Note than in NSW, if you end up paying stamp duty on a zero-emissions vehicle (because it is over the current price threshold) that vehicle will be exempt from payment of the Road Usage Charge, whenever it comes into effect, for the life of the vehicle or until it is traded (and is duty exempt at the time of the trade).
In a way, you can consider ZEV stamp duty as an up-front payment of the RUC.
From 1 July 2027 (or when ZEVs are >30% of new vehicle sales), NSW stamp duty will be removed from all ZEVs regardless of price, and all those ZEVs will be subject to the RUC.
Some people might think that it’s worth paying just over the threshold for a ZEV if it means they’ll never pay the RUC on that vehicle. Some will win on that equation, others would lose.