Home Affordability Calculator USA 2026
Enter your income, monthly debts, and down payment. The calculator applies standard lender DTI rules to show the maximum home price you can likely qualify for.
How Home Affordability Is Calculated
Lenders use two key DTI (Debt-to-Income) ratios to determine how much you can borrow. The front-end ratio limits your housing payment as a percentage of gross income. The back-end ratio limits your total debt including the new mortgage.
2026 DTI Guidelines by Loan Type
| Loan Type | Front-End DTI | Back-End DTI | Min. Down Payment |
|---|---|---|---|
| Conventional (Fannie/Freddie) | 28% | 36–45% | 3–20% |
| FHA Loan | 31% | 43% | 3.5% (580+ credit) |
| VA Loan | No limit | 41% | 0% (veterans) |
| USDA Loan | 29% | 41% | 0% (rural areas) |
| Jumbo Loan | 36% | 43–50% | 10–20% |
The 28/36 Rule Explained
The traditional guideline says your monthly housing costs (principal, interest, taxes, insurance) should not exceed 28% of gross monthly income, and your total monthly debts should not exceed 36%. Many modern lenders are more flexible, allowing up to 43–50% back-end DTI.
Frequently Asked Questions
What This Home Affordability Calculator Does
This calculator determines the maximum home price you can afford based on your gross income, monthly debts, down payment, credit-score-driven interest rate, and the standard debt-to-income ratios lenders use. It shows both what you can qualify for (lender's view) and what you can actually afford comfortably (financial planning view) — two numbers that sometimes differ significantly.
The Debt-to-Income Ratio
Lenders use DTI (debt-to-income ratio) as their primary affordability metric. Your total monthly debt payments (proposed mortgage including taxes and insurance, plus all existing debts) divided by gross monthly income gives your total DTI. Most conventional lenders require total DTI at or below 45%; some go to 50% with strong compensating factors. FHA loans allow up to 57% in some cases.
The "28/36 rule" is a traditional guideline: housing costs shouldn't exceed 28% of gross income; total debt payments shouldn't exceed 36%. This is stricter than current lending standards but represents a more comfortable financial cushion in practice.
Lender Qualification vs. Comfortable Affordability
A lender may approve you for a $450,000 mortgage. That doesn't mean you should buy a $450,000 home. Qualification is based on gross income; your daily life runs on net income after taxes. Lenders don't account for childcare, retirement contributions, car maintenance, or medical costs in DTI calculations. A home that meets lender criteria but consumes 35%–40% of your net income rarely leaves room for financial stability or life events.
A conservative personal standard: housing costs (PITI — principal, interest, taxes, insurance) at no more than 25%–30% of net take-home pay, leaving room for savings, transportation, and discretionary spending.
Down Payment and Its Effects
Down payment determines loan size (and therefore monthly payment), whether PMI is required, the interest rate available, and your immediate equity cushion. Below 20% down, conventional loans require private mortgage insurance (PMI), typically 0.5%–1.5% of the loan balance annually, adding $100–$300/month on a $300,000 loan.
A larger down payment reduces your loan amount, eliminates PMI above 20%, and often qualifies for a marginally lower rate. But tying up all available cash in a down payment leaves no emergency fund — which is a separate risk worth weighing.
Real-World Examples
$90,000 Household Income
Gross monthly income: $7,500. Standard lender maximum (43% DTI, $300/month in existing debts): total debt capacity $3,225/month, minus $300 existing = $2,925 for PITI. At 6.75% rate with 10% down on a 30-year mortgage, this supports a purchase price around $380,000–$400,000 depending on property taxes and insurance.
Comfortable personal standard (25% of net ~$5,800/month): $1,450/month for PITI — suggesting a much more conservative $200,000–$220,000 purchase. The gap illustrates why lender approval and personal comfort diverge.
Tips and Best Practices
- Get pre-approved before shopping — not pre-qualified. Pre-approval involves actual income verification and credit pull; pre-qualification is just an estimate.
- Model the total monthly payment, not just purchase price — property taxes, insurance, PMI, and HOA can add $500–$1,500/month beyond principal and interest.
- Don't borrow the maximum — lender maximums reflect credit risk limits, not financial wisdom. Build in a buffer for job changes, repairs, and life events.
Related Calculators
- Mortgage Calculator — detailed monthly payment for a specific purchase price.
- Closing Costs Calculator — cash needed beyond down payment.
- Rent vs. Buy Calculator — financial comparison of buying vs. continuing to rent.
Frequently Asked Questions
How much should I put down on a house?
Enough to avoid PMI if possible (20%), but not so much that you have no emergency fund. A 10%–15% down payment that preserves 3–6 months of expenses in savings is often better than a 20% down that depletes your liquidity entirely.
Does my income include bonuses?
Lenders typically average bonus income over 2 years if it's been consistent and documented. If bonuses are irregular or new, lenders may exclude them. Only use bonuses in your own affordability math if they've been reliable for at least 2 years.
What credit score do I need to buy a house?
Conventional loans typically require 620+, with significantly better rates at 740+. FHA loans go as low as 500 with 10% down (or 580 with 3.5% down). The rate difference between a 620 and 760 score can be 0.5%–1.5% — on a $350,000 loan, that's $100–$200/month and $36,000–$72,000 over 30 years.
Key Takeaways
Affordability is two separate questions: what lenders will approve, and what's financially sustainable for your household. These answers sometimes differ by $100,000 or more. Build your budget around housing costs as a percentage of net take-home pay, maintain liquidity for repairs and emergencies, and use lender approval as a ceiling — not a target.