๐Ÿ‡ฌ๐Ÿ‡ง UK ยท 2026/27 Tax Year ยท Free

Tax Code Checker

Don't let HMRC keep money that belongs to you. Enter your tax code below to find out exactly what it means and whether you might be overpaying.

Quick reference โ€” common UK tax codes

Why checking your tax code is important

Your tax code tells your employer how much tax-free income you are entitled to in the current tax year. If it's wrong, you are either paying too much tax or building up a tax debt that HMRC will eventually ask you to repay.

Millions of UK workers are on the wrong tax code every year. The most common mistakes happen when you change jobs, have more than one source of income, or receive taxable company benefits (like a company car or health insurance).

What if my tax code is wrong?

Your employer cannot change your tax code just because you ask them to โ€” they must receive an official coding notice from HMRC.

To fix it, you need to contact HMRC directly. The easiest way is to log into your Personal Tax Account on gov.uk. You can view how HMRC has calculated your code and update your estimated income. Alternatively, you can call HMRC on 0300 200 3300 (have your National Insurance number ready).

Check your full take-home pay

Make sure your monthly budget adds up. Use our comprehensive payslip calculator to see exactly how much you will take home after tax, pension, and student loan deductions.

Take Home Pay Calculator โ†’

Frequently Asked Questions

What does the letter in my tax code mean?โ†“
The letter in your tax code tells HMRC about your situation. 'L' is the most common and means you get the standard tax-free personal allowance. 'BR' means you pay basic rate (20%) tax on all income, usually because you have a second job. '0T' means you have no tax-free allowance. Letters like 'M' or 'N' relate to the Marriage Allowance.
What does a 'K' tax code mean?โ†“
A tax code starting with 'K' means you have income that isn't being taxed another way, and it's more than your tax-free allowance. HMRC essentially 'adds' this to your taxable income to ensure you pay the right amount. It often applies if you receive a company car, taxable state benefits, or owe tax from a previous year.
How do I check if my tax code is correct?โ†“
You should first find your tax code on your latest payslip or P60. Use a tax code checker tool to understand what it means. If the explanation doesn't match your personal situation (e.g., you're on a BR code but only have one job), it is likely incorrect and you need to contact HMRC.
How do I change a wrong tax code?โ†“
You must contact HMRC directly to change your tax code; your employer cannot do it for you. The fastest way is via your online Personal Tax Account on the GOV.UK website, or by calling HMRC on 0300 200 3300. HMRC will then send an updated coding notice to your employer.

Related guides & tools

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Wrong Tax Code Fix
Step-by-step guide to fixing your code
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