Tax code guide: 2026/27

UK Emergency Tax 2026/27: Why You're Overpaying + How to Get a Refund

Complete guide to UK emergency tax codes (1257L W1/M1/X, BR variants) for 2026/27. Why HMRC put you on emergency tax, how much extra you're paying each month, when you'll get refunded automatically, and the 3 ways to claim immediately. Real worked examples for new-job, second-job, pension drawdown and returning-from-abroad scenarios.

What "emergency tax" actually means

Emergency tax in the UK is shorthand for being on a non-cumulative tax code — typically 1257L W1 (weekly), 1257L M1 (monthly), or 1257L X (either). The "W1 / M1 / X" suffix means each pay period is taxed in isolation, NOT against your cumulative year-to-date pay and unused Personal Allowance. The actual rates are identical to the standard 1257L code (20% basic to £50,270, 40% higher to £125,140, 45% additional above). You still get the £12,570 Personal Allowance for the year — just divided into 1/52 or 1/12 chunks per pay period under the emergency code.

The problem is cash-flow: unused PA from earlier in the year cannot offset later pay, so the tax taken in any single period can be much higher than the cumulative figure you actually owe by 5 April. Once HMRC has enough year-to-date information (typically 4-8 weeks after starting the new job or completing a Starter Checklist), they issue a corrected cumulative 1257L code, your employer applies it on the next pay run, and any over-collected tax flows back to you via your next payslip — often a meaningful one-off boost.

The five common triggers for emergency tax are: starting a new job without a P45, returning from abroad, beginning a pension drawdown, taking a second job, or completing a Starter Checklist with Statement B or C ticked. None of these is HMRC "punishing" you — the emergency code is a safety net to avoid systematic under-collection of tax while HMRC reconciles your record. Misnaming is also common — "BR code" (Basic Rate, no PA) is often called emergency code but technically only 1257L W1/M1/X qualifies. BR is used when HMRC KNOWS this is a second income, not when they're missing data.

Worked example - new job mid-year

Scenario: you take a new £40,000 / year job starting in October (7th month of the UK tax year). Previous 6 months you had no income. HMRC assigns you 1257L M1 emergency code because they don't yet have your P45 / Starter Checklist confirming no other current income.

Component	Under 1257L M1 (emergency)	Under 1257L (standard cumulative)
Months worked	6 (Oct-Mar)	6 (Oct-Mar)
Annual salary equivalent	£40,000	£40,000
Earned in tax year	£20,000	£20,000
PA applied	£1047.50 per month × 6 = £6,285	Full £12,570 (covers all earnings)
Taxable per month	£2,286	£0 (all under cumulative PA)
Tax deducted in the 6 months	£2,743	£1,486
Cash-flow over-collection	£1,257 (refund due via P800 reconciliation)

The full annual reconciliation typically arrives by P800 letter June-November following the tax year. You can accelerate by signing into your Personal Tax Account (gov.uk/personal-tax-account) and requesting a refund directly — typically credited within 5-10 working days.

Three routes to claim your refund

Route 1 — Personal Tax Account (fastest, recommended)

Go to gov.uk/personal-tax-account and sign in via Government Gateway. Click "Tax estimate" — if HMRC shows an overpayment you can request a refund directly. Refund typically processed within 5-10 working days. Works best if you have already finished the emergency-coded employment OR HMRC has issued the corrected cumulative code on your record. Free, no paperwork.

Route 2 — Phone HMRC for in-year code correction

Call 0300 200 3300 (Monday-Friday 8am-6pm; lowest queue 8-9am or after 4pm). Have your National Insurance number, employer's PAYE reference (top of your payslip), and prior-employer P45 details ready. Request "tax code correction from emergency M1 to cumulative 1257L". HMRC issues a coding notice to your employer (typically within 2 weeks). Your next payslip applies the corrected code and the refund of over-collected tax flows through that payslip — often a meaningful one-off month-end boost.

Route 3 — Form-based claim (for specific situations)

Form P50 — if you've stopped working partway through the tax year (e.g. retired, taking long break, moving to non-employment income) and want the unused PA refunded before year-end.
Form P55 — first flexibly-accessed pension payment, lump-sum drawdown.
Form P53Z — taken all of pension and not earning.
Form P50Z — taken all of pension and continuing to earn.
Form P85 — leaving the UK partway through a tax year.

