50-Year Mortgage on $450,000 Home
Last updated June 2026
On a $450,000 home with 20% down ($90,000), a 50-year mortgage at 6.875% gives you a monthly payment of $2,132 compared to $2,365 on a 30-year term — saving $233/month but costing $427,639 more in total interest.
Property Details
Term Comparison
| Term | Monthly Payment | Total Interest | Total Cost | vs 30yr |
|---|---|---|---|---|
| 15 yr | $3,211 | $217,922 | $577,922 | $-273K interest |
| 20 yr | $2,764 | $303,391 | $663,391 | $-188K interest |
| 25 yr | $2,516 | $394,731 | $754,731 | $-97K interest |
| 30 yr (baseline) | $2,365 | $491,380 | $851,380 | baseline |
| 40 yr | $2,205 | $698,180 | $1,058,180 | +$207K interest |
| 50 yr | $2,132 | $919,019 | $1,279,019 | +$428K interest |
50-Year Monthly Payment
$2,132
vs 30yr: saves $233/month
The Cost of Time
Interest Share of Total Cost
What This Means
For a $450,000 home with 20% down, you borrow $360,000. At 6.875%, a 50-year mortgage drops your monthly principal and interest payment to $2,132, compared to $2,365 on a 30-year and $3,211 on a 15-year. The monthly savings of $233 versus a 30-year term may sound appealing, but the true cost is significant: you pay $919,019 in total interest over 50 years versus $491,380 over 30 years — an extra $427,639. 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.