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Fair Lending Implications of Credit Scoring Systems
During the past decade, lenders' use of credit scoring systems has increased significantly, and examiners routinely consider the role of credit scores in lending decisions. The comparative analysis portion of a fair lending examination includes an interview to determine the criteria the lender considered in the decision point (underwriting, pricing, etc.) selected for review.1 This interview frequently reveals that a credit score was one of the criteria. At this point, examiners can determine how to proceed by consulting the Interagency Fair Lending Examination Procedures.2 However, examiners must synthesize information from several sections of the Procedures and the appendixes.
This article gives examiners the tools they will need to navigate this situation. It provides an overview of credit scoring systems, analyzes why the use of credit scores has proliferated, and explains how their use is considered as part of a fair lending examination. It then recommends a concise conceptual framework for proceeding with a fair lending examination when a credit score is one of the criteria considered by the lender.
An Overview of Credit Scoring Systems
A credit scoring system mechanically evaluates creditworthiness on the basis of key attributes of the applicant and aspects of the transaction.3 A system can be as simple as a form the loan officer completes by hand that assigns points to particular attributes, or as complex as an artificial intelligence-based neural network with a continuous feedback loop that adjusts the weighting coefficients and the cutoff score. A credit scoring system can be the only factor considered in making the credit decision, or the lender may combine a credit score with other criteria.4
Two types of credit scores existbureau scores and custom scores. A bureau score considers only the information on an individual's credit report and is generated by a consumer reporting agency. The largest three consumer reporting agencies are Experian, Equifax, and TransUnion. A lender pays the consumer reporting agency an additional fee to obtain the score at the time it obtains a copy of the credit report. An "acceptable" score varies with the lender's appetite for risk; however, an acceptable score usually falls around 600.
A custom score (sometimes referred to as an application score) is generated by the lender from a scoring system either developed by the lender or purchased from a vendor. A custom score usually considers the information on the applicant's credit report, selected information about the applicant, and characteristics of the credit transaction. Examples of commonly considered applicant information are type of residence, length of time at current residence, type of employment, length of time in current employment, and income. Typically, eight to ten variables are considered in a custom scorecard. Many custom scoring systems are scaled so that an acceptable score will be around 200, again depending on the lender's risk appetite. The scaling of custom credit scoring systems varies considerably among vendors and lenders. Some lenders blend an applicant's bureau score and a custom score in making a credit decision.
The Use of Credit Scoring Systems Has Increased Considerably
The accuracy and cost of credit scoring systems have benefited substantially from technological advances in automated data processing and improvements in statistical methodologies. Many lenders have found that credit scoring systems are cutting the time and administrative costs of making credit decisions, as well as improving the consistency of the decisions within their organizations. As a result:
The increased use of credit scoring systems has implications for examiners as they conduct fair lending examinations.
The Role of Credit Scoring Systems in a Fair Lending Examination
A fair lending examination attempts to detect either overt discrimination or disparate treatment on a prohibited basis. Examiners select a focal point based on the risk that discrimination may be occurring, determine the criteria the lender considers in making the credit decision, evaluate the criteria and procedures for overt discrimination, and compare how the criteria are applied to a selected prohibited basis group with how they are applied to an appropriate control group. For example, the treatment of Hispanic applicants may be compared with the treatment of non-Hispanic whites.6
The use of a fairly developed and applied credit scoring system can reduce the possibility of unlawful discrimination by helping to ensure consistency and uniformity and minimizing individual judgment and discretion. However, a credit scoring system is not a panacea, and in certain circumstances, it can even be the source of fair lending violations.
Disparate treatment can occur at three stages in the use of a custom credit scoring system:
How should a fair lending examination be conducted once an examiner learns that a credit score is one of the criteria used in making a credit decision? Initially, the examiner should determine if the credit score is a bureau score or a custom score. If it is a bureau score, the examiner does not need to obtain more information about the scoring system. The comparative analysis should focus on the pattern of overrides and the lender's consideration of other criteria unrelated to the system. It is rare for a bureau score to be the only criterion considered in making a credit decision.
However, if the credit score is a custom score, the examiner should obtain a list of the variables considered by the system and determine if the scoring system is split into multiple cards on the basis of age. If a prohibited basis other than age, or a possible proxy for a prohibited basis other than age, is contained in the variables, the examiner should report this information to his or her manager as soon as possible. Addressing the overt discrimination issue will consume significant resources; therefore, the examiner should also consult with the manager about whether to continue with the planned comparative analysis.
As mentioned previously, age is the only prohibited basis that legally can be considered in a credit scoring system. Age is not a prohibited basis under the Fair Housing Act, and the Equal Credit Opportunity Act and Regulation B provide a narrow exception for the consideration of age if the system meets certain requirements.
