Short answer
A workplace rule is directly discriminatory when it treats someone less favourably because of a protected characteristic. An express maximum age is the clearest example. Direct differences are difficult to justify and require a specific statutory exception, such as a genuine and determining occupational requirement.
A rule is indirectly discriminatory when it appears neutral but puts people sharing a protected characteristic at a particular disadvantage. A ban on all visible belief signs, one language requirement or a uniform physical test may fit that pattern. It can be lawful only if it pursues a legitimate aim and the means are appropriate and necessary. The employer needs evidence, consistent application and consideration of less restrictive alternatives.
The relevant EU framework depends on the ground. Directive 2000/78/EC covers religion or belief, disability, age and sexual orientation in employment. Directive 2000/43/EC covers racial or ethnic origin, while Directive 2006/54/EC covers sex. Language may operate as a proxy for ethnicity or nationality and can separately restrict free movement. National implementing law supplies procedure and remedies.
Start with the protected ground and the wording
The same business rule can engage several legal routes. A headwear rule may affect religion and sex; a language rule may particularly disadvantage non-nationals or an ethnic group; a fitness standard may affect sex, age or disability. Each ground needs separate classification and evidence.
Under Article 2 of Directive 2000/78, direct discrimination occurs where one person is treated less favourably than another in a comparable situation because of a protected ground. Indirect discrimination begins with a neutral provision, criterion or practice that places protected persons at a particular disadvantage.
indirect discrimination shall be taken to occur where an apparently neutral provision, criterion or practice would put persons having a particular religion or belief, a particular disability, a particular age, or a particular sexual orientation at a particular disadvantage compared with other persons unless:
(i) that provision, criterion or practice is objectively justified by a legitimate aim and the means of achieving that aim are appropriate and necessary —
That distinction controls the route to justification. An employer cannot ordinarily defend direct discrimination merely by pointing to a sensible business aim. It must fit a defined exception. Indirect discrimination carries its own objective-justification test, but the employer must prove more than convenience or preference.
Dress codes: equal wording is not equal impact
In C-344/20, S.C.R.L., the Court confirmed that a private rule prohibiting every manifestation of religious or philosophical belief through words, clothing or other means is not direct discrimination if applied generally and without distinction. “Religion or belief” is one protected ground. Joined Cases C-804/18 and C-341/19, WABE, confirm that the same rule may still create indirect discrimination through its effects. Selective wording or inconsistent application can change the direct-discrimination analysis.
For indirect discrimination, abstract neutrality is insufficient. The employer must demonstrate a genuine need, show consistent and systematic pursuit of the policy, and limit the restriction to what is strictly necessary:
“the mere desire of an employer to pursue a policy of neutrality – while in itself a legitimate aim – is not sufficient, as such, to justify objectively a difference of treatment indirectly based on religion or belief”. —
A customer's objection to a worker's religion is not itself a genuine occupational requirement. Evidence of actual adverse consequences, relevant public contact, the policy's breadth, alternatives and effects on freedom of religion all matter. For public employment, C-148/22, Commune d’Ans, held that an entirely neutral municipal environment may justify a general ban only where it is appropriate, necessary and proportionate in its context. National law may provide stronger protection.
Language requirements need a job-linked, proportionate reason
A language requirement may be legitimate where communication is genuinely part of the role: patient safety, teaching, public service, supervision or accurate customer advice. The required language and proficiency level must match the actual task. “Native speaker” is much harder to defend than an objectively tested level of occupational competence.
Language is not itself one of Directive 2000/78's listed grounds. But it may evidence indirect racial or ethnic-origin discrimination under Directive 2000/43, sex discrimination in context, or discrimination based on nationality and an obstacle to worker free movement.
