Do you have a lot of post Xmas expenses and is rego one of them? I do.
The RTA along with CTP insurers allow 6 month renewal terms. For the CTP mine was about $12.00 extra for the privelege. RTA was almost the same. Choosing a 6 mth term pushes my bike rego/CTP insurance out to July, a period with less recurring expenses, at which time I will renew for a 12 month term. May cost you more if you have to get an inspection but you don't need one of those for bikes less than 5 yrs.
Check the RTA site and with your CTP insurer if this interests you.