Aside from legislation issued by the government and the House of Representatives, much of the relevant law in Indonesia is derived from regulations and decrees issued by BI and OJK.

OJK regulations are the main legal framework in Indonesia for the banking, financial services and insurance industries. There is also a large volume of secondary and delegated legislation. BI regulations are the main regulatory framework for monetary and payment system services and also for macro-supervision of the banking and finance industry.

Both BI and OJK issue rules and guidance, which apply to the firms that they regulate. BI and OJK publish a handbook that contains detailed rules and guidance. These rules and guidance are applicable primarily to Indonesian regulated or supervised firms but are also relevant in certain respects for non-Indonesian firms.