A Strategic Tool for Property Developers and Family Investors in WA
In Western Australia, a deed of partition is one of the most under-utilised tax structuring tools for property developers and their advisers. Used correctly, it allows co-owners of land to divide property so that each walks away owning a defined parcel outright — tailored for their tax strategy – sometimes without triggering unintended tax or duty consequences.
Let’s examine three common scenarios.
Claremont Development: Mother and Son Want One Home Each
Assume a mother and son are acquiring a development site in Claremont. Their intention is simple – subdivide, construct two dwellings, Mum takes the left lot, the son takes the right, and then each lives in their new home as their main residence.
If they buy the site jointly (for example, 50/50 tenants in common), they will legally co-own the entire parcel. So Mum will own half of both lots, and the son will own half of both lots. When titles are issued, each lot is co-owned. And formal separation can trigger transfer duty and taxation on the sale.
A deed of partition allows the titles of Lot A to be transferred to the mother outright and the titles on Lot B to be transferred to the son outright.
This is important as it unwinds the ownership arrangement of the two.
Economically, no one is better or worse off if the lots are broadly equal in value — they simply crystallise what they always intended.
If they are not carrying on a development but genuinely intend to live in the dwellings long term, the risk of paying GST is typically low. However, if they approach the project commercially (borrowings, project management, sales intention, not making the property a home, repeated development), GST registration may be triggered – even if they live in it.
If the home was owned half each the situation is much more complex. The sale of the half share interest in the home, say, 12 months after construction could trigger a GST liability.
If each party acquires their dwelling via partition and then uses it as their main residence, the main residence exemption should shelter future capital growth.
The key is intent and occupation. If they live there long term, a deed of partition enables each to hold their home outright — simplifying future sale and avoiding cross-CGT exposure.
Importantly, the main residence exemption only applies on the portion of the home you live in and own. If you own half of the home and live in it, that half will be tax free. But the person owning the other half who does not live in the home, cannot claim the main residence exemption. And you can’t claim the exemption over two properties.
So, if the properties were owned half each, the sale of the homes later on, without a deed of partition, could trigger capital gains tax.
In WA, partition duty principles can apply so that duty is not imposed on the full value of each lot, but only on any excess value one party receives beyond their original proportional entitlement.
If the lots are broadly equal in value and reflect original ownership proportions, additional duty exposure may be limited.
The lesson: structure the co-ownership correctly at acquisition, and prepare the deed of partition at the subdivision stage — not later.
Applecross Structure: Developer Company (85%) and Family Trust (15%)
Now consider a more sophisticated structure. A business owner intends to do a large development with residential land that will be sold as trading stock, and part of the land will be built on with the intention to rent (say the shopping centre).
The owner could structure the project with a company they control (85%) and a family trust they control (15%).
The strategy here is two fold – sale and also retention. So, a deed of partition allows a project to be tax structured so the tax strategy follows the investment strategy.
Importantly, a deed of partition, made at purchase, could structure the project so the company owns the trading stock (taxed at company tax rates) and the trust owns the long term lease asset (which could enjoy the 50% CGT discount on ultimate sale).
The result is that the company continues to treat its lots as trading stock and the trust holds its allocated lot as a capital asset.
CGT Outcome
The company’s profits are taxed on revenue account.
The trust, provided it holds the property for more than 12 months and the asset is on capital account, can access the 50% CGT discount on eventual sale — flowing through to beneficiaries.
Partition enables clean separation of tax character.
Goods and Services Tax
The company will account for GST on sale of trading lots.
If the trust retains its lot and does not make a taxable supply, GST may not arise. If the intention is for commercial rent however, GST might be relevant.
Intent, documentation and accounting treatment are critical.
Transfer Duty
Partition can reduce unintended duty consequences provided each party receives property reflecting its pre-existing interest. If the trust receives more than its proportional entitlement, additional duty exposure arises.
Timing and valuation discipline, together with legal support for stamping, are essential.
Neerabup: Cornerstone Investor in a Large Land Development
In large-scale land subdivisions — such as in Neerabup — it is common for a cornerstone investor to take, for example, the future shopping centre site. The investor might not want the residential land projects, and they may not want the risk attached to that project.
The developer wants:
- Residential lots treated as trading stock.
- The shopping centre parcel removed from trading stock.
- The cornerstone investor to hold the commercial site directly.
Why Partition Is Powerful
If the cornerstone investor is a co-owner from day one, a deed of partition at subdivision can allocate:
- Residential lots to the developer.
- The commercial site to the cornerstone investor.
Each party walks away owning distinct land.
Transfer Duty Timing
The most important point: the cornerstone investor must be an owner at the outset.
If they join later and “buy in” after subdivision, duty is unavoidable (with legal advice of course).
If they are a co-owner from the beginning and partition merely crystallises existing entitlements, duty exposure can be materially reduced because there is no new beneficial acquisition — only a division of what was already owned.
This is where structuring at acquisition stage matters.
Tax Character Separation
The Deed of Partition allows residential land to remain trading stock of the developer and the shopping centre site to be treated on capital account by the cornerstone investor.
That separation protects tax character and prevents unintended revenue treatment of long-term assets.
The Westcourt 6-point checklist: Deed of Partition (WA)
Before signing contracts (not after subdivision), confirm:
- End ownership: who will own which lot on completion (and do percentages match the economic deal — e.g., 50/50 or 85/15)?
- GST position: private build-to-live vs development enterprise; any intended sales; any commercial leasing (GST registration / credits).
- Duty modelling: likely end-lot values and whether any party receives value above their existing entitlement (duty leakage risk).
- Tax strategy: which parcels are trading stock vs capital hold (ensure documents and accounting agree).
- Main residence: for family builds, ensure each person owns the dwelling they will occupy before move-in to avoid messy later “swap” transfers.
- Timing + lender: align the deed with subdivision and obtain lender consent early.
Final Observations for Perth Business Owners
A deed of partition is not a magic wand. It does not eliminate GST, CGT or duty and it does not work after the contract is signed. What it does is align legal ownership with economic intention, preserve capital account treatment where appropriate, minimise unnecessary transfer duty, ensure tax exemptions are retained where relevant, separate trading stock from long-term investment assets and simplify future exits.
A deed of partition is simply another “tax toolkit” strategy commonly engaged by Westcourt when supporting small and large property developments.
If you are contemplating a joint development, a mixed capital/revenue structure, or bringing in a cornerstone investor, the partition mechanics should be part of the initial feasibility model — not an afterthought. Engaging a private business tax adviser for your property development can make a significant net difference to your project. This is where Westcourt can make a significant difference – because once land titles are issued, flexibility disappears — and tax follows form.
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