Case C-379/87, Groener, concerned Irish-language knowledge for a permanent lecturer in public vocational education. The Court accepted promotion of a national and first official language as a possible policy, but imposed firm limits:
the requirements deriving from measures intended to implement such a policy must not in any circumstances be disproportionate in relation to the aim pursued and the manner in which they are applied must not bring about discrimination against nationals of other Member States. —
The Court upheld the requirement only on the stated conditions of proportionality and non-discrimination. Employers should document which duties require the language, the level needed, why translation or training is inadequate, and whether equivalent qualifications are accepted. A broad language rule applied to roles with no relevant communication need is vulnerable.
Age limits are direct discrimination—but can rarely be justified
An advertisement saying applicants must be under 30 treats candidates directly by age. Directive 2000/78 contains two possible routes. Article 4(1) permits a characteristic related to age where it is a genuine and determining occupational requirement, the objective is legitimate and the requirement proportionate. Article 6 permits age differences objectively and reasonably justified by legitimate employment-policy, labour-market or vocational-training aims through appropriate and necessary means.
These are strict tests, not permission to rely on assumptions about energy or adaptability. Two judgments involving the same age limit show why evidence and job content control.
In Case C-229/08, Wolf, the Court accepted a maximum recruitment age of 30 for intermediate-career professional firefighters. Scientific material showed that core firefighting and rescue tasks regularly required exceptionally high physical capacity, which declined with age. Training time, years available for front-line duties and the service's age structure supported the measure.
In Case C-416/13, Vital Pérez, the Court rejected age 30 for local police. The duties did not all require the same exceptional capacities. Other regions used higher or no limits, the national police limit had been abolished, and eliminatory physical tests could assess individual fitness less restrictively.
“in fixing such an age limit, Law 2/2007 imposed a disproportionate requirement.” —
The Court reached the same conditional conclusion in C-304/21 for a maximum age of 30 for police commissioners: it was precluded where the actual duties did not require special physical capacities or the limit was disproportionate. Employers should test capacity directly where a reliable individual assessment can achieve the aim.
Fitness standards must measure the essential job
A physical or medical standard may be facially neutral yet disadvantage women, older workers or disabled people. It may also embed direct treatment if thresholds differ expressly by sex or age. The employer must identify the essential tasks and validate that the test measures the capacity actually needed at the required level.
Generic “fitness”, appearance, height or weight standards are weak without task analysis. In C-409/16, Kalliri, a uniform 1.70-metre minimum height for police-school candidates disadvantaged far more women and was not shown necessary: specific aptitude tests were a less restrictive alternative. Reasonable accommodation for disability must be considered under Article 5 of Directive 2000/78 unless it imposes a disproportionate burden.
The genuine-occupational-requirement exception concerns a characteristic related to the protected ground, not the protected ground as such. Its objective must be legitimate and the requirement proportionate. It is interpreted narrowly.
How to test a proposed rule
- Identify every protected group the rule may affect, including overlapping grounds.
- Ask whether the wording or application expressly treats people by a protected characteristic.
- For a neutral rule, examine workforce, applicant and sector evidence for particular disadvantage.
- Define the operational aim precisely and link each requirement to essential tasks.
- Record objective evidence supporting the threshold, language level, clothing restriction or physical standard.
- Compare less restrictive alternatives: individual tests, protective equipment, limited role coverage, training, scheduling or accommodation.
- Apply the rule consistently and review whether circumstances or evidence have changed.
- Preserve the decision record: once facts support a presumption of discrimination, EU directives require the respondent to prove no breach, subject to national procedure.
Conclusion
Express age or protected-ground rules are direct discrimination and survive only narrow statutory exceptions. Neutral dress, language and fitness rules may be indirect discrimination when their real impact falls particularly on a protected group. Their lawfulness then depends on a demonstrated legitimate aim and evidence that the rule is suitable, necessary and no broader than required.
Labels such as “neutrality”, “fluency” or “fitness” do not complete that analysis. EU courts compare the actual job, the evidence, the affected right and realistic alternatives. National implementing law and the specific protected ground determine the final procedure and remedy.
Sources
This article provides general legal information, not advice for a specific matter. Laws, facts and procedural deadlines may change the result. Follow the linked primary sources and obtain local advice before acting.