ISDOC (Document Information System) is the Electronic invoicing format, which was defined by the "Electronic Data Exchange Standards Working Group" of ICT Union.

October 16, 2008, the "Declaration of a common approach regarding electronic invoicing" in the CR was signed. It express the commitment of economic and ERP systems producers (signed by a total of 14 major companies in the market) to build a common invoicing format and one year after publication to implement it to their commercial solutions. Other signatories were representatives of the State, Finance Minister Mr. Miroslav Kalousek and Deputy of Ministry of Interior Mr.Zdeněk Zajíček.

Manufacturers of economic and corporate systems already use a standardized form of exports of electronic invoicing messages. It enabled possibilty to the corporates, government ofices and small businesses to communicate with each other. Format was launched March 19, 2009.