Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

What's the catch with biweekly mortgage payments?
Depending on who you have the loan through and how they figure the interest charges (whether daily, monthly, bi-monthly, etc. normally monthly I would assume), your interest is probably figured either daily or once a month.   Let's assume that it is figured daily, otherwise it wouldn't make sense to make bi-weekly payments.   At 4% Annual Interest on a $150,000 home loan the interested added each day is about $16.44, but it doesn't stop there because it is compounding interest daily so the next day it becomes 4% of 150,0016.44 (which is negligibly larger amount) and they will tack on another $16.44. So what will happen is that the amount of interest you owe grows rather quickly, especially if you miss a monthly payment.  Everyone knows that the faster you pay something off the less interest you pay, but not everyone knows the formula for compounding interest.  a quick Google search rendered this site with a simple explanation Compound Interest Formula  unfortunately this formula doesn't take into account the payments being made. The big thing with making your payments bi-weekly rather than a bigger payment once a month is that you pay off some of that principle right away and it won't collect interest for 14 more days. if the interest is only calculated once a month, make your full payment before the interest is calculated, the same goes for your credit cards.