Everyone has the right to be treated fairly at work. Yet sex discrimination remains one of the most common employment law issues in the UK, affecting recruitment decisions, promotion opportunities, pay, workplace culture and dismissal. The Equality Act 2010 protects workers from discrimination because of their sex and provides legal remedies when unfair treatment occurs.
Sex discrimination at work occurs when someone is treated unfairly because of their sex. It can take many forms, from being denied a job opportunity or promotion to experiencing unequal pay, workplace harassment, or unfair dismissal. Under the Equality Act 2010, sex is a protected characteristic, making it unlawful for employers to discriminate against workers, employees, job applicants and other protected individuals because of their sex.
Addressing sex discrimination is important because it can have a significant impact on career progression, earnings, wellbeing, professional opportunities – and workplace culture. Discriminatory treatment not only affects individual employees but can also damage workplace culture, reduce productivity, and expose employers to costly legal claims. Creating a workplace where employees are treated fairly regardless of their sex is therefore both a legal obligation and a key part of building an inclusive and successful organisation.
The Equality Act 2010 provides extensive protection against sex discrimination in the workplace. The legislation covers all stages of employment, including recruitment, training, pay, promotion, flexible working arrangements, redundancy, and dismissal. It also protects workers from harassment and victimisation linked to sex and gives individuals the right to take legal action where discrimination occurs.
This guide is designed for employees, workers, job applicants, agency staff, contractors and employers who want to understand their rights and responsibilities under UK discrimination law. It explains the different types of sex discrimination, provides practical workplace examples, and outlines the steps individuals can take if they believe they have experienced unlawful treatment at work.
What Is Sex Discrimination?
Sex discrimination occurs when someone is treated unfairly because of their sex. Under the Equality Act 2010, sex is one of nine protected characteristics, meaning employers must not discriminate against individuals because of their sex
It is important to distinguish between unfair treatment and unlawful discrimination. An employer can sometimes behave unfairly, make poor management decisions, or treat employees inconsistently without breaking discrimination law. For treatment to amount to unlawful sex discrimination under the Equality Act 2010, there must be evidence that the individual was treated less favourably, placed at a disadvantage, harassed, or victimised because of their sex. The key question is whether the treatment was linked to the protected characteristic of sex, rather than simply being unfair or unreasonable.
Sex discrimination can occur at every stage of employment, including:
- Job advertisements and recruitment.
- Interviews and selection decisions.
- Terms and conditions of employment.
- Promotion opportunities.
- Training and development.
- Pay and bonuses.
- Discipline and grievance procedures.
- Redundancy exercises.
- Dismissal and references.
Protection extends beyond traditional employees and includes workers, agency staff, contractors undertaking work personally, job applicants and, in some circumstances, former employees.
The Four Types of Sex Discrimination
Direct Sex Discrimination
Direct sex discrimination occurs when an individual is treated less favourably because of their sex. Under the Equality Act 2010, this happens when a person receives worse treatment than another person in comparable circumstances because of the protected characteristic of sex.
Less Favourable Treatment Because of Sex
The key question in a direct discrimination claim is whether the individual would have been treated differently had they been of a different sex. Less favourable treatment can arise in relation to recruitment, pay, promotions, training opportunities, disciplinary action, benefits, redundancy selection, or dismissal. Unlike indirect discrimination, direct sex discrimination generally cannot be justified simply because an employer believes there is a good business reason for the treatment.
Discrimination by Perception
Direct sex discrimination can occur even where assumptions about a person’s sex are incorrect. This is known as discrimination by perception. A claim may arise where an individual is treated less favourably because someone perceives them to be of a particular sex, regardless of whether that perception is accurate. The focus is on the reason for the treatment rather than the individual’s actual sex.
Discrimination by Association
The Equality Act also protects individuals who experience unfavourable treatment because of their association with someone of a particular sex. This is known as discrimination by association and may arise where a decision is influenced by an individual’s relationship, connection, or association with another person. Again, the issue is the reason for the treatment rather than the individual’s own protected characteristic.
Workplace Examples
Examples of direct sex discrimination include:
- Refusing to recruit a qualified candidate because of their sex.
- Rejecting an application based on assumptions about the type of work suitable for a particular sex.
- Denying promotion opportunities because of stereotypes regarding leadership ability.
