$300,000 Mortgage at 4% for 20 Years
A $300,000 mortgage at 4% over 20 years has a monthly principal + interest payment of $1,818. You'll pay $136,306 in total interest, bringing total loan cost to $436,306.
Estimated monthly payment
$2,318
Principal + interest
$1,818
Property tax
$375
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$2,318
1st month interest
$1,000
1st month principal
$818
Total interest
$136,306
Balance after 1 year
$290,003
Balance after 5 years
$245,771
Total cost (P+I)
$436,306
Amortization (first 10 years)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $9,997 | $11,818 | $290,003 |
| 2 | $10,405 | $11,411 | $279,598 |
| 3 | $10,828 | $10,987 | $268,770 |
| 4 | $11,270 | $10,546 | $257,500 |
| 5 | $11,729 | $10,087 | $245,771 |
| 6 | $12,207 | $9,609 | $233,565 |
| 7 | $12,704 | $9,111 | $220,861 |
| 8 | $13,222 | $8,594 | $207,639 |
| 9 | $13,760 | $8,055 | $193,879 |
| 10 | $14,321 | $7,495 | $179,558 |
15-year vs 30-year
| Term | Monthly P+I | Total interest | Total cost |
|---|---|---|---|
| 15 years | $2,219 | $99,431 | $399,431 |
| 30 years | $1,432 | $215,609 | $515,609 |
Choosing 15 years over 30 saves about $116,177 in interest at this rate and loan amount.
Extra payments
Payment breakdown
Monthly P+I
$1,818
Total payments
240
Total interest
$136,306
Total cost (P+I only)
$436,306
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Nearby scenarios
$275,000 · 4% · 20 yr
$1,666/mo
$325,000 · 4% · 20 yr
$1,969/mo
$250,000 · 4% · 20 yr
$1,515/mo
$350,000 · 4% · 20 yr
$2,121/mo
$300,000 · 3.5% · 20 yr
$1,740/mo
$300,000 · 4.5% · 20 yr
$1,898/mo
$300,000 · 3% · 20 yr
$1,664/mo
$300,000 · 5% · 20 yr
$1,980/mo
$300,000 · 4% · 15 yr
$2,219/mo
$300,000 · 4% · 30 yr
$1,432/mo
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Last updated: 2026