Equal Pay Claims and Sex Discrimination Explained

Equal pay claims relate to situations where employees of different sexes (usually women compared with men) are paid differently for doing work that is equal in value. These claims sit at the intersection of equal pay law and sex discrimination under the Equality Act 2010. This guide explains the legal principles governing equal pay, how claims work, the role of comparators, time limits and remedies, and practical steps for workers and employers in England and Wales. Equal pay has been the subject of extensive litigation and high‑value claims, including significant settlements for local authority workers.

What Is Equal Pay Law?

Equal pay law means that men and women in the same employment must receive equal pay and contractual terms for equal work unless the employer can justify differences for reasons unrelated to sex. Pay and terms include basic salary, overtime, holiday entitlement, bonuses, pension rights and other contractual benefits.

Equal pay rights arise from the Equality Act 2010 and are supported by the Equal Pay Statutory Code of Practice issued by the Equality and Human Rights Commission (EHRC).

When Can a Claim Arise?

An equal pay claim may arise where a worker (often a woman) is paid less than a person of the opposite sex (a male comparator) doing work that is:

• Like work – the same or broadly similar work, where differences are not of practical importance;
• Rated as equivalent – work that has been evaluated and given the same grade under a valid job evaluation scheme; or
• Work of equal value – different work that carries similar demands in terms of skill, effort, responsibility and decision‑making.

The comparator must be employed by the same employer or an associated employer (for example, within the same group) or there must be a single source responsible for setting terms and conditions.

How Equal Pay Intersects With Sex Discrimination

Equal pay rights are a specific form of sex discrimination protection. If an employee can show that their pay or contractual terms are worse than a comparator of the opposite sex for equal work and the difference is not due to a material factor unrelated to sex, this can amount to unlawful sex discrimination. In that scenario:

• The employee (claimant) must first show that they are paid less than the comparator for equal work;
• The employer must then show that the pay difference is due to a material factor not linked to sex and that it is the real reason for the difference;
• If the employer cannot demonstrate a legitimate material factor, the claim succeeds;
• Even if a material factor exists, it may still be indirect discrimination if it disproportionately disadvantages one sex and is not justified by a proportionate means of achieving a legitimate aim.

Examples of material factors might include differences in hours worked, market forces, job responsibilities, geographic necessity or recognising specific skills or long service, provided these are genuinely unrelated to sex.

Bringing an Equal Pay Claim: Process and Time Limits

Early Conciliation

Before a formal claim can be lodged with an employment tribunal, the claimant must notify ACAS and engage in early conciliation to explore settlement.

Time Limit for Tribunal Claims

Equal pay claims generally must be presented to a tribunal within six months of the end of employment with the employer against whom the claim is brought. If the claimant is still employed, the time limit does not start.

The six‑month period is strict. If the deadline is missed, the tribunal cannot normally hear the claim, although in limited circumstances a civil court claim may be possible within six years, but this is more complex and usually not preferable due to cost and complexity.

Comparators: Key to Equal Pay Claims

A crucial element in any equal pay claim is identifying a valid comparator of the opposite sex who is doing equal work. The comparator can be a current or former employee and may work in a different location if terms and conditions are set by the same “single source”.

Claimants may use more than one comparator to support their case, for example where different male colleagues are paid more for similar roles.

Remedies and Outcomes in Equal Pay Claims

If an equal pay claim is successful, the employment tribunal can order a range of remedies:

• Declarations that the claimant has been treated unlawfully;
• Equal pay terms inserted into the claimant's contract for the future;
• Back pay to make up the difference in pay and contractual terms, potentially going back up to six years from the date the claim was filed; and
• Interest on compensation awarded.

Tribunals can also award remedies for indirect discrimination if relevant. Victimisation protections prevent an employee from being disadvantaged for raising pay issues or assisting a claim.

Practical Steps Before Making a Claim

1. Ask Questions and Gather Evidence

Employees suspecting unequal pay can start by asking the employer for pay information, explaining why they believe there is a disparity and identifying potential comparators. This “question and answer” process can help clarify whether a claim is viable and may assist in resolving the issue internally.

2. Raise a Grievance

If the initial enquiry does not resolve the issue, a formal grievance can be raised, documenting concerns and giving the employer a chance to address them.

3. Early Conciliation

Submit an ACAS Early Conciliation Notification Form and explore settlement before tribunal proceedings.

4. Tribunal Claim

If conciliation fails, prepare and submit an ET1 form within time, setting out the equal pay and any related sex discrimination elements.

High‑Profile Equal Pay Cases

Large equal pay disputes have made headlines, such as cases involving local government workers and supermarket employees. In local authority claims, settlements have exceeded £1 billion for women in roles like cleaning and care work whose pay was historically lower than male comparators in heavier manual roles.

Another major case saw thousands of workers at a UK supermarket win a tribunal finding on equal value comparisons, potentially leading to multi‑billion‑pound liabilities for unequal pay structures.

These cases illustrate how equal pay law can underpin group litigation where many employees with similar claims seek collective redress.

Common Questions About Equal Pay Claims

Can a man bring an equal pay claim against a woman?
Yes. Equal pay rights are reciprocal: both men and women are protected, and either can be a claimant or comparator, provided the comparator is of the opposite sex and meets the statutory criteria for equal work.

Does equal pay cover bonuses and pensions?
Yes. Equal pay applies to basic pay and contractual terms and conditions, including bonuses, pensions and other benefits where they are part of contractual terms.

What if the employer changes contracts?
If terms change significantly, time limits may reset depending on the nature of the change; this can complicate claims and is a reason to seek specialist advice.

Summary

Equal pay claims under the Equality Act 2010 ensure that men and women receive the same pay and contractual terms for equal work, equal value or work rated as equivalent. A claim requires identifying a valid comparator of the opposite sex, showing a pay disparity and disproving material factors unrelated to sex. Time limits for tribunal claims are strict and early steps such as asking questions and raising grievances can be important. Successful claims can result in back pay, contractual equalisation and protections against victimisation. High‑value and group claims in recent years highlight the ongoing importance and potential impact of equal pay law in the UK workplace.