15-Year vs. 30-Year Mortgage: How to Choose
A 15-year mortgage costs far less interest and builds equity fast; a 30-year keeps the monthly payment low and flexible. Here's how to weigh the trade against your budget and goals — and why the middle path often wins.
Key takeaways
- 15-year: lower rate, half the term, dramatically less total interest, faster equity.
- 30-year: smaller payment, more flexibility, but far more interest over the loan.
- A popular middle path: take the 30-year and make extra principal payments when you can.
- Capturing your full 401(k) match usually beats paying the mortgage down faster.
The 15-year versus 30-year mortgage decision is a trade between a lower lifetime cost and a lower monthly payment. Neither is automatically 'smarter' — the right answer depends on your budget, your other goals, and how much certainty you want. Here's how to think it through.
The trade in one sentence
A 15-year loan carries a lower interest rate and pays off in half the time, so you pay dramatically less total interest — often less than half. A 30-year loan spreads the balance over twice as many payments, so each one is smaller and easier to carry, but you pay far more interest over the life of the loan.
Why the 15-year saves so much
Two forces stack up: lenders usually offer a lower rate on 15-year loans, and you're borrowing for half as long. On a $320,000 loan, moving from a 30-year to a 15-year can cut total interest by six figures — while building equity much faster because more of each payment goes to principal from day one.
Why the 30-year still wins for many buyers
The 15-year's higher monthly payment is the catch. That larger commitment can crowd out retirement contributions, an emergency fund, or simply breathing room. A popular middle path is to take the 30-year for its flexibility and make extra principal payments when you can — you capture much of the savings without being locked into the higher payment.
How to decide
- Choose the 15-year if the higher payment fits comfortably AND you've already secured your employer match and emergency fund.
- Choose the 30-year if you value flexibility, have higher-return uses for the cash, or the 15-year payment would stretch you.
- Either way, capturing your full 401(k) match usually beats paying the mortgage down faster.
Run both terms
Use the mortgage and amortization calculators below to compare the two side by side: enter your loan at a 30-year and a 15-year term to see the monthly payment, the total interest, and how fast equity builds. Seeing both numbers together makes the trade concrete for your budget.
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Frequently asked questions
Is a 15-year or 30-year mortgage better?
A 15-year costs much less interest and builds equity faster, but the monthly payment is significantly higher. A 30-year is more affordable month to month and more flexible. The 15-year is better if the payment fits comfortably after your emergency fund and retirement savings; otherwise the 30-year usually wins.
How much does a 15-year mortgage save versus a 30-year?
Often six figures in total interest, thanks to a lower rate and half the number of payments. On a $320,000 loan, the difference can exceed $150,000 over the life of the loan — but you pay for it with a monthly payment that's roughly 40–50% higher.
Can I get the savings without committing to a 15-year payment?
Yes — take the 30-year and pay extra toward principal whenever you can. You keep the lower required payment for tough months but shrink the interest and the timeline in good ones. It captures much of the 15-year benefit while preserving flexibility.
Sources
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Disclaimer: DayCents provides this calculator for educational purposes only. Results are estimates based on your inputs and the stated assumptions — they are not financial advice, a quote, or an offer of credit. Consult a qualified financial professional before making major money decisions.