A $400k home with a $80,000 down payment leaves a $320,000 loan. To keep the $2,755 total 30-year payment at or under 28% of gross income (the calculator's default housing ratio), household income would need to be roughly $118,069 a year, before other debts. Choosing the 15-year term instead cuts lifetime interest by about $288,552 ($477,622 vs $189,069), at the cost of a $613/month higher payment.
| Term | Rate | Principal & interest | Total monthly payment | Total interest |
|---|---|---|---|---|
| 30-year | 7.4% | $2,216 | $2,755 | $477,622 |
| 15-year | 6.73% | $2,828 | $3,367 | $189,069 |
Property taxes add $300/month and insurance adds $239/month in this example, on top of principal and interest, for either term.
Open the 30-year example Open the 15-year example
Source references: Tax Foundation: Property Taxes by State and County, 2026 Insurance.com: Average Homeowners Insurance Rates by State (2026)
Rate reference as of 10/8/2026. Educational software; no professional review claimed.