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What's the catch with biweekly mortgage payments?
Another thing to consider is that paying extra principal (either via one of these services, or by including something extra with your normal mortgage payment and designating that it go to principal rather than be held to reduce next month's payment, or just sending an additional payment to the bank and designating it as reducing the principal) shortens the term of your loan. Is this good? Maybe. Consider that banks lend with a variety of terms. Usually the 15-year fixed rate mortgage has a lower interest rate than the 30-year fixed-rate mortgage, and the 5-year home-equity-loan has an even lower rate. When you prepay your loan, your interest rate stays the same, but the bank gets its money back sooner. This makes more profit for the bank as it can then invest the money in other things. That profit could have been yours if you had made that investment instead of prepaying your mortgage.