Civil Law and UAE: Burden of Proof Principles

1. Introduction

Burden of proof means determining which party must prove a particular fact before the court. In UAE civil and commercial litigation, the basic principle is that the claimant must establish the facts supporting the claim, while the defendant may disprove the claim and rely on defences or contrary evidence.

The principal statute is Federal Decree-Law No. 35 of 2022 on Evidence in Civil and Commercial Transactions, which remains the principal UAE evidence statute. Article 1 states that the claimant has the right to prove the claim and the defendant has the right to disprove it. Article 2 expressly places the onus of proof on the claimant, while the defendant's denial is associated with the oath. (UAE Legislation)

Since 1 June 2026, the UAE's new Civil Transactions Law under Federal Decree-Law No. 25 of 2025 also provides the substantive framework within which civil rights and obligations are determined.

2. Meaning of Burden of Proof

The burden of proof answers three basic questions:

Who must prove the fact?

What fact must be proved?

What happens if the fact is not proved?

For example:

A claims that B borrowed AED 100,000 and failed to repay it.

A generally has to establish:

existence of the loan;

amount of the loan;

obligation to repay;

maturity of repayment; and

non-payment.

B may then:

deny the loan;

prove repayment;

prove that the amount was a gift;

challenge the authenticity of the document; or

establish another legal defence.

Thus:

Claim → claimant's proof → defendant's defence → court's evaluation → judgment

3. Fundamental UAE Rule: “The Claimant Must Prove”

Article 2 of the UAE Evidence Law embodies the traditional principle:

Onus probandi actori incumbit — the burden of proof rests upon the claimant.

This means that a person who asserts a legal right normally has to establish the facts creating that right.

Example

A says:

“B owes me AED 500,000.”

A cannot normally obtain judgment merely by making the statement.

A should provide appropriate evidence, such as:

contract;

acknowledgment;

bank records;

invoices;

correspondence;

electronic communications;

witness evidence where legally permissible;

expert evidence where technical issues arise.

The court then evaluates the evidence.

4. Claimant and Defendant Have Different Evidentiary Roles

The UAE system does not mean that only the claimant ever produces evidence.

The general structure is:

For example, if the claimant proves that AED 1 million was advanced under a loan agreement and the defendant says:

“I already repaid the money.”

The defendant's affirmative assertion of repayment normally requires supporting evidence.

5. Burden of Proof and Legal Presumptions

Not every fact has to be proved from the beginning.

The law may establish a presumption.

A presumption means that the court starts from an assumed factual position until sufficient evidence establishes otherwise.

Therefore:

Ordinary fact → party asserting it must prove it

but:

Presumed fact → opposing party may have the burden of rebutting the presumption

This is particularly important in disputes concerning:

ownership;

payment;

possession;

authenticity;

contractual obligations;

corporate transactions;

electronic records.

6. Burden of Proof vs. Burden of Producing Evidence

These concepts should be distinguished.

A. Burden of proof

This is the ultimate responsibility for establishing the necessary facts.

B. Evidentiary burden

This is the practical obligation to produce sufficient evidence in response to the evidence already presented.

For example:

A proves a written loan agreement.

B initially denies the loan.

Once the agreement is properly established, B may need to produce evidence supporting an assertion such as:

“The debt has already been paid.”

Thus the evidentiary position can change during litigation even though the fundamental burden of proving the original claim remains important.

7. Relevance and Admissibility of Evidence

A party cannot simply produce unlimited information.

Under Article 1 of the Evidence Law, facts to be proved must be:

relevant to the dispute;

connected with the evidentiary issue; and

legally admissible. (UAE Legislation)

Therefore:

Relevant + Material + Admissible Evidence = Evidence capable of supporting the claim

For example, in a breach-of-contract case, evidence concerning an unrelated transaction between the parties may have little or no evidentiary value.

8. Court Cannot Decide Merely on Personal Knowledge

An important principle is that the judge should decide on the basis of the evidence and material properly placed before the court, rather than private personal knowledge.

Article 1 of the Evidence Law expressly provides that a judge shall not render judgment based upon personal knowledge. (UAE Legislation)

This protects:

procedural fairness;

equality of parties;

right of defence;

transparency of adjudication.

The parties must have an opportunity to address the material evidence relied upon in determining the dispute.

9. Standard Forms of Evidence

The UAE Evidence Law recognizes various forms of proof, including:

1. Documentary evidence

Contracts, invoices, acknowledgments, official documents and other writings.

2. Electronic evidence

Emails, electronic records, electronic communications and other electronic material.

