In the first Certificate of Entitlement bidding round for November, COE premiums rose across the board.
Revenue from certificates of entitlement and vehicle registration taxes for the financial year will shrink by $1.1 billion.
The quota for Certificates of Entitlement is set to shrink six percent, with 24,234 COEs available from November 2016 to January 2017.
The supply for COEs for the August-October quota period has contracted because more motorists have decided to extend.
Vehicle buyers will have fewer Certificates of Entitlement to bid for during the quota period from August to October.