Overpaying your mortgage can save years and tens of thousands in interest. Model extra monthly payments or a lump sum — then check whether your country's early-repayment penalty makes it worthwhile.
Mortgage interest is charged on your outstanding balance. Every extra dollar you pay reduces that balance immediately, so less interest accrues for the rest of the loan. The effect compounds: a modest $200/month overpayment on a typical 25-year loan can cut several years off the term and save five figures in interest.
Some countries charge an Early Repayment Charge (ERC) during a fixed period. The penalty checker above applies your country's real rules and automatically drops the penalty to zero once you pass the penalty-free threshold (for example, Romania after year 1, the UK after the 5-year fixed period, the USA after year 3).