Civil Law and UAE Sources of Law in the UAE Private Law System

1. Introduction

The UAE private-law system is fundamentally a codified civil-law system. Its rules are primarily found in federal legislation, supplemented by principles derived from Islamic Sharia, custom, judicial interpretation, and, where the statutory framework permits, principles of justice and natural law.

The central modern statute for general private law is the Civil Transactions Law, currently contained in Federal Decree-Law No. 25 of 2025, which entered into force on 1 June 2026. It replaced the previous Federal Law No. 5 of 1985 framework.

The UAE system should not, however, be described simply as a purely statutory system. Courts play an important role in interpreting legislation, and judgments of the Federal Supreme Court and Emirate-level Courts of Cassation have significant jurisprudential importance.

The basic structure can be represented as:

Constitution and legislation
↓
Civil Transactions Law and special private-law statutes
↓
Sharia principles where the statutory methodology requires them
↓
Custom (urf)
↓
Principles of natural law and justice where applicable
↓
Judicial interpretation and jurisprudence

The precise hierarchy depends upon the particular legal question and the relevant legislation.

2. What Are “Sources of Law”?

A source of law means the legal foundation from which a court derives the rule applicable to a dispute.

In UAE private law, sources can broadly be divided into:

Primary legislative sources

• Constitution;
• federal laws and decrees;
• Federal Decree-Laws;
• regulations and implementing legislation;
• Emirate-level legislation within the relevant constitutional competence.

Supplementary sources recognised by civil legislation

• Islamic Sharia principles;
• custom (urf);
• principles of natural law;
• principles of justice.

Jurisprudential sources

• Federal Supreme Court judgments;
• Court of Cassation judgments;
• established judicial principles and interpretations.

Contractual sources

• agreements between parties, subject to mandatory law;
• established commercial practices and contractual customs.

The important point is that not every one of these sources has the same legal status.

3. Constitutional Foundation

The UAE Constitution establishes the country's federal legal structure and determines the relationship between federal and local authorities.

It also establishes the judiciary and the Federal Supreme Court.

The constitutional structure is particularly important for private law because it determines:

• legislative competence;
• judicial competence;
• federal jurisdiction;
• Emirate jurisdiction;
• the relationship between federal legislation and local legislation.

The Constitution therefore provides the institutional foundation within which private-law rules operate.

4. Federal Legislation as the Principal Source

The most important source of UAE private law is legislation.

This includes statutes dealing with:

• civil transactions;
• commercial companies;
• commercial transactions;
• labour;
• consumer protection;
• evidence;
• arbitration;
• insolvency;
• intellectual property;
• data protection;
• real estate;
• banking and financial services.

The Civil Transactions Law supplies general principles, while special legislation regulates particular fields.

Example

A contractual dispute may involve:

• Civil Transactions Law;
• Commercial Companies Law;
• Evidence Law;
• Arbitration Law;
• specific banking legislation.

The court must determine which legislation governs the particular issue.

5. Civil Transactions Law

The Civil Transactions Law is the central general private-law statute.

The current law is Federal Decree-Law No. 25 of 2025, effective from 1 June 2026.

It deals with fundamental areas such as:

• obligations;
• contracts;
• property;
• ownership;
• possession;
• compensation;
• unjust enrichment;
• tortious liability;
• performance;
• termination;
• prescription;
• security interests;
• other civil-law relationships.

It therefore operates as a general legal framework unless a special statute provides otherwise.

6. Article 1 and the Hierarchy of Sources

Article 1 of the current Civil Transactions Law is particularly important for understanding UAE private-law methodology.

Where a legal provision applies expressly or implicitly, the court applies it.

Where legislation does not provide the answer, the statutory methodology moves to Islamic Sharia principles and then to custom and other supplementary principles according to the hierarchy established by the law.

The provision also emphasises that where the legislative text is definitive, there is no room for an independent judicial interpretation that contradicts the text.

This produces the fundamental principle:

A UAE civil court does not begin with judicial precedent. It begins with the applicable legal rule.

