$300,000 Mortgage at 3% for 20 Years
A $300,000 mortgage at 3% over 20 years has a monthly principal + interest payment of $1,664. You'll pay $99,310 in total interest, bringing total loan cost to $399,310.
Estimated monthly payment
$2,164
Principal + interest
$1,664
Property tax
$375
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$2,164
1st month interest
$750
1st month principal
$914
Total interest
$99,310
Balance after 1 year
$288,882
Balance after 5 years
$240,926
Total cost (P+I)
$399,310
Amortization (first 10 years)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $11,118 | $8,848 | $288,882 |
| 2 | $11,456 | $8,510 | $277,427 |
| 3 | $11,804 | $8,161 | $265,623 |
| 4 | $12,163 | $7,802 | $253,459 |
| 5 | $12,533 | $7,432 | $240,926 |
| 6 | $12,914 | $7,051 | $228,012 |
| 7 | $13,307 | $6,658 | $214,705 |
| 8 | $13,712 | $6,254 | $200,993 |
| 9 | $14,129 | $5,837 | $186,864 |
| 10 | $14,559 | $5,407 | $172,305 |
15-year vs 30-year
| Term | Monthly P+I | Total interest | Total cost |
|---|---|---|---|
| 15 years | $2,072 | $72,914 | $372,914 |
| 30 years | $1,265 | $155,332 | $455,332 |
Choosing 15 years over 30 saves about $82,418 in interest at this rate and loan amount.
Extra payments
Payment breakdown
Monthly P+I
$1,664
Total payments
240
Total interest
$99,310
Total cost (P+I only)
$399,310
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Last updated: 2026