Introduction
Getting pre-approved for a mortgage is exciting — the bank tells you that you qualify for $550,000, and suddenly that number becomes your house budget. But pre-approval is not the same as affordability. Lenders are in the business of making loans, and they will lend you as much as their risk models allow — not as much as your personal budget can comfortably handle. Understanding the difference can protect you from becoming "house poor."
The 28/36 Rule
The classic affordability guideline is the 28/36 rule. Your housing costs (mortgage principal, interest, property taxes, and insurance — called PITI) should not exceed 28% of your gross monthly income. Your total debt payments (PITI plus car loans, student loans, credit cards) should not exceed 36%. If your gross income is $8,000/month, these rules suggest a maximum housing payment of $2,240/month and maximum total debt of $2,880/month. These are ceilings, not targets — you can and should aim lower if you value financial flexibility.
What Lenders Actually Approve
Modern lenders routinely approve borrowers with front-end ratios up to 31% and back-end ratios up to 43–50%, especially for FHA loans. Some programs allow even higher. This means the bank may approve you for a payment that consumes nearly half your income — a payment that leaves little room for savings, emergencies, or lifestyle expenses. The bank's approval limit is a maximum, not a recommendation.
True Affordability: The Full Cost of Homeownership
Property taxes vary widely by location — 0.5% to 2.5% of home value per year. Homeowner's insurance typically runs $1,000–$2,500/year. PMI if you put down less than 20%: 0.5%–1.5% of the loan amount per year. HOA fees if applicable: $200–$1,000/month in many communities. Maintenance: budget 1%–2% of home value annually. A $400,000 home can easily cost $3,500–$4,500/month all-in when these are included — not just the mortgage payment.
A Better Framework
Rather than starting with what the bank will lend, start with your monthly budget. List your take-home pay, subtract all non-housing expenses, required savings (retirement, emergency fund), and discretionary spending you value. What's left is your true housing budget. Many financial advisors suggest keeping total housing costs (including taxes, insurance, maintenance reserve) under 25–30% of take-home pay rather than gross income.
Conclusion
The right home price is the one where your monthly payment leaves you financial breathing room. Use our Mortgage Calculator to model different purchase prices, down payments, and rates to find the payment that feels sustainable — not just technically approvable.