7. Islamic Sharia as a Source

Islamic Sharia occupies an important constitutional and legislative position in the UAE legal system.

However, its practical role in private-law adjudication must be understood through the statutory hierarchy.

The court does not simply disregard legislation and independently choose a Sharia rule.

Instead, the Civil Transactions Law provides a methodology for resorting to Sharia principles where the statutory conditions for doing so exist.

This is characteristic of the UAE's civil-law structure:

Codification + Sharia principles + judicial interpretation.

8. Custom — Urf

Custom is another recognised supplementary source.

A custom may become legally relevant where:

• legislation does not resolve the issue;
• the custom is established;
• it is sufficiently consistent;
• it does not conflict with mandatory law;
• it does not contradict public order or public morals.

Commercial customs can be particularly important.

Example

A particular industry may have an established practice concerning:

• delivery;
• inspection;
• notice;
• payment;
• acceptance;
• calculation of charges.

Where legislation and contract terms do not resolve an issue, established commercial practice may assist the court.

9. Natural Law and Principles of Justice

Where the statutory hierarchy reaches the relevant stage without providing an answer, principles of natural law and justice may become relevant.

These concepts provide a supplementary method for dealing with legal gaps.

They should not be misunderstood as giving judges unlimited discretion.

The court must remain within the legal methodology established by legislation.

10. Judicial Precedent as a Jurisprudential Source

The UAE does not generally follow the common-law doctrine of stare decisis.

Therefore:

A previous UAE judgment should not automatically be treated as an equivalent of a binding English or American precedent.

Nevertheless, judgments of:

• Federal Supreme Court;
• Dubai Court of Cassation;
• Abu Dhabi Court of Cassation;
• other competent Cassation courts

can be highly important for interpretation.

Repeated judicial principles can produce what may be called soft precedent.

Judicial decisions therefore operate primarily as interpretive jurisprudence, while legislation remains the fundamental source.

11. Case Law 1 — Federal Supreme Court Cassation No. 250 of 2020

Principle: Authority and finality of Federal Supreme Court judgments

In Federal Supreme Court Cassation No. 250 of 2020, the Court discussed the final and binding character of Federal Supreme Court judgments.

The Court connected judicial finality with:

• legal certainty;
• stability;
• termination of litigation;
• preventing endless challenges.

Importance as a source of law

The case illustrates an important distinction.

A Federal Supreme Court judgment has binding force in the relevant litigation and has substantial jurisprudential authority, but UAE law should not be reduced to the proposition that every judicial statement automatically becomes a universally binding common-law precedent.

The case therefore illustrates the jurisprudential authority of higher-court decisions within a codified system.

12. Case Law 2 — Federal Supreme Court Commercial Cassation No. 941 of 1987

Principle: Legal source determines the nature of liability

In this important banking dispute, the Federal Supreme Court distinguished between:

• contractual liability; and
• tortious liability.

The Court explained that solidarity requires a unity of source, whereas different legal sources can produce concurrent responsibility for the same loss.

Importance

This case demonstrates how courts use general statutory concepts to develop detailed legal principles.

It is therefore an example of judicial interpretation operating as a jurisprudential source.

The court did not create an entirely independent body of law. Instead, it interpreted the civil-law rules governing obligations and liability.

13. Case Law 3 — Federal Supreme Court Cassation No. 139 of 1996

Principle: Statutory liability of general partners

The Federal Supreme Court considered the liability of partners in a general partnership.

The Court recognised that partners may have personal and solidary responsibility for partnership obligations under the applicable company-law rules.

Importance

The case illustrates the relationship between:

legislation → legal personality → partner liability → judicial interpretation.

The court's role was principally to interpret and apply the statutory rules governing partnerships.

It demonstrates why UAE private law cannot be understood solely through judicial decisions: the underlying legal obligation is created by legislation.

