How Much House Can I Actually Afford on My Income?

What we checked — and why the bank's number isn't the right number

To answer this question honestly, we reviewed the academic and consumer finance literature on housing cost burden, examined the underwriting standards used by major lenders and the agencies that back their loans (Fannie Mae, Freddie Mac, FHA), cross-referenced historical data on mortgage default and financial distress rates against debt-to-income ratios, and looked at what independent financial planning organizations actually recommend to clients — as opposed to what lenders are permitted to approve. The gap between those two numbers is significant, and it's the gap that puts people in trouble.

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  Lender approval limits reviewed Fannie Mae and FHA guidelines permit debt-to-income ratios up to 45–50%, but approval eligibility is not the same as financial comfort — lenders profit from larger loans regardless of your financial health.
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  Housing cost burden research examined The U.S. Department of Housing and Urban Development (HUD) defines households spending more than 30% of gross income on housing as "cost-burdened" — a threshold backed by decades of research showing elevated rates of missed payments, reduced retirement savings, and food insecurity above that level.
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  True ownership costs calculated Property taxes, homeowner's insurance, PMI, HOA fees, and maintenance (averaging 1–2% of home value annually) were incorporated — costs that online mortgage calculators frequently omit and that materially change the real monthly burden.
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  Independent financial planning standards cross-referenced The CFP Board and National Foundation for Credit Counseling both recommend the 28/36 rule as a durable personal guideline — not because it's conservative for its own sake, but because the data consistently shows households above those thresholds have less financial resilience when income disruptions occur.

There's more than one way to approach this — here's how to choose yours

Your situation — income stability, existing debt, savings cushion, and local market — will determine which approach fits best. Here are the four frameworks worth knowing.

What people use to decide — and why it leads them astray

These approaches feel intuitive and are widely repeated, but they either overstate what you can afford or leave out the costs that do the most damage to monthly budgets.

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  Using the pre-approval letter as your budget — A mortgage pre-approval tells you the maximum a lender will give you under current guidelines, not what you can afford without financial stress; lenders are in the business of lending, and a 45% DTI approval is legal but not comfortable for most households.
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  Running numbers in an online mortgage calculator without adding taxes, insurance, and maintenance — A calculator showing a $1,600/month payment on a $300,000 home at 6.8% interest is not showing you the real cost; add typical property taxes, insurance, and a 1% maintenance reserve and that same home often costs $2,200–$2,500 per month — a $600–$900 monthly gap that surprises a lot of first-time buyers in year one.
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  Relying on "what your friends paid" or local market norms — What your neighbors bought, what's considered normal in your city, or what real estate agents suggest as a "comfortable" price range is calibrated to the market — not to your specific income, debt load, or savings rate; these anchors reliably push buyers toward the top of their range rather than the middle.
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  Counting on future income increases to make the payment work — Buying a home based on a salary you expect to earn — rather than the salary you currently earn — is one of the most common drivers of mortgage distress; income growth is never guaranteed, and the payment is due every month regardless.