Double dissolution (Australian parliamentary procedure)

A double dissolution is a constitutional mechanism in Australia allowing the Governor‑General to dissolve both houses of Parliament to resolve legislative deadlocks under Section 57.

Overview

A double dissolution is a procedure under the Australian Constitution that permits the Governor‑General to dissolve both the House of Representatives and the Senate at the same time. It is used to break a legislative stalemate between the two chambers and triggers a full election for every seat in both houses, rather than the usual practice of electing all members of the lower house and only half of the upper house.

Constitutional basis and trigger

The power to call a double dissolution is found in the constitutional provision commonly referred to as Section 57. The mechanism requires that a bill be passed by the House, then rejected or failed in the Senate, then passed again by the House after an interval of at least three months and again rejected by the Senate. If these conditions are met, the Prime Minister may advise the Governor‑General to dissolve both houses simultaneously.

Key steps in the procedure

Passage of a bill in the House of Representatives.
Rejection, amendment or failure to pass the bill in the Senate.
A second passage of the bill in the House after a waiting period, followed by a further rejection or failure in the Senate.
Advice to the Governor‑General to issue writs for a double dissolution election.

Consequences and follow-up

A double dissolution leads to a full election. If the same legislative deadlock continues after the election, the Constitution permits the Parliament to be convened for a joint sitting where members of both houses vote together on the disputed bills; a majority of the combined membership is required to pass them. The procedure is significant because it removes the usual numerical advantage the Senate can exert when only half its seats are contested.

Political implications and timing

Governments may use a double dissolution as a strategic tool to overcome an obstructive Senate, but it carries risks: the ruling party can lose seats in either chamber and potentially its majority in the House. The process also affects senators' terms: after a double dissolution, terms and rotation of the Senate must be re-established under parliamentary practice.

History and notable instances

Double dissolutions have been rare in Australia, but have occurred at several points in the nation's history. Notable examples took place in the 20th and 21st centuries when governments chose the route to resolve persistent deadlocks. For further constitutional text and commentary see the constitutional provision at constitutional provision and material on the roles of the lower and upper chambers, House of Representatives and Senate.