50-Year Mortgage on $500,000 Home
Last updated June 2026
On a $500,000 home with 20% down ($100,000), a 50-year mortgage at 6.875% gives you a monthly payment of $2,369 compared to $2,628 on a 30-year term — saving $259/month but costing $475,156 more in total interest.
Property Details
Term Comparison
| Term | Monthly Payment | Total Interest | Total Cost | vs 30yr |
|---|---|---|---|---|
| 15 yr | $3,567 | $242,135 | $642,135 | $-304K interest |
| 20 yr | $3,071 | $337,101 | $737,101 | $-209K interest |
| 25 yr | $2,795 | $438,590 | $838,590 | $-107K interest |
| 30 yr (baseline) | $2,628 | $545,977 | $945,977 | baseline |
| 40 yr | $2,449 | $775,756 | $1,175,756 | +$230K interest |
| 50 yr | $2,369 | $1,021,133 | $1,421,133 | +$475K interest |
50-Year Monthly Payment
$2,369
vs 30yr: saves $259/month
The Cost of Time
Interest Share of Total Cost
What This Means
For a $500,000 home with 20% down, you borrow $400,000. At 6.875%, a 50-year mortgage drops your monthly principal and interest payment to $2,369, compared to $2,628 on a 30-year and $3,567 on a 15-year. The monthly savings of $259 versus a 30-year term may sound appealing, but the true cost is significant: you pay $1,021,133 in total interest over 50 years versus $545,977 over 30 years — an extra $475,156. Your equity also builds far more slowly, with most of your early payments going toward interest. A 50-year mortgage can make sense as a temporary affordability tool if you plan to refinance or sell within a few years, but as a long-term strategy it costs substantially more than a conventional 30-year loan.