The 1257L Tax Code Explained.

How much tax will I pay on 1257L?

Use the interactive tool below to see how the 1257L tax code impacts different salary levels. This calculation includes Income Tax and National Insurance for the 2026/27 tax year.

Is the 1257L tax code right for me?

Tax codes are assigned by HMRC based on your reported income and circumstances. You might be on 1257L if:

• This is your primary source of employment income.
• HMRC has recently updated your record following a change in benefits.
• You have started a new job and your previous P45 has been processed.

If you believe this code is incorrect, you should contact HMRC as soon as possible to avoid overpaying or underpaying tax.

How does the 1257L tax code affect my take-home pay?

The 1257L tax code gives you a £12,570 personal allowance. This means the first £12,570 you earn each year is completely tax-free. Any income above this is taxed according to the standard UK tax bands. For example, if you earn £25,000, you only pay income tax on £12,430 of it.

Why did HMRC give me the 1257L tax code?

There are three main reasons HMRC issues the 1257L code. First, if you have started a new job and your P45 was processed successfully without any outstanding underpayments. Second, it is the standard default code assigned automatically at the start of a new tax year if your circumstances haven't changed. Third, HMRC has not detected any special circumstances like company cars, medical insurance, or untaxed income that would require adjusting your allowance.

What does the number 1257 mean in my tax code?

The number 1257 represents the £12,570 personal allowance. HMRC's system simply removes the last digit of your allowance amount. So £12,570 becomes 1257. If you had an allowance of £13,000 due to claiming uniform expenses, your number would be 1300.

What does the L mean in 1257L?

The letter L indicates you are entitled to the standard tax-free personal allowance. Other common suffixes you might see over your career include M (which means you've received a transfer of 10% of your partner's personal allowance via the Marriage Allowance), N (meaning you transferred 10% of your allowance to your partner), and T (meaning HMRC needs to review other calculations before assigning your code).

How is 1257L different from other UK tax codes?

While 1257L gives you a tax-free allowance, many other codes do not. For example, a BR code gives no allowance at all, taxing everything at a flat 20% basic rate. The 0T code also gives no allowance but applies graduated rates (20%, 40%, 45%) based on your earnings. D0 means all your income from that job is taxed directly at 40%.

What to do if you think your 1257L code is wrong

First, carefully check your latest payslip to confirm 1257L is currently active. Next, log into your Personal Tax Account on the HMRC website at tax.service.gov.uk to see how they calculated it. If you still believe it's incorrect because you have untaxed income or have changed jobs, you must contact HMRC directly on 0300 200 3300. You can read our full guide on how to fix a wrong tax code here.

Frequently asked questions about the 1257L tax code

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