DAS Explained: How ECA Audits the EU Budget Every Year

What it is: background and legal basis

The Declaration of Assurance (DAS) is a cornerstone of the European Union's audit framework. It represents the European Court of Auditors’ (ECA) opinion on the reliability of the EU’s accounts and the legality and regularity of the underlying transactions. This opinion, required by Article 287 of the Treaty on the Functioning of the European Union (TFEU), is a vital element of the EU's accountability process, informing the European Parliament and the Council on how EU funds have been managed. It’s a critical topic for all EU audit practitioners, particularly those preparing for the EPSO AD7 Auditors competition.

The legal basis for the DAS is firmly rooted in the TFEU. Article 287 mandates the ECA to provide the European Parliament and the Council with a statement of assurance as to the reliability of the accounts and the legality and regularity of the underlying transactions. This statement is delivered annually through the ECA's Annual Report. The ECA conducts its audits in accordance with internationally accepted auditing standards (ISA) and its own auditing standards, which are largely based on International Standards on Auditing (ISAs) adapted to the EU context.

The European Court of Auditors (ECA), as the EU's independent external auditor, is responsible for providing this declaration of assurance. This responsibility is critical to ensuring the sound financial management of the EU budget and the protection of taxpayers' money.

How it works in practice

The ECA's DAS focuses on two core components:

• Reliability of accounts: This assesses whether the EU's consolidated accounts accurately present the financial position, results of operations, and cash flows. The reliability opinion is based on audit evidence gathered to support that the information presented in the accounts is free from material misstatement, fairly presented and in accordance with applicable accounting rules and principles, primarily IPSAS (International Public Sector Accounting Standards) adapted to the EU context.
• Legality and regularity of transactions: This examines whether the transactions underlying the accounts comply with the applicable laws, regulations, and contractual provisions. This is where the ECA often encounters difficulties, particularly in areas like Cohesion and Agriculture. The opinion on the legality and regularity of underlying transactions is based on audit evidence gathered to support whether expenditure and revenue comply with the relevant legal and regulatory framework applicable to the EU Budget.

The ECA issues one of three types of opinions:

• Positive (Unqualified) Opinion: This signifies that the ECA has obtained sufficient appropriate audit evidence to conclude that the accounts are reliable and that the underlying transactions are legal and regular in all material respects. A fully positive DAS has never been issued on the legality and regularity of payments.
• Qualified Opinion: This indicates that the ECA has identified specific instances of material misstatement or non-compliance, but these are not pervasive enough to warrant an adverse opinion. The report will specify areas of disagreement.
• Adverse Opinion: This is issued when the ECA concludes that the accounts are materially misstated or that the underlying transactions are materially non-compliant with the applicable rules and regulations. This is the most severe opinion, signifying significant problems with the EU's financial management.

The table below summarises the potential opinions the ECA can issue regarding reliability of accounts and legality/regularity of transactions:

How the ECA samples transactions: The ECA uses statistical sampling techniques to select transactions for audit. These samples are designed to be representative of the overall population of transactions and allow the ECA to extrapolate its findings to the entire EU budget. Sampling methodologies take into account the size and nature of the population, the level of assurance required, and the inherent risks associated with the different areas of expenditure. Common sampling methods include random sampling, stratified sampling, and monetary unit sampling.

Materiality Threshold: The ECA operates under a materiality threshold of 2%. This means that the ECA considers errors or irregularities below this threshold to be immaterial and unlikely to significantly impact its overall opinion. However, the ECA also considers qualitative factors when assessing materiality, such as the nature and cause of the errors or irregularities. Where material errors are detected, the ECA will quantify these errors and include them in its Annual Report.

Annual Report Structure: The ECA's Annual Report typically includes:

• An overview of the EU budget and financial management.
• The Statement of Assurance (DAS) on the reliability of the accounts and the legality and regularity of transactions.
• Specific chapters on different areas of EU expenditure (e.g., Agriculture, Cohesion, Research).
• Audit findings, conclusions, and recommendations.
• Follow-up on previous years' recommendations.

Statement of Assurance (SAR): Within the Annual Report, the Statement of Assurance (SAR) is the core deliverable. It presents the ECA's overall opinion, summarises the audit findings, and highlights the key areas of concern. The SAR is addressed to the European Parliament and the Council, providing them with the information needed to hold the Commission accountable for its financial management.

The ECA findings directly inform the discharge procedure, a process where the European Parliament decides whether to approve the Commission's handling of the EU budget. A negative DAS or significant findings of irregularity can lead to the Parliament refusing to grant discharge, forcing the Commission to take corrective action. More information on the discharge procedure can be found here.

The DAS also complements the Commission's own reporting on financial management. The Annual Management and Performance Report (AMPR), prepared by the Commission, presents an overview of the EU budget's performance and the effectiveness of internal control systems. The ECA's DAS provides an independent assessment of the Commission's reporting, adding credibility and ensuring accountability.

The most common points of confusion

• The difference between legality/regularity and performance: The DAS focuses on whether transactions comply with the rules, not whether the funds were spent effectively to achieve their intended objectives. Performance audits assess the latter.
• The concept of materiality: The 2% threshold is a rule of thumb, not a rigid limit. The ECA considers both quantitative and qualitative factors when assessing the materiality of errors.
• The roles of the ECA and the Commission: The Commission is responsible for managing the EU budget, while the ECA is responsible for auditing it. The ECA provides an independent assessment of the Commission's management.

Why it matters for EU auditors

Understanding the ECA's Declaration of Assurance is essential for EU auditors because it shapes the audit approach and the interpretation of audit findings. As an EU auditor, you need to understand the legal basis for the DAS, the methodology used by the ECA, and the implications of the different types of opinions. This knowledge is critical for planning and conducting effective audits and for communicating audit results to stakeholders. The DAS is a frequent topic in the EPSO AD7 Auditors exam, so make sure you grasp the key concepts. Prep for AD7 Auditors on Prep4EU

Related guides

• European Court of Auditors Explained
• ISSAI IIA Standards EU Auditors
• EU Financial Regulation Auditors Guide