TL;DR: The 1257L tax code is the standard PAYE code for most UK employees and pensioners. The number 1257 represents the standard personal allowance of 12,570 pounds (the number multiplied by 10). The L suffix means the standard personal allowance applies for tax purposes and the code is operated normally. The personal allowance is divided across the tax year, so a monthly-paid employee gets one twelfth of 12,570 pounds tax-free each month. The personal allowance is reduced for high earners (above 100,000 pounds adjusted net income) and removed entirely above 125,140 pounds. The 1257L code has been in use since the 2021 to 2022 tax year, since when the personal allowance has been frozen at 12,570 pounds.
Last reviewed May 2026
1257L is the most common UK PAYE tax code. It applies to anyone with a single source of PAYE income who is entitled to the standard personal allowance and has no special adjustments to their tax position. For most employees and pensioners, 1257L is what shows on the payslip every month. The code has been the standard since the 2021 to 2022 tax year, when the personal allowance was raised from 12,500 pounds to 12,570 pounds.
The code is built up of two parts: a number and a letter. Together they tell the employer or pension provider exactly how to calculate the income tax to deduct each pay period. Reading the code correctly is the first step to checking that the right amount of tax is being paid.
This guide explains what each part of 1257L means, how the code is operated, the situations in which the code changes, and how to check that the right code is being applied.
What 1257L tells the employer
The number 1257 represents 12,570 pounds, which is the standard personal allowance for the tax year. The relationship between the number and the allowance is straightforward: the number multiplied by 10 gives the annual tax-free allowance.
The L suffix means the taxpayer is entitled to the standard personal allowance for the tax year, with no special restrictions or adjustments. The L code is operated cumulatively, meaning the employer recalculates the year-to-date tax position at each pay date.
For a monthly-paid employee, the practical result is that one twelfth of the personal allowance (1,047.50 pounds) is tax-free each month. Pay above that figure is taxed at the relevant rate band: 20 percent up to one twelfth of the basic rate band, 40 percent above that up to one twelfth of the higher rate band, and 45 percent above that.
How cumulative operation works
A cumulative tax code looks at the year-to-date pay and tax at each pay date and works out what should have been paid in tax up to that point. The deduction in the current pay period is whatever brings the year-to-date tax to the right cumulative figure. This automatic catch-up means that a small change in pay (for example, a one-off bonus) is corrected within a pay period or two.
The cumulative approach is also what allows new starters to pick up unused personal allowance from earlier in the year. An employee starting a new job in October on a cumulative 1257L code, having had no other income since 6 April, would normally get a refund of the unused allowance from April through to October on their first pay packet.
The opposite of cumulative is non-cumulative, often called Week 1 / Month 1 (and sometimes shown as W1, M1 or X after the code). Non-cumulative codes treat each pay period separately, ignoring the year-to-date position. They are used as a temporary measure where HMRC wants to avoid issuing a large refund or tax bill in a single pay period until the position is settled.
The personal allowance and how it changes
The personal allowance was 12,570 pounds for 2021 to 2022 and has remained at that level in subsequent tax years. It was frozen by the government in the Spring Budget 2021 and the freeze has been extended at successive fiscal events. The current freeze position should be checked on GOV.UK as fiscal events can change it.
The personal allowance is reduced for high earners. For every 2 pounds of adjusted net income above 100,000 pounds, the allowance is reduced by 1 pound. By 125,140 pounds the allowance has been reduced to zero. Someone in this income range has a tapered allowance and HMRC may issue a different code (for example, 0T) to reflect the reduced or zero allowance.
Other items that can change the personal allowance include the marriage allowance, where 10 percent of one partner's allowance is transferred to the other. The recipient's code has an "M" suffix; the giver's has an "N" suffix. The number changes accordingly.
When 1257L will not be the right code
1257L assumes a single source of PAYE income, no taxable benefits in kind, no untaxed income, no underpayments from previous years and no special adjustments. Where any of those apply, HMRC issues a different code.
Common variants include K codes (where deductions exceed allowances, producing a negative allowance), L codes with adjusted numbers (1263L for someone with a small expense allowance, 1100L for someone with a benefit in kind reducing the allowance), 0T (no allowance), BR (basic rate on all pay from this source), D0 (higher rate on all pay), D1 (additional rate on all pay), and NT (no tax).