3. Testimony

Witness evidence, subject to statutory restrictions.

4. Admission

A party may acknowledge a fact against its own interest.

5. Oath

The oath can become important where the statutory requirements for oath-based proof are satisfied.

6. Expert evidence

Used where the dispute involves technical, accounting, engineering, valuation or other specialized questions.

7. Judicial inspection

The court may examine relevant objects, locations or conditions.

8. Presumptions

The law or circumstances may permit one fact to be inferred from another.

10. Documentary Evidence and the Burden of Proof

Written documents are particularly important in UAE commercial litigation.

Suppose A claims:

“B agreed to purchase goods worth AED 800,000.”

A written contract may establish:

identity of parties;

contractual obligations;

price;

delivery requirements;

payment terms;

dispute-resolution provisions.

The claimant's burden becomes considerably easier when reliable documentary evidence establishes the transaction.

However, the existence of a document does not automatically resolve every issue.

The court may still consider:

authenticity;

authority of the signatory;

interpretation;

subsequent amendments;

performance;

payment;

termination;

fraud or forgery.

11. Electronic Evidence and Burden of Proof

Modern UAE litigation increasingly involves:

WhatsApp messages;

emails;

electronic contracts;

digital signatures;

electronic invoices;

blockchain records;

online payment records;

platform records.

The Evidence Law specifically regulates electronic evidence.

This means that a party relying on electronic material should be able to establish, where disputed:

Authenticity + Attribution + Integrity + Relevance

For example, a WhatsApp screenshot may be relevant, but the court may need to consider whether:

the account belonged to the alleged sender;

the message was actually sent by that person;

the message was altered;

the surrounding conversation changes its meaning.

12. Admission and Burden of Proof

An admission can substantially alter the evidentiary position.

For example:

A claims:

“B received AED 200,000.”

B states:

“Yes, I received AED 200,000, but I subsequently returned it.”

The admission may remove one factual dispute — receipt of the money — while leaving another dispute concerning repayment.

The UAE Evidence Law distinguishes proof generally applicable against parties from an admission, which operates as affirmative evidence against the person making it.

13. Defendant's Denial and Oath

The UAE system also recognizes the role of the oath.

The basic structure is:

Claimant proves; defendant denies and, where legally applicable, may be required or permitted to take an oath.

The oath is not simply a substitute for all documentary or other evidence. Its operation depends upon the circumstances and statutory provisions governing the particular type of oath.

Therefore, a defendant cannot necessarily defeat a well-supported claim merely by making an unsupported denial.

14. Burden in Contractual Disputes

In a contractual dispute, the claimant normally has to establish the elements necessary for relief.

For example:

Claim for breach

The claimant may need to establish:

existence of a valid contract;

relevant contractual obligation;

due date/performance requirement;

breach;

damage, where damages are claimed; and

causation.

The defendant may then establish:

performance;

payment;

contractual termination;

force majeure;

impossibility;

limitation;

waiver;

absence of damage;

absence of causation;

another contractual or statutory defence.

Formula

Contract + Obligation + Breach + Damage + Causation = Potential Contractual Liability

15. Burden in Tort/Civil Wrong Claims

In civil liability claims, the claimant generally needs to establish the factual foundation for liability.

A typical structure is:

Wrongful Act/Fault + Damage + Causation = Civil Liability

For example, if A claims that B's negligent conduct damaged A's property, A should establish:

B's relevant conduct;

unlawfulness/fault where required;

actual damage;

causal connection.

The defendant may respond by establishing:

absence of fault;

absence of damage;

intervening cause;

contributory circumstances;

force majeure or another legally recognized defence.

16. Burden of Proof in Damages

Proof of liability does not automatically establish the amount of damages.

A claimant may establish:

“B breached the contract.”

But the claimant may still have to establish:

“The breach caused AED 5 million in recoverable damage.”

This distinction is very important.

Courts generally examine:

actual loss;

causation;

foreseeability where applicable;

lost profits where legally recoverable and sufficiently established;

loss of opportunity where sufficiently proven;

mitigation;

expert valuation.

A speculative calculation is weaker than reliable documentary or expert evidence.

17. Role of Expert Evidence

Experts are frequently used in complex UAE civil and commercial cases.

Examples include:

construction disputes;

accounting disputes;

banking disputes;

valuation disputes;

engineering disputes;

insurance claims;

technical damages;

cryptocurrency disputes.

However, an expert generally assists the court with technical questions.

The final legal determination remains for the court.

