When an ATO Director Penalty Notice arrives, the 21-day clock starts...

https://www.lawyersweekly.com.au/sme-law/44139-what-solicitors-need-to-know-when-a-client-receives-a-director-penalty-notice

When an ATO Director Penalty Notice arrives, the 21-day clock starts immediately. You must quickly distinguish between lockdown and non-lockdown penalties to advise your client correctly