Is a 15-year mortgage always better financially?

In pure interest cost terms, yes — a 15-year mortgage almost always saves significantly more in total interest. But 'better financially' depends on your full picture. If the higher payment strains your budget, creates financial stress, or prevents you from investing, the 30-year may be the wiser choice overall.

What is the typical rate difference between 15 and 30 year mortgages?

Historically, 15-year mortgage rates have been 0.5-0.75% lower than 30-year rates. This spread can narrow or widen depending on market conditions. The lower rate on the 15-year amplifies the interest savings beyond just the shorter term — you are paying less interest on each dollar borrowed.

Can I get the benefits of a 15-year by making extra payments on a 30-year?

Yes — this is a popular strategy that gives you the interest savings of the 15-year with the payment flexibility of the 30-year. If you pay enough extra each month to match the 15-year payoff timeline, you achieve essentially the same outcome. The risk: discipline. Most people do not consistently make extra payments for 15 years.

How much more per month is a 15-year mortgage?

The monthly payment on a 15-year mortgage is typically 30-40% higher than a 30-year mortgage for the same loan amount. The exact difference depends on loan size and rate difference. On a $300,000 loan at current rates, the difference is typically $500-$700 per month.

Does a 15-year mortgage affect how much house I can buy?

Yes — because lenders qualify you based on your monthly payment relative to income, the higher 15-year payment reduces how much you can borrow. If your maximum monthly payment is $2,000 at 7%, you qualify for a $300,000 30-year loan but only a ~$230,000 15-year loan at 6.5%. Many buyers choose 30-year for this reason.

15 vs 30 Year Mortgage Calculator

The choice between a 15-year and 30-year mortgage is one of the most consequential financial decisions a homeowner makes — and the numbers are often shocking when laid out side by side. On a $300,000 loan, a 30-year mortgage at 7% costs $418,527 in interest over its lifetime. The same loan as a 15-y...

15 VS 30 YEAR

Loan Amount

15-Year Rate (%)

30-Year Rate (%)

LIVE DIAGRAM

Enter a loan amount to compare

Created with❤️byeaglecalculator.com

HOW TO USE

1
Enter your Loan Amount — the amount you plan to borrow.
2
Enter the 15-Year Rate and 30-Year Rate from your lender. 15-year rates are typically 0.5-0.75% lower.
3
The comparison table appears instantly showing monthly payment, total interest, and total cost for both options.
4
Check the Live Diagram for payment bars and the balance curve showing how equity builds differently over time.
5
The key question: can you afford the higher 15-year payment comfortably? If yes, the lifetime savings are substantial.

WORKED EXAMPLE

$300,000 loan. 15-Year at 6.5%: Monthly = $2,613.32. Total interest = $170,398. Total cost = $470,398. 30-Year at 7%: Monthly = $1,995.91. Total interest = $418,527. Total cost = $718,527. Extra monthly cost of 15-year: $617.41. Interest saved with 15-year: $248,129. The 15-year borrower pays $617 more per month for 15 years ($111,060 extra) but saves $248,129 in interest — a net gain of $137,069 just from the rate and term difference.

REFERENCE FORMULAS

FORMULA REFERENCE TABLE

NAME	FORMULA	DESCRIPTION
Monthly Payment	M = P × r(1+r)ⁿ / ((1+r)ⁿ - 1)	P = loan, r = monthly rate (annual/1200), n = total months
Total Cost	Total = M × n	Total amount paid over entire loan term
Total Interest	Interest = Total - Principal	Total interest paid above original loan amount
Interest Saved	Saved = 30yr Interest - 15yr Interest	Lifetime interest savings by choosing 15-year

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Last updated: April 25, 2026 · Formula verified by EagleCalculator team · Eagle-eyed accuracy for every calculation.