Rent Increase Calculator

Australia uses a market-based rental system. Unlike some countries where rent increases are capped at a fixed percentage, Australian landlords are generally free to increase rent to whatever the market will bear. The main constraints are around timing, notice periods, and frequency.

The rules differ depending on whether your tenant is on a fixed-term lease or a periodic (month-to-month) tenancy. During a fixed-term lease, the rent is locked in for the duration of the agreement unless the lease specifically includes a rent review clause. If no review clause exists, you cannot increase the rent until the fixed term ends, even if market rents have moved significantly in the meantime.

On a periodic tenancy, you can review the rent, but most states limit you to one increase per 12-month period. The increase must be communicated in writing with a minimum notice period that varies by state.

The ACT is the one jurisdiction that stands apart. While rent is not formally capped in most situations, the ACT has provisions that allow tenants to challenge increases they believe are excessive. The tribunal can determine a fair market rent and override the landlord's proposed figure. In practice, this acts as a soft cap that keeps increases in line with market conditions.

It is worth noting that rent increases apply to the tenancy, not the property. If a tenant vacates and you find a new one, you can set whatever rent the market supports for the new lease. The frequency and notice restrictions only apply during an ongoing tenancy. For more detail on the practical side of rent reviews, see our guide to when to raise the rent and how to do it right.

Each state and territory has its own rules about how often you can increase rent and how much notice you need to give. Getting this wrong can invalidate your notice and delay the increase, so it is worth knowing the rules for your state.

New South Wales: Rent can be increased once every 12 months. You must give at least 60 days' written notice. For fixed-term leases, an increase is only allowed if the lease includes a clause allowing for it.

Victoria: Rent can be increased once every 12 months. You must give at least 60 days' written notice. Victoria has some of the strictest tenant protections in the country, and the recent rental reforms have added further requirements around how notices must be served.

Queensland: Rent can be increased once every 12 months for both fixed-term and periodic tenancies. You must give at least 2 months' written notice. Queensland ties the increase frequency to the tenancy rather than the property, so you cannot reset the clock by offering a new fixed-term agreement. For a broader look at your responsibilities, see our guide to Queensland landlord obligations.

South Australia: Rent can be increased once every 12 months with at least 60 days' written notice.

Western Australia: Rent can be increased once every 6 months with at least 60 days' written notice. WA is one of the states that allows more frequent increases.

Tasmania: Rent can be increased once every 12 months with at least 60 days' written notice.

ACT: Rent can be increased once every 12 months with at least 8 weeks' written notice. The ACT allows tenants to challenge excessive increases through the tribunal.

Northern Territory: Rent can be increased once every 6 months with at least 30 days' written notice.

Some states require you to use a specific official form for the notice. Check the residential tenancy authority website in your state before you send anything.

There is no single right answer, but two reference points help most landlords land on a number that is fair, defensible, and unlikely to push a good tenant out the door.

CPI as a baseline. The Consumer Price Index measures the general rate of inflation across the economy. If CPI has been running at 3% to 4%, a rent increase in that range is hard for anyone to argue with. It keeps your income roughly in line with rising costs without asking your tenant to absorb a big jump. You can find the latest CPI figures on the Australian Bureau of Statistics website.

Comparable market rents. Search for similar properties in your suburb on realestate.com.au or domain.com.au. Look at listings for the same property type with similar features. If your property is currently rented at $520 per week and comparable listings are sitting at $560 to $580, you have room to move. If you are already at the top of the range, pushing higher risks vacancy. Our guide to setting the right rent price walks through this research in detail.

The vacancy risk. This is the part many landlords underestimate. A $40/week increase sounds appealing on paper, but if it prompts your tenant to leave, the vacancy alone could cost you more than the increase was worth. Three weeks of lost rent on a $520/week property is $1,560. Add cleaning, advertising, and the time it takes to find someone new, and a single turnover can easily wipe out six to twelve months of the higher rent. If you have a reliable, long-term tenant, the maths often favours a modest increase over an aggressive one.

A practical approach is to increase annually by 3% to 5%, keeping pace with the market without creating friction. If you have not increased rent for two or more years, a larger catch-up increase may be justified, but break it into stages if possible to avoid shocking your tenant.

Small weekly increases look modest on their own, but the annual numbers add up. Here is how a $20/week increase plays out over time.

Current rent: $530/week ($27,560/year)

New rent after a $20/week increase: $550/week ($28,600/year)

Additional annual income: $1,040

That $1,040 can cover a quarter's worth of council rates, a year of water rates, or a chunk of your insurance premium. It is not nothing.

Now consider the compounding effect. If you increase rent by 4% each year starting from $530/week:

• Year 1: $551/week ($28,652/year)
• Year 2: $573/week ($29,796/year)
• Year 3: $596/week ($30,992/year)
• Year 5: $645/week ($33,540/year)

After five years of consistent 4% annual increases, your weekly rent has grown by $115 and your annual income is $5,980 higher than where you started. That is the difference between a property that slowly falls behind rising costs and one that keeps pace.

Compare that to a landlord who does not increase rent for three years and then tries to jump from $530 to $600 in one hit. The tenant is far more likely to leave, and the landlord loses the compounding benefit of the years in between.

The lesson is simple: small, regular increases are easier for tenants to absorb and better for your cash flow over time. Use the calculator above to see exactly how your planned increase affects your annual income. If you want to see how that flows through to your overall property finances, try our cash flow calculator as well.

Lease renewal is the natural moment. When a fixed-term lease is about to expire, you have a clean opportunity to review the rent, give proper notice, and either roll into a new fixed term at the updated rate or let the tenancy move to periodic. Most landlords find this is the least awkward time to have the conversation, and it gives the tenant time to decide whether they want to stay.

Market conditions matter. If vacancy rates in your area are low (below 2%), you have more room to increase because your tenant has fewer alternatives. If vacancy is high, a smaller increase or no increase at all may be the smarter move. Losing a tenant in a soft market means the property could sit empty for weeks, costing you far more than the increase would have earned.

Timing within the year matters too. Sending a rent increase notice in November or December is poor timing. Your tenant is thinking about holidays and Christmas expenses, not rent. January or February is better. People are settled back into routine, and if the tenant decides to leave, you are entering the market during the busiest rental period of the year.

Good tenants have real financial value. A tenant who pays on time, looks after the property, and never causes problems is worth more than a few extra dollars a week. Every turnover costs you money in vacancy, cleaning, advertising, and time. Before you push for the maximum increase, consider what you stand to lose. Our guide on how to keep good tenants covers this in detail.

When not to increase. If your tenant has recently gone through a difficult period, if the property has outstanding maintenance issues you have not resolved, or if you have already increased rent within the last 12 months, hold off. A poorly timed or tone-deaf increase damages the relationship and can trigger a vacancy that costs you far more than you saved.

Keep track of when your last increase took effect, what the current rent is, and when the lease expires. These are the dates that determine when you can and should review. propkt tracks these lease dates and rent amounts for each property, so you always know where you stand.