Proving discrimination rarely depends on finding an email admitting prejudice. More often, a case is built from decisions, conversations, records and differences in treatment that make sense together. If you want to know how to prove discrimination in the UK, the question is not simply whether something felt unfair, but which facts could show unlawful conduct.
The Equality Act 2010 applies in England, Wales and Scotland across settings including work, services and education. Northern Ireland has separate equality legislation. The relevant legal test depends on the allegation, so identify the conduct you are challenging before collecting evidence.
Identify the act, date and possible legal ground
Write down what happened. Was a promotion refused, a service withdrawn, a complaint followed by punishment, or a disability-related adjustment denied? Record who made the decision, when it happened, the reasons given and the effect on you.
Identify the protected characteristic or protected conduct involved. Direct discrimination, indirect discrimination, harassment, victimisation and failure to make reasonable adjustments have different legal requirements. A guide to protected characteristics under the Equality Act can help clarify which protections may apply.
What discrimination evidence is useful?
Keep contemporaneous records
Preserve original emails, messages, meeting invitations, job adverts, application scores, policies and complaint responses. Note when each document was created and who received it. A dated record made before a dispute arose may be more persuasive than a later recollection.
Create a chronology showing each event, its date and supporting evidence. Imagine a manager praises an employee’s performance on Monday, learns of her pregnancy on Tuesday and withdraws an agreed opportunity on Friday. The sequence warrants examination, although timing alone cannot establish why the decision was made.
Look for witnesses and changing explanations
Ask witnesses to record what they personally saw or heard, distinguishing observation from rumour. Retain the organisation’s explanations, particularly if they contradict documents or change over time. Inconsistency can support an inference, but does not automatically prove discrimination.
Gather information lawfully. Do not access private accounts, publish colleagues’ personal data or remove confidential documents without authority. A subject access request can sometimes obtain personal data held about you, but is not a general right to every internal record.
How comparators can reveal unequal treatment
In many direct discrimination claims, a comparator is someone without the relevant protected characteristic who was, or would have been, treated more favourably in materially similar circumstances. Section 23 of the Equality Act requires there to be no material difference in circumstances relevant to the comparison.
Suppose two employees apply for a promotion. Their experience and performance records are similar, but one is rejected after the employer learns of their religion. Interview scores, selection criteria and the successful applicant’s qualifications may help explain the decision.
The comparator discrimination exercise must be fair. A required qualification held by only one applicant could explain different outcomes. An actual colleague is not essential in every direct discrimination case: decision-makers can consider a hypothetical comparator supported by the facts.
Do not force comparisons onto every claim. Pregnancy and maternity discrimination, some harassment allegations, victimisation and failures to make reasonable adjustments do not require the same conventional comparator exercise. Indirect discrimination typically examines a rule or practice, group disadvantage and whether the respondent can justify it.
Understanding the burden of proof under the Equality Act
Section 136 sets out how courts and employment tribunals assess proof. Initially, there must be facts from which the decision-maker could conclude, without another explanation, that the Act was breached. If that threshold is reached, the respondent must demonstrate that it did not contravene the Act.
This shifting burden of proof does not mean that an allegation alone makes the organisation responsible for disproving it. The initial evidence must support an inference. Equally, direct admission of discriminatory intent is not always necessary. The evidence and explanations are considered together.
Think about connected facts: an unexplained departure from normal procedure, remarks referring to a protected characteristic, an adverse outcome and an inconsistent explanation. None may decide the case alone; their combined significance matters.
Build a claim that can be tested
Ask focused questions
Request the criteria used, the identity of the decision-maker and whether the same standards applied to others. Acas describes a question-and-answer process for workplace discrimination concerns. Preserve both your questions and the responses.
At work, consider raising concerns through the employer’s grievance process. Guidance on how to raise a workplace grievance can help you prepare. A grievance creates a record but generally does not stop an employment tribunal deadline.
Separate the event from its alleged cause
A witness may confirm that a meeting occurred without knowing why a decision followed. Ask what connects the conduct to a protected characteristic or protected act. Consider credible alternative explanations rather than ignoring them. A persuasive case explains why the evidence supports unlawful discrimination.
Also preserve records of relevant losses, such as missed earnings or expenses. These may matter when assessing remedies, although proving discrimination and proving financial loss are separate questions.
Check the deadline before waiting for answers
For most employment tribunal claims in Great Britain concerning acts on or after 1 October 2026, the time limit is six months less one day. For many acts before that date, the previous three-months-less-one-day limit applies. Continuing conduct and transitional rules can complicate matters.
Usually, you must notify Acas before bringing an employment tribunal claim. Timely early-conciliation notification can pause the clock. Claims about services in civil courts have different procedures and limitation periods. Check the relevant forum promptly; internal complaints do not usually suspend deadlines. Further guidance on discrimination claim time limits can help you plan.
Frequently asked questions
Can I prove discrimination without written evidence?
Potentially. Oral testimony, witness accounts, patterns of treatment and reasonable inferences can all matter. Written records usually make events easier to establish, so record your recollections promptly.
Must someone else have been treated better?
Not always. Actual or hypothetical comparators may matter for direct discrimination, but other claims use different legal tests. The correct approach depends on what happened.
Does unfair treatment automatically amount to discrimination?
No. Treatment may be unreasonable without meeting the requirements of an equality-law claim. Evidence must connect the conduct to the relevant legal test.
Can I bring a claim while a grievance is ongoing?
Potentially, yes. Internal procedures generally do not stop legal time limits. Check Acas requirements and the applicable deadline before deciding when to file.
Conclusion
To prove discrimination, create an accurate chronology, preserve original evidence, test explanations and choose comparisons carefully. The burden-of-proof rules can assist when facts support an inference, but cannot replace sound preparation. Seek timely advice from Acas, Citizens Advice or a qualified legal adviser where necessary.