A $350,000 fixed-rate mortgage at 8.5% APR paid over 10 years costs $4,339.50 per month. Over the life of the loan you would pay $170,740 in interest — 49% of the amount borrowed.
The 8.5% rate on this page is 2.71 points above this week's national average of 5.79% for a 15-year fixed mortgage (Freddie Mac PMMS, July 2, 2026).
| Period | Principal paid | Interest paid | Balance |
|---|
| Scenario | Monthly | Total interest |
|---|---|---|
| $350,000 at 4% (10yr) | $3,543.58 | $75,230 |
| $350,000 at 4.25% (10yr) | $3,585.31 | $80,238 |
| $350,000 at 4.5% (10yr) | $3,627.34 | $85,281 |
| $350,000 at 4.75% (10yr) | $3,669.67 | $90,361 |
| $350,000 at 5% (10yr) | $3,712.29 | $95,475 |
| $350,000 at 5.25% (10yr) | $3,755.21 | $100,625 |
| $350,000 at 5.5% (10yr) | $3,798.42 | $105,810 |
| $350,000 at 5.75% (10yr) | $3,841.92 | $111,031 |
| $350,000 at 6% (10yr) | $3,885.72 | $116,286 |
| $350,000 at 6.25% (10yr) | $3,929.80 | $121,576 |
| $350,000 at 6.5% (10yr) | $3,974.18 | $126,902 |
| $350,000 at 6.75% (10yr) | $4,018.84 | $132,261 |
| $350,000 at 7% (10yr) | $4,063.80 | $137,656 |
| $350,000 at 7.25% (10yr) | $4,109.04 | $143,084 |
| $350,000 at 7.5% (10yr) | $4,154.56 | $148,547 |
| $350,000 at 7.75% (10yr) | $4,200.37 | $154,045 |
| $350,000 at 8% (10yr) | $4,246.47 | $159,576 |
| $350,000 at 8.5% (10yr) ← this page | $4,339.50 | $170,740 |
| $350,000 at 9% (10yr) | $4,433.65 | $182,038 |