15-Year vs 30-Year Mortgage: Which One Actually Saves You More?
A side-by-side comparison of 15-year and 30-year mortgages, the monthly payment, total interest, and who each option really suits, with real numbers.
Choosing a mortgage term is one of the biggest financial decisions most people ever make, and the difference between 15 and 30 years is measured in hundreds of thousands of dollars. Neither is automatically "better." The right answer depends on your budget, your discipline, and what else you would do with the money.
The headline trade-off
Let's compare a $300,000 loan at 6.5% over both terms:
The 15-year costs about $718 more a month, but look at what that buys you over the life of the loan:
The full picture
| 15-year | 30-year | |
|---|---|---|
| Monthly payment | $2,614 | $1,896 |
| Total interest | $170,430 | $382,740 |
| Total repaid | $470,430 | $682,740 |
| Equity built | Faster | Slower |
| Monthly flexibility | Lower | Higher |
When the 15-year wins
- You can comfortably afford the higher payment without sacrificing emergency savings or retirement contributions.
- You want to be debt-free sooner, perhaps before retirement or a child's college years.
- You value guaranteed interest savings over the flexibility of a lower payment.
When the 30-year wins
- You want a lower, more flexible payment that leaves room in the budget.
- You would invest the monthly difference, where it might earn more than the mortgage rate.
- Your income is variable and you value breathing room over a fixed high commitment.
Take the 30-year for its lower required payment, then voluntarily pay extra toward principal. You keep flexibility in tight months but still knock years off the loan when cash allows. Just confirm there is no prepayment penalty.
Don't forget opportunity cost
The 15-year's savings are guaranteed. But if you would reliably invest the $718 monthly difference at a higher long-term return, the 30-year could leave you wealthier overall, in theory. The catch is discipline: the guaranteed saving only loses if you actually invest the difference every month, which many people do not.
Compare your own loan. Enter your home price, down payment and rate, then switch the term to see the payment and total interest for each.
Open the Mortgage Calculator →The bottom line
A 15-year mortgage is the cheaper path if you can afford it and value certainty. A 30-year offers flexibility and the option to invest the difference. Run both through a calculator with your real numbers, then choose the payment that fits your life as well as your spreadsheet.
Frequently asked questions
Is a 15-year mortgage worth it?
If you can comfortably afford the higher payment, a 15-year mortgage saves a large amount of interest and builds equity faster. If the higher payment would strain your budget or crowd out saving and investing, a 30-year with optional extra payments may suit you better.
Can I pay off a 30-year mortgage faster?
Yes. Making extra payments toward principal on a 30-year loan can shorten it significantly, giving you flexibility: you commit to the lower payment but pay more when you can.
Why is the interest so much higher on a 30-year loan?
You borrow the money for twice as long, so interest accrues over far more months, even though each monthly payment is smaller.