Maximum Bond Amount

In no particular order...

VICTORIA

1 month’s rent (but if the rent is more than $350 a week, the amount of bond should be negotiated between the owner and tenant in which case no limit applies). 
The bond cannot be increased ('top-ups') during a tenancy under any circumstances, including rent increases or damage to the property.
Consumer Affairs
Lodging a bond in Victoria

NEW SOUTH WALES

4 weeks’ rent. 
The bond cannot be increased ('top-ups') during a tenancy under any circumstances, including rent increases or damage to the property.
NSW Fair Trading
Lodging a bond in NSW

QUEENSLAND

4 weeks’ rent (but if the rent is more than $700 per week, the amount of bond should be negotiated between the owner and tenant in which case no limit applies).
A bond can be increased during a tenancy if the rent is increased. See legislation.
RTA Queensland
Lodging a bond in QLD

NORTHERN TERRITORY

4 weeks’ rent.
The bond can be increased after two years if the rent is increased.
NT Gov
Lodging a bond in NT

WESTERN AUSTRALIA

4 weeks’ rent, (but if the rent is more than $1,200 per week, the amount of bond should be negotiated between the owner and tenant in which case no limit applies).
An additional Pet Bond of up to $260 may also be charged if Pets are allowed to stay at the property. 
A bond can be increased during a tenancy if the rent is increased. See legislation.
Consumer Protection WA
Lodging a bond WA

SOUTH AUSTRALIA

4 weeks’ rent (but if the rent is more than $250 per week, the amount of bond can be a maximum of 6 weeks' rent).
The bond can be increased two years after it is received or if it has been two years since the last increase. See legislation.
SA Gov
Lodging a bond in SA

TASMANIA

4 weeks’ rent. 
The bond cannot be increased ('top-ups') during a tenancy under any circumstances, including rent increases or damage to the property.
TAS Gov
Lodging a bond in TAS

AUSTRALIAN CAPITAL TERRITORY

4 weeks’ rent.
ACT Revenue Office
Lodging a bond in the ACT