Free UK Tax Code Checker & Guide (Updated for 2026/27)

Answer 3 quick questions. We'll run your code through our logic engine and tell you exactly where you stand — Green, Amber or Red.

📝 Your Details

Monthly Gross Pay

Tax Code

Your Location

Reality Check — tick all that apply to you

This is my only current job or pension

No second employer, no side employment

I receive company benefits (car, medical, etc.)

Taxable benefits-in-kind reduce your allowance

I have been with this employer for more than 3 months

Emergency codes should be resolved after first payroll

✅

TAX HEALTH STATUS

Your Code Looks Correct

No obvious issues detected based on your answers.

💬 Your Personalised HMRC Contact Script

Copy and paste this into HMRC web chat or read it over the phone on 0300 200 3300:

HMRC lines open Mon–Fri 8am–6pm. Web chat is usually faster.

Frequently Asked Questions

What does the 'L' mean in my tax code?

The 'L' is the most common suffix and means you are entitled to the standard tax-free Personal Allowance. For 2026/27, the standard code is 1257L, giving you £12,570 tax-free.

Why is my code 'BR', 'D0' or '0T'?

These are typically used for a second job or pension. 'BR' taxes all income at the basic rate (20%), 'D0' at the higher rate (40%). '0T' means you have no Personal Allowance, possibly because your employer doesn't have the necessary details to give you a tax code.

What does 'W1' or 'M1' at the end of my code mean?

These are "emergency tax codes" (e.g., 1257L W1). They calculate tax only on what you earn in the current pay period, ignoring previous pay and tax. It often happens when you start a new job. Your employer should automatically fix this once they receive your P45 or HMRC details.

How do I update my tax code?

The easiest way is to use your personal tax account online or the HMRC app. Alternatively, use our generated script above and call HMRC directly on 0300 200 3300.