Commercial rents across Australia rose by 6.5% in the year to March 2026, while the national vacancy rate sat at 1.3% — well below the 3% mark that signals a balanced market. For any business renting commercial space, that gap between demand and supply puts upward pressure on rent. But unlike residential tenancies, commercial leases in Australia have no nationwide cap on how much rent can go up. The rules that do exist come down to your lease, your state, and whether you are in a retail premises.
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This article is general information only and does not constitute professional advice. For your specific situation, consult a qualified professional.
Most states leave commercial rent increases to the lease agreement, not to legislation. That means understanding how CPI rent reviews work, what floors and caps do, and when retail lease protections kick in matters more than looking for a government-set limit. Here is what you actually need to know.
What This Article Covers — Key Takeaways and the Term You Need to Know
One term you will bump into constantly in commercial leases is the CPI rent review.
What I tend to notice is that tenants focus on the starting rent and overlook how the review clause works. The difference between a CPI review with a 3% floor and one with a 5% cap can add up to thousands of dollars over a five-year lease. It is worth weighing that against the base rent when you compare properties.
How Commercial Rent Increases Work Across Australia
For commercial properties, the rules around rent increases come from your lease, not from a statewide cap. The table below shows what each state and territory requires for commercial rent reviews, including notice periods and the bodies that handle disputes.
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| State / Territory | Standard notice period | Review body | Retail lease protections |
|---|---|---|---|
| ACT | 8 weeks | ACAT | Yes — CPI plus 10% cap |
| NSW | 60 days | NCAT | Yes — Retail Leases Act applies |
| Victoria | 90 days (from 25 Nov 2025) | VCAT | Yes — Retail Leases Act applies |
| Queensland | 60 days | QCAT | Yes — Retail Shop Leases Act applies |
| Western Australia | 60 days | Magistrates Court | Limited — Commercial Tenancy Act |
| South Australia | 60 days | SACAT | Yes — Retail and Commercial Leases Act |
| Tasmania | 60 days | Commissioner | Limited — no dedicated retail act |
| Northern Territory | 30 days | NTCAT | Limited — no dedicated retail act |
The notice periods above apply to commercial and retail leases in each jurisdiction. What is not on this table is a hard cap on the increase itself — because outside of the ACT’s residential cap, no state sets a maximum percentage for commercial rent rises. That is what makes the wording of your lease so important.
Beyond the notice period and the review body, the total cost of a rent increase includes the time and legal fees spent negotiating or challenging it. A tenant who questions an increase at VCAT or NCAT pays for their own representation, and the process can take weeks. Those costs sit outside the rent figure itself but still hit the bottom line.
Common Mistakes with Commercial Rent Increase Clauses
Assuming your state caps the amount
Many tenants walk into negotiations believing their state or territory puts a ceiling on how much commercial rent can rise. It does not. The ACT’s CPI-plus-10% rule is residential only. In every other state, the increase is whatever the lease says it is, as long as proper notice is given. A tenant who assumes a cap exists may sign a lease with an open-ended CPI review and later face a jump they did not expect.
Not checking which CPI series the lease uses
Commercial leases often reference “CPI” without specifying which series. The ABS publishes multiple CPI figures — All Groups, Excluding Volatile Items, and separate indexes for each capital city. A lease that uses “All Groups CPI for Sydney” can produce a different figure than one using “CPI for Australia.” The difference is usually small, but over a long lease term it adds up. I would always ask for the exact CPI series and the reference quarter to be written into the clause.
Overlooking the floor and cap options
A floor means the rent goes up by at least X% even if CPI is lower. A cap means the increase stops at Y% even if CPI is higher. Neither is a standard term — they are negotiated. A tenant who does not ask for a cap may end up paying 8% or 9% more in a high-inflation year. A landlord who does not ask for a floor may get zero increase when CPI dips. Both sides leave money on the table by not raising the topic.
Ignoring retail lease protections
If you rent a shop, café, restaurant, or showroom, your state’s retail leasing legislation may override your lease terms. In NSW, the Retail Leases Act limits how often rent can be reviewed and what methods are allowed. In Queensland, the Retail Shop Leases Act gives tenants the right to challenge an increase at QCAT even if the lease says otherwise. A tenant who signs a standard commercial lease for a retail space may miss out on these protections. It is worth checking whether your premises qualifies as a retail lease under your state’s law before you sign.
