What is FICO Score?

A FICO score is a proprietary credit scoring model developed by the Fair Isaac Corporation (FICO) that evaluates a consumer's credit risk and assigns a three-digit score between 300 and 850. As the primary credit score brand in the United States, FICO scores are utilized in approximately 90% of all consumer lending decisions. The algorithm parses data compiled within a consumer's credit bureau reports and calculates a score based on five key components: payment history (35%), amounts owed or credit utilization (30%), length of credit history (15%), credit mix (10%), and new credit inquiries (10%). Lenders categorize FICO scores into distinct risk tiers (ranging from 'Poor' to 'Exceptional') to determine loan eligibility and price interest rates.

Lenders utilize different versions of the FICO algorithm depending on the industry and asset class. In credit card and auto lending, FICO Score 8 and FICO Score 9 are the most prevalent. For residential mortgages, conforming loans backed by Fannie Mae and Freddie Mac historically mandated legacy versions, specifically Equifax Beacon 5.0 (FICO 5), Experian Fair Isaac Version 2 (FICO 2), and TransUnion FICO Risk Score Classic 04 (FICO 4). However, under Federal Housing Finance Agency (FHFA) modernization directives rolling out through 2026, the mortgage industry is transitioning into a multi-score framework that adopts VantageScore 4.0 and FICO 10T. FICO 10T is particularly notable because it incorporates 'trended data,' analyzing a borrower’s credit balances over a rolling 24-month window rather than relying on a single monthly snapshot.