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Emergency (month 1) codes give one month's allowance and one month's tax bands to a single payment, so lump sums get taxed as if repeated twelve times. Overpaid tax comes back via form P55/P53Z/P50Z for pension withdrawals (about 30 days) or automatically through later payslips in a job. England/NI bands; NI not included. Not tax advice.
What The Emergency Tax Calculator Works Out
- Emergency tax deducted: an emergency code (1257L on a month 1 basis) taxes each payment in isolation with one-twelfth of the personal allowance (GBP 1,047.50) and one-twelfth of each band (GBP 3,141.67 at 20%, then 40%, then 45%). A GBP 10,000 pension withdrawal loses nearly GBP 3,000 even for someone whose correct annual bill might be zero.
- You receive: the payment after emergency tax. National Insurance is not included; pension income carries none, and a first payslip would also have NI deducted.
- Getting it back: pension savers reclaim with form P55 (still taking income), P50Z (pot emptied, no other income) or P53Z (pot emptied, other income), repaid in around 30 days. In a job, the correct code arrives and cumulative PAYE claws the balance back through later payslips without forms.
- Why it stings: the system taxes the payment as if it will repeat every month for a year, which for a one-off is exactly wrong. A deliberate small first withdrawal to flush a proper code through before the real one is the practitioners' standard move.
- Tax-free part (advanced): a pension lump sum taken as an uncrystallised funds lump sum includes 25% tax-free cash, so only 75% is taxed. Set 25% to see the real deduction on a UFPLS payment.
- Other taxable income this year (advanced): your salary, state pension or other pension income for the tax year. The calculator works out what the payment should really cost on a full-year cumulative basis, including the personal allowance taper above GBP 100,000.
- Correct tax and likely refund (advanced): the difference between the emergency deduction and the correct full-year tax is the refund to claim, or occasionally an underpayment if your other income already uses up the lower bands.
- Emergency code basis (advanced): weekly paid workers get a W1 code with one fifty-second of the allowance and bands instead of one twelfth, which bites harder on a lump sum.
- Effective emergency rate (advanced): the deduction as a share of the whole payment, against the rate the correct full-year sum produces.
- Codes to look for: W1, M1 or X on a payslip mark the non-cumulative basis; their disappearance marks the refund. Not tax advice.
Source and further reading: GOV.UK (HMRC): claim a tax refund.