The three general categories of costs included in manufacturing processes are direct materials, direct labor, and overhead. Note that there are a few exceptions, since some service industries do not have direct material costs, and some automated manufacturing companies do not have direct labor costs.
For construction businesses, this includes the materials, services, and labor that go into a project. When your construction business issues an invoice to a client for a completed portion of work, you need to include GST in the total, which is then remitted to the Australian Taxation Office (ATO).