15-Year vs. 30-Year Mortgage: Which Should You Choose?
The 30-year mortgage is the default in America — but it's not always the smartest choice. A 15-year mortgage can save you hundreds of thousands in interest, at the cost of a much higher monthly payment.
Here are the real numbers, side by side.
The Head-to-Head: $300,000 at 6.5%
| 30-Year | 15-Year | |
|---|---|---|
| Monthly payment (P&I) | $1,896 | $2,613 |
| Total interest paid | $382,633 | $170,398 |
| Total paid over life | $682,633 | $470,398 |
| Interest saved | — | $212,235 |
The 15-year loan costs $717 more per month — but saves you a staggering $212,000 in interest and 15 full years of payments. That's a new car. Or a kid's college fund. Or a big chunk of your retirement.
💡 Model both: The RateLedger mortgage calculator lets you compare 15- and 30-year terms instantly for your exact loan amount.
Why the Interest Difference Is So Huge
Two reasons, both working against the 30-year loan:
- You pay interest for twice as long. Fifteen extra years of accruing interest is expensive.
- Shorter loans get lower rates. Lenders usually price 15-year loans 0.5% to 1% lower, compounding the savings.
The Case for the 30-Year Mortgage
The 30-year isn't "bad" — it's flexible:
- Lower monthly payment — more room in your budget for emergencies, investing, and life.
- You can still pay it off early — most 30-year loans have no prepayment penalty. Make extra payments when you can, skip them when money's tight.
- You keep cash liquid — money not locked in home equity can be invested or saved.
In fact, many financial planners recommend the 30-year loan + extra payments strategy: you get the low required payment and the option to pay it down faster on your own schedule.
The Case for the 15-Year Mortgage
- Massive interest savings — six figures, as shown above.
- Forced discipline — the higher payment means you have to save.
- Debt-free faster — own your home outright 15 years sooner, freeing up that payment for retirement or other goals.
The catch: the higher payment is mandatory, not optional. If it leaves you with no emergency fund, it's a risk.
A Smart Middle Ground
Can't stomach a 15-year payment but want the savings? Take the 30-year and pay like a 15-year. Add enough extra each month to match what a 15-year payment would be — and you'll capture most of the interest savings while keeping the flexibility to pull back if you need to.
Frequently Asked Questions
How much do you save with a 15-year vs 30-year mortgage? It depends on the rate and amount, but on a $300,000 loan at 6.5%, a 15-year saves roughly $212,000 in interest compared to a 30-year.
Can I pay off a 30-year mortgage in 15 years? Yes — most 30-year loans have no prepayment penalty. Simply pay extra toward principal each month. The savings are nearly the same as a 15-year loan, minus the slightly higher 30-year rate.
Do 15-year mortgages have lower interest rates? Typically yes — usually 0.5% to 1% lower than comparable 30-year loans, because they're less risky for lenders.
Is a 30-year mortgage always the better choice for first-time buyers? Often, yes — the lower payment makes homeownership more affordable and keeps cash flexible. Just know you can always pay extra to shorten the term.
Decide with real numbers. Open the RateLedger mortgage calculator and compare both terms for your loan.