The SIA supervises qualified auditors and registered audit firms.
The area of supervision, representing the single largest activity at the agency, covers:
- Inspections: Inspections are performed for qualified auditors and registered audit firms. Both in respect of the special quality control of auditors in public interest entities, and for other qualified auditors.
- Enforcement and Investigations: Cases are investigated in response to reports or the SIA having opened a case on its own initiative. There is a special decision-making body within the SIA, the Disciplinary Board of Public Accountants, which, among other things, makes decisions in issues relating to disciplinary actions.
- Risk-based oversight: These are cases that are initiated by the SIA and that are based on identified and/or suspected risk factors.
- Advance rulings: These can relate either to whether an auditor, with regard to his or her impartiality and independence, can take on a specific audit assignment or whether an auditor is permitted to carry out a so-called side activity.