"What would happen if the coalition of parties in government decided to break their coalition?"

The Australian government is part of the Australian Parliament. After a federal election, the party (or coalition of parties) with the support of the majority of members elected to the House of Representatives becomes the government.

To remain in office the government must keep the support of the majority in the House of Representatives.

If a government coalition decided they no longer wanted to work together, — and the government no longer had the support of the majority of the members of the House of Representatives — several things could happen;

Although government is formed in the House of Representatives, there are also members of the government in the Senate. The government may or may not hold the majority of seats in the Senate.

diagram to help explain What would happen if the coalition of parties in government decided to break their coalition?