$300,000 Mortgage at 4.5% for 30 Years
A $300,000 mortgage at 4.5% over 30 years has a monthly principal + interest payment of $1,520. You'll pay $247,220 in total interest, bringing total loan cost to $547,220.
Estimated monthly payment
$2,020
Principal + interest
$1,520
Property tax
$375
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$2,020
1st month interest
$1,125
1st month principal
$395
Total interest
$247,220
Balance after 1 year
$295,160
Balance after 5 years
$273,474
Total cost (P+I)
$547,220
Amortization (first 10 years)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $4,840 | $13,401 | $295,160 |
| 2 | $5,062 | $13,179 | $290,098 |
| 3 | $5,295 | $12,946 | $284,804 |
| 4 | $5,538 | $12,703 | $279,266 |
| 5 | $5,792 | $12,448 | $273,474 |
| 6 | $6,058 | $12,182 | $267,415 |
| 7 | $6,337 | $11,904 | $261,079 |
| 8 | $6,628 | $11,613 | $254,451 |
| 9 | $6,932 | $11,308 | $247,519 |
| 10 | $7,251 | $10,990 | $240,268 |
15-year vs 30-year
| Term | Monthly P+I | Total interest | Total cost |
|---|---|---|---|
| 15 years | $2,295 | $113,096 | $413,096 |
| 30 years | $1,520 | $247,220 | $547,220 |
Choosing 15 years over 30 saves about $134,124 in interest at this rate and loan amount.
Extra payments
Payment breakdown
Monthly P+I
$1,520
Total payments
360
Total interest
$247,220
Total cost (P+I only)
$547,220
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Last updated: 2026