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Equal Pay: Your Right to Equal Pay for Equal Work

Last updated: Checked against primary legislation on legislation.gov.uk

Under the Equality Act 2010, men and women who do equal work for the same employer are entitled to equal pay. This applies to all contractual terms, not just basic salary, but also bonuses, holiday entitlement, overtime rates, and pension contributions. Pay discrimination on the basis of sex has been unlawful since the Equal Pay Act 1970. This guide explains how equal pay works, how to find a comparator, and how to bring a claim.

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What is the right to equal pay?

Every employment contract contains an implied equality clause under the Equality Act 2010. This means that if you are doing equal work to a comparator of the opposite sex, your contract terms must be at least as favourable as theirs.

  • Applies to all employees and workers, including part-time, fixed-term, and agency workers
  • Covers all contractual terms: pay, bonuses, overtime rates, sick pay, holiday entitlement, pension, company car
  • Applies where you and your comparator work for the same employer (or associated employer)
  • The comparator must be of the opposite sex, equal pay law protects against sex discrimination specifically
  • For race or disability pay gaps, you must use the general discrimination provisions of the Equality Act instead
Gender pay gap vs equal pay: These are different things. The gender pay gap is the average difference in earnings between men and women across an organisation, it is not unlawful in itself. Equal pay is the legal right to equal pay for equal work, a breach is unlawful. An employer can have a large gender pay gap without breaching equal pay law if men and women are in different roles.

What counts as 'equal work'?

Equal pay law covers three types of equal work. You only need to satisfy one:

Like work
The same or very similar work, with any differences not being practically important. For example: two supervisors doing essentially the same job, even if their job titles differ slightly.
Work rated as equivalent
Your job and your comparator's job have been rated as equivalent under a formal job evaluation scheme, even if the jobs are quite different. The rating must be analytical and apply across the workforce.
Work of equal value
The work you do is of equal value in terms of demands such as effort, skill, and decision-making, even if the jobs are completely different. This is the most complex route but the most commonly used in tribunal claims.

Who can be your comparator?

Choosing the right comparator is the most important step in an equal pay claim:

  • Your comparator must be of the opposite sex
  • They must work for the same employer, or an associated employer (e.g. different companies in the same group)
  • They can work at a different location, but their terms and conditions must be broadly governed by a single source (e.g. a group-wide pay scale)
  • You can use a current comparator (someone currently employed) or a predecessor (someone who did your job before you on better terms)
  • You can have multiple comparators, this strengthens the claim
  • You cannot use a hypothetical comparator in equal pay claims, the person must be real and identifiable
You cannot compare yourself to someone at a different employer, even if they do the same job and the jobs are identical. This is a strict rule. The only exception is associated employers, where the same body controls both employers and their pay is set by a single source.

The 'material factor' defence

Even if you can show you do equal work, your employer can justify the pay difference if they can prove a material factor, a genuine reason unrelated to sex:

  • Different geographical location (e.g. London weighting, market rate differences by region)
  • Different skills, qualifications, or experience that genuinely justify higher pay
  • Length of service, provided it is a proportionate way of rewarding loyalty
  • Different shift patterns (e.g. unsocial hours premium for night workers)
  • Performance-related pay, if the performance system is transparent and genuinely applied
  • Red-circling, protecting someone's pay after demotion or restructure (but only if time-limited and non-discriminatory in origin)
The material factor defence fails if the factor relied on is itself tainted by sex discrimination, for example, if a pay system historically paid women less and the employer is now perpetuating that difference. The employer must show the factor is both genuine and not the product of past discrimination.

Your right to pay information

To bring an equal pay claim, you need to know what your comparator earns. UK law gives you some tools for this:

  • You can ask your employer what a named comparator earns, your employer does not have to tell you, but a refusal or evasion can be used against them as evidence in tribunal
  • You can use the ACAS Equal Pay questionnaire (now called the discrimination questionnaire) to ask your employer formal questions about pay
  • Trade union representatives may have access to pay data through collective bargaining, ask your union rep
  • For public sector employers: Freedom of Information Act requests can sometimes reveal pay scales and banding
  • Gender pay gap reports (published by employers with 250+ staff) may reveal information about pay structures
  • The Employment Tribunal has power to order disclosure of pay information from the employer once proceedings have started

