A $350,000 fixed-rate mortgage at 4% APR paid over 20 years costs $2,120.93 per month. Over the life of the loan you would pay $159,023 in interest — 45% of the amount borrowed.
The 4% rate on this page is 2.43 points below this week's national average of 6.43% for a 30-year fixed mortgage (Freddie Mac PMMS, July 2, 2026).
| Period | Principal paid | Interest paid | Balance |
|---|
| Scenario | Monthly | Total interest |
|---|---|---|
| $350,000 at 4% (20yr) ← this page | $2,120.93 | $159,023 |
| $350,000 at 4.25% (20yr) | $2,167.32 | $170,157 |
| $350,000 at 4.5% (20yr) | $2,214.27 | $181,425 |
| $350,000 at 4.75% (20yr) | $2,261.78 | $192,828 |
| $350,000 at 5% (20yr) | $2,309.85 | $204,363 |
| $350,000 at 5.25% (20yr) | $2,358.45 | $216,029 |
| $350,000 at 5.5% (20yr) | $2,407.61 | $227,825 |
| $350,000 at 5.75% (20yr) | $2,457.29 | $239,750 |
| $350,000 at 6% (20yr) | $2,507.51 | $251,802 |
| $350,000 at 6.25% (20yr) | $2,558.25 | $263,980 |
| $350,000 at 6.5% (20yr) | $2,609.51 | $276,281 |
| $350,000 at 6.75% (20yr) | $2,661.27 | $288,706 |
| $350,000 at 7% (20yr) | $2,713.55 | $301,251 |
| $350,000 at 7.25% (20yr) | $2,766.32 | $313,916 |
| $350,000 at 7.5% (20yr) | $2,819.58 | $326,698 |
| $350,000 at 7.75% (20yr) | $2,873.32 | $339,597 |
| $350,000 at 8% (20yr) | $2,927.54 | $352,610 |
| $350,000 at 8.5% (20yr) | $3,037.38 | $378,972 |
| $350,000 at 9% (20yr) | $3,149.04 | $405,770 |