Thus:

Expert determines/assists with technical matters → Court determines legal rights and liability.

18. Six Important UAE Case Laws

The following cases illustrate important principles concerning burden, evidence, evaluation of proof and judicial reasoning. Some are not exclusively “burden of proof” cases but are highly relevant to the operation of evidentiary burdens.

Case 1 — Dubai Court of Cassation, Civil Cassation No. 647 of 2021

Principle

The court must demonstrate that it has understood and evaluated the material evidence and arguments capable of affecting the result.

Importance

A party does not satisfy its evidentiary responsibility merely by filing documents. The evidence must be relevant and capable of proving the asserted fact.

The judgment must also address material evidence and substantial defences where they could change the outcome.

Lesson

Material evidence + proper judicial evaluation = sound determination of burden of proof.

Case 2 — Dubai Court of Cassation, Civil Cassation No. 79 of 2020

Principle

A clear and certain admission can have binding evidentiary consequences against the person making it.

Importance

An admission may remove the need for the opposing party to prove a fact that has already been clearly admitted.

For example:

“I received the money.”

The dispute may then shift from receipt to repayment, purpose, or legal characterization.

Lesson

Clear admission can shift the factual focus of the dispute.

Case 3 — Dubai Court of Cassation, Civil Cassation No. 880 of 2021

Principle

Compensation may include proven present or future damage and, in appropriate circumstances, loss of opportunity, provided the damage is sufficiently established.

Importance

The case illustrates that proving breach or wrongful conduct is not enough.

The claimant must also establish the actual legally recoverable consequences.

Lesson

Proof of liability ≠ automatic proof of damages.

The claimant must separately establish the loss and causal connection.

Case 4 — Dubai Commercial Cassation No. 767 of 2021

Principle

Technical experts may assist the court with technical matters, but questions of law remain for the court.

Importance

A party cannot transfer its ultimate burden of proving a legal entitlement to an expert.

For example, an accountant may calculate an amount, but the court decides whether that amount is legally recoverable.

Lesson

Expert evidence supports proof; it does not replace judicial determination of law.

Case 5 — Dubai Commercial Cassation Nos. 1012 and 1023 of 2022

Principle

Technical expertise cannot substitute for the court's legal determination.

Importance

These decisions reinforce the distinction between:

technical/factual assessment; and

legal characterization.

For example, an expert may determine whether construction work was defective, calculate quantities or assess costs. Whether those facts constitute a legally actionable breach remains a judicial question.

Lesson

Technical proof does not automatically prove legal liability.

Case 6 — Federal Supreme Court, Civil Case No. 99, Judicial Year 16, judgment of 17 December 1995

Principle

In civil liability arising from a harmful act, the court considers the wrongful conduct, damage and causal relationship, together with circumstances that may interrupt or affect causation.

The decision also reflected traditional UAE civil-law principles concerning removal of harm.

Importance

The case demonstrates that a claimant must establish the factual elements necessary for civil liability rather than merely alleging that harm occurred.

Lesson

Harm must be connected to the legally relevant conduct.

Case 7 — Dubai Court of Cassation, Civil Cassation No. 468 of 2024

Principle

Electronic communications, including WhatsApp communications, may have evidentiary significance when their authenticity and attribution are sufficiently established.

Importance

The case is particularly relevant to the modern burden of proof because a claimant relying on digital communications must establish their connection with the alleged transaction.

Lesson

Digital evidence can satisfy evidentiary requirements, but authenticity and attribution remain important.

Case 8 — Dubai Court of Cassation, Case No. 277 of 2009

Principle

Electronic communications and records may have evidentiary significance where they can be reliably connected to the relevant party and transaction.

Importance

This illustrates the transition from traditional paper evidence to electronic proof.

Lesson

The form of evidence may change, but the need to establish reliability remains.

19. Conflicting Evidence

Sometimes both parties produce evidence pointing in different directions.

The Evidence Law provides a mechanism for dealing with conflicting evidence. Where evidence cannot be reconciled, the court may evaluate its relative strength by drawing reasonable inferences from the facts; if the conflict cannot be resolved, the court may decline to rely on the conflicting evidence and must explain the basis of its decision. (UAE Legislation)

Therefore:

More documents ≠ automatically stronger case.

The court considers:

authenticity;

consistency;

relevance;

reliability;

surrounding circumstances;

admissions;

expert findings;

witness evidence;

contractual documents.

20. Burden of Proof and Documents Held by the Opponent

A party may sometimes require a document held by the opposing party.

