$300,000 Mortgage at 3.5% for 20 Years
A $300,000 mortgage at 3.5% over 20 years has a monthly principal + interest payment of $1,740. You'll pay $117,571 in total interest, bringing total loan cost to $417,571.
Estimated monthly payment
$2,240
Principal + interest
$1,740
Property tax
$375
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$2,240
1st month interest
$875
1st month principal
$865
Total interest
$117,571
Balance after 1 year
$289,453
Balance after 5 years
$243,380
Total cost (P+I)
$417,571
Amortization (first 10 years)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $10,547 | $10,332 | $289,453 |
| 2 | $10,922 | $9,957 | $278,532 |
| 3 | $11,310 | $9,568 | $267,221 |
| 4 | $11,713 | $9,166 | $255,509 |
| 5 | $12,129 | $8,749 | $243,380 |
| 6 | $12,560 | $8,318 | $230,819 |
| 7 | $13,007 | $7,871 | $217,812 |
| 8 | $13,470 | $7,409 | $204,342 |
| 9 | $13,949 | $6,930 | $190,393 |
| 10 | $14,445 | $6,434 | $175,948 |
15-year vs 30-year
| Term | Monthly P+I | Total interest | Total cost |
|---|---|---|---|
| 15 years | $2,145 | $86,037 | $386,037 |
| 30 years | $1,347 | $184,968 | $484,968 |
Choosing 15 years over 30 saves about $98,932 in interest at this rate and loan amount.
Extra payments
Payment breakdown
Monthly P+I
$1,740
Total payments
240
Total interest
$117,571
Total cost (P+I only)
$417,571
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Last updated: 2026