Realistic Home Affordability Calculator

Why the 28/36 Rule Is Outdated (And What to Use Instead)

For decades, the standard advice has been the "28/36 rule": spend no more than 28% of your gross monthly income on housing costs, and no more than 36% on total debt (housing plus other debt payments). While this rule served as a simple heuristic in an era of low interest rates, stable employment, and predictable housing costs, it falls dramatically short in today's financial landscape. Here's why the 28/36 rule is dangerously oversimplified — and what you should actually consider when determining how much home you can afford.

The Problem with the 28% Front-End Ratio

The 28% rule only accounts for your mortgage principal, interest, property taxes, and insurance (PITI). It completely ignores HOA fees, utilities, and — most critically — maintenance and repairs. A typical homeowner should budget 1–2% of the home's value per year for maintenance. On a $500,000 home, that's $5,000–$10,000 annually that never appears in the 28% calculation. When you add in HOA fees ($200–$600/month in many markets), utilities ($250–$400/month), and the hidden costs of homeownership, the true monthly housing burden can be 35–50% higher than PITI alone would suggest. A family earning $120,000 per year may hit 28% easily on paper while being genuinely house-poor in reality.

The 36% Back-End Ratio Misses the Point

The 36% total debt limit lumps all debts together and treats a car loan and maxed-out credit cards the same as a student loan with a fixed payment. It doesn't account for your disposable income, savings rate, retirement contributions, or lifestyle spending. Two families with identical DTIs may have wildly different financial health — one may be saving 20% for retirement while the other is living paycheck to paycheck. The back-end ratio also ignores the most important number: how much you have left after ALL obligations, not just debts.

A Better Framework for Home Affordability

• Consider Total Housing Cost, Not Just PITI: Include property taxes, insurance, HOA fees, utilities, and a maintenance reserve (1–2% of home value annually). This "true cost" is what you'll actually pay each month.
• Stress-Test at Higher Rates: Calculate your payment at 2% above today's rate. If you can't afford the house at 8.5% interest (assuming a 6.5% current rate), you're overextended.
• Don't Deplete Your Emergency Fund: A 20% down payment is ideal, but never drain your emergency fund to get there. You need 3–6 months of total housing costs in liquid savings after closing.
• Account for Opportunity Cost: Your down payment and closing costs (typically 3–5% of the purchase price) are capital that could be invested. A $60,000 down payment invested at 7% grows to over $230,000 in 20 years.
• Keep Your DTI Below 43% (Realistically): While conventional loans allow up to 50% DTI, staying under 43% with your total housing cost (including maintenance and HOA) is a safer benchmark.

How Our Calculator Works

Our calculator starts from your after-tax disposable income and works backward to find the maximum home price you can comfortably afford. We cap the recommended monthly housing cost (PITI + HOA + utilities + maintenance reserve) at 36% of gross income — but we show you the full breakdown so you can decide for yourself. We also calculate your true DTI ratio using your existing debt payments and the full housing cost, not just PITI. The result is a realistic picture of what home fits your budget without sacrificing your financial future.

Remember: The Bank's Approval ≠ Affordability

Banks may pre-approve you for a mortgage payment that consumes 45–50% of your gross income. That doesn't mean you should take it. Your lender doesn't know about your retirement goals, your child's education savings, your travel plans, or your tolerance for financial stress. A realistic affordability assessment accounts for the life you want to live inside the house, not just the cost of buying it. Use our calculator to find the price range where you can buy a home and still sleep soundly at night.