A Time & Materials project is billed based on the number of hours worked, at the hourly, daily, or monthly fixed billing rates assigned for that project. A Fixed Bid project is billed using a flat amount, regardless of the number of hours worked.
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).