Front-End Ratio

Front-end ratio, also called the housing ratio, measures the percentage of gross monthly income that goes specifically toward housing costs, principal, interest, property taxes, and insurance, collectively known as PITI, plus HOA fees where applicable. It deliberately excludes all other debt, car loans, credit cards, student loans, which are instead captured in the broader back-end ratio.

Lenders calculate this separately from total debt-to-income because housing is typically the largest and least flexible monthly obligation a borrower carries. A conventional threshold of 28% is commonly used as a maximum, though specific loan programs and compensating factors like strong credit or large reserves can allow some flexibility above that line.

Front-End Ratio (%) = (Monthly PITI + HOA Fees) / Gross Monthly Income × 100

A borrower has a gross monthly income of $8,000 and a projected monthly PITI of $2,100, with no HOA fees.

• Front-end ratio: ($2,100 / $8,000) × 100 = 26.25%

This falls comfortably under the common 28% threshold, suggesting the housing payment alone is affordable relative to income, before even considering other debt obligations that would factor into the back-end ratio.

• Isolates housing costs specifically, unlike the broader back-end ratio. This lets lenders assess mortgage affordability on its own, separate from a borrower's total debt picture.
• 28% is a common conventional threshold, not a universal rule. Government-backed loan programs and lenders with different risk appetites can apply different front-end caps.
• Excludes utilities, maintenance, and other ongoing housing costs. Only PITI and HOA fees count toward the formal ratio, even though real monthly housing expenses often run higher.
• A low front-end ratio alone doesn't guarantee loan approval. Back-end ratio, credit score, and other factors still matter, front-end is one piece of the overall underwriting picture.
• Compensating factors can offset a higher-than-typical front-end ratio. Strong credit, a large down payment, or significant cash reserves can sometimes support approval even above the standard threshold.