Unlawful Retaliation Following Termination

When employment ends, the relationship between former employer and ex‑employee does not simply cease having legal consequences. In some circumstances, former employees may experience unlawful retaliation because they asserted legal rights, raised complaints, made disclosures, or participated in protected activity before or after termination. Retaliation can take the form of negative references, derogatory communications, exclusion from opportunities, or other detriment intended to punish or discourage lawful action. This article explains what constitutes unlawful retaliation after termination under UK law, the relevant legal protections, the types of claims that former employees can bring to an Employment Tribunal or court, time limits, evidence and practical steps for both claimants and employers.

What Is Unlawful Retaliation Following Termination?

Unlawful retaliation occurs when an employer (or someone acting on its behalf) subjects a former employee to adverse treatment because of the former employee's protected act or legal assertion. In the employment context, retaliation is often discussed under two legal areas:

• Victimisation and discrimination under the Equality Act 2010 (treatment because of a protected act); and
• Detriment and unfair dismissal protections under the Employment Rights Act 1996 and the Public Interest Disclosure Act 1998 (for whistleblowing and assertion of statutory rights).

These protections can arise both before and, in certain cases, after employment has ended.

Legal Protections Against Retaliation

Victimisation Under the Equality Act 2010

The Equality Act 2010 makes it unlawful for an employer to treat someone less favourably because they have done a “protected act” related to discrimination or harassment. A protected act can include:

• Making a complaint of discrimination or harassment;
• Supporting a colleague's complaint;
• Acting as a witness in a discrimination case;
• Gathering evidence for a claim; or
• Saying something that does not support another person's discrimination claim.

If treatment is retaliatory because of a protected act, it may constitute victimisation – a form of unlawful discrimination.

Victimisation can include behaviours such as exclusion, negative communications, loss of opportunities, demotion, or refusal to provide a reference if these actions are linked to the protected act.

Case authority suggests that retaliation after a discrimination claim may be unlawful if it “makes the situation worse” because of the protected act; tribunals and courts have addressed such claims even where conduct occurs after termination.

Key point: A former employee may still bring a victimisation claim if adverse treatment is linked to a protected act, though the precise scope of post‑employment victimisation has been subject to legal interpretation.

Whistleblowing and Detriment Claims

Employees and former employees who make a protected disclosure (commonly referred to as whistleblowing) are protected from retaliation. The Public Interest Disclosure Act 1998 (as incorporated into the Employment Rights Act 1996) prohibits detriment or dismissal because an individual has made a disclosure about wrongdoing in the public interest.

Under the whistleblowing regime:

• A person cannot suffer a detriment – including dismissal – because they made a protected disclosure;
• A dismissal for whistleblowing is automatically unfair, and no minimum length of service is required; and
• A former employee can pursue a detriment claim if adverse treatment after termination is linked to their protected disclosure.

The Employment Rights Act also allows claims where detriment (such as refusal of reference or communication that harms future prospects) occurs because of the earlier whistleblowing.

Assertion of Statutory Rights

Under the Employment Rights Act 1996, an employee who asserts statutory employment rights before termination (such as holiday pay, unpaid wages or the right to be accompanied) is protected from dismissal and other detriments if the employer retaliated because of that assertion. Tribunals will consider whether asserting rights was a principal reason for subsequent dismissal or detriment.

This protection applies even if the underlying statutory complaint was unfounded, provided the assertion was made in good faith and was sincerely believed.

Examples of Retaliatory Conduct After Termination

Unlawful retaliation following termination may include:

• Providing false or adverse references because an ex‑employee raised complaints or pursued claims;
• Negative communications to prospective employers or third parties intended to harm the former employee's prospects;
• Exclusion from benefits or opportunities that would otherwise be available;
• Verbal or written derogatory statements linked to past protected activity.

For example, a tribunal found victimisation where a person was dismissed by a subsequent employer after their former employer refrained from providing references due to ongoing discrimination proceedings.

Bringing a Claim for Retaliation

Employment Tribunal Claims

Former employees who believe they have suffered unlawful retaliation can bring claims before an Employment Tribunal. The specific causes of action depend on the nature of the retaliation:

• Victimisation under the Equality Act 2010: Compensation claims for detriment linked to a protected act.
• Automatic unfair dismissal: Where dismissal was in retaliation for whistleblowing.
• Detriment claims: For adverse treatment linked to protected disclosures or statutory rights assertions.

Tribunal claims must be made within three months minus one day of the retaliatory conduct (or effective date of termination for dismissal claims), subject to Acas Early Conciliation. (Standard tribunal time limits; see gov.uk procedures.)

Evidence and Burden of Proof

To succeed in retaliation claims, the claimant must demonstrate:

• They engaged in a protected act or asserted a statutory right in good faith;
• They suffered a detriment or dismissal following that act; and
• There is a causal link between the protected act and the retaliatory conduct.

Once this is established, the burden of proof may shift to the employer to demonstrate that the adverse treatment was for a non‑retaliatory reason. This two‑stage approach is common in victimisation and discrimination contexts.

Documentation such as emails, reference content, internal records, and witness statements can support a retaliation claim, particularly where timing and motive are pivotal.

Time Limits and Acas Early Conciliation

Employment Tribunal claims, including those for victimisation or retaliation, generally need to be started within three months minus one day from the date of the retaliatory act, such as receipt of an adverse reference or communication. Early Conciliation with Acas is a mandatory preliminary step for most claims and can extend the time limits while conciliation is ongoing. (Standard gov.uk tribunal guidance.)

Employer Considerations and Defences

Employers facing retaliation claims should:

• Ensure reference letters and communications are factually accurate and evidence‑based;
• Avoid any actions that could be perceived as punishing former employees for protected acts;
• Document legitimate reasons for decisions that might otherwise appear retaliatory; and
• Seek legal advice when managing disputes involving protected disclosures or statutory rights.

A common employer defence is that the treatment was for a legitimate non‑retaliatory reason unrelated to the protected act. Demonstrating clear, contemporaneous documentation of decision‑making can aid this defence.

Practical Steps for Claimants

Claimants concerned about unlawful retaliation should:

• Document the retaliatory conduct, including dates, content and context;
• Retain any correspondence or references that may be relevant;
• Initiate Acas Early Conciliation promptly;
• Seek legal advice to clarify the appropriate cause of action (victimisation, detriment, whistleblowing).

Key Takeaways

Unlawful retaliation following termination in England and Wales encompasses a range of detrimental conduct connected to an employee's protected acts or assertion of rights. Legal protections arise under the Equality Act 2010 (victimisation), the Employment Rights Act 1996 (assertion of statutory rights) and whistleblowing legislation. Retaliation can occur before or after termination, and former employees may bring Employment Tribunal claims when they suffer detriment or dismissal linked to protected activity. Time limits are strict, and evidence of motive and timing is key to success. Employers should take care to avoid retaliatory actions that could expose them to claims and financial liability.