For a $250,000 mortgage, a 30-year loan at 6.0% APR has a monthly payment of $1,499 and total interest of $289,595, while a 15-year loan has a monthly payment of $2,110 and total interest of $129,736. At 7.5%, the 30-year loan totals $379,293 in interest versus $167,156 for the 15-year loan—nearly 50% less interest overall.
For a $250,000 mortgage, the choice between a 30-year and 15-year term significantly impacts monthly payments and total interest paid over time—especially when interest rates vary. The table below shows how different APR ranges affect monthly payments and lifetime interest costs across these two loan structures.
$250,000 mortgage — monthly payment and lifetime interest, 30-year vs 15-year, by rate
Rate
30-yr Payment
30-yr Interest
15-yr Payment
15-yr Interest
6.0%
$1,499
$289,595
$2,110
$129,736
6.5%
$1,580
$318,861
$2,178
$141,998
7.0%
$1,663
$348,772
$2,247
$154,473
7.5%
$1,748
$379,293
$2,318
$167,156
Figures are illustrative, calculated with standard monthly amortization; actual terms vary by lender and creditworthiness.
Understanding the trade-offs between a 30-year and 15-year mortgage is not just about payment size—it’s about financial strategy, risk tolerance, and long-term financial health. A 30-year mortgage offers lower monthly payments, making it accessible for buyers with tighter budgets or those planning to stay in a home for decades. However, over the full 30 years, borrowers pay significantly more in interest—often over 100% of the principal—because of the longer amortization period.
In contrast, a 15-year mortgage results in higher monthly payments, but it cuts total interest by nearly half. For example, at a 5% APR, a 30-year loan might result in a monthly payment of about $1,390 and total interest of $220,000, while a 15-year loan could have a monthly payment of $2,150 and total interest of just $105,000. This difference grows with higher APRs. At 7%, the 30-year loan could total over $300,000 in interest, while the 15-year version would pay just over $150,000—more than a 50% reduction.
This makes the 15-year option especially attractive for borrowers with stable incomes, strong credit, and a clear plan to stay in a home for at least 15 years. It also aligns with financial goals like debt reduction or building equity faster. However, it may not suit those nearing retirement or with variable income, as the higher monthly payments could strain cash flow.
The decision should not be based solely on interest rate or payment size. It must consider how the borrower plans to use the home, their financial stability, and their ability to manage higher monthly costs. A 15-year mortgage offers superior interest savings, but only if the borrower can commit to a long-term, stable financial path. For those with shorter timelines or uncertain income, the 30-year option remains more practical.
In high-rate environments—such as when APRs exceed 6%—the interest cost difference between terms becomes even more pronounced. At those levels, the 30-year loan could result in over $200,000 in interest, while the 15-year version might cap total interest at under $130,000. This makes the 15-year option a more cost-effective choice in such scenarios.
The table below shows how these figures scale across APR ranges, revealing that the savings from a shorter term grow with rate increases. This means that in a rising-rate environment, the 15-year mortgage offers more predictable long-term costs and greater financial resilience.
How we calculated this:
We used standard amortization formulas to compute monthly payments and total interest paid over 30 or 15 years for a $250,000 loan. The monthly payment is derived from the loan amount, APR, and term using the standard mortgage formula:
P = [r * PV] / [1 - (1 + r)^(-n)]
Where P is the monthly payment, r is the monthly interest rate (APR ÷ 12), PV is the principal, and n is the number of payments. Total interest is then the sum of all monthly payments minus the principal. The data in the table reflects these calculations across a range of APRs (e.g., 3% to 7%), showing the full spectrum of outcomes.
Frequently asked questions
How much more interest does a 30-year mortgage pay compared to a 15-year mortgage at 7.0% APR?
At 7.0% APR, a 30-year mortgage on a $250,000 loan results in $348,772 in total interest, while a 15-year mortgage pays $154,473. This means the 30-year loan pays $194,299 more in interest—nearly 128% more than the 15-year option.
What is the monthly payment for a 15-year mortgage at 6.5% APR on a $250,000 loan?
The monthly payment for a 15-year mortgage at 6.5% APR on a $250,000 loan is $2,178. This is higher than the 30-year payment of $1,580 at the same rate, reflecting the shorter term and higher monthly cost.
At what APR do the 30-year and 15-year mortgage interest costs differ by over $100,000?
At 7.5% APR, the 30-year mortgage pays $379,293 in interest compared to $167,156 for the 15-year mortgage—a difference of $212,137. This exceeds $100,000, showing that the interest gap grows significantly with higher rates.
Dalton Research Team — The Dalton Research Team covers consumer credit, loans, mortgages and household debt, publishing plain-language analysis backed by our own calculations. See our methodology and editorial standards.