There are quite a few people that overpay on their tax. This is for a variety of reasons, but it is therefore always wise to check that you are on the right tax code and that you are not owed any money.
If you have never checked, then it could be good to check. You will have to complete a form to say where you want the refund to go and disclose income details so that the amount of the refund can be calculated. It is fairly simple and well worth it when you get the money that you are entitled to .
You will need to talk to HMRC and explain why you think you are due a refund. If it goes back over previous tax years, then they can send the payment straight to your bank account. If it is for the current tax year, they will pay you back in your wages, if you are employed.
There are some calculators where you can work out how much tax you should be paying. By using one of these you can see whether you have been paying too much and this will help you to know if you are due a refund of some sort. You can only claim back six years, so unfortunately overpayments made before this date are lost.
You may wonder where to start with all this. You need to find a pay slip and this will have your tax code on it. Then you can go to the HMRC website and find out what this tax code means. It is actually how much you can earn before you pay tax and what tax band you are in. If you feel that this is wrong, once you have looked up what it means, then you can go to the HMRC, by telephoning them using the number on their website and request a refund and they will send you the relevant form. If this still sounds complicated, then go to the Citizens advice bureau and they will talk you through it all. You could also use a tax advisor if you income is complicated for any reason.