Tax code2 min read · Updated 19 October 2026
Tax code 1257L explained: what it means and how to check yours
Tax code 1257L is the standard UK code. Here is what the numbers and letter mean, what other codes tell you, and how to check yours is right.
What 1257L means
The digits show your tax-free allowance divided by 10. So 1257 means £12,570. The letter L means you get the standard allowance. Most people with one job and no other income have this code.
Other codes you may see
BR taxes all pay at 20%. D0 taxes all pay at 40%. 0T gives no allowance. K codes add to your pay before tax, often because of benefits or tax owed. S in front means Scottish rates. C means Welsh rates.
When your code may be wrong
Common causes are a new job where your employer has only an emergency code, company benefits, untaxed income such as savings interest, or tax owed from an earlier year. On a £40,000 salary, the standard code gives about £2,693 a month take-home.
How to check and fix it
Look at your payslip or sign in to your HMRC personal tax account. If it looks wrong, tell HMRC. They send your employer a new code. Do not ask your employer to change it themselves.
Common questions
What does 1257L mean?
It is the standard code. £12,570 of your yearly pay is tax-free.
Is 1257L the correct tax code?
For most people with one job, yes. If you have benefits, other income or owe tax, your code can differ.
What is an emergency tax code?
A temporary code ending W1, M1 or X. It taxes each pay period alone. HMRC should replace it once it has your details.