The length of your mortgage shapes both your monthly budget and the total cost of your home. The two most common terms — 15 and 30 years — represent a classic trade-off between a low monthly payment and low lifetime interest.
The core trade-off
A 15-year loan has a higher monthly payment but a much lower interest rate and far less total interest. A 30-year loan spreads the balance over twice as long, so the monthly payment is lower and easier to manage, but you pay interest for an extra 15 years.
Consider a $300,000 loan. At a 30-year term around 6.5%, the payment is roughly $1,896 a month and you pay about $382,000 in interest over the life of the loan. At a 15-year term near 5.75%, the payment jumps to about $2,491 — but total interest falls to roughly $148,000. That is over $230,000 saved, in exchange for about $595 more each month.
When a 15-year makes sense
- You can comfortably afford the higher payment and still save for retirement and emergencies.
- You want to be debt-free sooner — for example, before kids start college or before you retire.
- You value the guaranteed return of avoiding interest over investing the difference.
When a 30-year makes sense
- You want lower, more flexible payments and a bigger cushion in your monthly budget.
- You would rather invest the difference, where long-term returns may exceed your mortgage rate.
- You are stretching to buy in an expensive market and need the lower payment to qualify.
A middle path: a 30-year you pay like a 15
Many buyers take the 30-year for its low required payment, then voluntarily pay extra to mimic a 15-year payoff. This keeps the flexibility to drop back to the lower payment in a tight month, while still cutting interest when times are good. See our guide on paying off your mortgage faster for how that works.
Run both side by side
The right answer depends on your rate, budget and goals. Plug both terms into the mortgage calculator — change the loan term from 30 to 15, compare the monthly payment and total interest, and use the amortization schedule to see how much faster the balance falls.