How Much House Can I Afford
Find out how much house you can afford based on your income, monthly debts, and down payment. This calculator uses the 28/36 rule that lenders rely on to determine your maximum home price and monthly payment breakdown.
The 28/36 Rule Explained
The 28/36 rule is the most widely used guideline in mortgage lending. The front-end ratio (28%) limits your total housing costs — including mortgage principal, interest, property taxes, and homeowners insurance (PITI) — to no more than 28% of your gross monthly income. The back-end ratio (36%) limits all monthly debt obligations, including housing plus car loans, student loans, credit card minimums, and other debts, to 36% of gross monthly income. This calculator uses whichever ratio produces the lower maximum payment, ensuring a conservative and realistic estimate of how much house you can afford.
Affordability Formula
Max Housing Payment = Gross Monthly Income × 28%
Max Total Debt Payment = Gross Monthly Income × 36%
Max Mortgage (P&I) = Max Payment − Taxes − Insurance
Max Loan = PMT × [(1 − (1 + r)−n) / r]
Max Home Price = Max Loan + Down Payment
How Lenders Determine Affordability
Mortgage lenders look at several factors beyond the 28/36 rule. Your credit score affects the interest rate you qualify for — higher scores mean lower rates and more buying power. Lenders verify employment history and income stability, typically requiring at least two years of consistent employment. They also examine your savings for the down payment, closing costs (usually 2-5% of the home price), and cash reserves. Some government-backed loan programs like FHA allow higher debt-to-income ratios (up to 43% or even 50% in some cases), which can increase the amount of house you can afford.
Factors That Affect How Much House You Can Afford
Several variables directly impact your home buying budget. Interest rates have an outsized effect — a 1% increase in rate can reduce your buying power by roughly 10%. Property tax rates vary significantly by location, from under 0.5% in Hawaii to over 2% in New Jersey and Illinois. Your down payment size matters too; putting 20% down eliminates private mortgage insurance (PMI), which can cost $100-$300 per month. The loan term also plays a role: 15-year mortgages have higher monthly payments but lower total interest costs compared to 30-year loans.
Hidden Costs of Homeownership
The purchase price is just the beginning. Budget for closing costs (2-5% of the purchase price), home maintenance (1-2% of home value annually), potential HOA fees ($200-$400/month in many communities), utilities, and home furnishing. Many financial advisors recommend keeping your total housing costs below 25% of gross income to leave room for these additional expenses. Unexpected repairs like a new roof ($8,000-$15,000) or HVAC replacement ($5,000-$10,000) can strain budgets that are already stretched to the maximum.
Tips for First-Time Homebuyers
Start by getting pre-approved for a mortgage — this tells you exactly what lenders will offer and makes your offers more competitive. Consider first-time buyer programs that offer down payment assistance or reduced PMI requirements. Build an emergency fund covering 3-6 months of housing payments before buying. Shop around with at least three lenders, as rates and fees can vary significantly. Finally, remember that the calculator shows your maximum — buying below your limit gives you financial breathing room for life changes, rate increases on adjustable mortgages, and long-term wealth building through investments.