Residential Tenancies Act 1997

A lessor must not increase the rental rate under a residential tenancy agreement unless the increase takes effect at least 12 months after—

for the first increase under the agreement—the day the residential tenancy agreement started; or

for a later increase under the agreement—the day the last increase in rental rate took effect.

However, for a consecutive tenancy agreement, the lessor must not increase the rental rate unless the increase takes effect at least 12 months after the day the last increase in rental rate took effect, whether under the consecutive tenancy agreement or a terminated residential tenancy agreement.