15-Year vs. 30-Year Mortgage: Which Should You Choose?
The trade is simple to state: a 15-year mortgage costs much more per month and far less in total; a 30-year costs less per month and much more in total. What makes the decision interesting is flexibility — and a middle path many buyers overlook.
The numbers
Illustration: $300,000 loan. 15-year loans typically price about 0.5–0.75% lower than 30-year loans; exact rates vary with the market.
| 30-year @ 6.75% | 15-year @ 6.10% | |
|---|---|---|
| Monthly P&I | ~$1,946 | ~$2,546 |
| Total interest | ~$400,500 | ~$158,300 |
Roughly $600 more per month buys about $240,000 less interest in this example. Run your own numbers with the mortgage calculator.
The case for 15 years
- Dramatically less interest, plus a lower rate.
- You own the home outright in half the time — powerful if you want a paid-off house before retirement.
- Forced discipline: the savings happen automatically.
The case for 30 years
- Flexibility is insurance. The lower required payment protects you in a job loss or emergency; you can always pay extra, but you can’t pay less on a 15.
- The monthly difference can fund things with high returns or high importance: a 401(k) match (an immediate ~50–100% return where offered), an emergency fund, or paying off higher-rate debt — all of which usually beat prepaying a mortgage.
- Qualifying is easier: the lower payment keeps your debt-to-income ratio down.
The middle path: 30-year loan, 15-year habit
Take the 30-year, then voluntarily pay the 15-year amount whenever you can. Extra principal shortens the loan dramatically, and if life gets hard you drop back to the required payment with no penalty (prepayment penalties are rare on conventional loans, but confirm yours).
The honest catch: you pay slightly more for this flexibility (the 30-year’s higher rate), and most people don’t stick to voluntary extra payments. If you know yourself to be undisciplined, the 15-year’s rigidity is a feature.
A reasonable default
Many financial educators suggest: take the 15-year only if you can do it while still maxing your employer match, holding an emergency fund, and carrying no high-interest debt. Otherwise take the 30-year and put the difference to work — deliberately, not by accident.