How much house you can afford comes down to a few rules of thumb, not a single magic number. The most common is the 28/36 rule: aim to keep your monthly housing costs near 28 percent of your gross monthly income, and your total debt payments near 36 percent. Just as important, what a lender will approve is usually more than what you can comfortably live with, because the approval ignores your real life — childcare, travel, savings goals, and the surprise costs of owning. This is general guidance, not personalized advice; run your own numbers and talk to a professional.
The 28/36 rule explained
The rule has two parts, both based on gross (pre-tax) monthly income:
- The front-end ratio (28 percent). Your total housing payment — mortgage principal, interest, property taxes, and insurance — should stay around 28 percent of gross income.
- The back-end ratio (36 percent). All your monthly debt payments combined — housing plus car loans, student loans, and minimum credit-card payments — should stay around 36 percent.
These are guidelines, not laws. Some lenders allow higher ratios, and some careful buyers deliberately stay below them. The point is to leave room for the rest of your life.
What lenders look at
| Factor |
Why it matters |
| Debt-to-income ratio |
Caps how much they will lend |
| Credit score |
Sets your interest rate and approval |
| Down payment |
Affects loan size and extra insurance |
| Stable income |
Proves you can repay |
| Cash reserves |
Shows a cushion after closing |
A higher credit score can meaningfully lower your rate, which changes how much house the same payment buys. If your score needs work, see how to improve your credit score and what counts as a good credit score.
The costs people forget
The mortgage is only the headline number. Owning a home adds:
- Property taxes, which vary widely by location and can rise over time.
- Homeowners insurance, and in some areas extra coverage for floods or other risks.
- Maintenance and repairs, often estimated at a meaningful slice of the home value each year. A roof or furnace does not warn you before it fails.
- Utilities and, in some cases, association fees, which can be larger than expected for a bigger home.
Budget for the full picture, not just the loan payment, or you risk becoming house-poor — technically approved but unable to save or breathe.
How to size your budget
- Start from take-home pay, not just the approval letter. The bank max is a ceiling, not a target.
- Apply the 28/36 rule as a sanity check, then trim for your real expenses and goals.
- Add all ownership costs — taxes, insurance, maintenance, utilities — into the monthly figure.
- Keep your emergency fund intact after the down payment and closing costs. See how much emergency fund you need.
- Stress-test the payment. Could you still cover it if your income dipped or rates on a variable loan rose?
What to skip
- Buying at the top of your approval. The most you can borrow and the most you should borrow are rarely the same number.
- Emptying savings for a bigger down payment. A home with no cash cushion behind it is fragile.
- Forgetting closing costs. These one-time fees can be a meaningful percentage of the price and are due up front.
- Assuming you will refinance later. Plan for the loan you actually take, not the one you hope to get.
FAQ
What does the 28/36 rule mean exactly?
Keep housing costs around 28 percent of gross monthly income and total debt around 36 percent. They are guidelines to keep you from overextending.
How big a down payment do I need?
It varies by loan type; a larger down payment lowers your monthly cost and can remove extra mortgage insurance, but draining all your savings to reach one is risky.
Should I buy at the maximum the lender approves?
Usually not. The approval ignores your lifestyle and goals, so comfortable affordability is typically below the cap.
Is it better to rent or buy right now?
It depends on your timeline, local prices, and finances, not a universal answer. Treat this as general information and verify your own situation.
Where to go next
See how much emergency fund you need, learn what a good credit score is, and improve your credit score.