by Asim Abbas
11 November 2026 
What does your tax code mean? 1257L, 0T, BR and K codes decoded
What does your tax code mean? 1257L, 0T, BR and K codes decoded
Your tax code tells your employer or pension provider how much tax to take from your pay. If it’s wrong, you could be paying too much, or too little and face a bill later.
- The number × 10 is your tax-free pay for the year
- 1257L is the standard code for 2026/27
- A prefix of S means Scottish rates, C means Welsh
- Emergency codes end in W1, M1 or X
Most people never look at it, but it only takes a minute to check.
This guide explains how tax codes work, what each letter means and what to do if yours looks wrong.
How tax codes work
The number in your code, multiplied by 10, is roughly how much you can earn tax-free in the tax year. So 1257L means £12,570, the standard personal allowance. The letter tells your employer about your situation.
What the letters mean
| Code | What it means |
|---|---|
| L | Standard tax-free personal allowance |
| M | You receive Marriage Allowance from your partner |
| N | You transfer Marriage Allowance to your partner |
| T | HMRC needs to review items in your code |
| BR | All income from this job taxed at 20%, often a second job |
| D0 / D1 | All income taxed at 40% / 45% |
| 0T | No personal allowance on this job |
| NT | No tax taken from this income |
| K | Deductions are more than your allowance |
S and C prefixes
An S at the start means you pay Scottish income tax rates. A C means you’re a Welsh taxpayer. Welsh rates are the same as England’s for 2026/27, but the code should still start with C if you live in Wales.
Tax code checker
Enter your code to see what it means and what tax it takes.
Emergency tax codes
If your code ends in W1, M1 or X, you’re on an emergency code. Each pay period is taxed on its own, so you may overpay, especially after starting a new job without a P45. It usually corrects itself once HMRC updates your record, and any overpayment comes back through payroll.
K codes
A K code means you have untaxed income or benefits that are worth more than your allowance, such as a company car or unpaid tax from an earlier year. The amount is added to your taxable pay. Your employer can’t deduct more than half your pay in tax in any period.
On a £35,000 salary with code 1257L, Income Tax is about £4,486 for the year. On code 0T, all £35,000 is taxable, so you’d pay about £7,000 before any correction, roughly £2,514 too much.
Fixed-fee accountancy support
Transparent monthly packages for sole traders, landlords and limited companies. Fixed fees agreed upfront, VAT included.
Get a fixed-fee quoteCall 0161 531 4179How to check and fix your code
- Find your code on your payslip, P60 or HMRC app
- Use our free tax code checker to see what it means
- If it looks wrong, update your details in your personal tax account or contact HMRC
- Overpaid tax is normally refunded through payroll or by a P800 calculation after the year ends
Employers can find payroll help on our payroll services page.
What should I do next?
Payslip, P60 or the HMRC app.
Does it match your situation?
Through your personal tax account.
Our tax team can deal with HMRC for you.
Frequently Asked Questions
What is the standard tax code for 2026/27?
1257L. It gives the standard £12,570 personal allowance, which is frozen until 2031.
Why has my tax code changed?
Common reasons include a new job, a benefit in kind, Marriage Allowance, unpaid tax from a previous year or income over £100,000.
Will I get overpaid tax back?
Yes. It usually comes back through payroll once your code is corrected, or HMRC sends a P800 refund after the tax year.
What does BR mean on a second job?
All pay from that job is taxed at 20%, because your personal allowance is used by your main job.
Can my tax code collect Self Assessment tax?
Yes. If you owe less than £3,000 and file online by 30 December, HMRC can collect it through your code.
Need help with this? Wingate Accountants offers fixed-fee online accountancy support across the UK. Call 0161 531 4179 or request a quote at wingateaccountants.co.uk.
About the Author
Stephen Reynold
I’m Stephen Reynold, an accountant at Wingate Accountants. I work with sole traders and small companies, turning tax rules into clear, practical next steps.
