$400,000 mortgage at 6%: monthly payment over 30 and 15 years
At 6%, a $400,000 mortgage amortizes at $2,398.20 a month over 30 years and $3,375.43 over 15. This page lays out the consequences of that rate on that balance, all computed: interest paid, equity built, when PMI ends, and the cost of paying late.
| 30-year fixed | 15-year fixed | |
|---|---|---|
| Monthly principal & interest | $2,398.20 | $3,375.43 |
| Total interest over the term | $463,353 | $207,577 |
| Total paid (principal + interest) | $863,353 | $607,577 |
| Interest as a share of total paid | 54% | 34% |
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
Early payments are mostly interest: $23,866 of year one’s $28,778 goes to the lender as interest and $4,912 to your balance. The balance below shows the curve.
| After | Remaining balance | Paid down |
|---|---|---|
| 5 years | $372,217 | $27,783 |
| 10 years | $334,743 | $65,257 |
| 15 years | $284,195 | $115,805 |
| 20 years | $216,014 | $183,986 |
| 25 years | $124,048 | $275,952 |
Mortgage insurance: the months that matter
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% | $412,371 | month 127 | month 138 |
| 95% | $421,053 | month 118 | month 129 |
| 90% | $444,444 | month 89 | month 103 |
Extra principal payments or a new appraisal showing appreciation can bring cancellation forward — see PMI removal. FHA mortgage insurance follows different rules.
Late fees and the 30-day line
Late fee at day 16: usually 4% to 5% of $2,398.20, so $95.93 to $119.91 (states cap the percentage). Credit reporting at day 30. Foreclosure referral no sooner than 120 days of delinquency under federal rules. If a payment is genuinely at risk, read what to do this month.
The arithmetic behind the table
M = P × r(1 + r)n ÷ ((1 + r)n − 1), where P = $400,000, r = 6% ÷ 12 = 0.5000% per month, n = 360 (30 years) or 180 (15 years).
Same formula every lender uses; differences between quotes come from the rate, points and fees, never from the arithmetic. Balance after k payments: P(1 + r)k − M((1 + r)k − 1) ÷ r.
Frequently asked questions
What is the monthly payment on a $400,000 mortgage at 6%?
$2,398.20 a month for principal and interest on a 30-year fixed loan, or $3,375.43 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 $400,000 loan at 6%?
$463,353 over 30 years, or $207,577 over 15 years, if every payment is made as scheduled with no extra principal. In the first year of the 30-year loan, about $23,866 of your $28,778 in payments is interest and $4,912 reduces the balance.
When can I cancel PMI on a $400,000 loan at 6%?
By the regular schedule alone, a loan that started at 95% of the home’s value reaches 80% loan-to-value in month 118 (when you may request cancellation) and 78% in month 129 (automatic cancellation). Extra principal payments or an appraisal showing appreciation can move that earlier.
Same amount, other rates: 5% · 7% · 8%. Same rate, other amounts: $150,000 · $200,000 · $250,000 · $300,000 · $350,000 · $500,000 · $600,000 · $800,000. All tables.