Ask a bank how much house you can afford and you will get the maximum they are willing to lend. That number is not advice. It is a ceiling, and living at the ceiling is how people end up house poor, owning a home they cannot comfortably afford to live in. The better question is not what you can borrow. It is what payment fits your life.
The 28 Percent Guideline
A long-standing guideline says housing costs should stay within 28 percent of your gross monthly income, and total debts including housing should stay within 36 percent. This is known as the 28/36 rule. It is not a law, but it exists for a reason: it leaves room for food, transport, savings, and the surprises life always delivers. A payment that eats 40 or 45 percent of your income leaves no margin, and one job loss or one major repair turns a home into a burden.
Why PITI Matters More Than Principal Alone
Lenders judge affordability on PITI: principal, interest, taxes, and insurance. Principal and interest is only part of the bill. Property taxes depend on where you buy, and in high-tax areas they can rival the loan payment itself. Insurance adds more. A home that looks affordable on principal alone can fail the PITI test once the full payment is counted. Any affordability check that ignores taxes and insurance is not a real check.
A Real Example
Take a household earning 90,000 dollars a year, or 7,500 dollars a month, with 350 dollars in other monthly debts and a 40,000 dollar down payment. At a 6.5 percent rate over 30 years, the comfortable PITI lands at 2,100.00 dollars a month, exactly 28 percent of gross income. That supports a maximum home price of 297,460.83 dollars, with a loan of 257,460.83 dollars and a principal and interest payment of 1,627.33 dollars. Notice what the math does: it starts from income and works forward to a price, instead of starting from a dream house and working backward to a payment you hope you can make.
Three Things That Shrink Your Budget
The first is existing debt. Car payments, student loans, and credit card minimums all count against the 36 percent total, and they shrink the house you can carry. The second is a small down payment, which raises the loan amount and can add mortgage insurance on top. The third is location: the same house in a high-tax area costs more every month than in a low-tax area, even at the same price and rate. People shop for houses. They should also shop for tax bills.
Check Before You Shop
Before you tour a single home, run your own figures through a free house affordability calculator with your income, debts, down payment, and rate. Then test the monthly payment behind that price with a mortgage calculator. The two numbers should agree. If they do not, trust the lower one. A home that fits your budget is not a compromise. It is the only kind of home worth buying.
