$300,000 Mortgage at 3% for 30 Years
A $300,000 mortgage at 3% over 30 years has a monthly principal + interest payment of $1,265. You'll pay $155,332 in total interest, bringing total loan cost to $455,332.
Estimated monthly payment
$1,765
Principal + interest
$1,265
Property tax
$375
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$1,765
1st month interest
$750
1st month principal
$515
Total interest
$155,332
Balance after 1 year
$293,737
Balance after 5 years
$266,719
Total cost (P+I)
$455,332
Amortization (first 10 years)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $6,263 | $8,914 | $293,737 |
| 2 | $6,454 | $8,724 | $287,283 |
| 3 | $6,650 | $8,528 | $280,632 |
| 4 | $6,852 | $8,325 | $273,780 |
| 5 | $7,061 | $8,117 | $266,719 |
| 6 | $7,276 | $7,902 | $259,443 |
| 7 | $7,497 | $7,681 | $251,946 |
| 8 | $7,725 | $7,453 | $244,221 |
| 9 | $7,960 | $7,218 | $236,261 |
| 10 | $8,202 | $6,976 | $228,059 |
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
$1,265
Total payments
360
Total interest
$155,332
Total cost (P+I only)
$455,332
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Last updated: 2026