50-Year Mortgage on $1,000,000 Home
Last updated June 2026
On a $1,000,000 home with 20% down ($200,000), a 50-year mortgage at 6.875% gives you a monthly payment of $4,737 compared to $5,255 on a 30-year term — saving $518/month but costing $950,310 more in total interest.
Property Details
Term Comparison
| Term | Monthly Payment | Total Interest | Total Cost | vs 30yr |
|---|---|---|---|---|
| 15 yr | $7,135 | $484,270 | $1,284,270 | $-608K interest |
| 20 yr | $6,143 | $674,202 | $1,474,202 | $-418K interest |
| 25 yr | $5,591 | $877,180 | $1,677,180 | $-215K interest |
| 30 yr (baseline) | $5,255 | $1,091,955 | $1,891,955 | baseline |
| 40 yr | $4,899 | $1,551,511 | $2,351,511 | +$460K interest |
| 50 yr | $4,737 | $2,042,265 | $2,842,265 | +$950K interest |
50-Year Monthly Payment
$4,737
vs 30yr: saves $518/month
The Cost of Time
Interest Share of Total Cost
What This Means
For a $1,000,000 home with 20% down, you borrow $800,000. At 6.875%, a 50-year mortgage drops your monthly principal and interest payment to $4,737, compared to $5,255 on a 30-year and $7,135 on a 15-year. The monthly savings of $518 versus a 30-year term may sound appealing, but the true cost is significant: you pay $2,042,265 in total interest over 50 years versus $1,091,955 over 30 years — an extra $950,310. 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.