$300,000 Mortgage at 4.5% for 20 Years
A $300,000 mortgage at 4.5% over 20 years has a monthly principal + interest payment of $1,898. You'll pay $155,508 in total interest, bringing total loan cost to $455,508.
Estimated monthly payment
$2,398
Principal + interest
$1,898
Property tax
$375
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$2,398
1st month interest
$1,125
1st month principal
$773
Total interest
$155,508
Balance after 1 year
$290,531
Balance after 5 years
$248,100
Total cost (P+I)
$455,508
Amortization (first 10 years)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $9,469 | $13,306 | $290,531 |
| 2 | $9,904 | $12,871 | $280,627 |
| 3 | $10,359 | $12,416 | $270,268 |
| 4 | $10,835 | $11,940 | $259,433 |
| 5 | $11,333 | $11,443 | $248,100 |
| 6 | $11,853 | $10,922 | $236,247 |
| 7 | $12,398 | $10,377 | $223,849 |
| 8 | $12,967 | $9,808 | $210,881 |
| 9 | $13,563 | $9,212 | $197,318 |
| 10 | $14,186 | $8,589 | $183,132 |
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
$1,898
Total payments
240
Total interest
$155,508
Total cost (P+I only)
$455,508
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$1,740/mo
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$2,214/mo
$300,000 · 4% · 20 yr
$1,818/mo
$300,000 · 5% · 20 yr
$1,980/mo
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$300,000 · 5.5% · 20 yr
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$300,000 · 4.5% · 15 yr
$2,295/mo
$300,000 · 4.5% · 30 yr
$1,520/mo
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Last updated: 2026