A 15-year mortgage gives you a much lower interest rate and saves a fortune in total interest, but the monthly payment is roughly 40–50% higher. A 30-year mortgage keeps payments low and flexible, but you'll pay far more over the life of the loan. The right choice is almost entirely about cash flow versus total cost.
The core trade-off
Same loan, two terms — here's a realistic comparison on a $300,000 loan:
- 30-year at 6.5%: about $1,896/month, roughly $382,600 total interest.
- 15-year at 5.75% (15-year rates are usually lower): about $2,491/month, roughly $148,400 total interest.
The 15-year costs about $595 more per month but saves you well over $230,000 in interest and gets you debt-free in half the time. Plug your own numbers into the Mortgage Calculator — change only the term and watch both figures move.
Choose a 15-year if…
- The higher payment still leaves comfortable room in your budget.
- You want to be mortgage-free faster — before retirement or tuition years.
- You value paying the least total interest possible and have a stable income.
Choose a 30-year if…
- You want lower required payments and more monthly breathing room.
- You'd rather invest or keep the difference liquid for emergencies.
- Your income varies and payment flexibility matters more than total cost.
The middle path most people miss
You can take a 30-year loan for the safety of a low required payment, then voluntarily pay extra toward principal whenever you can. You keep flexibility but still kill interest and shorten the loan. See how powerful that is with the Extra Payment Mortgage Calculator or the Biweekly Mortgage Calculator.
New to how the payment itself is built? Start with how to calculate a mortgage payment, then come back and compare terms.
Try it yourself
Run your own numbers in the free Mortgage Calculator — instant, private, no sign-up.
Open the Mortgage Calculator →Frequently asked questions
- Is a 15-year mortgage really worth it?
- If the higher monthly payment fits your budget comfortably, yes — you typically get a lower rate and can save well over $200,000 in interest on a mid-size loan, while owning your home outright in half the time.
- Why is the interest rate lower on a 15-year mortgage?
- Shorter loans are less risky for lenders and tie up their money for less time, so they price 15-year mortgages with a lower rate than 30-year ones — often around 0.5%–0.75% lower.
- Can I get a 30-year mortgage and pay it off in 15 years?
- Yes. Take the 30-year loan for the lower required payment, then add extra to principal each month. You keep flexibility if money gets tight, but can match a 15-year payoff when you can afford to.
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