No current sign on bonus (not for the last few months anyway), however in a couple of weeks from now, this monthly points earning cap starts:
^Points Cap: Qantas Points are uncapped until 30 June 2022. From 1 July 2022, for BusinessChoice Rewards Platinum cards, earn 0.75 Qantas Points per $1.50 spent on eligible business purchases and 0.5 Qantas Points per $1.50 spent on Government payments up to a maximum of 100,000 Qantas Points per facility per month. This limit resets each month based on your facility’s statement date. Bonus Points earned are not a part of your monthly cap.
^Points Cap: Qantas Points are uncapped until 30 June 2022. From 1 July 2022, for BusinessChoice Rewards Platinum cards, earn 0.75 Qantas Points per $1.50 spent on eligible business purchases and 0.5 Qantas Points per $1.50 spent on Government payments up to a maximum of 100,000 Qantas Points per facility per month. This limit resets each month based on your facility’s statement date. Bonus Points earned are not a part of your monthly cap.