How to Handle a Commercial Rent Review — From Lease to Tribunal
Understanding the CPI formula
The standard formula for a CPI rent review is straightforward: new rent equals current rent multiplied by the CPI movement between the base quarter and the review quarter. If your current rent is $60,000 a year, the base CPI is 130.0, and the current CPI is 134.0, the CPI movement is 3.08% (4.0 ÷ 130.0). Your new rent becomes $61,846. That is the calculation in its simplest form. Complications arise when the lease does not specify which CPI figure to use, what happens if the ABS restructures the index, or whether the review applies on the anniversary date or the option date. Every one of those details should be in the lease.
Negotiating floors and caps
A floor clause locks in a minimum increase — for example, “CPI or 3%, whichever is greater.” That protects the landlord in low-inflation years. A cap sets a maximum — “CPI up to 5%.” That protects the tenant in high-inflation years. In a market where rent growth is running at 6.5%, a cap of 5% saves the tenant 1.5% that year. Over a five-year lease, that difference compounds. The trade-off is that landlords may ask for a higher base rent or a longer lease term in exchange for a cap. Both sides need to run the numbers before agreeing.
Challenging an excessive increase
If you believe a rent increase is excessive, you can apply to the relevant tribunal — VCAT in Victoria, NCAT in NSW, QCAT in Queensland, or SACAT in South Australia. The tribunal compares your proposed rent against comparable properties and market conditions. You will need evidence: recent rents for similar spaces in the same area, a property condition report, and any correspondence about the increase. The process takes weeks, not days, and you will need legal or professional representation. Some tenants use online real estate law services to prepare their case. The tribunal can reduce the increase, but it cannot freeze the rent forever. A successful challenge usually results in a smaller increase, not a flat denial.
Future reforms and what they mean
Several states are moving toward tighter regulation of commercial and retail leases. Victoria’s 2026 reforms include a ban on no-fault evictions and minimum property standards. Queensland ended no-grounds evictions in 2026 and introduced a portable bond scheme pilot. NSW has draft legislation on no-fault eviction reforms expected in the second half of 2026. These changes affect residential tenancies directly, but they signal a broader shift toward tenant protection that may eventually reach commercial leases. For now, the best protection is a well-drafted lease with clear rent review terms.
Frequently Asked Questions About Commercial Rent Increases
Can a commercial landlord raise rent by any amount? ▾
How often can a commercial landlord increase rent? ▾
What is the difference between a fixed increase and a CPI review? ▾
Can I challenge a commercial rent increase I think is too high? ▾
Does retail lease legislation protect me from high increases? ▾
What happens if the lease does not mention rent reviews? ▾
What the Shift Toward Tenant Protection Means for Your Next Lease
The 2026 reforms in Victoria, Queensland, and NSW show a clear direction: more protection for tenants, less room for landlords to raise rent without justification. While these changes currently target residential tenancies, the commercial lease market is not immune to the trend. Retail lease protections are already strong in several states, and the gap between residential and commercial rules may narrow over time. For now, the best move is to treat your rent review clause as a negotiable term, not a fixed one. Ask for the CPI series, the formula, the floor, and the cap to be written into the lease before you sign.
Remember: this article is general information only. For advice on your specific situation, speak to a qualified professional.
If this was useful, you might also want to read Understanding Your Rental Contract Obligations in Australia.
Sources and Further Reading
Tips for Understanding Gross Leases When Renting Commercial Space — A practical breakdown of how gross leases handle rent and outgoings, including how rent review clauses differ from net leases.
Commercial Property Checklist: Essential Questions to Ask Before You Sign in Australia — A step-by-step guide to the questions every tenant should ask about rent reviews, outgoings, and lease term before signing.
PropAlly (2026). Rent Increases — Australia Guide. 🔗
WealthWorks (2026). New Rental Reforms & Tenant Protections Australia 2026 Guide. 🔗
Sprintlaw (2026). CPI Rent Review — How It Works in Commercial Leases in Australia. 🔗