All forms available at gov.uk. HMRC processes typically within 30-90 days of receipt. Use the specific form rather than waiting for P800 if you have a specific trigger (pension lump-sum, leaving UK) — the targeted forms move faster than annual reconciliation.

How to avoid emergency tax on your next job

Get a P45 from your previous employer before starting the new role. The P45 has Year-to-Date pay, tax, current tax code — give Parts 2 and 3 to your new employer on or before your first day. This is the single biggest preventive action.
Complete a Starter Checklist correctly if no P45 is available (first job, returning from gap, returning from abroad). The Checklist asks 3 employment-status questions. Tick Statement A ("This is my first job since 6 April and I have not received jobseekers allowance, employment and support allowance, taxable incapacity benefit, state pension or occupational pension") to receive 1257L cumulative from day one. Ticking Statement B triggers 1257L M1 (emergency); Statement C triggers BR (Basic Rate, no PA).
Pre-emptively call HMRC before starting if you have unusual circumstances (returning expat, transition from self-employment to PAYE, etc). HMRC can pre-authorise a cumulative 1257L if you provide your new employer's PAYE reference and confirm employment status.
For pension drawdown — speak to your provider about phasing the first withdrawal. A small "test" payment in month 1 (e.g. £100) triggers HMRC to issue a correct cumulative code before you take the bulk lump sum, avoiding the emergency-code over-deduction on a large initial payment.
Verify your code on the first payslip and challenge immediately if it's W1/M1/X or BR when it shouldn't be. Don't wait for the year-end reconciliation if the error is obvious.

Frequently asked questions

What is an emergency tax code?

An emergency tax code is a non-cumulative version of the standard tax code (typically 1257L W1, 1257L M1, or 1257L X). HMRC uses it when they don't have enough year-to-date information to calculate your tax cumulatively. The W1 / M1 / X suffix means "weekly", "monthly", or "either" — and signals that each pay period is taxed in isolation, NOT against your cumulative year-to-date pay and unused Personal Allowance. The actual tax rates are the same as the standard 1257L code (20% basic / 40% higher / 45% additional), and you still get 1/52 or 1/12 of your £12,570 Personal Allowance applied each period. The problem is cash-flow: unused PA from earlier in the year cannot offset later pay, so the tax taken in any single period can be much higher than the cumulative figure you actually owe by 5 April.

Why am I on an emergency tax code?

Five common reasons HMRC puts you on emergency tax. (1) New job without a P45: you started a new role and your previous employer hasn't sent HMRC your P45, or you didn't complete a Starter Checklist (DWP form HMRC starter declaration) — HMRC defaults to 1257L M1 until they reconcile. (2) Returning from abroad: extended period as non-UK-resident, your old tax code is stale, HMRC assigns 1257L M1 while they verify your residence status. (3) Second job: HMRC sometimes initially applies M1 then switches to BR (basic rate, no PA) once they realise it's a second income. (4) Drawing a pension for the first time: pension provider receives 1257L M1 as the default emergency code from HMRC. (5) Starter Checklist Statement C ticked ("I have another job or receive a pension"): HMRC applies BR or 1257L M1 depending on circumstances. The emergency code is a safety net to avoid underpayment, not a punishment — and HMRC reconciles within 30-90 days of receiving full information.

How much extra tax am I paying on emergency code?

Depends on when in the tax year you started the new income source. If you start a new job in October (month 7 of the tax year) on a £40,000 salary with 1257L M1 emergency code, you receive £3,333.333 gross per month. Each month deducts: gross £3,333.333 - PA share £1047.50 = £2285.83 taxable × 20% = £457.17 tax. Over the 6 months Oct-Mar that's £2743 of tax deducted. Under standard 1257L cumulative code, HMRC would recognise the 6 months of unused PA from Apr-Sep (£6285 of unused allowance), giving an effective annual PA of £12,570 applied against only £20,000 of earnings. Annual tax = £1486 (because total income £20,000 sits mostly within the £12,570 PA). Cash-flow overpayment during the tax year: roughly £1257 that you should get back via the year-end reconciliation P800 letter or by claiming.