How to bring an equal pay claim

1
Identify your comparator
Find a real, named colleague of the opposite sex who you believe is doing equal work (like work, work rated as equivalent, or work of equal value) and is paid more than you. Document why you believe the work is equal.
2
Raise a grievance first
Before going to tribunal, raise a formal grievance with your employer. This is not a legal requirement, but it is strongly recommended, it may resolve the matter without litigation and demonstrates you tried to resolve it internally. Keep copies of everything.
3
Notify ACAS: Early Conciliation
Before you can submit an Employment Tribunal claim, you must notify ACAS and go through Early Conciliation. ACAS will contact your employer to see if a settlement is possible. This is free and pauses the tribunal time limit while it takes place.
4
Submit your ET1 claim form
If Early Conciliation fails, submit your ET1 claim to the Employment Tribunal. Equal pay claims are complex, you will need to state the type of equal work (like work, equivalent, or equal value), identify your comparator, and set out the pay difference. Getting specialist legal advice at this stage is strongly recommended.
5
The tribunal process
Equal pay cases often involve a preliminary hearing to assess whether the work is equal. For 'equal value' claims, an independent expert may be appointed to evaluate the jobs. These cases can take 12 to 24 months. You can be awarded up to 6 years' back pay if successful.

Time limits, act quickly

  • Standard time limit: 6 months from the last day of your employment, or from any act complained of while still employed
  • If still employed: you can bring a claim at any time, but the 6-year back pay limit applies (back to when the underpayment started)
  • If you have left employment: you must claim within 6 months of the date employment ended
  • Stable working arrangement rule: if you have been doing the same job at the same pay for years, the clock may run from any later relevant act (e.g. a pay review that perpetuates the gap)
  • This is different from unfair dismissal (3 months), equal pay has a 6-month time limit
Equal pay cases are among the most complex employment law claims. The rules around comparators, equal value, and material factor defences are highly technical. If you think you have an equal pay claim, get advice from an employment solicitor, your trade union, or Citizens Advice as early as possible.

What compensation can you receive?

  • Back pay, up to 6 years' worth of underpaid wages (5 years in Scotland under the Prescription and Limitation Act)
  • Interest on the back pay
  • Future pay equality, the equality clause takes effect immediately, so your terms must be equalised going forward
  • There is no cap on the amount that can be awarded, unlike some other discrimination claims
  • Legal costs are not usually awarded in Employment Tribunal, but can be if a party has behaved unreasonably

Equal pay for part-time workers

Part-time workers have separate but overlapping protections:

  • The Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000 give part-time workers the right not to be treated less favourably than comparable full-time workers
  • Pay, hourly rates, access to pension schemes, annual leave, sick pay, maternity/paternity leave, and training all fall within scope
  • The comparator must be a full-time worker in the same or broadly similar work at the same establishment
  • Indirect sex discrimination may also apply, since women are disproportionately part-time, a policy disadvantaging part-time workers may be indirect sex discrimination under the Equality Act

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Need to take action? It can draft a ready-to-send formal letter for you (optional, from £4.99).
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Frequently asked questions

What is the right to equal pay in the UK?

Under the Equality Act 2010, men and women doing equal work for the same employer have a legal right to equal pay. This covers not just basic salary but all contractual terms, bonuses, overtime, sick pay, pension, and holiday entitlement. The right has applied since the Equal Pay Act 1970 and is enforced via the Employment Tribunal.

How do I find out if I'm being paid less than a male colleague?

You can ask your employer what a named comparator earns, they don't have to tell you, but a refusal can be used against them in tribunal. You can also use the ACAS discrimination questionnaire, ask your trade union, or review your employer's gender pay gap report (required for employers with 250+ staff). Once you start tribunal proceedings, the tribunal can order full disclosure of pay information.

Does equal pay only apply to men and women?

Yes, the equal pay provisions of the Equality Act 2010 specifically protect against sex-based pay discrimination. If you believe you are being paid less because of your race, disability, age, or another characteristic, you would need to bring a general discrimination claim under the Equality Act rather than an equal pay claim.

What if my employer says the pay difference is justified?

Your employer can defend an equal pay claim by proving a 'material factor', a genuine reason for the pay difference unrelated to sex, such as different skills, longer service, different location, or shift premiums. However, if the justification is itself the product of historical sex discrimination (e.g. a pay system that historically undervalued women's work), the defence will fail.

How long can I claim back pay in an equal pay case?

If your claim succeeds, you can be awarded up to 6 years' back pay (5 years in Scotland). There is no cap on the total amount. You must bring your claim within 6 months of the last day of employment, or while still employed. The 6-year back pay window means long-running underpayments can result in substantial awards.

Related guides

Discrimination at Work
Protected characteristics and direct/indirect discrimination.
Unfair Dismissal
If pay discrimination leads to resignation or dismissal.
Employment Tribunal
How to bring an Employment Tribunal claim.
Settlement Agreements
Settling an equal pay claim before or during tribunal.
Flexible Working
Flexible working rights, often connected to part-time pay issues.

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https://www.knowyourrightsuk.com/employment/equal-pay
Know Your Rights UK. "Equal Pay: Your Right to Equal Pay for Equal Work." Know Your Rights UK, https://www.knowyourrightsuk.com/employment/equal-pay