Our Tax Calculators are easy to use, completely free and give you a personalised estimate of how much your tax refund claim is worth. You don’t need to go through a registration process to use one and they can’t capture your details. You do need some of your own information. This differs according to which tax calculator you are using, but you are told what you need before you start. Then the tax calculator you’re using gives you an approximate tax refund figure, based on your own financial situation.