An e-invoice is an invoice that has been issued, transmitted and received in a structured electronic format that enables it to be processed automatically and electronically, as defined in paragraph 1 of Article 2 of Directive 2014/55/EU of the European Parliament and of the Council of 16 April 2014 on electronic invoicing in public procurement.

Public Administration suppliers, as co-contractors, are obliged to issue e-invoices when executing public contracts, as established in Part III of the CCP, article 299-B.

Although the presence of the original PDF of the invoice is not mandatory according to the CIUS-PT standard, a large number of public bodies impose this obligation to facilitate the validation and digital archiving of invoices. To avoid delays and payment obstacles, we recommend that the original PDF always accompanies the electronic invoice.