There are two answers to this question — the most a lender will give you, and the most you should actually spend. They are rarely the same. Here is how to find both, and why the second number is the one that matters.
When you ask “how much house can I afford,” a lender answers with the maximum — the largest loan your income and debts will support. That number is useful, but it is a ceiling, not a target.
The number that actually matters is your comfortable budget — the payment that leaves room for savings, the rest of your life, and the real costs of owning a home that no pre-approval letter mentions. This guide covers how lenders set the ceiling, and how to set your own honest figure under it.
Lenders judge affordability mostly through your debt-to-income ratio (DTI) — your total monthly debt payments divided by your gross monthly income, as a percentage. The new mortgage payment is included in that total. A lower DTI means more room for a mortgage and generally better terms.
Three inputs drive the lender’s number:
Run those through pre-approval and you get the ceiling. But notice what the lender does not see: your savings goals, your other plans, and the ongoing cost of actually living in the home.
To find the figure you should actually spend, account for what the lender’s maximum leaves out:
A practical method: estimate the full monthly housing cost for a price range using the mortgage calculator, then ask whether that payment still leaves comfortable room for saving and living. The right house is the one whose payment you would be glad to make in a hard month — not just an easy one. That figure, not the lender’s ceiling, is your answer.
Affordability depends on your income, your existing debts, your down payment, and the full monthly cost of the home — principal, interest, taxes, insurance, and upkeep. Lenders use debt-to-income ratios to set a maximum, but your own comfortable budget is often lower than that maximum.
A debt-to-income ratio, or DTI, compares your total monthly debt payments to your gross monthly income, as a percentage. Lenders use it to judge how much additional mortgage payment you can carry. A lower DTI generally means you can qualify for more and at better terms.
A larger down payment lowers the amount you finance, reduces the monthly payment, and can remove the need for mortgage insurance. There is no single required amount — programs vary — but more down means a smaller loan and a lower total cost.
A pre-approval shows the largest loan you qualify for, based on income and debts. It does not account for savings goals, lifestyle, or the full cost of homeownership like maintenance and utilities. A comfortable budget is usually below the lender’s maximum.
Keep building your plan before you buy:
