Start with the number that actually matters: your monthly payment

Most people start this question backward — they look at home prices in their area and try to work out if they can "afford" that number. It's more useful to flip it around: figure out the monthly payment that fits comfortably into your life first, then work out what price that supports.

Your monthly payment isn't just principal and interest. It typically includes:

• Principal and interest on the loan
• Property taxes
• Homeowners insurance
• Mortgage insurance, if your down payment is under 20%
• HOA dues, if the property has them

Lenders often shorthand this as PITI (principal, interest, taxes, insurance). It's the number that should drive your budget — not the sale price on the listing.

The rule of thumb lenders use

Most lenders lean on two ratios to figure out what a buyer can responsibly borrow:

• Front-end ratio: your monthly housing payment shouldn't exceed roughly 28% of your gross monthly income.
• Back-end ratio: all of your monthly debt payments combined — housing plus car loans, student loans, credit cards — generally shouldn't exceed about 36–43% of gross monthly income, depending on the loan program.

These are guidelines, not hard laws — different loan programs flex these numbers up or down. But they're a solid starting point for a back-of-napkin estimate.

The five things that actually move your number

1. Income

This one's obvious, but lenders look at gross (pre-tax) income, and they want to see it's stable — typically two years of consistent employment or self-employment history.

2. Existing debt

Every recurring monthly debt — student loans, car payments, minimum credit card payments — reduces how much housing payment fits under that back-end ratio. Paying down debt before you shop can meaningfully increase your buying power.

3. Down payment

A larger down payment lowers your loan amount, your monthly payment, and — once you cross the 20% threshold — removes the need for mortgage insurance entirely.

4. Interest rate

Rate moves the monthly payment more than almost anything else. A one-point difference in rate can change what you qualify for by tens of thousands of dollars in home price.

5. Property taxes and insurance

These vary widely by location and can meaningfully change your monthly number even at the same home price — a reason "how much house can I afford" doesn't have one universal answer.

Run the actual numbers

Rules of thumb get you close. For a real number based on your actual income, debt, and target down payment, Yellow's affordability calculator does the math in about a minute.

What comes after you know your number

Knowing a comfortable price range is step one. The next step most buyers take is getting pre-approved, which turns that estimate into something sellers and agents will actually take seriously. Yellow coordinates that step — along with everything from mortgage to moving — so buyers aren't managing it alone. See how pre-approval works.