Quick answer: In most migration cases, missing your Administrative Review Tribunal deadline permanently ends your right to a merits review. The ART generally cannot extend these deadlines — but a small number of narrow, exceptional pathways may still exist depending on your circumstances.
Does the ART Deadline Run From Calendar Days or Business Days?
Calendar days, not business days — and this trips up more applicants than any other detail. Your decision letter from the Department of Home Affairs states the exact time limit for your case, commonly 21 or 28 days, though character-related refusals can be as short as 7–14 days for people in detention. The clock starts from the day you're deemed to have received the decision — not the day you actually opened the email or letter. If notice was posted, deemed receipt is calculated using a fixed number of working days after dispatch; if it came through ImmiAccount, it's usually the day the message was sent. Working from the wrong start date is one of the most common ways people accidentally miss the ART appeal deadline.
What Happens If I Miss My ART Appeal Deadline?
For most migration and protection decisions, once the 21- or 28-day window closes, the Tribunal has no discretion to accept a late application — the missed 21 day ART deadline or missed 28 day ART deadline effectively closes that door. Your merits review rights are lost, and the original refusal or cancellation decision stands.
Can I Extend the ART Appeal Deadline in Australia?
Almost never through the Tribunal itself. For the large majority of migration categories, the ART simply has no legal power to grant extensions, regardless of the reason for the delay. This is a deliberate feature of the framework introduced when the ART replaced the AAT in October 2024.