Your tax code is based on the information HMRC holds for you. If anything changes for you financially – new job, second job or a bonus – then be sure HMRC know by updating them through your online Personal Tax Account or giving them a call. If HMRC don’t know something has changed they may end up taking too much or too little tax from you. This could leave you will not enough money now, or a large tax bill at the end of the year. It is always best to just keep your information up to date and keep HMRC informed.
If you haven’t set up your Personal Tax Account online yet visit .gov.uk find out more.