- Excluding an employee from training or development opportunities because of their sex.
- Applying disciplinary procedures more harshly to employees of one sex than another.
- Refusing flexible working arrangements based on sex-based assumptions about caring responsibilities.
- Selecting an employee for redundancy because of views linked to their sex.
- Dismissing an employee because of their sex.
Occupational Requirement Exception
In limited circumstances, different treatment may be lawful where being of a particular sex is a genuine occupational requirement and the requirement is a proportionate means of achieving a legitimate aim. However, these exceptions are interpreted narrowly and employers must be able to justify their decision with clear evidence.
Indirect Sex Discrimination
Indirect sex discrimination occurs where an employer applies a Provision, Criterion or Practice (PCP) that applies to everyone in the same way but places people of a particular sex at a particular disadvantage compared to those of another sex. A PCP can include workplace policies, eligibility requirements, recruitment criteria, workplace rules, contractual terms, or working arrangements.
Unlike direct sex discrimination, indirect discrimination is not usually intentional. The policy or practice may appear neutral on its face and apply equally to all employees. However, if it disproportionately disadvantages people of one sex and cannot be legally justified, it may amount to unlawful discrimination under the Equality Act 2010.
To establish a claim, an individual must show that the PCP places people of their sex at a particular disadvantage and that they personally experienced that disadvantage. The focus is not on whether the employer intended to discriminate, but on the effect of the policy in practice.
An employer may avoid liability if it can demonstrate that the PCP is objectively justified. This means showing that the policy is a proportionate means of achieving a legitimate business aim. The employer must provide evidence to support the requirement and show that there was no less discriminatory way of achieving the same objective.
A legitimate business aim may include matters such as maintaining adequate staffing levels, ensuring health and safety, meeting operational requirements, delivering customer services effectively, or achieving a genuine business need. However, cost alone will rarely be sufficient justification for a discriminatory practice.
Common Workplace Examples
Indirect sex discrimination may arise in situations such as:
- Requiring all employees to work full-time, where this disproportionately disadvantages people of a particular sex who are more likely to have caring responsibilities.
- Refusing flexible working arrangements without a clear business justification, particularly where this places people of one sex at a disadvantage.
- Introducing shift patterns that make it difficult for employees with caring responsibilities to continue working their usual hours.
- Requiring employees to work late evenings or weekends without considering the impact on those with childcare commitments.
- Applying rigid attendance requirements that do not allow for flexible start and finish times.
- Requiring regular travel or overnight stays where this disproportionately disadvantages employees with primary caring responsibilities.
- Setting recruitment or promotion criteria that appear neutral but are harder for people of a particular sex to satisfy.
- Requiring attendance at networking events or meetings outside normal working hours, which may disadvantage employees with caring responsibilities.
Harassment
Harassment related to sex is unwanted conduct connected to a person’s sex that has the purpose or effect of:
- Violating their dignity;
or
- Creating an intimidating, hostile, degrading, humiliating or offensive environment.
Sexual harassment involves unwanted conduct of a sexual nature – and the conduct has the purpose of effect as above. Sexual harassment can be a one-off incident or a pattern of behaviour. It can occur in the workplace, during work-related social events, whilst working remotely, or through electronic communications such as emails, messaging platforms or social media.
The Equality Act 2010 also provides protection where an individual is treated less favourably because they have either rejected or submitted to unwanted conduct of a sexual nature. This means an employer or colleague must not retaliate against a person because they refused sexual advances, objected to inappropriate behaviour, or participated in conduct they did not welcome. Importantly, the person who perpetrated the sexual harassment does not need to be the same person who treated the worker less favourabley.
Whether an environment is hostile, degrading or offensive will depend on all the circumstances of the case, including how the conduct affected the individual, the wider context, and whether it was reasonable for the conduct to have that effect.
Examples of behaviour that may amount to harassment include:
- Sexist jokes.
- Offensive comments relating to a person’s sex.
- Repeated remarks about a person’s appearance.
- Sharing inappropriate images, videos or content.
- Unwanted touching or physical contact.
- Sexual comments, innuendo or propositions.
- Excluding colleagues from opportunities or workplace activities because of their sex.
- Making stereotypical assumptions about the abilities or roles of people based on sex.