The UAE Evidence Law permits court-directed production in specified circumstances, including where the document is shared between the parties or the opposing party relies upon it.

Therefore, the system does not simply say:

“If you do not possess the document, you can never prove the fact.”

The court has mechanisms for obtaining relevant documentary material in appropriate circumstances.

21. Burden of Proof and Digital/Blockchain Disputes

This principle becomes particularly important in modern disputes involving:

cryptocurrency;

NFTs;

smart contracts;

blockchain transactions;

digital wallets;

electronic signatures;

online platforms.

Suppose A claims:

“B transferred 10 BTC to my wallet.”

A may need to establish:

existence of the blockchain transaction;

relevant wallet addresses;

connection between the wallet and B;

authenticity of the records;

contractual or legal basis of the claim;

amount/value;

damage or entitlement.

A blockchain record may strongly establish transaction chronology and data integrity, but it does not automatically establish every legal question, such as:

who controlled the wallet;

why the transfer occurred;

whether there was contractual consent;

whether the transfer was fraudulent;

whether ownership was transferred;

what remedy follows.

22. Burden of Proof and Judicial Discretion

The UAE judge has an important role in evaluating evidence.

However, judicial discretion is not unlimited.

The court should:

rely on admissible material;

consider material evidence;

provide adequate reasoning;

avoid deciding on personal knowledge;

distinguish facts from legal conclusions;

address material defences.

This is why the case law concerning judicial reasoning is closely connected with burden of proof.

23. Important Distinction: Burden of Proof vs. Standard of Proof

These are different concepts.

Burden of proof

Who must prove?

Standard/strength of proof

How convincingly must the fact be established under the applicable legal rule?

For example:

A claimant may bear the burden of establishing a contractual debt, but the court assesses whether the documentary, electronic, admission, witness or other evidence is legally sufficient.

Thus:

Burden = responsibility

Evidence = means

Judicial evaluation = assessment

Judgment = legal consequence

24. Practical Example

Assume:

A company claims AED 2 million from B for defective construction.

Step 1 — Claim

A alleges that B breached the construction contract.

Step 2 — Initial burden

A should establish:

contract;

contractual specifications;

B's obligation;

defect;

breach;

resulting damage.

Step 3 — Evidence

A produces:

contract;

invoices;

photographs;

inspection reports;

correspondence;

expert report.

Step 4 — Defendant's response

B argues:

work complied with specifications;

defects resulted from A's later modifications;

damage was caused by another contractor;

A failed to mitigate.

Step 5 — Expert evidence

An engineering expert may determine:

existence of defects;

technical cause;

repair cost;

percentage of responsibility.

Step 6 — Judicial decision

The court decides:

whether there was breach;

whether the defect caused the damage;

whether the defence is established;

what compensation is legally recoverable.

This demonstrates the movement of evidentiary responsibility during litigation.

25. Key Principles in Simple Form

26. Short Formula for UAE Burden of Proof

General Rule

Claimant's Assertion → Claimant's Evidence → Defendant's Defence → Counter-Evidence → Judicial Evaluation → Judgment

For civil liability:

Wrongful Conduct + Damage + Causation + Proof = Liability

For contractual liability:

Contract + Obligation + Breach + Damage/Causation + Proof = Contractual Remedy

27. Conclusion

The UAE burden-of-proof system is fundamentally based on the principle that the claimant must establish the facts necessary to support the claim, while the defendant may disprove those facts and establish affirmative defences.

The most important principles are:

The claimant carries the primary burden.

The defendant has the right to challenge the claim.

A party relying on an affirmative defence must generally establish the factual basis of that defence.

Evidence must be relevant and admissible.

Admissions can significantly affect the evidentiary position.

Electronic evidence is legally recognized.

Expert evidence assists with technical questions but does not determine legal liability.

Proof of liability is distinct from proof of damages.

Courts must evaluate material evidence and substantial defences.

The ultimate decision must be based on the evidence and law, not the judge's personal knowledge.

In short:

In UAE civil litigation, the party asserting a right generally bears the burden of establishing the facts that create that right; the opposing party may defeat the claim by disproving those facts or establishing a legally recognized defence.

The core statutory foundation is Federal Decree-Law No. 35 of 2022, particularly its general provisions on the claimant's right to prove, the defendant's right to disprove, and the allocation of the onus of proof. (UAE Legislation)

Note: UAE Court of Cassation and Federal Supreme Court decisions are important judicial authorities for interpretation and application, but the UAE does not operate on the same doctrine of binding common-law precedent as England and Wales.