Your tax code tells your employer how much tax-free income you are entitled to, but the letters and numbers can be baffling. Whether your payslip shows 1257L, BR, K, or something else entirely, this tool explains exactly what your code means in plain English, whether it looks correct for your situation, and what to do if you think HMRC has got it wrong.
Understanding your tax code is the first step to making sure you are not paying too much or too little tax. If you have any comments or would like additional tools, please leave a comment at the bottom of this page.
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