- Importantly, an individual does not have to show that the behaviour was intended to cause offence. Conduct may still amount to harassment if it has the effect of creating an intimidating, hostile, degrading, humiliating or offensive working environment.
Employers can be held legally responsible for acts of harassment carried out by their employees during the course of employment. To reduce the risk of liability, employers should implement effective equality and anti-harassment policies, provide regular staff training, investigate complaints promptly, and take reasonable steps to prevent discriminatory behaviour in the workplace.
Victimisation
Victimisation occurs when an individual suffers a detriment because they carried out a protected act under discrimination law. A protected act includes making a complaint of discrimination, raising concerns about discriminatory treatment, bringing an Employment Tribunal claim, giving evidence in support of another person’s complaint, or alleging that discrimination has taken place. Protection applies regardless of whether the individual is complaining about discrimination directed at them personally or supporting someone else’s rights.
The purpose of victimisation protection is to ensure that individuals can challenge discrimination without fear of retaliation. An employer must not treat someone unfavourably because they have raised concerns about sex discrimination, sexual harassment, or any other form of unlawful discrimination. Retaliation can take many forms, including being overlooked for promotion, excluded from workplace opportunities, subjected to disciplinary action, given less favourable duties, receiving negative performance assessments, or being treated differently by managers or colleagues after making a complaint.
Protection against victimisation also extends to employees who support another person’s discrimination complaint. For example, an employee may be protected if they provide a witness statement, attend a grievance meeting on behalf of a colleague, or otherwise assist in an investigation into alleged discrimination. The law recognises that employees should be able to support others in enforcing their workplace rights without suffering negative consequences themselves.
Importantly, a victimisation claim focuses on the treatment that follows the protected act rather than whether the original discrimination complaint ultimately succeeds. If an individual experiences a detriment because they raised concerns, participated in proceedings, or supported another employee, they may have a separate claim for victimisation under the Equality Act 2010.
Workplace examples include:
- Being denied promotion after making a complaint.
- Receiving worse shifts after supporting a colleague’s case.
- Being excluded from meetings after reporting discriminatory conduct.
- Facing disciplinary action because of a discrimination grievance.
Common Examples of Sex Discrimination at Work
Sex discrimination can appear in many forms across the workplace.
Recruitment and Interviews:
- Gender-specific job advertisements.
- Asking female candidates about family plans.
- Rejecting applicants based on stereotypical assumptions.
Promotions:
- Overlooking women for senior leadership opportunities.
- Assuming men are more committed to career progression.
Pay and Bonuses:
- Different bonus structures for men and women performing comparable roles.
- Unequal access to commission opportunities.
Training:
- Excluding employees from development programmes because of assumptions about future family commitments.
Flexible Working:
- Refusing flexible working requests based on outdated gender stereotypes.
Redundancy:
- Using selection criteria that disproportionately disadvantage one sex.
- Failing to follow fair redundancy procedures.
Performance Management
- Holding employees to different standards because of their sex.
Dress Codes:
- Applying stricter appearance standards to one sex without justification.
References
- Providing negative references linked to discriminatory attitudes.
Social Events:
- Excluding employees from networking opportunities or client events.
Dismissal:
- Dismissing an employee because they are pregnant.
- Removing someone from employment due to sex-based assumptions.
Pregnancy and Maternity Discrimination
The Equality Act 2010 provides specific protection against pregnancy and maternity discrimination in the workplace. Protection begins as soon as an individual becomes pregnant and continues throughout pregnancy, maternity leave, and the relevant protected period following childbirth. During this time, an employer must not treat someone unfavourably because of their pregnancy, a pregnancy-related illness, or because they are exercising their right to maternity leave.
Pregnancy and maternity discrimination can occur in many ways, including refusing promotion opportunities, reducing responsibilities, excluding an employee from training or career development opportunities, or subjecting them to negative treatment because of pregnancy-related sickness absence. Employees on maternity leave retain important employment rights and should not be disadvantaged because they choose to take leave. They are generally entitled to return to their role or, in certain circumstances, a suitable alternative role on terms that are no less favourable.
Employers should also provide appropriate support for employees who are breastfeeding on their return to work, including considering suitable facilities and practical arrangements where required. In addition, employers have a duty to assess workplace risks that may affect pregnant employees or new mothers and to take reasonable steps to remove or reduce any identified risks.
