Balance of probabilities

The standard a tribunal, court or ombudsman uses to decide disputed facts in civil proceedings. Far lower than the criminal threshold, it asks simply whether your account of events is more likely than not — and that makes all the difference to how you build a case.

Is the balance of probabilities the same as 51% certainty?

The 51% framing is a useful rough guide but courts do not use arithmetic. The balance of probabilities means that, on the evidence as a whole, it is more probable than not that the fact occurred. The tribunal or judge weighs up all the evidence — documents, witness accounts, inherent plausibility — and decides which version is more likely. A case that is marginally more likely to be true on the evidence is enough. There is no percentage calculation taking place.

How is the balance of probabilities different from beyond reasonable doubt?

Beyond reasonable doubt is the criminal standard. It requires a much higher level of confidence — the evidence must be so compelling that no reasonable person would doubt the defendant's guilt. The civil standard — balance of probabilities — is lower. This is why the same incident can result in a not guilty verdict in a criminal court (because the criminal standard was not met) and a finding for the claimant in an employment tribunal or civil court (because on the balance of probabilities their account was more likely than the defendant's).

Does the standard change depending on how serious the allegation is?

The legal standard does not change — it remains the balance of probabilities throughout. However, the evidence needed to satisfy it may be stronger for more serious allegations, because inherent probability plays a part. A tribunal assessing whether a manager occasionally forgot to fill in timesheets may be easily persuaded on limited evidence. A tribunal assessing whether a senior HR director fabricated a disciplinary record may require more cogent evidence, because that is inherently less probable conduct. The standard is the same; what it takes to meet it can vary.

Who has to prove the case on the balance of probabilities?

This depends on the type of claim and the specific issue. Generally the person making a claim must prove it. However, the burden shifts in some circumstances — most importantly in discrimination claims, where once a claimant shows facts from which discrimination could be inferred, the burden moves to the employer to disprove it. In authorised push payment fraud complaints, the burden of proving the narrow gross negligence exception falls on the bank, not the customer. The balance of probabilities is the standard applied once the burden is clear.

What happens if the evidence is exactly equal on both sides?

If the tribunal genuinely cannot decide which account is more likely, the party who carried the burden of proof on that issue loses. The balance of probabilities is the threshold: if you cannot tip the scale past even, the party who needed to prove the point has failed to do so. This is why identifying who bears the burden on each issue matters: in a tie, burden determines the outcome.

Does the balance of probabilities apply in renters' rights disputes?

Yes. The First-tier Tribunal (Property Chamber) applies the civil standard in possession claims, rent repayment order applications and most housing disputes. Tenants and landlords must prove their case on the balance of probabilities. Evidence such as repair logs, inspection reports, correspondence and dated photographs all contribute to meeting that standard. The same standard applies when a tenant argues that a landlord has failed to carry out repairs in breach of the Housing Health and Safety Rating System obligations.

What "more likely than not" means in practice

Every civil dispute turns on facts the parties disagree about. Someone was dismissed, or a payment was never made, or a property had damp. Each of these is a factual question, and tribunals and courts have to decide them. The balance of probabilities is the rule that tells them how confident they need to be before treating a fact as established.

The classic statement comes from Lord Denning in

Miller v Minister of Pensions

in 1947. Proof on the balance of probabilities does not require certainty — it does not have to remove all doubt — but it must carry a degree of conviction. If the tribunal cannot say which account is more likely, the fact is not proved. If it can say — even on the thinnest margin — that one account is more probable, that account is taken as true.

The House of Lords confirmed in

[2008] that there is only one civil standard: the balance of probabilities. There is no sliding scale where more serious allegations require a higher probability. In practice, however, the evidence needed to reach the standard varies with the seriousness of what is alleged, because

inherent probability

is itself part of the evidential calculus. An allegation that a manager raised their voice is inherently plausible and may be proved on fairly limited evidence. An allegation that a board director fabricated financial records requires more cogent evidence to reach the same probability threshold — not a higher standard, but a harder standard to meet on the same facts.

In contrast to the criminal standard — beyond reasonable doubt, which requires the tribunal to be sure — the civil standard is accessible. A well-documented, consistent account supported by contemporaneous records will routinely meet it, even where some doubt about exactly what happened remains. This is why documentary evidence matters so much: an employer who cannot explain why a dismissal letter says one thing but a meeting note says another may find the tribunal treats the employee

s account as more probable simply because the documentary record is inconsistent.

Employment Tribunal.

Sam claims he was dismissed because he reported a health and safety concern. His employer says the dismissal was for poor attendance. There are two written accounts of a meeting with the manager — Sam

s contemporaneous note and an employer

s summary written two weeks later. Sam

s note mentions the health and safety issue. The employer

s summary does not. The tribunal treats Sam

s account as more likely on the balance of probabilities, because a note written in the room the same day carries more weight than one written weeks later.

A customer sues a builder for leaving a job unfinished. The builder says the work was complete. The customer has dated photographs taken the day the builder stopped attending. The builder has no site records. The judge finds it more likely than not that the work was incomplete — the photographs are cogent evidence the builder cannot answer.

A bank argues that a customer who lost money to an investment fraud was grossly negligent in not spotting the warning signs. The bank must prove gross negligence on the balance of probabilities. The customer had no prior experience of investing, acted on a referral that appeared to come from a trusted source, and the fraud used a cloned FCA-authorised firm

s details. The adjudicator finds it more likely than not that the customer was not grossly negligent — the bank has not met the standard.

Protected characteristics

Miller v Minister of Pensions [1947] 2 All ER 372 — founding statement of the civil standard

In re B (Children) [2008] UKHL 35

Equality Act 2010, s.136

Employment tribunals

Balance of probabilities — the civil standard of proof

Balance of probabilities explained in plain English: what it means, how it differs from beyond reasonable doubt, and how tribunals apply it.

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