The Code of companies and associations is the base legislation for the consolidation requirements in Belgium.
Consolidated financial statements are prepared in accordance with Belgian GAAP as defined in the royal decree of 29 April 2019 (Dutch | French).
The royal decree of 18 January 2005 (Dutch | French) allows companies to publish their consolidated financial statements in accordance with IFRS, however this decision is irrevocable.
For all quoted companies, credit institutions, insurance companies and investment firms, the consolidation if IFRS as adopted by the European Union is an obligation.
The obligation to prepare and file consolidated financial statements is further governed by legal rules laid down in 3:21 to 3:36 of the Code of companies and associations (Dutch | French).
Every company that either exercises sole or joint control over one or more subsidiaries or that forms a consortium together with other entities (entities with common management according to article 1:19 of the Code of companies and associations is required to prepare consolidated financial statements.