How to read 1257L
The number in a tax code normally reflects the amount of tax-free income available after adjustments, with the final digit removed. The letter L generally indicates entitlement to the standard Personal Allowance.
Your employer uses the code supplied by HMRC. A code can change when benefits, untaxed income, an earlier underpayment or another job affects the allowance allocated to this employment.
When should you check it?
Check the code when starting a new job, after receiving a taxable workplace benefit or when you have more than one income source. Compare the payslip code with the latest HMRC notice rather than assuming an older payslip remains current.
A code such as BR, D0 or 0T works differently from 1257L. The correct code depends on your complete circumstances, so a calculator can explain the instruction but cannot replace HMRC’s record.
What to do next
Use our checker for a plain-English explanation, then use the take-home calculator to see an annual estimate. If the code or HMRC income estimate is wrong, update your details through HMRC or contact them directly.
Frequently asked questions
Which rules and data does this guide use?
It uses this period: Current UK rules and published data at the last reviewed date. Check the published and updated dates above, because thresholds and rates can change.
Is the result guaranteed?
No. Examples and calculator results are estimates. Your actual position can differ because of your tax code, benefits, deductions, location and personal circumstances.
Sources
External links open the official source used to review this guide.