Don't pay too much tax - check your tax code carefully

A computer glitch at HMRC means you could end up paying too much tax next year. To make sure you don't - check your tax code carefully.

The Chartered Institute of Taxation has warned that a computer blunder at HM Revenue & Customs (HMRC) means thousands of people could end up paying too much tax next year. To make sure you are not one of them, you need to check your tax code carefully.

HMRC will send out tax codes to about 25m taxpayers in the coming weeks. Many will simply be filed without being checked. But it is up to you to notify HMRC if there is a mistake, so make sure you double check your code to ensure that you pay the right amount of tax next year.

Here's what to look for:

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1. Check that all the basic information on your notice is correct. Is your name, National Insurance number and address right? And have they got your employer's name correct?

2. Is your personal allowance correct? If you only have one employer and are under 65 this should be £6,475.

3. Check your tax code. This is usually made up of several numbers and a letter. The number, if you multiply it by ten, should come to within £9 the amount of income your are entitled to before you have to pay tax. For a full breakdown of what the letters stand for, see the HMRC website.

Ruth Jackson-Kirby

Ruth Jackson-Kirby is a freelance personal finance journalist with 17 years’ experience, writing about everything from savings and credit cards to pensions, property and pet insurance. 

Ruth started her career at MoneyWeek after graduating with an MA from the University of St Andrews, and she continues to contribute regular articles to our personal finance section. After leaving MoneyWeek she went on to become deputy editor of Moneywise before becoming a freelance journalist.

Ruth writes regularly for national publications including The Sunday Times, The Times, The Mail on Sunday and Good Housekeeping among many other titles both online and offline.