Reasonable Factors Other Than Age (RFOA) Defense Under ADEA

The reasonable factors other than age defense, or RFOA, is what an employer relies on under the Age Discrimination in Employment Act when a workplace policy is neutral on its face but ends up falling harder on workers 40 and older. The employer’s argument is that the policy rests on some legitimate, non-age reason, and that the reason is a reasonable one. If the employer can show that, the disparate impact on older workers does not violate the ADEA.¹ The defense has a specific shape, a specific scope, and a burden that sits squarely on the employer.

When the Defense Is Available

RFOA is a disparate impact defense. It is not available against a claim of disparate treatment.¹ That distinction controls whether the defense is even on the table.

Disparate treatment is intentional. An employer fires a 58-year-old, replaces her with someone in her thirties, and talks about wanting fresh energy. That is a targeting claim, and RFOA has nothing to say about it. The employer needs a different defense entirely, usually documented performance or conduct reasons for the decision.

Disparate impact is the subtler pattern. A company adopts a policy that reads as neutral — a new physical fitness test, a scoring system for a reduction in force, a certification requirement — and the numbers come back lopsided against older workers. Nobody said anything about age. The results still show it. RFOA exists for that situation. The employer can concede the disparate outcome and argue the policy was chosen and applied for a real business reason unrelated to age.

The employee raising a disparate impact claim has to point to the specific practice producing the disparity. A general accusation that the company treats older workers badly is not enough. The employee identifies the policy; the employer then defends it.

What “Reasonable” Actually Requires

Reasonableness is a two-part test under 29 C.F.R. § 1625.7. The employment practice has to be reasonably designed to achieve a legitimate business purpose, and it has to be administered in a way that actually achieves that purpose in light of what the employer knew or should have known.¹ Both halves matter. A well-designed policy applied carelessly can fail; a carefully applied policy with no real business rationale can fail too.

Showing the factor was not age is only the starting point. A requirement for recent software certifications is not “age” as such, but if the employer cannot explain why that certification bears on the actual work, the defense stalls. Courts look for a genuine link between the criterion and the business goal. If a company cuts payroll by targeting its highest-paid employees, the employer needs to say why salary was the metric it picked and how that choice actually solved the problem it was aimed at.

Good intentions do not carry the defense on their own. If the data during rollout showed older workers being screened out at twice the rate of younger ones and no one paused to look at why, that silence weighs against reasonableness.

The Five EEOC Considerations

The EEOC regulation at 29 C.F.R. § 1625.7(e)(2) lists five considerations for evaluating whether a practice qualifies as RFOA. No single one decides the question, and no single one has to be present or absent for the defense to succeed or fail.¹ Together they describe what a court is likely to be looking at:

How closely the factor relates to the employer’s stated business purpose. A fitness test for firefighters connects clearly to the job. A fitness test for accountants does not.
Whether the factor was defined accurately and applied fairly and accurately, including whether managers received guidance on how to evaluate employees under it.
The extent to which the employer limited supervisors’ subjective discretion, particularly where the criteria are the kind that invite age-based stereotypes. Telling managers to rate each worker’s “long-term potential” with no further definition is the sort of open field the defense struggles to justify.
Whether the employer assessed the adverse impact of the practice on older workers, either before rolling it out or after early results came in.
The severity of the harm to older workers and the steps, if any, the employer took to reduce it, including whether other approaches were available that would have achieved the same goal with less impact.¹

The last point needs a note. RFOA does not require the employer to pick the least discriminatory alternative available. But the existence of less harmful options that the employer knew about and did not use is evidence that the choice it made was not reasonable.² An employer that offered voluntary buyouts before moving to involuntary layoffs is on stronger ground than one that went straight to the cuts.

Salary, Seniority, and Other Factors That Track With Age

The hard RFOA cases involve criteria that are not age but line up closely with it. Salary is the standard example. Older workers usually earn more because they have had longer careers, more promotions, and more raises. Targeting high earners in a layoff can produce almost the same outcome as targeting older workers directly.