Will I automatically get my emergency tax refund?

In most cases yes — HMRC reconciles tax annually after 5 April using all employers' P60 and P45 returns. If you overpaid, HMRC sends a P800 calculation letter typically between June and November after the tax year ends. The letter shows the refund due and asks you to claim it via the Personal Tax Account on gov.uk (refund arrives by bank transfer in 5-10 working days) or via cheque if you don't claim online within 30 days. However: P800 reconciliation can be slow and sometimes inaccurate. You can accelerate by claiming directly. If you're still in the same job and HMRC fixes your code mid-year (typically by issuing a cumulative 1257L after receiving prior-job P45), the in-year reconciliation gives you the refund through your next payslip — often a meaningful boost in the month the code is corrected.

How do I claim an emergency tax refund manually?

Three claim routes. (1) Personal Tax Account (gov.uk/personal-tax-account) — fastest. Sign in via Government Gateway, check "Tax estimate", and if HMRC shows an overpayment you can request a refund directly. Refund typically processed within 5-10 working days. Best route if you finished the relevant employment or pension. (2) During current employment: contact HMRC by phone (0300 200 3300) and request a tax code correction. HMRC sends a coding notice to your employer (typically within 2 weeks); your employer applies the corrected cumulative 1257L on the next pay run, which automatically refunds the overpaid tax via the payslip. (3) Form P85 (leaving UK) or Form P50 (claiming refund after leaving job before tax year end). Both available at gov.uk. The P50 specifically handles cases where you've stopped working partway through a tax year and want the unused PA refunded before the year ends.

What is the difference between emergency tax code and BR code?

Emergency code (typically 1257L W1/M1/X) gives you 1/52 or 1/12 of your £12,570 Personal Allowance per pay period — you still get SOME tax-free allowance, just not cumulative. BR code (Basic Rate, no number) gives you NO Personal Allowance at all — every pound of pay from that employer is taxed at 20% from the first £1. HMRC uses BR when they know this employment is a SECOND or LATER income (your PA is already used at the main employer), so it's not "emergency" — it's deliberate allocation. Common confusion: people call BR "emergency code" but technically only 1257L W1/M1/X qualifies. If you're on BR and shouldn't be (e.g. it's your only income and you should have full PA), you need to fix the coding immediately because every payday on BR overcollects ~£210 of tax that should have been allowed.

How do I avoid emergency tax on my next job?

Three pre-emptive steps that almost always prevent emergency coding. (1) Get a P45 from your previous employer before starting the new role. The P45 has your year-to-date pay, tax, and current tax code — give Part 2 and Part 3 to your new employer on or before your first day. (2) If no P45 (first job, returning from gap, returning from abroad), complete a Starter Checklist (formerly P46) on or before the first payday. The Starter Checklist asks 3 questions about your employment status that determine which code your new employer initially applies — Statement A (only job, no other income) → 1257L cumulative, Statement B (this is now your only job but had previous income this year) → 1257L M1 emergency, Statement C (another job or pension) → BR. Statement A is the cleanest route for someone with no other current income. (3) If you've already started on emergency code, accelerate the fix by calling HMRC (0300 200 3300) with your new employer's PAYE reference — they can issue a coding notice within days.

Can I be on emergency tax and overpaying at the same time as overpaying via a second job?

Yes — and it's a common painful scenario. If you have two jobs, both employers typically deduct tax assuming they're your only employer. Without HMRC coordination, both might apply 1257L (giving you the £12,570 PA twice) AND your combined income might push into higher rate. HMRC eventually reconciles via P800 but in the meantime your monthly tax might be LOWER than it should be (giving a year-end UNDERPAYMENT bill), or HIGHER if HMRC put you on BR at the second job + emergency code at the first. The mess is fixable by calling HMRC with both employers' PAYE references and asking them to allocate the PA correctly — typically full PA at the higher-paid job (1257L cumulative), BR at the secondary job (so the secondary's earnings are fully taxed at 20% from pound one, recognising the PA is used elsewhere).

Will I be on emergency tax if I start drawing a pension?

