The act covers communications with a designated public official which concern the initiation, development or modification of any public policy, the preparation of legislation, or the award of any grant, loan contract, licence involving public funds.
The law applies to the lobbying of ministers, TDs, senators, MEPs, local councillors, special advisers, and designated public officials.
Part 4, in respect of enforcement provisions, commenced on 1 January 2017.
The Standards Commission has the power to investigate contraventions if they have a reasonable belief they have occurred.
A Dublin-based company, Bissett Industrial, registered to lobby on 25 January 2017.
Under section 20 of the Act, those in contravention can be subject to a class C fine, up to €2,500.