The EEOC treats salary as an objectively measurable, non-age factor, so using it is not automatically disqualifying. But because salary correlates strongly with age, using it as the sole cut criterion can generate exactly the disparate impact the ADEA reaches. The agency’s own example: an employer looking to reduce costs by cutting its highest-paid salespeople can lower the risk by also weighing the revenue those employees bring in, so that the reduction picks off genuinely underperforming high earners instead of sweeping in every senior employee.²

Seniority works the same way. The Supreme Court has treated years of service as legally distinct from age even though the two correlate. Seniority-based decisions can qualify as RFOA when they serve a legitimate purpose. In Smith v. City of Jackson, the Court accepted a city’s decision to give larger raises to lower-paid police officers, a choice that disadvantaged longer-tenured, older officers, because it reasonably served the goal of matching pay at competing departments.³

Who Has to Prove What

For years the courts split on this. The Supreme Court resolved it in Meacham v. Knolls Atomic Power Laboratory (2008). Knolls, ordered by the federal government to reduce its workforce, had managers score employees on performance, flexibility, and critical skills. Of the 31 salaried employees laid off, 30 were at least 40 years old.⁴

The Court held that RFOA is an affirmative defense. The employer carries both the burden of producing evidence and the burden of persuading the court that the defense applies.⁵ That is different from the more familiar pattern where the employee has to prove the employer’s stated reason is a pretext. Under RFOA, the employer has to convince the court its reason was reasonable. Evidence that is evenly balanced goes to the employee.

The Court’s reasoning came from the structure of the statute. The RFOA provision sits in the same section as the bona fide occupational qualification defense, and both operate as carve-outs from the ADEA’s general prohibitions. Under a longstanding rule, the party claiming an exemption has to prove it.⁴ For employers, this places a premium on real documentation: the business goal, the criteria chosen, how they were applied, what alternatives were considered, and what the data showed.

How RFOA Compares to Title VII’s Business Necessity Standard

Readers familiar with Title VII sometimes assume the ADEA defense works the same way. It does not. The Supreme Court addressed this in Smith v. City of Jackson, confirming that disparate impact claims are available under the ADEA but that the employer’s defense is less demanding than what Title VII requires.³

Under Title VII, an employer facing a disparate impact claim based on race or sex must prove business necessity, which in practice includes showing that no alternative practice could achieve the same goal with less discriminatory effect. The RFOA standard has no such requirement. The Court stated that the reasonableness inquiry does not ask whether other ways to reach the employer’s goals could avoid the disparate impact.³ The scope of disparate impact liability under the ADEA is narrower for that reason.

In practice, an employer defending an age-based disparate impact claim has a somewhat easier path than one defending a race-based claim on the same facts. The employer does not have to prove it chose the least harmful option. It has to prove the option it chose was reasonable. Reasonable is still a substantive standard, and the five EEOC considerations are how courts fill it in.

What This Means in Practice

For an employer designing a policy that could affect older workers disproportionately — a reduction in force, a new performance metric, a certification requirement, a scoring rubric — the RFOA framework points to specific work that has to happen before the policy is implemented, not after a charge is filed. The business purpose has to be articulable. The criterion has to connect to that purpose. The application has to be structured enough that different managers use it the same way. Someone has to look at the impact data. When less harmful alternatives are visible, the record has to show they were at least considered.

For an employee evaluating whether a claim is worth pursuing, the same framework describes what a court will end up examining. What was the stated business reason? Does it hold up on inspection? Was the policy applied consistently, or did supervisors have wide latitude? Did the employer look at the impact on older workers? Were there obvious less harmful choices that were ignored? The strength of a disparate impact claim under the ADEA turns on how the employer answers those questions, and under Meacham, it is the employer’s job to answer them.

1
eCFR. 29 CFR 1625.7 – Differentiations Based on Reasonable Factors Other Than Age
2
Federal Register. Definition of Reasonable Factors Other Than Age Under the Age Discrimination in Employment Act
3
Justia Law. Smith v City of Jackson, 544 US 228 (2005)
4
Justia Law. Meacham v Knolls Atomic Power Laboratory, 554 US 84 (2008)
5
Legal Information Institute. Meacham v Knolls Atomic Power Laboratory