It is preferable from a risk management standpoint for a lender to validate every credit scoring system used to underwrite or price loans. However, from a compliance standpoint, a credit scoring system does not have to be validated unless it considers age. A credit scoring system can consider age in one of two ways: (1) the system can be split into different scorecards depending on the age of the applicant or (2) age may be directly scored as a variable. Some systems may consider age in both ways. Regulation B requires that all credit scoring systems that consider age be validated. The regulation uses the term "empirically derived, demonstrably and statistically sound."10 For purposes of this article, we will refer to this term as "valid."
The burden is on the lender to demonstrate that a credit scoring system that considers age is valid for each credit product for which it is being used. An initial validation and periodic revalidations must occur to allow the scoring system to consider age.11 Generally, a lender must validate a credit scoring system based on data from the institution's own through-the-door applicant population. However, if the lender's data are insufficient for an initial validation, the lender is permitted to obtain a validated scoring system or the data from which to develop a validated system from another lender or lenders for use on an interim basis. A lender must validate and revalidate its system based on its own data when they become available.12
The system is treated as considering, but not scoring, age if it is split into only two cards, neither of which contains age as a variable, and one card covers a wide age range that encompasses elderly applicants. (Elderly applicants are applicants 62 years of age or older.)13 Typically, the younger card in an age-split system is used for applicants under a specific age between 25 and 30. The younger scorecard de-emphasizes certain factors, such as the number of accounts on the applicant's credit history, the age of the oldest account on the applicant's credit history, length of employment, and length of time at present residence, but increases the negative weight of any derogatory information on the credit report. Validation is the only requirement Regulation B imposes on a system that considers, but does not score, age.14
Conducting a Fair Lending ExaminationA Conceptual Framework
The FDIC has regional Fair Lending Examination Specialists available to provide technical assistance to FDIC examiners conducting any aspect of a fair lending examination.
Systems that Score Age
A system is treated as scoring age if age is directly scored as a variable, regardless of whether the system is also age-split, or if elderly applicants are included in a card with a narrow age range in an age-split system. Regulation B imposes a second requirement on scoring systems that score age-the age of an elderly applicant must not be assigned a negative factor or value.16
The next steps in the fair lending examination framework flow from these requirements. If a custom scoring system considers age, the examiner should obtain the lender's documentation on the initial validation and all periodic revalidations, including the weighting coefficients. At the FDIC, the documentation is then submitted to the Washington Office through regional management for expert review. The examiner should then complete the comparative analysis considering whether there are indications of disparate treatment in either the development and input of the applicant data, low- and high-side overrides of the system, or both.
In summary, based on an understanding of the different types of credit scoring systems and the Regulation B requirements for scoring systems that consider age, the framework in the shaded box is recommended for conducting a fair lending comparative analysis of credit decisions in which one of the criteria considered is a credit score.
Benefits of Using This Framework
This conceptual framework is recommended as an aid in conducting efficient fair lending examinations that result in correct, legally supportable conclusions. Applying the framework does the following:
R. Russell Bailey
1 FDIC-regulated institutions are subject to two Federal statutes that prohibit discrimination in lending. The Equal Credit Opportunity Act (ECOA) covers all credit transactions. It prohibits discrimination on nine bases-race, color, religion, sex, national origin, age, marital status, receipt of public assistance, and the exercise of a right under the Consumer Credit Protection Act . The regulation that implements ECOA is 12 C.F.R., Part 202 (Regulation B). The Fair Housing Act covers residential real estate-related credit transactions. It prohibits discrimination on seven bases-race, color, religion, sex, national origin, handicap, and familial status. The regulation that implements the Fair Housing Act is 24 C.F.R., Part 100.
4 Official Staff Interpretations at Paragraph 202.6(b)(2), Comment 5.
5 Many lenders segment the applicant population by applicant characteristics, channels through which the application was received, or both. For example, a lender may have one system for applicants with nothing worse than a 30-day late on their credit report and a different system for applicants with more serious derogatory information. Or, a lender may have one system for automobile loan applications received directly from the borrower and a different system for automobile loan applications received indirectly through an auto dealer.
7 United States v. Associates National Bank (D. Del.).
8 The opportunity for overt discrimination or disparate treatment to occur does not exist in the first two stages if the lender uses a bureau score, because (1) the lender does not develop or input the data and (2) we can confirm from publicly available information that bureau scores do not consider any prohibited basis, including age, or any variable that could be considered a proxy for a prohibited basis.
9 United States v. Deposit Guaranty National Bank (N.D. Miss.).
11 A credit scoring system that considers age must be validated and revalidated even if it is only one of several factors considered in the credit decision. Official Staff Interpretations at Paragraph 202.6(b)(2), Comment 5.
12 Official Staff Interpretations at Paragraph 202.2(p), Comment 3.
14 Official Staff Interpretations at Paragraph 202.6(b)(2), Comment 2.
16 A negative factor or value means utilizing a factor, value, or weight that is less favorable than the lender's experience warrants, or is less favorable than the factor, value, or weight assigned to the most favored age group below the age of 62. (12 C.F.R. 202.2(v)).
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