$800,000 mortgage at 5%: monthly payment over 30 and 15 years
$4,294.57 a month for 30 years, or $6,326.35 for 15: that is a $800,000 mortgage at 5%, principal and interest only. Below, the full arithmetic — interest totals, amortization milestones, PMI cancellation points and late fees — from the standard formula.
| 30-year fixed | 15-year fixed | |
|---|---|---|
| Monthly principal & interest | $4,294.57 | $6,326.35 |
| Total interest over the term | $746,046 | $338,743 |
| Total paid (principal + interest) | $1,546,046 | $1,138,743 |
| Interest as a share of total paid | 48% | 30% |
Principal and interest only. Property taxes, homeowners insurance, mortgage insurance and HOA dues are added to the actual payment. Rates shown are for the arithmetic, not an offer; see 30-year vs 15-year for how to choose.
How fast the balance falls
Year one: $51,535 paid, $39,732 of it interest, $11,803 principal. That ratio is why equity builds slowly at first and why extra principal payments early are worth the most.
| After | Remaining balance | Paid down |
|---|---|---|
| 5 years | $734,630 | $65,370 |
| 10 years | $650,737 | $149,263 |
| 15 years | $543,071 | $256,929 |
| 20 years | $404,898 | $395,102 |
| 25 years | $227,572 | $572,428 |
PMI tipping points: 80% and 78%
For a borrower who put less than 20% down, the question is when the balance hits 80% and 78% of the original value. Without extra principal or a new appraisal, this loan gets there in:
| Starting LTV | Home value | 80% (request) | 78% (automatic) |
|---|---|---|---|
| 97% | $824,742 | month 115 | month 125 |
| 95% | $842,105 | month 106 | month 117 |
| 90% | $888,889 | month 79 | month 92 |
Extra principal payments or a new appraisal showing appreciation can bring cancellation forward — see PMI removal. FHA mortgage insurance follows different rules.
What a late payment costs
On a $4,294.57 payment, the usual 4% to 5% late fee is $171.78 to $214.73 once the grace period ends. The fee is the small cost; the 30-day credit mark is the large one. Behind already? The options are in our mortgage problems hub.
The formula
M = P × r(1 + r)n ÷ ((1 + r)n − 1), where P = $800,000, r = 5% ÷ 12 = 0.4167% per month, n = 360 (30 years) or 180 (15 years).
This is the standard fixed-rate amortization — the payment is constant, the interest share falls each month as the balance falls. Balance after k payments: P(1 + r)k − M((1 + r)k − 1) ÷ r.
Frequently asked questions
What is the monthly payment on a $800,000 mortgage at 5%?
$4,294.57 a month for principal and interest on a 30-year fixed loan, or $6,326.35 on a 15-year fixed loan. Property taxes, homeowners insurance, mortgage insurance and any HOA dues are added on top and typically raise the total payment by 25% to 50%.
How much interest will I pay on a $800,000 loan at 5%?
$746,046 over 30 years, or $338,743 over 15 years, if every payment is made as scheduled with no extra principal. In the first year of the 30-year loan, about $39,732 of your $51,535 in payments is interest and $11,803 reduces the balance.
When can I cancel PMI on a $800,000 loan at 5%?
By the regular schedule alone, a loan that started at 95% of the home’s value reaches 80% loan-to-value in month 106 (when you may request cancellation) and 78% in month 117 (automatic cancellation). Extra principal payments or an appraisal showing appreciation can move that earlier.
Same amount, other rates: 6% · 7% · 8%. Same rate, other amounts: $150,000 · $200,000 · $250,000 · $300,000 · $350,000 · $400,000 · $500,000 · $600,000. All tables.