The AAT is an independent body that reviews certain decisions made by the Department of Home Affairs, including many visa refusals and cancellations. It reassesses the merits of the decision using updated evidence and current law.
Reviewable decisions commonly include partner, student, skilled and some business visa refusals, along with many visa cancellations made onshore. Offshore decisions are more limited. Your refusal or cancellation letter should state whether AAT review is available.
The process generally includes lodging the appeal within the strict time limit, paying the appropriate fee, preparing detailed submissions and evidence, and attending a hearing. Applicants can usually provide new documents and witness statements that were not available at the time of the original decision.