50-Year Mortgage on $150,000 Home
Last updated June 2026
On a $150,000 home with 20% down ($30,000), a 50-year mortgage at 6.875% gives you a monthly payment of $711 compared to $788 on a 30-year term — saving $77/month but costing $142,547 more in total interest.
Property Details
Term Comparison
| Term | Monthly Payment | Total Interest | Total Cost | vs 30yr |
|---|---|---|---|---|
| 15 yr | $1,070 | $72,641 | $192,641 | $-91K interest |
| 20 yr | $921 | $101,130 | $221,130 | $-63K interest |
| 25 yr | $839 | $131,577 | $251,577 | $-32K interest |
| 30 yr (baseline) | $788 | $163,793 | $283,793 | baseline |
| 40 yr | $735 | $232,727 | $352,727 | +$69K interest |
| 50 yr | $711 | $306,340 | $426,340 | +$143K interest |
50-Year Monthly Payment
$711
vs 30yr: saves $78/month
The Cost of Time
Interest Share of Total Cost
What This Means
For a $150,000 home with 20% down, you borrow $120,000. At 6.875%, a 50-year mortgage drops your monthly principal and interest payment to $711, compared to $788 on a 30-year and $1,070 on a 15-year. The monthly savings of $77 versus a 30-year term may sound appealing, but the true cost is significant: you pay $306,340 in total interest over 50 years versus $163,793 over 30 years — an extra $142,547. 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.