How Mortgage Affordability Differs from Home Affordability
The two terms are related but not the same. Home affordability is the total price you can pay for a property. Mortgage affordability is the size of loan a lender will actually approve. The gap between them is your down payment. A couple with $500,000 in affordability and $80,000 in savings has a mortgage affordability of $420,000 — the actual loan amount a lender needs to underwrite.
What Lenders Actually Evaluate
Mortgage qualification isn't just about income and debts. Lenders also evaluate your credit score, loan type (conforming vs. jumbo), property type, and reserves. This calculator focuses on the debt-to-income piece — typically the single most important factor. For a deeper view, see our how much house can I afford guide which covers credit score tiers.
Conventional vs. FHA Mortgage Qualification
Conventional loans (Fannie/Freddie) typically cap back-end DTI at 45–50%. FHA loans allow up to 43% back-end DTI standard, or 50% with compensating factors. Our first-time home buyer calculator includes an FHA mode with 3.5% down and FHA mortgage insurance premiums. If comparing loan types, our down payment calculator shows how different down amounts change qualification across programs.
A Common Qualification Surprise
Many buyers discover their pre-approval is lower than this calculator shows because lenders use exact property-specific tax figures, not averages. A home in a high-tax state like New Jersey can add $500–$900/month in taxes, reducing your loan size by $60,000–$100,000 compared to a similar price in a low-tax state like Alabama. Always use your actual local tax rate — it matters enormously.