FICO (rhymes with psycho) is an acronym for Fair Isaac Corporation (traded publicly under the symbol FIC) often refers to the best-known credit score in the United States which is calculated using mathematical formulae developed by this company. This score is one of the most important factors in obtaining credit in the United States. For institutions that use scores as a factor in their lending decisions, scores below certain numbers (typically set by each lender's risk management department) may result in denial of credit, or credit being offered at a higher interest rate.
The three major credit reporting agencies in the United States, (Equifax, Experian and Trans Union) calculate their own FICO scores, which go by different trademark names as well as many different versions of the score(often differing because what they are meant to predict and when they were written): For example Beacon, Beacon 96 and the Pinnacle are all available only from Equifax; Empirica Empirica Auto 95 Precision Score and Precision 03 at Trans Union, and Fair Isaac Risk Score at Experian. These versions, while all developed for the agencies by Fair Isaac, differ and are periodically updated to reflect current consumer repayment behavior. The NextGen Scores are the most recent scores, but creditors vary in which version they prefer to use.
The scores use a multiple scorecard design. Each version uses 10 or more individual scorecards, and an individual is typically compared with similar others.(For example, a borrower with two 30-day late payments will be scored against a population with some minor delinquencies.) An individual is then graded according to what variables seem to indicate a repayment risk in that group. This feature may cause a borrower with delinquencies to score in the same range as a borrower without delinquencies.
It is worth mentioning that each of these credit reporting agencies also have developed their own separate proprietary versions of a credit score intended to compete with Fair Isaac's score. Although not as widely used, these scores (for example Trans Union's "TransRisk" score or Experian's "ScoreX" score) are less expensive than the FICO score and, in some situations, may more accurately predict the risk level of a prospective borrower. The cost savings of a non-FICO score are tempting to some banks and credit card companies, who need an accurate risk assessment on millions of accounts every year. Only time will tell if these alternative scores will displace Fair Isaac from its dominant position in the U.S. market for credit scores.
Nearly all large banks also build and use their own proprietary statistical models for credit scoring purposes, often in conjunction with the FICO score or other outside scores.
The statistical models that generate credit scores are subject to federal regulations. The Federal Reserve Board's Regulation B, which implements the Equal Credit Opportunity Act, expressly prohibits a credit scoring model from considering any prohibited basis such as race, color, religion, national origin, sex, or marital status. Regulation B also stipulates that credit scoring models must be empirically derived and statistically sound. Furthermore, if an adverse action is taken as a result of the credit score (e.g. an individual's application for credit is denied) then specific reasons for the denial must be provided to the individual. A statement that the individual "failed to score high enough" is insufficient; the reasons must be specific.
There exist several generally accepted algorithms for extracting the primary contributing factors to a low credit score. One or more of these algorithms is typically used to supply a list of reasons when a loan applicant has been denied credit, in order to satisfy the Regulation B requirement that specific reasons are disclosed. Some consumers feel these adverse action reasons are somewhat disingenuous, as the only determining factor for credit denials is a numeric score -- the "reasons" are summed up only for the consumer.
As mentioned above, each credit bureau also has one or more of its own generic credit scores, available both to consumers on their websites and to lenders. For ease of use, these scores tend to be mathematically scaled so that they fall in the same general range as the FICO score. These scores are used by some businesses to assess creditworthiness (otherwise they would not be offered), however the FICO score remains the dominant score in use today.
Fair Isacc offers scoring models for the U.S., Canada, and South Africa. It also offers a "Global FICO" for many other countries.