The 28/36 Rule Explained: A Quick Affordability Gut-Check

The 28/36 rule is a widely referenced guideline for gauging mortgage affordability before formally applying for a loan. It's a rule of thumb, not a regulatory requirement or a guarantee of loan approval — actual lending decisions depend on specific loan program guidelines, which can differ from this simplified rule in either direction.

What the two numbers mean

28% — the front-end ratio. Total monthly housing costs (principal, interest, property taxes, homeowners insurance, and HOA dues if applicable) should generally stay at or below 28% of gross monthly income.

36% — the back-end ratio. Total monthly debt payments, including the housing costs above plus all other debt (credit cards, auto loans, student loans), should generally stay at or below 36% of gross monthly income.

A quick example

On a gross monthly income of $7,000: the 28% guideline suggests keeping total housing costs at or under roughly $1,960 per month, and the 36% guideline suggests keeping total debt payments (including housing) at or under roughly $2,520 per month, leaving about $560 for non-housing debt like a car payment or student loan.

Where the rule falls short

The 28/36 rule doesn't account for cost of living differences between regions, other financial obligations not captured as formal "debt" (like childcare or significant recurring healthcare costs), or personal savings goals. A household in a high cost-of-living area might find 28% unrealistic without cutting into other essentials, while a household with low fixed expenses elsewhere might comfortably exceed it.

It's best treated as a starting sanity check, not a precise target to hit exactly.

Why lenders may approve above 36%

Many loan programs, particularly FHA loans, allow back-end DTI ratios above 36% for well-qualified borrowers, sometimes significantly higher depending on compensating factors like a strong credit score or larger cash reserves. Being approved above the 36% guideline doesn't necessarily mean it's the right amount to take on — approval and comfort are different questions.

Using it as a starting filter, not a final answer

The most practical use of the rule is as a quick early filter when narrowing a home search price range, before getting into detailed pre-approval conversations with a lender — a fast way to avoid house-hunting well outside a realistic range.

Where the guideline comes from

The Consumer Financial Protection Bureau references similar debt-to-income thresholds in its explanation of how lenders evaluate affordability during underwriting.

Check your own ratios quickly

Rather than doing the math by hand, it's faster to plug in real numbers and see where you land. Use MortgageWise.online's free calculator to check your front-end and back-end ratios against a target home price.

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