14. Case Law 4 — Dubai Court of Cassation, Commercial Cassation No. 99 of 2023

Principle: Contractual obligation and solidarity

The Dubai Court of Cassation reaffirmed that solidarity is not presumed and must have a legal or contractual basis.

The Court also emphasised the principle that a contract ordinarily binds its parties and cannot automatically impose contractual obligations upon a person who is not a contracting party.

Importance

This case demonstrates two fundamental UAE private-law principles:

1. legislation establishes the legal framework;
2. the court interprets that framework through jurisprudence.

It is therefore an example of judicial decisions functioning as an interpretive source without replacing legislation.

15. Case Law 5 — Dubai Court of Cassation, Commercial Cassation No. 1 of 2024

Principle: Correct legal characterization

The Court considered the legal character of obligations arising from a multi-party transaction.

It reaffirmed that the existence of several persons connected with the same transaction does not automatically mean that they have identical legal obligations.

The court must identify:

• the legal source;
• contractual relationships;
• statutory obligations;
• factual circumstances;
• the applicable legal rule.

Importance

This illustrates a major function of judicial jurisprudence:

Judicial decisions convert broad statutory concepts into practical legal tests.

16. Case Law 6 — Dubai Court of Cassation, Civil Cassation No. 53 of 2026

Principle: Separate legal personality of companies

In this recent case, the Court examined whether managers of a limited liability company could automatically be made personally responsible for the company's contractual obligations.

The Court maintained the distinction between:

• the company as a legal person; and
• its managers acting in their representative capacity.

Personal responsibility requires a legally recognised basis such as fraud, abuse, unlawful conduct or another applicable rule.

Importance

The case demonstrates how UAE courts use legislation concerning:

• companies;
• legal personality;
• agency;
• contractual obligations

to determine the liability of individuals.

The case therefore illustrates the interaction between statutory law and judicial interpretation.

17. Case Law 7 — Federal Supreme Court Civil Cassation No. 647 of 2021

Principle: Duty to give adequate reasons

The Federal Supreme Court has repeatedly emphasised that judicial decisions must contain sufficient reasoning and address material arguments and evidence capable of affecting the result.

Importance

This is a procedural manifestation of jurisprudence as a source.

Although the underlying obligation to give reasons comes from legislation and procedural law, judicial decisions clarify:

• what constitutes adequate reasoning;
• when failure to address a defence constitutes a defect;
• how evidence should be considered;
• when a judgment becomes vulnerable on cassation.

Thus, jurisprudence gives operational meaning to broad legislative requirements.

18. Case Law 8 — Federal Supreme Court Civil Cassation No. 79 of 2020

Principle: Material defences and judicial reasoning

The Federal Supreme Court addressed the treatment of admissions, evidence and material defences.

The Court emphasised that a court must deal with defences capable of affecting the outcome rather than simply ignoring them.

Importance

This illustrates how judicial decisions contribute to the development of procedural and evidentiary standards.

The legislation establishes the general obligation; jurisprudence clarifies its practical application.

19. Legislation vs Judicial Decisions

The relationship can be represented as follows:

20. Mandatory Law vs Dispositive Law

Another important aspect of UAE private law is the distinction between:

Mandatory rules

Parties cannot contract out of them.

Examples may involve:

• public order;
• consumer protection;
• certain company rules;
• statutory employment protections;
• mandatory procedural rules.

Dispositive rules

Parties may be able to modify their relationship by agreement.

This is particularly important in contract law.

Therefore:

A contract itself can become a source of obligations, but it is not superior to mandatory legislation.

21. Contract as a Source of Private Obligations

The principle of freedom of contract is important in UAE civil law.

Parties can generally:

• create contractual obligations;
• allocate risks;
• establish payment mechanisms;
• determine performance procedures;
• establish termination mechanisms;
• allocate certain liabilities.

However, contractual freedom is limited by:

• mandatory law;
• public order;
• public morals;
• good faith;
• statutory restrictions.

Therefore, contract operates as a private source of obligations within the boundaries of legislation.

22. Good Faith as a Legal Principle

Good faith is an important principle in UAE private law.

