$800,000 Mortgage at 5% for 15 Years

A $800,000 mortgage at 5% over 15 years has a monthly principal + interest payment of $6,326. You'll pay $338,743 in total interest, bringing total loan cost to $1,138,743.

Estimated monthly payment
$7,451
Principal + interest
$6,326
Property tax
$1,000
Home insurance
$125
PMI
$0
HOA
$0
Total monthly
$7,451
1st month interest
$3,333
1st month principal
$2,993
Total interest
$338,743
Balance after 1 year
$763,249
Balance after 5 years
$596,457
Total cost (P+I)
$1,138,743

Amortization (first 10 years)

YearPrincipalInterestBalance
1$36,751$39,165$763,249
2$38,631$37,285$724,618
3$40,607$35,309$684,011
4$42,685$33,231$641,326
5$44,869$31,047$596,457
6$47,164$28,752$549,292
7$49,577$26,339$499,715
8$52,114$23,802$447,601
9$54,780$21,136$392,821
10$57,583$18,333$335,238

15-year vs 30-year

TermMonthly P+ITotal interestTotal cost
15 years$6,326$338,743$1,138,743
30 years$4,295$746,046$1,546,046

Choosing 15 years over 30 saves about $407,303 in interest at this rate and loan amount.

Extra payments

Payment breakdown

Monthly P+I
$6,326
Total payments
180
Total interest
$338,743
Total cost (P+I only)
$1,138,743
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Last updated: 2026