Definition
Protected Characteristics types of Discrimination: A Comprehensive Guide
Understanding the Importance of the Protected Characteristics
The Equality Act 2010 consolidated previously separate strands of anti-discrimination legislation into a single framework built around nine protected characteristics: age, disability, gender reassignment, marriage and civil partnership, pregnancy and maternity, race, religion or belief, sex, and sexual orientation. Discrimination is unlawful where it relates to one of these characteristics, which means that unfair treatment, however genuinely unpleasant, does not fall within the Act unless that connection exists. A personality clash, a manager who treats everyone poorly, or an unpopular management decision may raise issues under other areas of employment law, but they are not discrimination in the statutory sense. For HR professionals, understanding the framework matters for two reasons: it determines whether a complaint engages the Act at all, and it determines which of several distinct legal tests applies, since the analysis and the available defences vary considerably depending on both the characteristic and the form of conduct involved.
A Practical Guide to the Framework
The Act protects employees, workers, job applicants, apprentices, and in many arrangements contractors, and it applies across the whole employment relationship: recruitment and selection, pay and benefits, terms and conditions, training and development, promotion, working conditions, performance management, redundancy, dismissal, and references.
Protection also extends beyond people who actually hold a characteristic. Discrimination by perception covers treatment based on a belief that someone has a characteristic, whether or not that belief is correct. Discrimination by association covers treatment based on a person’s connection to someone else who has a characteristic, such as an employee treated less favourably because they care for a disabled relative. These routes apply to most characteristics but not uniformly, and marriage and civil partnership and pregnancy and maternity operate under narrower rules in this respect.
The Forms of Prohibited Conduct
Four forms of conduct apply across most of the framework, with two further forms specific to individual characteristics.
Direct discrimination is less favourable treatment because of a protected characteristic, assessed by comparison with how someone without that characteristic was or would have been treated. It generally cannot be justified, with one significant exception: direct age discrimination can be defended where the employer shows it to be a proportionate means of achieving a legitimate aim. Beyond that, the only permitted departures are the narrow occupational requirement exceptions set out in the Act.
Indirect discrimination arises where a provision, criterion, or practice is applied generally but puts people sharing a characteristic at a particular disadvantage, and the employer cannot show it to be a proportionate means of achieving a legitimate aim. It is the form most often engaged in practice, precisely because the rules involved are usually applied in good faith and their unequal effect is not obvious until someone examines it. Indirect discrimination applies to all the characteristics except pregnancy and maternity.
Harassment is unwanted conduct related to a protected characteristic that has the purpose or effect of violating a person’s dignity or creating an intimidating, hostile, degrading, humiliating, or offensive environment. Intent is not the test; the assessment considers the effect on the recipient, their perception, and whether it was reasonable for the conduct to have that effect. Harassment applies to all characteristics except marriage and civil partnership and pregnancy and maternity, though conduct in those areas may still be actionable as direct discrimination or under other legal routes.
Victimisation is detrimental treatment because a person has done a protected act, such as raising a complaint of discrimination, supporting someone else’s complaint, or giving evidence. It applies universally and does not depend on the original complaint being upheld.
Two additional forms apply only to specific characteristics. Discrimination arising from disability covers unfavourable treatment because of something arising in consequence of a disability, such as disability-related absence, and can be justified where proportionate. The duty to make reasonable adjustments requires employers to take reasonable steps to remove substantial disadvantages faced by disabled employees, and is the only positive duty of its kind in the framework. Pregnancy and maternity operate under their own provision, under which unfavourable treatment during the protected period requires no comparator at all.
The Nine Characteristics in Outline
Age covers people of all ages and both younger and older workers. It is the only characteristic where direct discrimination can potentially be justified, and the areas that generate most risk are recruitment language, redundancy selection criteria, and retirement, where there is no longer a default retirement age and compulsory retirement requires objective justification.
Disability has the widest set of obligations, including the reasonable adjustments duty and discrimination arising from disability. The statutory definition is broader than commonly assumed, covering mental health conditions, fluctuating and recurring conditions, and neurodivergent impairments where the test is met, with certain conditions deemed disabilities from diagnosis. Most failures in this area arise from inaction rather than decision, particularly around absence management and capability processes.
Gender reassignment protects those proposing to undergo, undergoing, or having undergone a process of reassigning their sex. Neither medical treatment nor a Gender Recognition Certificate is required for protection. The legal position on single-sex spaces developed following the Supreme Court’s judgment in 2025, and employers should work from current regulatory guidance when reviewing policies in this area.
