What Is the Definition of Pay Discrimination?

Pay discrimination in UK employment law refers to situations where an individual is paid less than another person for equal or comparable work because of a protected characteristic. It is a core issue under equality legislation in England and Wales, particularly the Equality Act 2010, which prohibits unlawful discrimination in pay and other employment terms.

Pay discrimination claims often arise in the context of equal pay disputes, but the concept is broader and can include any unjustified pay difference linked to characteristics such as sex, race, disability, age, or other protected traits.

Legal Definition of Pay Discrimination

Pay discrimination occurs when:

An employee or worker receives less favourable pay or contractual remuneration than another person in a comparable position, and the difference is because of a protected characteristic under UK equality law.

The main legal framework is the:

Equality Act 2010

This legislation makes it unlawful for employers to discriminate directly or indirectly in relation to:

• Pay
• Bonuses
• Pension benefits
• Allowances
• Other contractual employment benefits

Pay discrimination is most commonly associated with equal pay claims between men and women, but it applies across all protected characteristics.

What Counts as Pay Discrimination?

Pay discrimination is not limited to intentional unfair treatment. It can occur in several forms:

1. Direct pay discrimination

This occurs when a person is explicitly paid less because of a protected characteristic.

Example situations include:

• A woman being paid less than a man for the same role
• A disabled worker receiving lower pay due to assumptions about capability
• A younger worker being paid less purely due to age

2. Indirect pay discrimination

This happens when a pay structure or policy applies equally but disadvantages a group with a protected characteristic.

Examples include:

• Bonus schemes requiring full-time hours that disadvantage women with caring responsibilities
• Pay progression rules that disproportionately affect older workers
• Shift allowances structured in a way that excludes certain groups

Indirect discrimination is unlawful unless the employer can justify it as a proportionate means of achieving a legitimate aim.

3. Equal pay claims (work of equal value)

A key form of pay discrimination arises under equal pay law, where employees can compare their pay with others doing:

• The same work
• Work rated as equivalent
• Work of equal value

If a pay difference exists and cannot be justified by material factors unrelated to sex or other protected characteristics, it may be unlawful.

Protected Characteristics Relevant to Pay Discrimination

Under the Equality Act 2010, pay discrimination can relate to any protected characteristic, including:

• Sex
• Race
• Disability
• Age
• Pregnancy and maternity
• Religion or belief
• Sexual orientation
• Gender reassignment
• Marriage and civil partnership (in limited contexts)

Each category can give rise to different types of pay-related claims depending on the circumstances.

How Employers Can Justify Pay Differences

Not all pay differences are unlawful. Employers may justify differences if they are based on “material factors” unrelated to discrimination, such as:

• Skills or qualifications
• Experience or seniority
• Market rate pressures for specific roles
• Performance-related pay systems
• Geographic location of work

However, the justification must be:

• Genuine
• Non-discriminatory in effect
• Objectively verifiable
• Proportionate

If a justification is weak or indirectly linked to a protected characteristic, it may still amount to unlawful pay discrimination.

Legal Framework for Pay Discrimination Claims

Pay discrimination claims are usually brought under the Equality Act 2010 in Employment Tribunals.

Key legal routes include:

Equal pay claims

Focused on pay differences between employees performing equal work.

Direct discrimination claims

Where pay differences are explicitly linked to a protected characteristic.

Indirect discrimination claims

Where neutral pay policies disproportionately disadvantage certain groups.

Victimisation claims

Where an employee is treated unfairly after raising concerns about pay equality.

Burden of Proof in Pay Discrimination Cases

In UK law, the burden of proof works in two stages:

1. The claimant must establish facts that suggest discrimination may have occurred
2. The employer must then provide a non-discriminatory explanation

Tribunals assess evidence such as:

• Pay structures
• Job descriptions
• Comparator roles
• HR records and policies

Time Limits for Pay Discrimination Claims

Strict deadlines apply:

• Employment Tribunal claims: generally 3 months less one day from the discriminatory act
• In equal pay cases, claims can sometimes cover a longer back pay period depending on circumstances
• ACAS Early Conciliation is required before submitting most claims

Failure to act within time limits may prevent a claim being heard.

Remedies for Pay Discrimination

Where a tribunal finds unlawful pay discrimination, remedies may include:

1. Back pay

Payment of arrears covering underpaid wages, often going back several years depending on the claim type.

2. Compensation for injury to feelings

Awarded in discrimination cases where applicable.

3. Equalisation of pay

Adjustment of pay going forward to ensure compliance with equality law.

4. Interest on awards

Added in some cases to reflect delayed payment.

Common Examples of Pay Discrimination

Pay discrimination issues frequently arise in:

• Gender pay gaps in equivalent roles
• Unequal bonus schemes across departments
• Lower pay for part-time or flexible workers (often indirectly affecting women)
• Disability-related reductions in pay or hours
• Age-based pay banding systems
• Race-based disparities in promotion-linked pay increases

Employer Duties to Prevent Pay Discrimination

Employers are expected to:

• Maintain transparent pay structures
• Ensure equal pay for equal work
• Regularly review pay gaps
• Avoid discriminatory criteria in pay decisions
• Comply with Equality Act 2010 obligations

Large employers may also be required to publish gender pay gap reports.

Common Legal Issues in Pay Discrimination Cases

Disputes often involve:

• Disagreement over whether roles are truly comparable
• Lack of transparency in pay decisions
• Use of vague “market rate” justifications
• Failure to account for part-time or flexible working impacts
• Historical pay inequalities carried forward

These issues frequently lead to Employment Tribunal claims.

Key Takeaways

Pay discrimination in UK employment law refers to unlawful differences in pay that arise because of a protected characteristic under the Equality Act 2010. It can occur directly, indirectly, or through unequal pay for equal work. While employers may justify differences based on objective factors such as experience or market conditions, any justification must be non-discriminatory and proportionate. Claims are typically brought in Employment Tribunals and can result in significant compensation and pay correction orders.