2022 Federal Senate Election (anytime, 1 JUL 2021 – 21 May 2022)

The half-Senate election must then be held by mid-May 2022.

When can a ‘normal’ election be held? has a three-part answer:

The first date for a normal house and half-Senate election is 7 August 2021, if announced this weekend and writs are issued by Monday 5 July.
The last date for a normal house and half-Senate election is 21 May 2022. This date gives six weeks to complete the complex Senate count and allows Senators to be declared elected and start their terms on 1 July. A mid-May election would be announced in early April 2022.
There is a highly improbable option for a half-Senate election by 21 May 2022 and a separate House election as late as 3 September 2022.