For someone with multiple PAYE sources, HMRC normally allocates the personal allowance to the largest source (using 1257L or a tapered L code) and applies BR or 0T to the others. The taxpayer can request a different split between sources through the personal tax account if it suits their situation better.
Reading the payslip
The tax code shown on the payslip should match the code HMRC has issued. If the employer's code is different from HMRC's most recent notification, the payroll department should be asked to update. Employers can only apply the code HMRC has sent them; they cannot issue or change a tax code on their own initiative.
Each payslip shows the gross pay, the tax code applied, the tax deducted in the period, the National Insurance deducted, and the year-to-date totals. For a 1257L code, the cumulative year-to-date tax should be roughly proportional to the year-to-date pay above the cumulative tax-free allowance, given the appropriate rate bands.
Where the figures look wrong (for example, the tax appears too high or too low), the personal tax account on GOV.UK shows what HMRC believes the position to be. Discrepancies can be queried with HMRC and a corrected code issued where appropriate.
What to do if the code looks wrong
Three checks settle most queries. First, does the code reflect the right personal allowance? 1257L is the standard; if the code has an unusually low number, that suggests deductions have been made for benefits in kind, untaxed income or previous-year underpayments. The personal tax account shows the breakdown.
Second, is the code being operated on the right basis? A cumulative code (no W1/M1/X marker) will deal with mid-year changes naturally. A non-cumulative code can produce a one-off mismatch that is reconciled later. Asking HMRC to switch to cumulative once the position is clear can speed up an in-year refund.
Third, are all relevant changes reported? A change of job, the start or end of a benefit in kind, a new private pension, or a marriage allowance election should be reported promptly so the code reflects the position. The personal tax account is the simplest channel for most changes.
Disclaimer: This article is general information about the 1257L tax code. It is not personal tax advice. Tax codes are set by HMRC based on individual circumstances, and the right answer in any individual case depends on the specific allowances, benefits and reliefs that apply. Anyone unsure about their code should check the personal tax account on GOV.UK or contact HMRC.
Frequently asked questions
What does the 1257L tax code mean?
1257L gives an annual tax-free personal allowance of 12,570 pounds and applies the standard cumulative PAYE calculation. The number represents the personal allowance in tens of pounds, and the L suffix means the standard allowance applies with no special restrictions.
How much tax-free pay do I get on 1257L?
12,570 pounds for the tax year, equivalent to one twelfth of that figure (1,047.50 pounds) per month for a monthly-paid employee, or one fifty-second per week for a weekly-paid employee. Pay above the cumulative tax-free allowance is taxed at the basic rate, then the higher rate, then the additional rate as appropriate.
Why is my code 1257L if I earn over 100,000 pounds?
If your adjusted net income exceeds 100,000 pounds, your personal allowance should be tapered (reduced by 1 pound for every 2 pounds of excess), reaching zero by 125,140 pounds. If you are still on 1257L despite high income, HMRC may not have been notified; the personal tax account is the simplest way to update the position. A different code (such as 0T) is normally issued to reflect a tapered or zero allowance.
What is the difference between 1257L and 1257L W1/M1?
1257L is operated cumulatively, recalculating the year-to-date position at each pay date. 1257L W1/M1 (or X) is operated non-cumulatively, treating each pay period separately. The W1/M1 version is used as a temporary measure where HMRC wants to avoid issuing a large in-year refund or charge until the position is settled.
Will the 1257L code change in the next tax year?
HMRC reviews tax codes at the start of each tax year. If the personal allowance changes, the code number changes accordingly (so 1257L would become a different number). The personal allowance has been frozen at 12,570 pounds for several years; the freeze position should be checked at the time of any decision.
How we verified this
The structure of UK tax codes, the meaning of suffixes, and the use of cumulative versus Week 1 / Month 1 operation reflect HMRC's published Pay As You Earn manual and the GOV.UK guidance on tax codes. The 12,570 pound personal allowance and the freeze in successive Budgets are taken from the published Income Tax rates and allowances on GOV.UK and the relevant Finance Acts. The personal allowance taper above 100,000 pounds reflects section 35 of the Income Tax Act 2007. Figures should be reconfirmed on GOV.UK as they can change at fiscal events.
