The ESPD (European Single Procurement Document) is a standardised self-declaration form that suppliers submit to confirm they meet a tender's eligibility and selection criteria. It lets bidders declare compliance up front instead of providing all supporting evidence at bid time.
Using the ESPD, a supplier states that it is not subject to exclusion grounds (such as unpaid taxes or serious misconduct) and that it meets the financial, technical, and professional requirements. Full evidence is usually only required from the winning bidder, which reduces paperwork for everyone else.