Why Parliament has privileges
Parliamentary privilege refers to legal powers and immunities that allow the Senate, House of Representatives and their committees to perform their functions without improper outside interference. The protections are connected to parliamentary proceedings rather than giving parliamentarians a blanket exemption from ordinary law.
The system protects debate, inquiry and evidence-gathering because Parliament must be able to examine public issues and government conduct even when the subject matter is contentious.
Freedom of proceedings
A central protection is that parliamentary debates and proceedings cannot be questioned or impeached in court in the ordinary way. Members can speak in parliamentary proceedings without being sued for defamation over those statements, and witnesses giving protected committee evidence receive related protection.
The protection belongs to the functioning of Parliament. Repeating the same statement outside Parliament can create very different legal consequences because the external repetition may not be covered by parliamentary privilege.
Committees and witnesses
Privilege supports committee inquiries by protecting evidence that forms part of parliamentary proceedings and by giving houses powers needed to conduct inquiries. Committees can call for information and, within their lawful powers, require attendance or documents.
Witnesses should still follow committee instructions and published guidance. Privilege does not mean every interaction with a parliamentarian is automatically protected.
Contempt of Parliament
The houses have powers concerning conduct that improperly interferes with their functions. Such conduct can amount to contempt. The Parliamentary Privileges Act 1987 and parliamentary practice govern important aspects of these powers and protections.
Because privilege is a specialised area of law, confident claims about whether a particular document, conversation or publication is protected should be checked against authoritative parliamentary guidance or legal advice.
How to read a privileged allegation
A statement made under parliamentary privilege is not automatically proven simply because legal proceedings cannot challenge the parliamentary speech in the usual way. Privilege protects the forum; it does not certify the factual accuracy of every allegation made there.
Responsible reporting should therefore identify the allegation as such, seek supporting evidence and distinguish the legal protection of the speech from the truth of the underlying claim.
Primary sources and further reading
We use authoritative Australian institutions as the starting point for this explainer. Follow these links for the underlying rules, official guidance and current details.