TL;DR: Tax code 1257L is the standard PAYE tax code used in the UK for most employees and pensioners in the 2026-27 tax year (and frozen at this level since 2021-22). The numbers 1257 represent a tax-free Personal Allowance of 12,570 pounds for the year, divided by 10 to form the code. The letter L indicates the basic Personal Allowance with no adjustments. When this code is operated on a "cumulative" basis, the employer or pension provider calculates the tax due from the start of the tax year, taking the year-to-date pay into account. When operated on a "Week 1 / Month 1" basis, each pay period is taxed in isolation. Tax code 1257L on its own is normally correct for one job or pension where the Personal Allowance is fully available against that source.
Last reviewed May 2026
UK tax codes are how HMRC tells an employer or pension provider how much tax to deduct from pay through the PAYE (Pay As You Earn) system. The code is a short string of numbers and letters that encodes the employee's tax-free Personal Allowance and any adjustments (for benefits in kind, untaxed income from other sources, or restrictions on the allowance).
This guide explains exactly what 1257L means, how the digits and letter break down, who normally gets the code, the difference between cumulative and Week 1 / Month 1 operation, what the code does (and does not do) for second jobs and pensions, and the steps to take if the code looks wrong.
The structure of a UK tax code
A standard PAYE tax code is a number followed by a letter. The number is the employee's tax-free Personal Allowance for the tax year, divided by 10. The letter is a suffix that indicates the type of allowance and any adjustments. For 1257L, the 1257 corresponds to a Personal Allowance of 12,570 pounds (1257 multiplied by 10 with an implied last digit), and the L indicates the standard Personal Allowance.
The Personal Allowance is the amount of income an individual can receive in a tax year without paying income tax. The Personal Allowance was frozen at 12,570 pounds in the 2021-22 tax year and the freeze has been extended through 2027-28, meaning the same 1257L code has been the standard for several years.
The letter L indicates the basic Personal Allowance without adjustments. Other letters carry different meanings: M and N for the Marriage Allowance transfer (the M recipient gets a higher allowance, the N transferor gets a lower one); K (where deductions exceed the allowance, the code is prefixed K and applied as additional taxable income rather than an allowance); BR (basic rate, all earnings taxed at 20 percent); D0 (higher rate, all earnings at 40 percent); D1 (additional rate); 0T (no allowance, code used when the employer has no information); and NT (no tax to deduct).
Who gets tax code 1257L
1257L is issued by HMRC to most employees and pensioners who have one main source of PAYE income and are entitled to the full Personal Allowance for the tax year. Most people in regular employment with no significant adjustments are on 1257L by default.
The code is allocated against the income source that HMRC treats as the main job or pension. An individual with one job receives 1257L against that job. An individual with two jobs or a job and a pension usually receives 1257L against the higher-paying source and BR or D0 against the secondary source, so that the Personal Allowance is not double-counted.
Self-employed people who have no PAYE income at all do not have a tax code in the PAYE sense; they handle income tax through Self Assessment and pay tax on their full self-employed profits (with the Personal Allowance applied automatically in the Self Assessment calculation).
Cumulative versus Week 1 / Month 1 operation
A cumulative tax code (1257L without any suffix or marker) tells the employer to calculate tax each pay period taking into account the year-to-date pay and the year-to-date allowance. If the employee underpaid tax in earlier months (because pay was higher than expected, for example), the cumulative calculation catches up automatically. If the employee overpaid, the cumulative calculation refunds the excess.
A Week 1 / Month 1 code (often written as 1257L W1, 1257L M1, or 1257L X) tells the employer to calculate each pay period as if it were the first pay period of the year, with no year-to-date catch-up. The Week 1 / Month 1 marker is added by HMRC where there is uncertainty about the year-to-date position (typically when changing jobs, or after a tax code change, to prevent a large unexpected refund or charge in the next pay period).
The Week 1 / Month 1 marker is usually removed in the following tax year, when HMRC issues a fresh code at the start of April. Until then, the employee should expect the tax deductions to be slightly different from what a cumulative calculation would produce. Any over- or underpayment is reconciled at the end of the tax year.
How tax is calculated under 1257L
Under 1257L, the employee's tax-free Personal Allowance of 12,570 pounds is divided across the pay periods of the year. On monthly pay, this is roughly 1,047.50 pounds of allowance each month. Pay above this threshold is taxed at the basic rate of 20 percent up to the basic-rate band limit, then at higher rates (40 percent and 45 percent) above the higher-rate thresholds.
The basic-rate band for 2026-27 is 37,700 pounds (so income from 12,570 to 50,270 pounds is taxed at 20 percent). The higher-rate band runs from 50,270 to 125,140 pounds at 40 percent. Above 125,140 pounds the additional rate of 45 percent applies. These thresholds are UK-wide for England, Northern Ireland and Wales; Scotland has its own income tax band structure for Scottish taxpayers.
An employee on a monthly salary of 3,000 pounds is therefore taxed roughly as follows: monthly allowance of 1,047.50 pounds (tax-free); the next 1,952.50 pounds (3,000 minus 1,047.50) at the basic rate of 20 percent, giving income tax of approximately 390 pounds. National Insurance is deducted separately at the relevant rates and bands.
