A $1,200,000 fixed-rate mortgage at 4.25% APR paid over 20 years costs $7,430.81 per month. Over the life of the loan you would pay $583,395 in interest — 49% of the amount borrowed.
The 4.25% rate on this page is 2.18 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 |
|---|---|---|
| $1,200,000 at 4% (20yr) | $7,271.76 | $545,223 |
| $1,200,000 at 4.25% (20yr) ← this page | $7,430.81 | $583,395 |
| $1,200,000 at 4.5% (20yr) | $7,591.79 | $622,030 |
| $1,200,000 at 4.75% (20yr) | $7,754.68 | $661,124 |
| $1,200,000 at 5% (20yr) | $7,919.47 | $700,673 |
| $1,200,000 at 5.25% (20yr) | $8,086.13 | $740,671 |
| $1,200,000 at 5.5% (20yr) | $8,254.65 | $781,115 |
| $1,200,000 at 5.75% (20yr) | $8,425.00 | $822,001 |
| $1,200,000 at 6% (20yr) | $8,597.17 | $863,321 |
| $1,200,000 at 6.25% (20yr) | $8,771.14 | $905,073 |
| $1,200,000 at 6.5% (20yr) | $8,946.88 | $947,251 |
| $1,200,000 at 6.75% (20yr) | $9,124.37 | $989,848 |
| $1,200,000 at 7% (20yr) | $9,303.59 | $1,032,861 |
| $1,200,000 at 7.25% (20yr) | $9,484.51 | $1,076,283 |
| $1,200,000 at 7.5% (20yr) | $9,667.12 | $1,120,108 |
| $1,200,000 at 7.75% (20yr) | $9,851.38 | $1,164,332 |
| $1,200,000 at 8% (20yr) | $10,037.28 | $1,208,947 |
| $1,200,000 at 8.5% (20yr) | $10,413.88 | $1,299,331 |
| $1,200,000 at 9% (20yr) | $10,796.71 | $1,391,211 |