$100,000 Mortgage at 8% for 20 Years
A $100,000 mortgage at 8% over 20 years has a monthly principal + interest payment of $836. You'll pay $100,746 in total interest, bringing total loan cost to $200,746.
Estimated monthly payment
$1,086
Principal + interest
$836
Property tax
$125
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$1,086
1st month interest
$667
1st month principal
$170
Total interest
$100,746
Balance after 1 year
$97,886
Balance after 5 years
$87,526
Total cost (P+I)
$200,746
Amortization (first 10 years)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $2,114 | $7,924 | $97,886 |
| 2 | $2,289 | $7,748 | $95,597 |
| 3 | $2,479 | $7,558 | $93,118 |
| 4 | $2,685 | $7,352 | $90,433 |
| 5 | $2,908 | $7,130 | $87,526 |
| 6 | $3,149 | $6,888 | $84,377 |
| 7 | $3,410 | $6,627 | $80,966 |
| 8 | $3,693 | $6,344 | $77,273 |
| 9 | $4,000 | $6,037 | $73,273 |
| 10 | $4,332 | $5,705 | $68,941 |
15-year vs 30-year
| Term | Monthly P+I | Total interest | Total cost |
|---|---|---|---|
| 15 years | $956 | $72,017 | $172,017 |
| 30 years | $734 | $164,155 | $264,155 |
Choosing 15 years over 30 saves about $92,138 in interest at this rate and loan amount.
Extra payments
Payment breakdown
Monthly P+I
$836
Total payments
240
Total interest
$100,746
Total cost (P+I only)
$200,746
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Last updated: 2026