their tax should check the personal tax account on GOV.UK or contact HMRC.
Frequently asked questions
What is the emergency tax rate?
There is no single emergency tax rate. Emergency tax is the tax produced by applying the emergency tax code (1257L on a Week 1 / Month 1 basis, or 0T where the personal allowance is used elsewhere). The actual deduction depends on the gross pay or pension payment and the rate bands.
Why is so much tax taken from my first pension withdrawal?
Pension providers must apply the emergency code on a Month 1 basis to a first flexible payment, because no proper tax code is held. The payment is treated as if it will be repeated every month, dragging much of it into the 40 percent and even the 45 percent bands. The overcharge is reclaimed using P55, P53Z or P50Z, normally refunded within around 30 working days.
How long does emergency tax usually last?
For an employee, emergency tax usually lasts until HMRC has issued a proper code to the employer, which is normally within a few weeks of the new starter information being processed. For a one-off pension withdrawal, the emergency code applies to the withdrawal itself and the overpayment is recovered separately.
Will I get the emergency tax back automatically?
HMRC reconciles each PAYE taxpayer's position after the end of the tax year. Where too much tax has been paid (because of emergency coding), HMRC issues a P800 calculation showing the refund due, normally in the summer or autumn following the year-end. Submitting a P55 / P53Z / P50Z form (for pension cases) or correcting the code in-year brings the refund forward.
Can I avoid emergency tax in the first place?
For new starters, providing a P45 from the previous job (or completing the new starter checklist) before the first pay date generally avoids emergency coding. For pension withdrawals, a small initial test withdrawal can prompt HMRC to issue a proper code to the pension provider before the main withdrawal is taken.
How we verified this
The structure of UK PAYE codes, the emergency tax code definition, and the use of cumulative versus Week 1 / Month 1 operation reflect HMRC's published Pay As You Earn manual and the Income Tax (Pay As You Earn) Regulations 2003. The treatment of pension flexibility payments, the use of forms P55, P53Z and P50Z, and the role of the personal tax account reflect current HMRC guidance and the quarterly pension flexibility statistics published by HMRC. Figures and processing timescales should be reconfirmed on GOV.UK.
