30-Year vs 15-Year Mortgage: Which Is Better?
The 30-year mortgage gives you a smaller monthly payment and more flexibility. The 15-year mortgage saves you tens of thousands in interest and gets you debt-free in half the time. Both are right answers — for different people. Here's how to choose the one that fits.
The short answer
- Choose a 30-year if you want lower monthly payments, more flexibility, or you'd rather invest the difference.
- Choose a 15-year if you can comfortably afford the higher payment and want to be debt-free fast and pay far less interest overall.
- Hybrid approach: take the 30-year and pay extra principal whenever you can. You get most of the savings without locking in the higher required payment.
How the two terms compare
On the same loan amount, switching from a 30-year to a 15-year does three things:
- Monthly payment goes up — typically 40–50% higher because you're paying off the loan in half the time.
- Interest rate usually drops — 15-year rates are typically 0.5–0.75% lower than 30-year rates.
- Total interest drops dramatically — often by more than half, because both the term and the rate are smaller.
Worked example: $300,000 loan
Let's compare the same $300,000 mortgage on both terms, using realistic 2026 rates (6.5% for 30-year, 5.85% for 15-year):
| Loan term | Rate | Monthly P&I | Total interest |
|---|---|---|---|
| 30 years | 6.50% | ~$1,896 | ~$382,000 |
| 15 years | 5.85% | ~$2,512 | ~$152,200 |
| Difference | −0.65% | +$616/mo | −$229,800 |
The 15-year costs about $616 more per month but saves nearly $230,000 in interest over the life of the loan. That's the trade-off in one table.
Want to see your own numbers? Plug them into our mortgage calculator — switch the term between 30 and 15 to see the difference live.
When the 30-year wins
- You want maximum flexibility. The lower required payment is a safety net during job loss, illness, or income changes.
- Your income is variable. Self-employed, commission-based, or seasonal work pairs poorly with a high required payment.
- You'll actually invest the difference. If you reliably put the $600+/month into a diversified portfolio, you may end up wealthier than with a 15-year.
- You're stretching to buy. A 30-year keeps you in a home a 15-year payment would price you out of.
- You expect to move soon. Most early payments on a 15-year go to interest anyway; the savings only compound if you stay long enough.
When the 15-year wins
- You can comfortably afford the higher payment. "Comfortably" means it doesn't crowd out retirement savings or an emergency fund.
- You're closer to retirement. Owning your home outright before you stop working is a powerful financial position.
- You won't actually invest the difference. Be honest. For most people, a 15-year is forced savings that beats good intentions.
- You hate debt. The psychological win of being mortgage-free in 15 years is real, even when the math is debatable.
- You're in your forever home. The longer you stay, the more the interest savings stack up.
The hybrid: 30-year with extra payments
For many buyers, the smartest move is a 30-year loan with optional extra principal payments. You get:
- The lower required payment as a safety net.
- The flexibility to pay extra when cash flow allows.
- Most of the interest savings a 15-year would give you.
On the same $300,000 / 30-year / 6.5% loan, paying just $200 extra per month shortens the loan by about 6 years and saves roughly $90,000 in interest. Paying $616 extra (matching the 15-year payment) gets you most of the way to the full 15-year savings — without ever being locked into the higher payment.
See our guide on how to pay off a loan faster for the math behind extra-payment strategies.
Run your own numbers
Plug your loan amount and rate into the mortgage calculator, switch between 30 and 15 years, and see the exact monthly payment and total interest for both.
Compare 30-year vs 15-year on your loan
Open the mortgage calculator, enter your loan amount and rate, then switch the term to see the monthly payment and total interest side by side.
Open Mortgage CalculatorFrequently Asked Questions
Is a 15-year mortgage better than a 30-year?
Better for total interest paid, worse for monthly cash flow. A 15-year loan typically saves $100,000+ in interest on a $300,000 mortgage but costs roughly 40–50% more per month. The right answer depends on your budget, job stability, and what else you'd do with the cash flow difference.
How much more is a 15-year mortgage per month?
On a $300,000 loan at 6.5%, a 30-year payment is around $1,896/month and a 15-year is around $2,613 — a difference of roughly $717/month, or about 38% more. The exact gap depends on the rate spread between the two terms.
Can I get a 15-year rate on a 30-year loan?
Not directly, but you can take a 30-year loan and pay extra principal each month to mimic a 15-year payoff. You'll keep the lower required payment as a safety net, but lose the slightly lower interest rate that 15-year loans usually offer (typically 0.5–0.75% lower).
Should I refinance from a 30-year to a 15-year?
Refinancing makes sense if rates have dropped enough to absorb closing costs and you can comfortably handle the higher payment. A common rule: refinance if the new rate is at least 0.75–1% lower and you'll stay in the home long enough to recoup the closing costs.
What if I can't afford the 15-year payment?
Take the 30-year and add extra principal whenever you can. Even one extra payment per year can shave 4–5 years off a 30-year mortgage. The flexibility of the lower required payment is valuable insurance against job loss or emergencies.
Do 15-year loans have lower interest rates?
Usually yes — typically 0.5–0.75% lower than 30-year rates because the lender's risk is shorter. That spread is part of why a 15-year saves so much total interest, beyond just the shorter term.
Is investing the difference better than a 15-year mortgage?
Mathematically, if you can earn more than your mortgage rate after tax in the market, investing wins. Practically, most people don't actually invest the difference — they spend it. A 15-year mortgage is forced savings, which is why it works so well for many households.