How Much House Can You Afford? A Practical Guide

A lender can tell you the maximum amount you are approved to borrow, but that number and the amount you can genuinely afford, comfortably, are not always the same thing. Lenders approve based on debt-to-income guidelines and your ability to make the payment on paper — they do not know your other goals, your spending habits, or how much monthly breathing room you actually want to keep. Figuring out true affordability is a separate exercise worth doing before you fall in love with a home at the edge of your approval limit.

The 28/36 Rule as a Starting Point

A commonly used guideline suggests keeping your total housing costs — principal, interest, taxes, and insurance, or PITI — at or below twenty-eight percent of your gross monthly income, and your total debt payments, including housing plus any car loans, student loans, and credit card minimums, at or below thirty-six percent of gross income. This is a starting guideline rather than a hard rule, and many lenders will approve borrowers above these thresholds, particularly for well-qualified buyers — but exceeding them meaningfully increases the risk that your budget will feel tight in practice, even if it is technically approved.

Why Lender Approval Is Not the Same as Comfortable Affordability

A lender’s maximum approval amount is calculated based on your income, existing debt, and the loan’s terms, but it does not account for how much you want to save each month, how variable your income might be, or lifestyle costs that are real but do not show up as formal debt payments — things like childcare, healthcare costs, or simply the cost of living in your area. Two households with the identical income and lender-approved amount can have very different comfortable budgets depending on these factors, which is why the maximum approval figure should be treated as a ceiling, not a target.

Costs Beyond the Mortgage Payment

Owning a home comes with ongoing costs beyond PITI that renters typically do not budget for: maintenance and repairs, which conventional wisdom suggests budgeting at roughly one to two percent of the home’s value annually; utilities, which are often higher in a larger home than a rental; and HOA dues, if applicable, which can add a meaningful fixed monthly cost on top of the mortgage payment itself. Factoring in a realistic maintenance and utilities buffer, on top of PITI, gives a far more accurate picture of your true monthly housing cost.

Building Your Own Budget, Backward

Rather than starting from a lender’s maximum approval and working down, a more reliable approach is to start from your own budget: total your current income, subtract savings goals, existing debt payments, and a realistic estimate of other monthly expenses, and see what is genuinely left over for a comfortable housing payment. Use a mortgage calculator to work backward from that comfortable payment figure into an actual home price range at current rates, rather than working forward from the largest number a lender is willing to approve.

Don’t Forget the Down Payment and Closing Costs

Affordability is not only about the ongoing monthly payment — it also depends on having enough saved for a down payment and closing costs without draining your emergency fund. Closing costs typically run two to five percent of the purchase price, on top of whatever down payment you are planning, and going into homeownership with little to no financial cushion left over is one of the more common ways a technically affordable home turns into a stressful one in the first year of ownership.

Stress-Test Your Budget

Before committing to a specific price range, consider how your budget would hold up under a temporary income disruption or an unexpected large expense — a job change, a medical bill, a major repair. A home that is comfortably affordable under normal circumstances but leaves no room for any of these common disruptions is a riskier commitment than the monthly numbers alone suggest.

The Bottom Line

True affordability is a more conservative, more personal number than a lender’s maximum approval amount. Use guidelines like the 28/36 rule as a starting reference, account for maintenance, utilities, and other real costs of ownership beyond PITI, and build your budget backward from what you can comfortably sustain rather than forward from the largest loan you are approved for.