What is the 3 3 3 rule for mortgages?

Written by Editorial Team | Last Updated: August 2026

The three-three-three rule for mortgages refers to classic mortgage affordability guidelines or underwriting benchmarks. It helps prospective homebuyers evaluate housing debt-to-income ratios, down payment targets, and long-term interest rate projections to ensure that home loan commitments remain well within safe financial boundaries relative to household earnings.

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Purchasing a $200,000 home on a $40,000 annual salary is possible but will require a disciplined budget and likely a solid down payment.

The three-seven-three rule in mortgage lending refers to federally mandated consumer protection timelines derived from the Truth in Lending Act and the Mortgage Disclosure Improvement Act.

Securing a $500,000 mortgage loan comfortably requires a substantial annual household income, typically falling between $110,000 and $140,000.

A $400,000 house purchase on an $80,000 annual income results in a 5-to-1 price-to-income ratio, which is above the conservative affordability standards recommended by most financial experts.

As analyzed previously, a $300,000 home purchase on a $50,000 annual income is a risky financial move that likely leads to being "house poor.

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Buying a $600,000 home on a $100,000 salary is generally not recommended, as it creates a 6-to-1 price-to-income ratio that is well outside of traditional, sustainable lending benchmarks.

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