Marriage and civil partnership are the narrowest characteristic. It protects those who are married or in a civil partnership but does not extend to single, divorced, separated, or engaged people, and harassment does not apply. Risk is concentrated in legacy policy wording around benefits, leave, and pensions.
Pregnancy and maternity operate distinctly, requiring no comparator during the protected period. Alongside the Equality Act protections sit obligations under health and safety and employment rights legislation, including risk assessment duties and, since April 2024, substantially extended redundancy protection running to eighteen months after birth.
Race covers colour, nationality, and ethnic or national origins. The persistent risk areas are recruitment, progression through informal networks, and workplace culture, and the evidence in claims typically comes from patterns and inconsistencies rather than explicit statements.
Religion or belief covers religion, religious belief, philosophical belief, and the absence of any of these. The central analytical distinction is between holding a belief, which is absolutely protected, and manifesting it, which may be restricted where proportionate. Dress codes, prayer and observance, leave for religious festivals, and social events are the recurring practical issues.
Sex carries the broadest set of obligations after disability, including the separate equal pay regime, gender pay gap reporting for employers with two hundred and fifty or more employees, and the preventative duty on sexual harassment introduced in October 2024, which requires employers to take proactive steps rather than simply respond to complaints.
Sexual orientation covers orientation towards the same sex, the opposite sex, or either sex, and protects heterosexual employees on the same terms as others. Most complaints in this area concern harassment and culture rather than formal decisions, and information about an employee’s sexual orientation constitutes special category data under UK GDPR.
Vicarious Liability and the Reasonable Steps Defence
Employers are liable for acts of discrimination and harassment committed by their employees in the course of employment, whether or not the employer knew about or approved the conduct. The course of employment is interpreted broadly and extends to work-related social events, work travel, and work-related messaging platforms.
The statutory defence is that the employer took all reasonable steps to prevent the conduct. The standard is demanding, and a policy that exists without being communicated, training delivered once at induction, or a reporting route employees do not trust will not usually satisfy it. What supports the defence is a combination of communicated policies, substantive and refreshed training, accessible reporting routes, prompt and impartial investigation, proportionate outcomes applied consistently, and attention to where concerns recur.
Since October 2024, employers have also been under a positive duty to take reasonable steps to prevent sexual harassment of their employees. This is anticipatory rather than reactive, is generally understood to require a documented risk assessment, and carries a compensation uplift of up to twenty-five per cent where breached, alongside independent regulatory enforcement powers.
Handling Complaints
A complaint that may involve discrimination should be investigated promptly and impartially by someone independent of the conduct or decision in question, with a written outcome and clear reasoning. Where allegations are serious, interim measures such as adjusting reporting lines may be appropriate, applied in a way that does not disadvantage the complainant.
Two points recur across every characteristic. First, the classification of the complaint matters, because the legal test, the evidence required, and the defences available all differ depending on whether the conduct amounts to direct discrimination, indirect discrimination, harassment, or victimisation. Misclassifying at the outset frequently means the investigation addresses the wrong question. Second, victimisation risk is at its highest immediately after a complaint is raised, and any subsequent adverse treatment of the complainant will be assessed against the timing of the complaint regardless of whether the original allegation is upheld.
Claims and Exposure
Employees bringing a tribunal claim must first notify ACAS for early conciliation. The limitation period for discrimination claims is normally three months less one day from the act complained of, or from the last act in a continuing series, with the clock paused during conciliation. Equal pay claims operate to a different timetable, generally requiring a claim within six months of the end of the relevant employment, with arrears recoverable for up to six years in England and Wales.
Remedies include compensation for financial loss covering earnings, benefits and pension, compensation for injury to feelings assessed against established bands, interest, aggravated damages in some circumstances, and recommendations. Two features distinguish discrimination claims from ordinary unfair dismissal claims and are worth understanding when assessing exposure: no qualifying period of service is required, so liability can arise from the treatment of a candidate or a new joiner, and compensation is not subject to the statutory cap.
Building a Consistent Approach
Across all nine characteristics, the measures that reduce risk are substantially the same. Recruitment and selection processes built on defined, job-relevant criteria applied consistently and documented afterwards. Policies reviewed periodically for provisions whose operational justification no longer holds, since indirect discrimination usually originates in rules nobody has examined. Managers equipped to recognise when an issue may engage the Act and to escalate rather than improvise. Records that show what was considered and why, created at the time rather than reconstructed later. Complaints handled promptly and consistently, because the organisation’s response is frequently more determinative of the outcome than the original incident.
None of this requires specialist legal knowledge at the point of first contact. It requires that the person who first encounters a situation recognises that something has changed and knows what to do next, because in most cases that go wrong, that is where the failure occurred.
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