DayCents

Fixed-Rate Mortgage

A fixed-rate mortgage keeps the same interest rate — and the same principal-and-interest payment — for the entire loan, typically 15 or 30 years. It trades a slightly higher starting rate than an ARM for total predictability, the reason it's the most popular U.S. home loan.

The rate is locked, but the payment is not entirely: only principal and interest are fixed, while property taxes and insurance sit in escrow and rise over time, so a “fixed” payment does drift upward. On a $320,000 loan, 30 years at 6.5% costs $2,023 a month and about $408,100 of interest, while 15 years at 5.9% costs $2,683 and about $163,000 — a $660 difference in payment for $245,200 in interest. The overlooked third option is a 30-year paid at the 15-year amount, which clears in 16.1 years for about $195,800, so roughly $32,900 buys the right to drop back to the lower payment whenever you need to.