You pay almost all interest in the first few years otherwise. It's the same as minimum payments on credit cards.Making mortgage overpayments can help you save money in interest and clear your mortgage sooner. But first you should check if there are limits and charges. Many mortgage providers don't accept mortgage payments made with a credit card. You may be able to make mortgage overpayments up to a certain amount each year, without having to pay a fee. This will depend on the type of product you have. A great way to work out how much to overpay on your mortgage is to use our mortgage overpayment calculator. Is it better to save or invest my money? This MoneySavingExpert guide weighs up the pros and cons to help you make the right decision.