How Much House Can You Really Afford?

“How much house can I afford?” has two very different answers: the amount a lender will approve, and the amount you can comfortably live with. They are rarely the same number, and the gap between them is where a lot of financial stress is born.

The 28/36 rule, explained

The oldest and most useful guideline is the 28/36 rule. It puts two ceilings on your monthly spending:

• 28% (the front-end ratio): your total monthly housing payment — principal, interest, property taxes, and insurance — should stay under 28% of your gross monthly income.
• 36% (the back-end ratio): all of your monthly debt payments combined — housing plus car loans, student loans, and minimum credit card payments — should stay under 36%.

Whichever limit is lower is your real ceiling. Someone with significant car or student-loan payments will hit the 36% wall first, which is why existing debt shrinks your home budget so dramatically.

The costs buyers forget

A common mistake is budgeting only for principal and interest — the number a mortgage calculator shows first. Your actual monthly housing cost also includes:

• Property taxes, which vary widely by location.
• Homeowner’s insurance, required by lenders.
• Private mortgage insurance (PMI) if your down payment is under 20%.
• Maintenance— a rough rule of thumb is 1% of the home’s value per year.
• HOA dues, where applicable.

This is why our home affordability calculator reserves part of your housing budget for taxes and insurance before working out the loan you can support.

Why borrowing the maximum is risky

Lenders profit from larger loans, so they often approve more than the 28/36 rule suggests. Stretching to that maximum leaves no cushion for a rate change on an adjustable loan, a job disruption, or the simple reality that life costs more than a spreadsheet predicts. A payment that looks fine on paper can feel suffocating when the water heater fails the same month the car needs tires.

A sensible process

1. Start with the home affordability calculator to find a price the 28/36 rule supports.
2. Plug that price into the mortgage calculator to see the principal-and-interest payment, then add your local taxes and insurance.
3. If you’re not sure buying is right at all, run the rent vs buy calculator for your time horizon.
4. Pick a number below your ceiling — your future self will thank you for the breathing room.

The goal isn’t the biggest house you can finance. It’s a home that fits your life and your budget, with room left over to keep building everything else.