Wondering if you can afford a $400k house? See the exact monthly payment, required income, down payment options, and closing costs. Use our free calculator to check your numbers.
📊 The Short Answer
To comfortably afford a $400,000 home with a 20% down payment at 6.5% interest, you need an annual income of approximately $104,000 and about $90,000 in cash for the down payment and closing costs. With 10% down, you need $116,000 in income but only $50,000 in cash. The exact numbers depend on your debt, credit score, and local property taxes.
Monthly Payment (20% down, 6.5%)
Principal & interest: $2,024. Property tax (~1.1%): $268. Insurance: $133.
Required Annual Income (28% rule)
Based on 28% front-end DTI ratio. With other debts, you may need more.
Cash Needed at Closing (20% down)
$80,000 down payment + ~$9,600 closing costs (2-3% of loan amount).
Monthly Payment (10% down, 6.8%)
Higher rate due to PMI. Principal & interest: $2,087. PMI: $175. Tax: $367. Insurance: $133.
Total Cost Over 30 Years (20% down)
$320,000 loan. Total interest paid: ~$408,649 plus taxes and insurance.
| Down Payment | Loan Amount | Monthly P&I | PMI | Total Monthly | Cash Needed | Income Required |
|---|---|---|---|---|---|---|
| 5% ($20,000) | $380,000 | $2,478 | $206 | $2,882 | $31,400 | $124,000 |
| 10% ($40,000) | $360,000 | $2,348 | $195 | $2,762 | $50,800 | $118,000 |
| 15% ($60,000) | $340,000 | $2,215 | $92 | $2,480 | $70,200 | $106,000 |
| 20% ($80,000) | $320,000 | $2,024 | $0 | $2,425 | $89,600 | $104,000 |
| 25% ($100,000) | $300,000 | $1,897 | $0 | $2,224 | $109,000 | $95,000 |
Monthly payment is calculated using the standard amortization formula: M = P[r(1+r)^n]/[(1+r)^n - 1], where P = loan amount, r = monthly interest rate, n = total payments. Affordability uses the 28/36 rule: housing costs should not exceed 28% of gross monthly income, and total debt payments should not exceed 36%.
Outcome: Monthly payment drops to ~$1,819. Required income falls to $78,000. Cash needed: $67,200.
Pros
Cons
Outcome: If you save $1,500/month for 2 years, you accumulate $36,000 more toward a down payment.
Pros
Cons
💡 What This Means For You
A $400,000 home is achievable for households earning $104,000+ with $90,000 in savings. If you have less saved, a 10% down payment is possible but costs $337/month more due to PMI and higher rates. The 30-year total cost of ~$873,000 means you'll pay more than double the purchase price in principal, interest, taxes, and insurance. Run the numbers yourself using our mortgage affordability calculator below.
With 20% down at 6.5% interest, you need approximately $104,000 in annual income following the 28% front-end DTI rule. This assumes you have no other significant debts. If you have $500/month in other debt payments, you'll need closer to $120,000.
Conventional loans typically require 620+. For the best rates (6.5% in our example), aim for 740+. FHA loans accept 580+ with 3.5% down, but you'll pay mortgage insurance for the life of the loan.
It depends on your market. In high-cost areas (CA, NY, MA), $400k is below median. In the Midwest or South, $400k buys a large, newer home. The national median home price is approximately $420,000 as of 2026.
20% down eliminates PMI ($175-206/month savings) and gives you the best rate. But it ties up $80,000 in an illiquid asset. If you can afford the higher monthly payment, 10-15% down preserves cash for emergencies and investments.
Closing costs (2-5% of loan amount) add $6,400-$16,000 to your cash needed. On a $320,000 loan, expect $8,000-$9,600. You can sometimes negotiate seller credits or roll closing costs into the loan rate (higher rate, lower upfront cost).
Important Disclaimer — Not Financial Advice
The results from this calculator are for informational and educational purposes only. They are not a guarantee of actual outcomes and should not be considered financial, investment, tax, or legal advice. Always consult a qualified professional for advice tailored to your specific financial situation. See our Terms of Service and Privacy Policy for more information.
Last reviewed by Qasem Mohammed — May 31, 2026
AI & Software Engineer, Founder & Lead Developer at QFINHUB · Editorial Policy