Yes — the FIRST month of pension drawdown is almost always taxed under emergency code 1257L M1, even if it's your only income. The pension provider receives no prior-year tax information from HMRC at the point you start drawdown — they default to emergency code. The impact can be substantial for a lump-sum withdrawal. A £30,000 lump-sum drawn in month 1 of pension under 1257L M1 is taxed as if you'll earn £30,000 × 12 = £360,000 annually, putting most of it into the 40% and 45% bands. You can over-pay £6,000-£10,000 of tax on a single £30k drawdown that should have been taxed at 20% if drawn across a tax year. Fix: claim immediately via Form P55 (if you've made a flexibly-accessed pension payment), Form P53Z (if you've taken all of your pension and not earning), or Form P50Z (similar). HMRC processes within 30-90 days. Specialist pension drawdown providers (AJ Bell, Vanguard, Hargreaves Lansdown) often warn customers about this BEFORE the first withdrawal and suggest small "test" draws to trigger HMRC code adjustment before the bulk lump sum.

How long does HMRC take to fix emergency tax?

Typical timelines: (1) New job mid-year with P45 submitted: HMRC issues corrected cumulative 1257L typically within 4-6 weeks. Your employer applies it on the next pay run; refund of any over-collected tax flows through the next payslip. (2) New job without P45 + Starter Checklist Statement A: same 4-6 weeks. (3) New job, no P45, no Starter Checklist: HMRC waits until they receive your employer's RTI (Real Time Information) submission for at least 1-2 months before issuing a code change — total 8-12 weeks. (4) Returning expat: depends on HMRC's residence team reviewing your record — 8-16 weeks typical. (5) First-pension drawdown: HMRC takes ~12-16 weeks via automatic reconciliation, OR 4-8 weeks if you file P55/P50Z/P53Z immediately. Annual end-of-year reconciliation: P800 letters typically sent June-November after the tax year ends. Specialist tax advice if HMRC hasn't fixed within 6 months despite multiple contacts.

What is the "emergency tax number"?

HMRC contact number for tax code queries: 0300 200 3300 (Monday-Friday 8am-6pm). This is the main Income Tax helpline — it's the right number for emergency tax code corrections, coding queries, PAYE issues. For a faster resolution, sign in to the Personal Tax Account at gov.uk/personal-tax-account first to verify your current tax code, your year-to-date pay/tax position, and check whether the system has already recognised the overpayment. About 70% of emergency tax issues can be resolved entirely through the Personal Tax Account without phoning. The phone helpline is most useful for: (a) initial code-change requests when starting a new job mid-year, (b) cases where HMRC hasn't auto-corrected after 6+ weeks of P45 / Starter Checklist submission, (c) complex cases (multiple jobs + pension + lump sum). Plan to call early morning (8-9am) for shortest queue times.

Does emergency tax affect Personal Allowance or higher-rate band?

No — emergency tax doesn't change WHICH tax bands or allowances apply, only the CUMULATIVE vs PER-PERIOD calculation mechanic. You still get the £12,570 Personal Allowance for the full tax year (just divided 1/52 or 1/12 per period under M1 emergency code). You still get the £37,700 basic-rate band followed by higher rate at 40% from £50,270, etc. The full year reconciliation is identical to standard 1257L — same bands, same rates, same allowances. The cash-flow squeeze during the tax year is the only real cost (assuming HMRC reconciles correctly within a year). The £100,000 Personal Allowance taper, additional-rate threshold £125,140, HICBC £60,000-£80,000 — all apply identically. Emergency code is purely a calculation timing mechanism, not a different tax regime.

Emergency tax code 1257L W1/M1/X explainer - detailed code-specific breakdown.
BR (Basic Rate) tax code explainer - the "no Personal Allowance" code commonly confused with emergency.
0T tax code explainer - the strictest non-allowance code.
1257L tax code meaning - the standard cumulative code.
All UK tax codes - full index of tax-code suffixes and meanings.
Salary calculator - PAYE take-home with cumulative code applied.
Pension drawdown calculator - factor in first-month emergency tax on lump-sum withdrawals.
Two-jobs calculator - PA allocation across multiple employments.
Personal Allowance guide - the £12,570 underlying allowance.