50-Year Mortgage on $300,000 Home
Last updated June 2026
On a $300,000 home with 20% down ($60,000), a 50-year mortgage at 6.875% gives you a monthly payment of $1,421 compared to $1,577 on a 30-year term — saving $156/month but costing $285,094 more in total interest.
Property Details
Term Comparison
| Term | Monthly Payment | Total Interest | Total Cost | vs 30yr |
|---|---|---|---|---|
| 15 yr | $2,140 | $145,281 | $385,281 | $-182K interest |
| 20 yr | $1,843 | $202,261 | $442,261 | $-125K interest |
| 25 yr | $1,677 | $263,154 | $503,154 | $-64K interest |
| 30 yr (baseline) | $1,577 | $327,586 | $567,586 | baseline |
| 40 yr | $1,470 | $465,453 | $705,453 | +$138K interest |
| 50 yr | $1,421 | $612,680 | $852,680 | +$285K interest |
50-Year Monthly Payment
$1,421
vs 30yr: saves $155/month
The Cost of Time
Interest Share of Total Cost
What This Means
For a $300,000 home with 20% down, you borrow $240,000. At 6.875%, a 50-year mortgage drops your monthly principal and interest payment to $1,421, compared to $1,577 on a 30-year and $2,140 on a 15-year. The monthly savings of $156 versus a 30-year term may sound appealing, but the true cost is significant: you pay $612,680 in total interest over 50 years versus $327,586 over 30 years — an extra $285,094. 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.