How do I close an Australian company I no longer use?

Apply for voluntary deregistration if all shareholders agree, the company has stopped business, holds assets worth less than A$1,000, has no debts or legal proceedings and has paid all ASIC fees. ASIC publishes a notice, and the company can be deregistered two months later. Apply at least two weeks before the annual review fee is due.

Company closure

Source: Voluntary deregistration of a company, Australian Securities and Investments Commission