Special protections also apply in redundancy situations involving employees who are pregnant, on maternity leave, or within certain protected periods after returning to work. Employers must ensure that any redundancy process is fair, non-discriminatory, and compliant with the additional legal safeguards that apply. Pregnancy and maternity discrimination is a separate form of protection under the Equality Act 2010, although the circumstances may also give rise to related claims for sex discrimination.
Gender Reassignment
Gender reassignment is a separate protected characteristic under the Equality Act 2010. The Act protects individuals who are proposing to undergo, are undergoing, or have undergone a process of gender reassignment. Importantly, legal protection is not dependent on a person having undergone medical treatment, surgery, or obtaining a Gender Recognition Certificate. Employees, workers and job applicants must not be treated unfavourably because they are transgender or because they are transitioning.
Although sex discrimination and gender reassignment discrimination are distinct legal concepts, there can sometimes be overlap between the two. Sex discrimination concerns less favourable treatment because of the protected characteristic of sex, whereas gender reassignment discrimination relates to a person’s transgender status or their process of transitioning. Depending on the circumstances, an individual may have claims relating to one or both protected characteristics.
The Equality Act also protects against discrimination based on perception and association. This means a person may be protected if they are treated unfavourably because they are perceived to be transgender, regardless of whether that perception is correct. Protection may also arise where an individual experiences discrimination because of their connection with, support for, or association with a transgender person.
The law in this area continues to develop through legislation, statutory guidance and court decisions. While recent legal developments have considered the interaction between the protected characteristics of sex and gender reassignment, the Equality Act 2010 continues to provide protection against discrimination, harassment and victimisation related to gender reassignment. Employers should ensure that workplace policies, practices and decision-making processes are inclusive, respectful and compliant with their obligations under equality law, recognising the rights and dignity of all employees.
Marriage and Civil Partnership
Marriage and civil partnership is another protected characteristic. Employers must not treat someone unfavourably because they are married or in a civil partnership. Examples include:
- Refusing promotion because an employee married a colleague.
- Excluding married employees from workplace opportunities.
- Applying different rules to employees in civil partnerships.
When Sex Discrimination May Be Lawful
Not every difference in treatment based on sex will amount to unlawful discrimination. In limited circumstances, the Equality Act 2010 allows employers to justify certain practices or make decisions that would otherwise be discriminatory.
One example is where being of a particular sex is a genuine occupational requirement. This exception applies only where the requirement is crucial to the role and is a proportionate means of achieving a legitimate aim. For example, certain jobs involving privacy, personal welfare or authenticity may lawfully require a person of a particular sex.
The Equality Act also permits employers to take positive action in certain circumstances. Where people sharing a protected characteristic are underrepresented or experience disadvantage, employers may take proportionate steps to encourage participation or address that disadvantage.
In cases of indirect sex discrimination, employers may be able to rely on objective justification. To do so, they must show that the policy, rule or practice is a proportionate means of achieving a legitimate business aim and that there is no less discriminatory way of achieving the same objective.
Examples of situations where an employer may have a legal defence include requirements linked to health and safety, maintaining operational effectiveness, meeting genuine staffing needs, or protecting privacy and dignity. Whether a defence succeeds will depend on the facts of each case.
How to Prove Sex Discrimination
Sex discrimination is often established through a combination of evidence rather than a direct admission by an employer. Employment Tribunals determine claims using the civil standard of proof, known as the balance of probabilities, meaning they decide what is more likely than not to have occurred.
In many cases, claimants rely on a comparator to show they were treated less favourably than someone of a different sex in similar circumstances. However, not every claim requires a direct comparator, particularly where the surrounding evidence clearly points towards discriminatory treatment.
Evidence can take many forms, including direct evidence and documentary evidence such as emails, messages, meeting notes, policies, performance reviews, recruitment records and other workplace documents. Witness evidence from colleagues may also provide important support for a claim. Tribunals can also draw conclusions from circumstantial evidence, such as patterns of decision-making, inconsistent explanations, or the timing of events.
Individuals who believe they have experienced sex discrimination should keep detailed records of incidents, including dates, conversations, correspondence and the names of any witnesses. Contemporaneous records can be extremely valuable if a dispute later arises.
