The Solvency II Directive will require National Competent Authorities (NCAs) to deliver quantitative reporting information to EIOPA in XBRL format, but it allows each NCA to decide how to collect the data from firms. Research conducted by Solvency II Wire reveals that currently over half of the NCAs intend to require or allow firms to report in XBRL after 1 January 2016. Only about a third of NCAs will do so for the interim period. 20 NCAs responded directly to questions about their intentions to require firms to report in XBRL, both during the interim period and after implementation. Information for the remaining NCAs was gathered from industry sources. The survey covers all Member States except Bulgaria. Details of specific requirements for individual Member States can be found in the Solvency II preparatory Guidelines interactive map.