What 1257L does not adjust for
1257L does not adjust for benefits in kind (company car, private medical insurance, fuel benefit). Where these are reported by the employer through the P11D process, HMRC normally amends the code to a lower number to collect the tax due on the benefit through PAYE. The amended code might look like 957L (Personal Allowance reduced by 3,000 pounds to collect tax on a 3,000 pound benefit).
1257L does not adjust for untaxed income from other sources (rental income, dividends above the dividend allowance, savings interest above the personal savings allowance, or self-employed earnings). Where HMRC is aware of such income, the code is reduced to collect the tax in PAYE. Where HMRC is not aware, the individual must declare the income on a Self Assessment tax return.
1257L also does not adjust for the High Income Child Benefit Charge or for the loss of the Personal Allowance for incomes above 100,000 pounds. Both of these are typically handled by tax code adjustments (the code reduced or moved to K) once HMRC is aware of the income level. Anyone whose income is approaching 100,000 pounds should check the code carefully.
Why your tax code might not be 1257L
Common reasons for a different code include: a second job (the secondary code is typically BR, D0 or D1); benefits in kind (reduced code such as 957L, 857L); the High Income Child Benefit Charge (further reduction); a Marriage Allowance transfer (M or N suffix); pension contributions outside payroll (usually adjusted in a Self Assessment, but can also be done by tax code amendment); unpaid tax from a previous year (a K-prefix code where deductions exceed the allowance); or a temporary emergency code at the start of new employment (1257L W1, BR or 0T).
Scottish taxpayers have a code prefixed with S (such as S1257L), and Welsh taxpayers have a code prefixed with C (such as C1257L). The prefix tells the employer to apply Scottish or Welsh income tax bands respectively. The Personal Allowance is the same UK-wide, but the bands and rates differ.
The starter checklist completed at the start of a new job determines the initial code applied by the new employer. If a P45 from the previous job is provided, the cumulative code can continue. If not, an emergency code applies until HMRC issues an updated code.
What to do if 1257L looks wrong
The first check is the Personal Tax Account on the HMRC website, which shows the current tax code, the reason for the code, and any adjustments. Most code issues can be resolved by updating the information in the Personal Tax Account (for example, removing a benefit that no longer applies or correcting an estimated income figure).
For more complex issues, an individual can contact HMRC by phone or webchat to query the code. HMRC typically resolves straightforward issues within a few weeks; a new tax code is issued and applied at the next pay period. Refunds for overpaid tax in the current year are usually given through the payroll once the code is updated; refunds for earlier years are processed separately.
If a code change does not happen in time for the end of the tax year and tax has been overpaid, HMRC issues a P800 calculation after the year-end showing the position and any refund due. The refund is paid by bank transfer or cheque. If tax has been underpaid, HMRC typically collects the underpayment through next year's tax code (adjusted down) rather than demanding a lump-sum payment.
How we verified this
This article reflects HMRC's published guidance on PAYE tax codes, the Income Tax Act 2007 for the Personal Allowance and tax bands, the Finance Act provisions extending the freeze on the Personal Allowance, the Scottish Parliament's income tax bands for Scottish taxpayers, and the Welsh Revenue position on income tax. Specific figures (the Personal Allowance, the band thresholds, the rates) are set each year and the linked GOV.UK pages hold the current values.
Disclaimer: This article is general information about UK tax codes and is not personal tax advice. Individual tax codes depend on personal circumstances and on the data HMRC holds. Anyone with concerns about a specific tax code should check the Personal Tax Account on the GOV.UK site and contact HMRC for a definitive answer.
Frequently asked questions
What does tax code 1257L mean?
Tax code 1257L means the employee or pensioner has the standard Personal Allowance of 12,570 pounds for the tax year, with no adjustments. The 1257 multiplied by 10 (with the trailing digit implied) gives the allowance amount; the L indicates the standard allowance. It is the most common tax code in the UK and is the default for someone with one job or pension and no benefits in kind or other adjustments.
Why has my tax code been 1257L for several years?
The UK Personal Allowance was frozen at 12,570 pounds in the 2021-22 tax year and the freeze has been extended through 2027-28. As a result, the same 1257L code has been the standard for several consecutive tax years. The code only changes if personal circumstances change (a new benefit in kind, a second job, a Marriage Allowance transfer, untaxed income reported to HMRC).
What does the L in 1257L stand for?
The L indicates that the employee or pensioner is entitled to the standard Personal Allowance, with no adjustment. Other letters mean different things: M and N for Marriage Allowance, K for negative allowance (deductions exceed the allowance), BR for basic rate, D0 for higher rate, NT for no tax, 0T for no allowance. The letter tells the employer how to apply the code in payroll.
What is the difference between 1257L cumulative and 1257L W1 / M1?
Cumulative 1257L calculates tax each pay period taking the year-to-date pay and allowance into account, so any over- or underpayment in earlier periods is corrected automatically. Week 1 / Month 1 (1257L W1 or M1 or X) calculates each pay period in isolation, as if it were the first period of the year. The Week 1 / Month 1 marker is usually applied temporarily after a tax code change and is removed at the next tax year.
Is 1257L the right tax code for me?
1257L is correct for most employees and pensioners with one main PAYE income source, the full Personal Allowance available, and no significant adjustments. It is not the right code if there is a second job or pension (which usually attracts BR or D0 against the second source), a benefit in kind, a Marriage Allowance transfer, untaxed income from other sources, or income approaching the 100,000 pound threshold where the Personal Allowance starts to taper.