What To Do If You Experience Sex Discrimination
If you believe you have experienced sex discrimination at work, it is often sensible to raise the issue as soon as possible. In some situations, concerns can be resolved informally by speaking with a manager, supervisor or HR representative. Early discussion may help identify misunderstandings and prevent the situation from escalating.
If informal resolution is unsuccessful or inappropriate, employees should consider using their employer’s formal grievance procedure. A grievance should clearly explain what happened, why the treatment is believed to be discriminatory, the evidence available, and the outcome being sought. Employers are expected to investigate complaints fairly, consider the evidence and respond appropriately.
Before most Employment Tribunal claims can be issued, prospective claimants must notify ACAS and participate in Early Conciliation. During this process, an ACAS conciliator attempts to help the parties resolve the dispute without formal litigation. If settlement is not possible, ACAS will issue a certificate that allows the claim to proceed.
Claims for sex discrimination are generally brought in the Employment Tribunal. In most cases, the time limit is three months less one day from the discriminatory act, although the ACAS Early Conciliation process can affect this deadline. Tribunal proceedings typically involve written pleadings, disclosure of documents, witness statements and a final hearing where the evidence is considered by a judge.
Compensation for Sex Discrimination
Employment Tribunals have wide powers when awarding compensation for sex discrimination. The aim is to place the individual, as far as possible, in the position they would have been in had the discrimination not occurred.
Compensation may include financial losses such as lost earnings, loss of future income, pension losses and loss of workplace benefits. Awards can also be made for injury to feelings, recognising the distress, humiliation and emotional impact caused by discrimination.
Injury to feelings awards are typically assessed using the Vento bands, which provide guidance based on the seriousness of the discrimination. In some cases, additional compensation may be awarded for personal injury where recognised medical harm has been caused.
Tribunals may also award aggravated damages in exceptional cases, add interest to compensation, and make recommendations designed to reduce the impact of discrimination in the workplace. Importantly, there is generally no upper limit on compensation in discrimination claims.
Employer Responsibilities
Employers play a crucial role in preventing sex discrimination and creating an inclusive workplace. Compliance with the Equality Act 2010 requires more than simply responding to complaints after they arise.
Employers should have clear equality, diversity and anti-harassment policies that set out expected standards of behaviour and explain how concerns can be reported. Regular staff training can help employees understand their rights and responsibilities while reducing the risk of discriminatory conduct occurring in the workplace.
Recruitment, promotion, performance management and disciplinary processes should be based on objective criteria and applied consistently. Employers should also investigate complaints promptly, take appropriate action where issues are identified, and regularly review workplace practices to identify potential barriers to equality.
Creating a workplace culture based on respect, inclusion and equal opportunity not only helps employers meet their legal obligations but also supports employee wellbeing, engagement and retention.
Frequently Asked Questions
What counts as sex discrimination?
Sex discrimination occurs when someone is treated less favourably, placed at a disadvantage, harassed or victimised because of the protected characteristic of sex.
Can someone of any sex bring a sex discrimination claim?
Yes. Protection under the Equality Act 2010 applies regardless of a person’s sex. Individuals are protected from unlawful discrimination because of their sex.
What evidence do I need?
Useful evidence can include emails, messages, witness statements, policies, meeting notes, performance reviews and records of discriminatory incidents.
How long do I have to make a claim?
Most Employment Tribunal claims for sex discrimination must be brought within three months less one day of the discriminatory act, subject to any extension resulting from ACAS Early Conciliation.
Can I bring a claim while still employed?
Yes. Many discrimination claims are brought during employment rather than after employment has ended.
Do I have to raise a grievance first?
There is no absolute requirement to raise a grievance before bringing a claim, but doing so may help resolve the issue and is often encouraged.
Can I claim if I was not hired?
Yes. The Equality Act 2010 protects job applicants as well as employees and workers.
Conclusion
The Equality Act 2010 provides robust protection against sex discrimination in the workplace, including direct discrimination, indirect discrimination, harassment and victimisation. These protections apply throughout the employment relationship, from recruitment and promotion to dismissal and post-employment references.
Anyone who believes they have experienced sex discrimination should act promptly, as Employment Tribunal claims are subject to strict time limits. Keeping records, seeking advice and raising concerns at an early stage can help protect your position and improve the prospects of a successful outcome.
