$800,000 Mortgage at 8% for 20 Years
A $800,000 mortgage at 8% over 20 years has a monthly principal + interest payment of $6,692. You'll pay $805,965 in total interest, bringing total loan cost to $1,605,965.
Estimated monthly payment
$7,817
Principal + interest
$6,692
Property tax
$1,000
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$7,817
1st month interest
$5,333
1st month principal
$1,358
Total interest
$805,965
Balance after 1 year
$783,091
Balance after 5 years
$700,205
Total cost (P+I)
$1,605,965
Amortization (first 10 years)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $16,909 | $63,389 | $783,091 |
| 2 | $18,313 | $61,985 | $764,778 |
| 3 | $19,833 | $60,465 | $744,945 |
| 4 | $21,479 | $58,819 | $723,466 |
| 5 | $23,262 | $57,037 | $700,205 |
| 6 | $25,192 | $55,106 | $675,012 |
| 7 | $27,283 | $53,015 | $647,729 |
| 8 | $29,548 | $50,751 | $618,181 |
| 9 | $32,000 | $48,298 | $586,181 |
| 10 | $34,656 | $45,642 | $551,525 |
15-year vs 30-year
| Term | Monthly P+I | Total interest | Total cost |
|---|---|---|---|
| 15 years | $7,645 | $576,139 | $1,376,139 |
| 30 years | $5,870 | $1,313,242 | $2,113,242 |
Choosing 15 years over 30 saves about $737,103 in interest at this rate and loan amount.
Extra payments
Payment breakdown
Monthly P+I
$6,692
Total payments
240
Total interest
$805,965
Total cost (P+I only)
$1,605,965
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Nearby scenarios
$750,000 · 8% · 20 yr
$6,273/mo
$850,000 · 8% · 20 yr
$7,110/mo
$700,000 · 8% · 20 yr
$5,855/mo
$900,000 · 8% · 20 yr
$7,528/mo
$800,000 · 7.5% · 20 yr
$6,445/mo
$800,000 · 8.5% · 20 yr
$6,943/mo
$800,000 · 7% · 20 yr
$6,202/mo
$800,000 · 9% · 20 yr
$7,198/mo
$800,000 · 8% · 15 yr
$7,645/mo
$800,000 · 8% · 30 yr
$5,870/mo
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Last updated: 2026