The short answer: at a 6.5% rate, a $400,000 30-year fixed mortgage costs $2,528.27 a month in principal and interest; at 7%, $2,661.21. On a 15-year term at 6.5% the payment is $3,484.43. Taxes, insurance, HOA and mortgage insurance (if you put less than 20% down) come on top — open this loan in the full calculator to add them and see the complete amortization schedule.
| Rate | 30-year | 20-year | 15-year |
|---|---|---|---|
| 5.00% | $2,147.29 | $2,639.82 | $3,163.17 |
| 5.25% | $2,208.81 | $2,695.38 | $3,215.51 |
| 5.50% | $2,271.16 | $2,751.55 | $3,268.33 |
| 5.75% | $2,334.29 | $2,808.33 | $3,321.64 |
| 6.00% | $2,398.20 | $2,865.72 | $3,375.43 |
| 6.25% | $2,462.87 | $2,923.71 | $3,429.69 |
| 6.50% | $2,528.27 | $2,982.29 | $3,484.43 |
| 6.75% | $2,594.39 | $3,041.46 | $3,539.64 |
| 7.00% | $2,661.21 | $3,101.20 | $3,595.31 |
| 7.25% | $2,728.71 | $3,161.50 | $3,651.45 |
| 7.50% | $2,796.86 | $3,222.37 | $3,708.05 |
At 6.5%, interest alone on $400,000 runs about $2,166.67 per month — roughly $71.23 every day. That's the number amortization slowly kills: each payment shrinks the balance, so each month a little less goes to interest and a little more to principal. See the month-by-month schedule, or try our daily interest calculator for per-diem closing math.
Principal and interest is the floor, not the payment. A realistic budget adds property taxes, homeowners insurance, HOA dues, and — under 20% down — mortgage insurance, which our full calculator prices the way a lender does: FHA and USDA from the official tables, VA's funding fee, and conventional PMI by credit score.
A common guideline caps total housing costs near 28–36% of gross income, but real qualifying depends on your full debt picture, credit and loan program. Build the complete payment in the calculator, then ask a licensed professional — Phil answers questions free.
With 20% down, a $400,000 loan buys about $500,000 of house; with 5% down, about $421,053. Enter your own down payment in the payment calculator and the price, loan and LTV solve automatically.