Thursday saw the Democratic Alliance civil society organisations like My Vote Counts, which took the matter to the Constitutional Court, and trade union federation Cosatu make submissions for and against some of the regulations.
Today will see organisations like business unity South Africa and business leadership SA as well as other political parties make further submissions.
Submissions have called on the funding threshold to be lowered from R100,000 to R50,000 so it covers even smaller parties.
Political parties have been forced to disclose their funders to the public after the NGO, My Vote Counts won a Constitutional Court case in June last year.
The court gave Parliament 18 months to amend the legislation to include a requirement for the recording, preservation and reasonable disclosure of information on the private funding of political parties and independent candidates.
Parliament passed the new bill last year and President Cyril Ramaphosa signed it into law in February this year.
IEC chief executive Sy Mamabolo says the submissions on say one of the hearings were of a technical nature and will be taken into account.