How Much House Can You Actually Afford? The 28/36 Rule and Beyond
Ask a lender how much house you can afford and you will get the maximum they are willing to hand you — which is a very different number from the amount you can carry comfortably. The gap between those two figures is where most buyer's remorse is born. This article covers the classic affordability rules, the costs that never show up in the listing price, and how interest rates quietly reshape your budget. 01 . The 28/36 rule in plain terms The most widely used affordability guideline says your housing costs — mortgage payment, property tax and insurance combined — should stay under 28% of your gross monthly income, and your total debt payments (housing plus car loans, student loans, credit cards) under 36%. A household earning $8,000 a month gross would target a housing payment of at most $2,240 and total debt service under $2,880. These percentages are not laws of physics, but they encode decades of default statistics: borrowers who cross them meaningfully are far more likely to end up stretched. Treat 28% as a ceiling, not a target — living below it converts directly into savings rate and peace of mind. 02 . Pre-approval is a sales number, not a budget Lenders typically approve up to 43–50% debt-to-income on paper. They can do that because the loan is secured by the house; your lifestyle is not their problem. A pre-approval letter tells you the most the bank will risk, while a budget should start from the life you actually want — childcare, travel, retirement contributions — and work backwards to a payment that fits around it. 03 . How interest rates move your budget The same $2,240 monthly payment buys dramatically different amounts of house depending on the rate. Over 30 years, it supports roughly a $470,000 loan at 4%, about $354,000 at 6.5%, and near $305,000 at 8%. A two-point rate move changes your purchasing power by more than most people's annual salary — which is why re-running the numbers whenever rates shift is not optional. 04 . The costs the listing never mentions Budget 1–2% of the home's value per year for maintenance and repairs — roofs, water heaters and HVAC systems fail on their own schedule, not yours. Add property taxes (often 1–2% annually), homeowner's insurance, possible HOA dues, and higher utility bills than an apartment. A realistic rule: your all-in monthly cost of owning runs 25–40% above the bare mortgage payment. If the purchase only works when none of these show up, it does not work. Takeaway: Start from the monthly payment that fits your life, apply the 28/36 rule as a hard ceiling, stress-test the number at a higher rate, and add a third to the mortgage payment for true ownership costs. The house you can afford is the one that leaves your other goals intact.