It can influence:

• performance of contracts;
• interpretation;
• exercise of rights;
• contractual cooperation;
• prevention of abusive conduct.

However, good faith does not normally permit a court to disregard clear mandatory legislation.

It functions within the statutory structure.

23. Public Order

Public order (ordre public) imposes another important limitation.

An agreement cannot simply become enforceable because both parties consented to it.

If the agreement violates a mandatory rule or public order, the court may refuse to give effect to the offending provision.

Thus:

Contractual autonomy

↓

Subject to mandatory legislation and public order

24. Commercial Custom as a Source

Commercial practice is especially important in sophisticated transactions.

For example, in:

• banking;
• construction;
• shipping;
• insurance;
• commodity trading;
• international trade,

parties may operate according to established industry practices.

The court can consider commercial custom where the statutory requirements for doing so are satisfied.

But custom cannot override:

• mandatory legislation;
• public order;
• express contractual provisions where the law gives those provisions priority.

25. International Treaties

International treaties and conventions to which the UAE is a party can also form part of the applicable legal framework after incorporation according to the UAE constitutional system.

This is especially important in private-law areas such as:

• international commercial arbitration;
• recognition and enforcement of arbitral awards;
• international trade;
• carriage;
• intellectual property;
• international commercial relationships.

Where a treaty applies to a dispute, the court must consider the treaty alongside domestic legislation.

26. Arbitration as a Special Private-Law Framework

Arbitration demonstrates the interaction between different sources particularly well.

A dispute may involve:

• Civil Transactions Law;
• Arbitration Law;
• contractual arbitration agreement;
• institutional rules;
• applicable international convention.

For example, an arbitration agreement derives its authority from:

contract + arbitration legislation + applicable procedural rules.

Thus, UAE private law frequently operates through overlapping sources.

27. Federal and Emirate-Level Legislation

The UAE is a federation.

Consequently, researchers must determine whether a particular issue falls within:

• federal legislative competence; or
• Emirate-level competence.

This is particularly important in:

• property;
• tenancy;
• commercial licensing;
• local economic regulation;
• court organisation;
• municipal regulation.

For example, Dubai has its own legislation governing various real-estate and tenancy matters.

Therefore:

“UAE law” does not always mean that one identical rule applies in every Emirate.

The jurisdiction and subject matter must be identified first.

28. DIFC and ADGM

The DIFC and ADGM require special attention.

They operate with distinct legal frameworks, including significant common-law influence in their courts and commercial regulations.

Therefore, a researcher should not automatically assume:

Onshore UAE civil-law jurisprudence = DIFC/ADGM law.

A dispute in the DIFC may require analysis of:

• DIFC legislation;
• DIFC Court decisions;
• applicable common-law principles.

Similarly, ADGM disputes must be examined under the ADGM legal framework.

This creates a pluralistic private-law environment within the UAE.

29. Role of Court of Cassation

The Court of Cassation is important because it addresses legal errors and develops consistent interpretation.

Its decisions can clarify:

• meaning of statutory provisions;
• contractual interpretation;
• procedural rules;
• evidence;
• limitation;
• damages;
• jurisdiction;
• legal characterization.

However, this should be described as jurisprudential authority or soft precedent, rather than automatically equating it with common-law stare decisis.

30. Soft Precedent

Repeated judicial reasoning can create a practical hierarchy:

First level

Statutory text.

Second level

Established interpretation of that text.

Third level

Repeated Cassation principles.

Fourth level

Application of those principles to new facts.

This produces legal predictability while preserving the civil-law character of the UAE system.

31. Why Judicial Interpretation Matters

Legislation often uses general concepts such as:

• good faith;
• reasonable compensation;
• abuse of rights;
• material breach;
• causation;
• custom;
• public order;
• unjust enrichment.

Courts must apply these concepts to specific disputes.

Judicial decisions therefore provide practical content to general legislative language.

For example:

Statute: establishes a general rule concerning damages.

↓

Court: determines what evidence establishes causation.

