How Much House Can I Afford? (The 28/36 Rule)
Before you fall in love with a master suite or a three-car garage, you need to know your number. Lenders don't just look at your credit score; they look at your Debt-to-Income (DTI) ratio. To ensure you aren't "house poor"—where all your money goes to your mortgage—banks use a standard guideline known as the 28/36 rule. This guide explains how to use it to find your true home-buying budget in 2026.
What is the 28/36 Rule?
The 28/36 rule is a conservative benchmark used by mortgage lenders to assess a borrower's ability to pay. It consists of two parts:
- The 28% Rule (Front-End DTI): Your total monthly housing costs (PITI + HOA fees) should not exceed 28% of your gross monthly income.
- The 36% Rule (Back-End DTI): Your total debt payments (Housing + car loans + student loans + credit cards) should not exceed 36% of your gross monthly income.
A Real-World Example
Imagine you earn $100,000 per year ($8,333/month). According to the rule:
- Front-End (28%): Your maximum housing payment is $8,333 × 0.28 = $2,333/month.
- Back-End (36%): Your maximum total debt is $8,333 × 0.36 = $3,000/month.
If you have a $400 car payment and $200 in student loans ($600 total), the 36% rule allows for a housing payment of $3,000 – $600 = $2,400. Since $2,333 is the lower number, that is your official "affordability" limit.
Factors that affect your buying power
While income is the main driver, other 2026 market factors will change how much "house" that $2,333 buys you:
- Interest Rates: A 1% increase in rates can reduce your buying power by 10%.
- Property Taxes: Buying in a high-tax state (like NJ or IL) reduces the amount of loan you can afford, as more of that 28% goes to the state instead of the house.
- HOA Fees: Condo or townhome fees are considered part of the "housing cost" and directly reduce your maximum loan amount.
Pro Tips for Home Shoppers
The Role of the Down Payment
Your down payment doesn't change your monthly income, but it drastically changes the price of the house you can buy. A larger down payment reduces the principal loan amount, which lowers your monthly P&I, allowing you to buy a more expensive home while staying under your 28% DTI limit.