How Much Income Do I Need for a $400K House?
Buying a $400,000 home requires enough gross income to keep your housing payment within the conventional 28 percent front-end DTI limit. With 20 percent down, the $320,000 loan at an illustrative 7 percent rate produces approximately $2,129 per month in principal and interest. Add taxes and insurance and you need roughly $108,000 to $113,000 annually. Enter your numbers above.
Your budget
$0
a $0 loan at 0% loan-to-value
- Principal & interest
- $0.00
- Property tax
- $0.00
- Home insurance
- $0.00
- PMI
- $0.00
- HOA dues
- $0.00
- Total monthly
- $0.00
This works backwards from the payment you named. It says nothing about whether a lender will approve you — for that, start from income and debts instead.
How Down Payment Changes the Income Requirement
The less you put down, the more you borrow — and the higher the income you need. On a $400,000 purchase, 20 percent down means a $320,000 loan. At an illustrative 7 percent rate over 30 years, principal and interest alone total approximately $2,129 per month. Add $400 to $500 for property taxes and insurance, and total housing cost reaches roughly $2,529 to $2,629. To stay at or below the conventional 28 percent front-end ratio, you need an annual gross income of approximately $108,000 to $113,000.
Drop the down payment to 10 percent and the loan grows to $360,000, pushing principal and interest to about $2,395. With taxes, insurance, and PMI the housing payment can approach $3,000, requiring gross income in the $125,000 to $130,000 range. The additional PMI cost compounds the gap, making a larger down payment doubly effective — it shrinks the loan and eliminates the insurance premium.
Existing Debts and the Back-End Ratio
Front-end DTI is only half the qualification picture. The back-end ratio — total monthly debts divided by gross income — caps at 36 percent under conventional guidelines and 43 percent under the qualified-mortgage ceiling. A car payment of $400 and student-loan minimums of $300 already consume $700 per month. For a borrower needing $2,629 for housing, total obligations reach $3,329, requiring a gross income of at least $110,960 just to meet the 36 percent back-end threshold.
Because both ratios must be satisfied simultaneously, the more restrictive one governs. Borrowers with low existing debt find the front-end ratio binding. Those carrying significant obligations hit the back-end wall first, and the required income climbs accordingly.
Use the salary-based affordability calculator to explore the same question from the income side, or the DTI calculator to see exactly where your ratios stand before applying.
All payment examples use illustrative rates. Actual lender requirements include reserves, credit-score minimums, and programme-specific DTI overlays.