↓

Later courts: use the established reasoning.

↓

Result: stable jurisprudential principle.

32. Role of Legal Scholarship

Legal scholarship is not generally equivalent to legislation or binding judicial authority.

However, academic commentary can be important in:

• explaining legislation;
• identifying conflicting interpretations;
• analysing judicial trends;
• comparing UAE law with other civil-law systems;
• assisting lawyers and judges in understanding complex questions.

It is therefore best described as a persuasive intellectual source, rather than a primary source of binding law.

33. Hierarchy for Solving a Private-Law Problem

A UAE lawyer analysing a civil dispute should generally proceed in this order:

Step 1 — Identify jurisdiction

Is the dispute:

• federal;
• Dubai;
• Abu Dhabi;
• another Emirate;
• DIFC;
• ADGM?

Step 2 — Identify the legal relationship

Is it:

• contract;
• tort;
• property;
• company;
• insurance;
• employment;
• consumer;
• banking?

Step 3 — Find special legislation

A specific statute may displace the general rule.

Step 4 — Apply the Civil Transactions Law

Use the general civil-law framework where applicable.

Step 5 — Examine Article 1's supplementary methodology

Consider the relevant supplementary source where legislation does not resolve the matter.

Step 6 — Examine jurisprudence

Search Federal Supreme Court and relevant Court of Cassation principles.

Step 7 — Examine contract and custom

Determine whether the parties' agreement or established practice affects the issue.

Step 8 — Apply the facts

Only after identifying the applicable legal framework should the court determine the result.

34. Sources of Law — Simple Diagram

              UAE PRIVATE LAW                    │          ┌─────────┴─────────┐          │                   │    Constitutional       Legislative      Framework             Sources          │                   │          │          ┌────────┴────────┐          │          │                 │       Constitution  General        Special                     legislation    legislation                         │                Civil Transactions Law                         │          ┌──────────────┼──────────────┐          │              │              │       Sharia          Custom       Justice/       principles       (Urf)       Natural Law          │              │              │          └──────────────┼──────────────┘                         │                  Judicial Interpretation                         │                Federal Supreme Court                  Courts of Cassation                         │                   Soft Precedent

35. Importance of the Current 2026 Position

The entry into force of Federal Decree-Law No. 25 of 2025 on 1 June 2026 makes it particularly important to distinguish between:

• jurisprudence developed under the former Civil Transactions Law; and
• jurisprudence interpreting the new Civil Transactions Law.

Older cases remain potentially valuable where:

1. the relevant statutory wording is substantially similar;
2. the underlying legal principle has not been changed;
3. the new law does not expressly alter the rule.

But a researcher must not assume that every earlier case remains authoritative after a legislative change.

36. Six Case Laws — Quick Revision

37. Key Differences from Common-Law Systems

The comparison should nevertheless be treated as a broad structural distinction; modern legal systems frequently borrow techniques from one another.

38. Conclusion

The sources of law in the UAE private-law system are best understood as a structured combination of codified legislation, constitutional principles, recognised supplementary sources and judicial jurisprudence.

The most important source is legislation, particularly the current Civil Transactions Law and special statutes governing specific areas. The Civil Transactions Law's methodology gives an important role to Islamic Sharia principles, custom, and principles of natural law and justice when the statutory conditions for resorting to them are satisfied.

Judicial decisions occupy a different but highly important position. Federal Supreme Court and Courts of Cassation judgments interpret legislation, resolve difficult legal questions and establish recurring jurisprudential principles. They therefore produce a form of soft precedent, although the UAE system should not simply be equated with common-law stare decisis.

The key formula is:

Constitutional framework + legislation + supplementary legal sources + contractual autonomy + judicial interpretation = UAE private-law system.

For examination purposes, the most important principle to remember is:

The UAE is fundamentally a codified civil-law jurisdiction in which legislation is the principal source of private law, while Sharia, custom, justice and judicial jurisprudence operate within the statutory framework to resolve, interpret and develop legal rules.