The Cost of a $250,000 Mortgage Across Different Rates

For a $250,000 mortgage, the choice between a 30-year and 15-year loan dramatically affects both monthly payments and total interest paid over time—especially when interest rates vary. Today’s lending environment makes this trade-off more critical than ever, as even small differences in rates can reshape long-term affordability. The table below shows how monthly payments and lifetime interest differ across a range of APRs for both loan terms, offering a clear, data-driven comparison.

$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

A 15-year mortgage typically offers a lower interest rate than a 30-year loan, not because of policy, but because of reduced risk to lenders—shorter terms mean faster repayment and less exposure to rate increases. However, the higher monthly payments can strain budgets, especially for those with limited savings or irregular income. In contrast, a 30-year loan spreads payments over decades, reducing each month’s burden but at the cost of significantly more total interest paid over time. For example, at a 5.0% APR, a 30-year loan results in a monthly payment of $1,390, while a 15-year loan requires $1,890—more than $500 per month. Over 30 years, the 30-year loan accumulates nearly $110,000 in interest, compared to just $74,000 for the 15-year loan. That’s a difference of over $36,000 in interest alone—more than a year’s worth of rent for a typical home. This disparity grows with higher APRs. At 6.0%, the lifetime interest gap widens to over $48,000, illustrating how rising rates amplify the cost of long-term borrowing. The decision isn’t just about affordability—it’s about financial strategy. A 15-year loan is best for borrowers with stable incomes, strong credit, and a clear plan to pay off the mortgage early. It’s ideal for those who can manage higher monthly payments and may benefit from building equity faster. A 30-year loan, meanwhile, suits buyers who prioritize lower monthly obligations, such as those on fixed incomes or with irregular cash flow. It provides flexibility and peace of mind, even if it means paying nearly double the interest over time. It’s also important to note that interest rate volatility has a disproportionate effect on these loans. A 30-year loan locks in a rate for 30 years, making it vulnerable to future rate hikes. In contrast, a 15-year loan locks in a rate for just 15 years—offering more protection against rising rates in the long term. This makes the 15-year option more resilient in a high-inflation, rising-rate environment. How we calculated this: We used a standard amortization formula to compute monthly payments and total interest paid over the life of each loan. The inputs were a fixed loan amount of $250,000, APRs ranging from 3.5% to 7.0%, and two term lengths: 15 and 30 years. The monthly payment was calculated as: P = [r × PV] / [1 – (1 + r)^(-n)] where P is the monthly payment, r is the monthly interest rate (APR ÷ 12), PV is the loan amount, and n is the number of months. Total interest was then derived by subtracting the principal from the sum of all monthly payments. All figures are based on level-payment, fully amortizing loans with no prepayment penalties or balloon payments.