Tax Code 1257L Explained
What does tax code 1257L mean, and how does it affect your pay? A complete guide for 2026/27.
Based on published UK 2026/27 tax thresholds
People often search for "what does 1257L mean" or "UK tax code guide" after seeing it on their payslip for the first time. Tax code 1257L is the most common UK tax code, and this guide explains exactly what it means and how it affects your pay.
Breaking Down "1257L"
Personal Allowance
Personal Allowance
Other UK Tax Code Letters
| Letter | Meaning |
|---|---|
| L | Standard tax-free Personal Allowance (£12,570 for 2026/27) |
| M | Received 10% of partner's Personal Allowance (Marriage Allowance) |
| N | Transferred 10% of your Personal Allowance to your partner |
| T | Tax code includes other calculations, often requiring HMRC review |
| 0T | No Personal Allowance applied — full income taxed |
| BR | All income taxed at the basic rate (20%), no Personal Allowance |
| D0 | All income taxed at the higher rate (40%), often for a second job |
| D1 | All income taxed at the additional rate (45%) |
| K | Used when deductions (e.g. company benefits) exceed your allowance |
| W1 / M1 / X | Emergency tax codes, calculated non-cumulatively for one pay period |
How Tax Code 1257L Works in Practice
If you're on tax code 1257L and earn £30,000 per year, the first £12,570 is completely tax-free. The remaining £17,430 is your taxable income, taxed at the basic rate of 20%, giving an estimated Income Tax bill of around £3,486 per year.
This calculation happens automatically through PAYE — your employer applies your tax code to each payslip, spreading your Personal Allowance evenly across the tax year (so roughly £1,047.50 of allowance is applied each month).
What if I have more than one job?
Your Personal Allowance can usually only be applied to one job at a time. Your main job typically gets tax code 1257L, while a second job often gets BR (basic rate on all income) or another code, since HMRC assumes your main job already uses your full allowance.
What if my tax code looks different?
If your tax code has different numbers or letters, it usually means something about your circumstances differs from the standard situation — perhaps you have company benefits, owe tax from a previous year, or have multiple income sources. Check the table above, or contact HMRC if you're unsure.
Tax Code 1257L — FAQs
Tax code 1257L is the standard UK tax code for most people with one job and no untaxed income, benefits or company perks. The number 1257 represents a Personal Allowance of £12,570 (the number multiplied by 10), and the letter L indicates you're entitled to the standard tax-free Personal Allowance.
You'll usually have tax code 1257L if you have one job, are not claiming Marriage Allowance or Blind Person's Allowance, and don't have income that HMRC needs to collect tax on via your tax code (such as company benefits, untaxed interest, or owing tax from a previous year).
The letter L means you're entitled to the standard tax-free Personal Allowance, which is £12,570 for 2026/27. Other letters indicate different situations — for example, M means you've received a transfer of 10% of your partner's Personal Allowance (Marriage Allowance), and N means you've transferred 10% of your allowance to your partner.
Check your tax code on your latest payslip, P60 or P45. Compare it to what HMRC's online Check Your Income Tax service shows, or your Personal Tax Account on GOV.UK. If you have one job, no benefits and no other income, 1257L is likely correct. If something seems wrong, contact HMRC directly.
Emergency tax codes (such as 1257L W1, 1257L M1, or 1257L X) are used when HMRC doesn't have enough information about your income yet — often when starting a new job. They apply your Personal Allowance on a non-cumulative basis for that pay period only, which can sometimes result in too much or too little tax being deducted temporarily.
Yes. HMRC can update your tax code if your circumstances change — for example, starting a second job, receiving company benefits, owing tax from a previous year, or changes to your Personal Allowance. Always check your payslip if your tax code changes, and contact HMRC if you're unsure why.
If you're on the wrong tax code, you may pay too much or too little Income Tax. HMRC usually corrects this automatically over time, but you can also contact HMRC directly to query or correct your tax code, and may be entitled to a tax refund if you've overpaid.