From the developer: "ChargeChecker will calculate interest charges on your bank loan or overdraft and tell you exactly how much you should have paid in bank charges and if you were incorrectly charged. It produces reports which can be presented to banks in order to reclaim for overcharges. We have reclaimed amounts between ?300 and ?100,000 from banks that have overcharged accounts. Some estimates indicate that about 75% of businesses in the UK are incorrectly charged."