$400,000 mortgage at 5%: monthly payment over 30 and 15 years
$2,147.29 a month for 30 years, or $3,163.17 for 15: that is a $400,000 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 | $2,147.29 | $3,163.17 |
| Total interest over the term | $373,023 | $169,371 |
| Total paid (principal + interest) | $773,023 | $569,371 |
| 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
In the first year, $19,866 of the $25,767 you pay is interest; only $5,901 reduces the balance. The split reverses slowly: by year 15 most of each payment is principal.
| After | Remaining balance | Paid down |
|---|---|---|
| 5 years | $367,315 | $32,685 |
| 10 years | $325,368 | $74,632 |
| 15 years | $271,536 | $128,464 |
| 20 years | $202,449 | $197,551 |
| 25 years | $113,786 | $286,214 |
Mortgage insurance: the months that matter
If this loan was more than 80% of the home’s original value, private mortgage insurance applies until the balance falls to 80% (cancellation on request) and 78% (automatic). By the schedule alone, with no extra payments or appreciation:
| Starting LTV | Home value | 80% (request) | 78% (automatic) |
|---|---|---|---|
| 97% | $412,371 | month 115 | month 125 |
| 95% | $421,053 | month 106 | month 117 |
| 90% | $444,444 | 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.
The price of paying late
A payment received after the 15-day grace period typically costs 4% to 5% of the P&I amount — $85.89 to $107.36 here, subject to state limits. Thirty days late is the line that matters for your credit: that is when the delinquency can be reported. 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 = 5% ÷ 12 = 0.4167% 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 5%?
$2,147.29 a month for principal and interest on a 30-year fixed loan, or $3,163.17 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 5%?
$373,023 over 30 years, or $169,371 over 15 years, if every payment is made as scheduled with no extra principal. In the first year of the 30-year loan, about $19,866 of your $25,767 in payments is interest and $5,901 reduces the balance.
When can I cancel PMI on a $400,000 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 · $500,000 · $600,000 · $800,000. All tables.