Got a rent increase notice and your stomach dropped? You’re not alone. Rent increases are the number one source of anxiety for Australian tenants right now, and with good reason — in some capital cities, rents have risen 30-40% over the past three years. But here’s what a lot of tenants don’t realize: your landlord can’t just increase your rent by whatever amount they want, whenever they want. There are rules, and they’re stronger than most people think.

The Basics: Timing Restrictions

Every state and territory has rules about how frequently rent can be increased. The specifics vary, but the general principle is that landlords can’t hit you with increases constantly.

NSW: Rent can only be increased once every 12 months during a periodic (month-to-month) agreement. During a fixed-term lease, rent can only increase if the lease specifically includes an increase clause. If the lease is silent on increases, rent stays the same until the fixed term ends. Landlords must give at least 60 days’ written notice.

Victoria: Similar to NSW — once every 12 months, with at least 60 days’ notice. Fixed-term leases can only include increases if the amount or method is specified in the agreement. “Market rate” clauses aren’t enough; the actual increase must be determinable.

Queensland: Once every 6 months, with at least 2 months’ notice. This is one of the shorter intervals in Australia. The Queensland government has faced pressure to extend it to 12 months, but as of March 2026, the 6-month rule still stands.

South Australia: Once every 12 months, with 60 days’ notice. Increases during a fixed-term agreement can only happen if stated in the lease.

Western Australia: At least 6 months between increases, with 60 days’ notice. Fixed-term leases can include increases if specified.

ACT: Once every 12 months, with 8 weeks’ notice. The ACT also has a unique mechanism where tenants can apply to have excessive increases reviewed — more on that below.

Tasmania: Once every 12 months, with 60 days’ notice.

What Counts as Excessive?

This is where it gets interesting. In most states, there’s no hard cap on the dollar amount of a rent increase. Landlords are technically free to propose whatever amount they want. But “excessive” increases can be challenged.

The test generally involves comparing your proposed new rent to comparable properties in the area. If your landlord wants to increase your $500/week apartment to $650/week, but comparable two-bedroom apartments nearby are renting for $550-580, you’ve got grounds to argue the increase is above market.

In the ACT, tenants can apply to the ACT Civil and Administrative Tribunal (ACAT) for a review if they believe an increase is excessive. The tribunal assesses whether the proposed rent is significantly higher than comparable properties, considering the property’s condition, age, location, and amenities.

In NSW, tenants can apply to the NSW Civil and Administrative Tribunal within 30 days of receiving a rent increase notice. The tribunal can determine whether the increase brings the rent above the general market level and order a lower amount.

Victoria doesn’t have a formal “excessive increase” challenge mechanism in the same way, though tenants can negotiate directly with landlords. Consumer Affairs Victoria provides information about median rents by suburb that can support your position.

The Notice Requirements Matter

Invalid notices are surprisingly common, and they’re a powerful defence. If your landlord doesn’t follow the correct procedure, the rent increase doesn’t take effect — even if the amount itself is reasonable.

Common errors include: giving insufficient notice (less than the required 60 days in most states), not using the correct form (most states require a specific written form, not just an email or verbal notice), failing to specify the new amount clearly, and attempting an increase during a fixed term when the lease doesn’t allow it.

If you receive a rent increase notice that doesn’t comply with the requirements, don’t just ignore it. Write back to your landlord or agent pointing out the deficiency. Cite the specific section of the Residential Tenancies Act. This forces them to start the process again with a compliant notice, which buys you time and may discourage the increase altogether.

How to Challenge an Increase

Step one: check the notice for compliance. Is it in writing? Does it give sufficient notice? Is it in the correct form? Is it within the allowable frequency? If any of these fail, the increase is invalid. Respond in writing to the landlord.

Step two: research comparable rents. Look at current listings for similar properties in your area. Similar means similar in size, condition, age, and location. A renovated apartment isn’t comparable to your unrenovated unit even if they’re on the same street. Screenshot listings with dates. Data from the likes of Domain or realestate.com.au provides good comparative evidence.

Step three: negotiate. Write to your landlord or agent explaining that you believe the increase is above market. Provide your comparable evidence. Propose an alternative amount that you believe is fair. Many landlords will compromise rather than risk losing a paying tenant.

Step four: if negotiation fails and you believe the increase is genuinely excessive, apply to your state or territory tribunal for a review. The process is designed for tenants to use without legal representation, and the filing fees are minimal (usually under $50).

The Hidden Rule: Retaliatory Increases

In most states, it’s illegal for a landlord to increase rent in retaliation for a tenant exercising their rights — such as requesting repairs, reporting the property to authorities, or joining a tenants’ union. If your rent increase arrives suspiciously soon after you complained about a broken heater, you may have grounds to argue it’s retaliatory.

Proving retaliatory intent is hard, but tribunals take it seriously. Document the timeline: when you made the request or complaint, when the rent increase notice arrived. If the pattern is suggestive, raise it in any tribunal proceedings.

Know Your Position

The rental market is tough right now, and landlords have more bargaining power than they’ve had in years. But that doesn’t mean tenants have no rights. The rules exist for a reason, and they apply even in tight markets. Understanding them — and being willing to enforce them — is the best protection you have against unreasonable increases.