Summary answer: Most lenders want your total debt-to-income (DTI) ratio at or below 43%-45% for a conventional loan in the City of Fairfax, though strong compensating factors can push that higher. VA loans can go higher still, using a residual-income approach.

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Front-end vs. back-end DTI

DTI Type What It Measures Typical Max
Front-end Housing payment only ÷ gross income 28%-31%
Back-end All debt ÷ gross income 43%-45% (conventional); higher for VA

Why understanding your exact DTI room matters here

Given the City of Fairfax's genuinely high price floor, every dollar of DTI room affects which property type you can realistically reach.

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