In NSW, a landlord can only increase rent during a fixed-term tenancy if the tenancy agreement specifically includes a rent increase clause that states the amount or method of calculation. If no such clause exists, rent cannot be increased until the fixed term ends.

For periodic (rolling) tenancies, the landlord must provide at least 60 days' written notice before a rent increase takes effect. Rent can only be increased once every 12 months, regardless of the tenancy type. Tenants who believe a rent increase is excessive can apply to the NSW Civil and Administrative Tribunal (NCAT) for a review.