15 vs 30 Year Mortgage: Which Saves More Money?
The shorter loan saves a fortune in interest — but the longer loan keeps your monthly budget flexible. Here's how to weigh the trade-off with real numbers.
Choosing your loan term is one of the biggest decisions in a mortgage. The two most common options — 15 years and 30 years — lead to very different outcomes. A 15-year loan builds equity fast and slashes interest, while a 30-year loan gives you breathing room each month. Neither is "better" universally; it depends on your goals and cash flow.
The core trade-off
A 30-year mortgage spreads your balance over 360 payments, so each one is smaller. A 15-year mortgage packs the same balance into 180 payments, so each one is larger — but you also typically get a lower interest rate, and you stop paying interest 15 years sooner. The result is dramatically less total interest.
Example: $300,000 loan
Here's an illustration using a $300,000 loan (rates vary, so treat these as examples — run your own in the calculator):
| 30-year @ 7.0% | 15-year @ 6.3% | |
|---|---|---|
| Monthly principal & interest | ~$1,996 | ~$2,588 |
| Total interest paid | ~$418,500 | ~$165,800 |
| Interest saved with 15-year | — | ~$252,700 |
The 15-year payment is about $592 higher per month, but it saves roughly a quarter of a million dollars in interest and you own the home outright in half the time.
Compare both terms on your own loan →Enter your price and rate, then tap the 15 yr and 30 yr buttons to watch the monthly payment and total interest change instantly.When a 30-year mortgage makes sense
- You want lower, more predictable monthly payments.
- You'd rather invest the monthly difference (potentially earning more than your mortgage rate).
- You value flexibility — you can always pay extra toward a 30-year loan to mimic a 15-year payoff, but you're never required to.
- You're buying more home than a 15-year payment would allow.
When a 15-year mortgage makes sense
- You can comfortably afford the higher payment without straining your budget.
- Your top priority is paying the least interest and being debt-free sooner.
- You're closer to retirement and want the home paid off before you stop working.
- You qualify for the lower 15-year rate and want to lock in that savings.
A middle path: the 30-year you pay like a 15
Many homeowners take a 30-year loan for the safety of a low required payment, then voluntarily pay extra each month. This gives you the best of both worlds: you can accelerate your payoff in good months and fall back to the lower payment if money gets tight. You won't get the 15-year's lower rate, but you keep total control.
The bottom line
If you can handle the higher payment and want maximum savings, the 15-year wins on pure math. If flexibility and lower monthly costs matter more, the 30-year is the safer choice — especially if you're disciplined about extra payments. The best way to decide is to see your actual numbers side by side.
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