Certificates and Attestations

Certificates and attestations are the formal documentary backbone of supplier qualification in European public procurement. While the ESPD and self-declaration systems allow suppliers to defer their submission to the award stage, contracts are ultimately awarded only after the winning tenderer produces these documents as means of proof. Understanding the full landscape of certificate types and their sources is essential for efficient bid management.

What are certificates and attestations?

The terms "certificate" and "attestation" are used interchangeably in EU procurement law to describe any official document that confirms a fact about a supplier. They fall into several functional categories.

Legal status certificates. These confirm that a supplier is legitimately constituted and has no grounds for mandatory exclusion. The criminal record certificate is the primary example for individuals and companies. Registration extracts from national commercial registers confirm legal incorporation and existence.

Compliance certificates. These confirm that a supplier is meeting its obligations to public authorities. The tax compliance certificate confirms no outstanding tax debts. The social security compliance certificate confirms that contributions for employees are current. Both are typically issued by national tax and social insurance authorities.

Professional and trade certificates. These confirm membership of a professional body, a trade register, or a regulatory framework necessary for the type of work being procured. The professional competence certificate is the most common example.

Quality and management system certificates. Third-party accredited certifications that confirm a supplier operates to recognised quality, environmental, or information security management standards. These include quality management certificates, environmental management certificates, and information security certificates.

Experience attestations. References and certificates of satisfactory execution from previous clients, confirming that the supplier has successfully delivered comparable contracts. These are typically issued by the client, not by a public authority.

Article 60 of Directive 2014/24/EU defines the means of proof accepted for each selection criterion category. Annex XII of the same directive lists specifically the documents contracting authorities may request. The eCertis database maps national equivalents to the Annex XII document types.

Why certificates and attestations matter for bidders

Certificate management is a continuous operational task for active procurement teams. Many certificates have fixed validity periods (criminal records in France are valid for three months; tax clearance letters in Ireland are typically valid for four to six weeks), and a certificate that was current at self-declaration stage may have expired by the time the contracting authority requests it at award stage.

Maintaining a certificate register with renewal dates, responsible owner, and issuing authority contact prevents the common scenario of a contract award being delayed or lost because an expired certificate cannot be quickly replaced.

Example

A Hungarian engineering consultancy is shortlisted for a Norwegian framework (Norway participates in EU procurement rules through the EEA agreement). The Norwegian authority requests means of proof within fifteen days. The consultancy submits: a certificate of no criminal convictions from the Hungarian court registry, a tax clearance from the National Tax and Customs Administration, a social security certificate from the National Insurance Fund, and a current ISO 9001 certificate from its accredited certification body. All are within their validity periods.

Frequently Asked Questions

How do I know which certificates a specific contracting authority will accept?

The tender documents and ESPD Request specify which criteria apply. The eCertis database then identifies the national equivalent document for each criterion in your home country. If the mapping is unclear, raise a clarification question through the official channel during the procurement.

Can certificates be submitted electronically?

Increasingly yes. Many EU member states are integrating their certificate registries with e-procurement systems, allowing contracting authorities to retrieve documents directly without the supplier needing to obtain and transmit a paper copy. Check the contracting authority's instructions and the national platform's capabilities for the specific procedure.

Do certificates need to be translated?

Most contracting authorities require documents in the official language of their country or in English. If your certificates are in another language, you may need to provide a certified translation. Clarify this requirement with the contracting authority before the award stage to avoid delays.