What is the 80 percent rule for adverse impact?

Asked by: Dr. Pablo Schowalter  |  Last update: March 22, 2026
Score: 4.1/5 (67 votes)

The 80% Rule (or Four-Fifths Rule) is a guideline from the EEOC to detect adverse impact, suggesting that if a protected group's selection rate (hiring, promotion) is less than 80% (four-fifths) of the highest selection rate for any group, adverse impact may exist. It's a screening tool, not definitive proof of discrimination, used to identify potential disparities in employment decisions for groups based on race, sex, or ethnicity, requiring further analysis.

What is the 80 percent rule adverse impact?

The four-fifths or 80% rule is described by the guidelines as “a selection rate for any race, sex, or ethnic group which is less than four-fifths (or 80%) of the rate for the group with the highest rate will generally be regarded by the Federal enforcement agencies as evidence of adverse impact, while a greater than ...

How to calculate adverse impact?

The four-fifths rule is an equation that can help you determine if there is evidence of adverse impact. If an organization finds that the selection rate of a protected group is less than 80% of the selection rate when compared to a different group, it may suggest that there's an adverse impact.

How to prove adverse impact?

How to Test for Adverse Impact

  1. Four-fifths rule (80% rule) This simple, easy-to-use rule of thumb for detecting adverse impact compares the selection rate (the percentage of people hired or promoted) for a protected group to the selection rate for the majority group. ...
  2. Chi-square test. ...
  3. Fisher's exact test.

What is the 80% rule in affirmative action?

The rule states that companies should be hiring protected groups at a rate that is at least 80% of that of white men. For example, if a firm has hired 100 white men in their last hiring cycle but only hired 50 women, then the company can be found in violation of the 80% rule.

10-Minute I/O - Adverse Impact

23 related questions found

What is the 80 percent rule?

The 80-20 rule is a principle that states 80% of all outcomes are derived from 20% of causes. It's used to determine the factors (typically, in a business situation) that are most responsible for success and then focus on them to improve results.

What is the four fifths rule adverse impact?

According to the EEOC, a selection rate for any group that is less than four-fifths (or 80%) of the rate for the group with the highest selection rate may indicate adverse impact. This applies to any organization that is hiring in the United States, even if that organization is based overseas.

What role does HR play in adverse impact?

Making Informed HR Decisions: Calculating adverse impact provides HR professionals and management with valuable data that can guide decision-making. It enables them to adjust their practices, policies, and procedures to promote equity and fairness.

How can adverse impact be proven?

Under the UGESP, adverse impact is most commonly measured using the four-fifths rule. According to this rule, if the selection rate for any race, sex, or ethnic group is less than 80% (or four-fifths) of the rate for the group with the highest selection rate, adverse impact may be present.

How to calculate adverse?

Calculate adverse impact ratios.

This is done by comparing the selection rate for each group against that of the most-represented group, in which you are basically comparing the rate for the adverse group with the rate for the favored group by dividing the former by the latter.

How to calculate percentage impact?

First: work out the difference (increase) between the two numbers you are comparing. Then: divide the increase by the original number and multiply the answer by 100. % increase = Increase ÷ Original Number × 100. If your answer is a negative number, then this is a percentage decrease.

How to calculate 30% hike on CTC?

Let us understand the math by calculating 30% hike in salary.

  1. Step 1: Now 30% hike is 30/100 which is 0.3.
  2. Step 2: Let us imagine the current salary being ₹20,000. So, 20,000*0.3 is ₹6000.
  3. Step 3: Adding the increment of ₹6000 to the current salary makes it ₹26,000. Now this is the new net salary after the hike.

What is the 80 20 rule for discrimination?

For instance, if an employer hires 60% of white male applicants for a particular job position but only 20% of the female applicants, there could be a potential case of discrimination as the hiring rate for women is less than 80% of the hiring rate for white men.

Is it true that 20% of people do 80% of the work?

Yes, the idea that 20% of people do 80% of the work reflects the Pareto Principle (or 80/20 rule), suggesting a minority of inputs (causes/people) drive the majority of outputs (results/work), which is a common observation in business, productivity, and life, though some view it as a myth or oversimplification. While not a precise law, it highlights that effort and results are often uneven, and focusing on the crucial 20% of activities or individuals can yield significant gains. 

What are the longest hours you can legally work?

Legally, in the U.S., there's no federal limit on work hours for adults (16+), but the Fair Labor Standards Act (FLSA) requires overtime pay (1.5x) for over 40 hours a week, while some states and specific industries (like transportation) have stricter rules for rest, shift length, and mandatory days off, so check your state laws and union contracts for precise limits on consecutive hours or required rest. 

Do companies have to hire a certain percentage of minorities?

Affirmative action does not mean hiring unqualified people from minority groups over more qualified workers. Businesses are not required to set quotas based on race or any other factor listed above. Affirmative action encourages hiring qualified minorities to apply for available positions.

What are 5 examples of unfair discrimination?

Five examples of unfair discrimination include being passed over for promotion due to race or gender (racial/gender bias), paying women less for the same job as men (unequal pay), denying reasonable accommodations for a disability (disability discrimination), harassing someone for their sexual orientation (sexual orientation discrimination), or retaliating against an employee for reporting harassment (retaliation). These actions unfairly disadvantage individuals based on protected traits rather than merit, violating laws like Title VII. 

What is one way for a plaintiff to prove a disparate impact?

The plaintiff must show disproportionate impact, typically through statistical evidence, that a specific policy or practice adversely affects a protected group more than others. For example, a hiring test might disproportionately screen out women or minorities.

What is the principle of adverse impact?

A Principal Adverse Impact (PAI) is any impact of investment decisions or advice that results in a negative effect on sustainability factors, such as environmental, social and employee concerns, respect for human rights, anti-corruption, and anti-bribery matters.

What is the 4 5 rule adverse impact?

A selection procedure violates the 4/5ths rule if the selection rate for the subgroup(s) is less than 4/5ths of the selection rate for the focal group. When it is less than 4/5ths, this is considered evidence of adverse impact.

Can HR help with a toxic work environment?

By promoting open communication, providing leadership training, and implementing feedback channels, HR can help address toxic behaviors early. Additionally, HR must hold leadership accountable and encourage employee well-being practices to foster a healthy, positive workplace culture."

What are the 4 C's of HR policies?

What Are the 4 C's of HR Policies? The Four C's—Character, Commitment, Compatibility, and Competence—are like your hiring compass. They guide HR teams to evaluate potential hires in a way that goes beyond just ticking boxes on a resume.

What is the EEOC 80 rule?

In simple terms, the rule states that the selection rate for any demographic group (based on race, sex, or ethnicity) should be at least 80% of the selection rate for the group with the highest rate. If the rate falls below 80%, it may indicate adverse impact and trigger further investigation.

What does adverse mean on a background check?

Adverse Action Notices are Required by Law

Adverse action is any action that is taken based off of information that is derived during a background check that negatively impacts an individual's employment, credit, insurance, etc.

What is a disparate impact in employment law?

Disparate impact occurs when a neutral policy unintentionally harms a protected group more than others. Both can create legal risk, so employers must review actions and policies for intent and outcomes.