How Much House Can You Afford? An Affordability Guide

Lenders will often approve you for a larger loan than you should comfortably take on. The amount you qualify for and the amount you can comfortably live with are two different numbers. A mortgage that leaves no room for savings, emergencies, or fun is a recipe for stress. Affordability comes down to four levers: your income, your existing debts, your down payment, and the interest rate. Change any one of them and the price you can support moves. This guide explains the common rules of thumb lenders use so you can run realistic scenarios before stepping into a lender's office. This is general education, not financial advice — your situation is unique, and a mortgage professional can give tailored guidance. To put real numbers behind these rules, the mortgage calculator estimates monthly payments instantly and privately in your browser.

The most widely used affordability guideline is the 28/36 rule. The first number says your total monthly housing payment should stay at or below 28% of your gross (pre-tax) monthly income. The second says your total monthly debt — housing plus car loans, student loans, credit card minimums, and so on — should stay at or below 36%. Here is a worked example. Suppose your household earns $6,000 in gross income per month. Then 28% of $6,000 is $1,680, which is your target ceiling for housing costs. And 36% of $6,000 is $2,160, your ceiling for all debt combined. If you already pay $300 a month toward a car loan, that leaves $1,860 for housing under the 36% test — but the 28% test still caps housing at $1,680, so the lower figure wins. These percentages are guidelines, not laws, and lenders vary. But staying inside them gives you a strong buffer.

The 36% figure above is really a debt-to-income (DTI) ratio: total monthly debt payments divided by gross monthly income, expressed as a percentage. Lenders lean heavily on DTI because it measures how stretched your budget already is. Using the same household, $2,160 of total debt against $6,000 of income is a 36% DTI. Many lenders prefer a DTI below 36%, though some loan programs allow higher. The lower your DTI, the more comfortably you can absorb a rate increase, a job change, or an unexpected expense. Before house-hunting, calculate your current DTI and see how much headroom you have. The debt-to-income calculator does this for you, and paying down a card or two can noticeably improve the price range you qualify for.

Your down payment shapes both your monthly payment and your upfront costs. The classic target is 20% of the home price — on a $300,000 home that is $60,000. Hitting 20% matters for one specific reason: private mortgage insurance. PMI is an extra monthly charge that protects the lender (not you) when your down payment is below roughly 20%. It typically ranges from about 0.3% to 1.5% of the loan amount per year and is added to your payment until you build enough equity. A smaller down payment is not wrong — many buyers put down far less — but you should budget for PMI and a higher monthly cost. A larger down payment also shrinks the loan, which lowers both the monthly payment and the lifetime interest. Run a few down-payment scenarios in the mortgage calculator to see the trade-off clearly.

The monthly principal-and-interest payment is only part of the picture. Property taxes, homeowners insurance, PMI, and any HOA dues all add up — together these are often abbreviated PITI plus HOA. Beyond that, owning a home means maintenance, repairs, and the occasional large surprise like a roof or a water heater. A common piece of guidance is to keep a cushion for these costs rather than spending right up to your approved limit. If rates fall later, refinancing may lower your payment, so it helps to understand how that math works too. The refinance calculator shows whether the savings would outweigh the closing costs. Put it all together: estimate your 28/36 ceilings, check your DTI, decide on a down payment, then test prices in the calculator until the all-in monthly figure feels sustainable — not just approvable. That is the number that protects your future self.