The GST Margin Scheme on Commercial Property Purchases

Most residential purchases involve no GST at all, which is one reason buyers moving into commercial property for the first time are often caught off guard by how GST works on a business premises. Commercial property is frequently sold as a taxable supply, meaning GST is added to the price in the same way it applies to any other business transaction. The margin scheme is one of the mechanisms sellers can use to work out how much GST is payable, and it changes the calculation in ways that matter to both sides of a commercial purchase.

What the Margin Scheme Actually Changes

Under the standard GST rules, a seller charges GST on the full sale price of a taxable property. Under the margin scheme, GST is instead calculated on the margin, broadly the difference between the sale price and what the seller originally paid for the property (or its value at an earlier date, depending on when it was acquired). This usually results in a lower GST amount than the standard method would produce, which is why sellers often prefer it where they are eligible to use it.

When the Margin Scheme Can Be Used

Eligibility depends heavily on how and when the seller acquired the property. Broadly, the margin scheme is available where the seller did not acquire the property through a fully taxable sale on which GST was charged at the standard rate, for example if it was bought before GST existed, acquired as part of a GST-free sale of a going concern, or inherited. If the seller was charged full GST when they bought the property, the margin scheme generally cannot be applied when they sell it. Because this depends entirely on the property's history, buyers cannot simply assume the scheme applies and should ask their conveyancer to confirm the position with the seller's representative early in the transaction, well before settlement figures are prepared.

The Written Agreement Requirement

One of the most important practical points is timing. Both parties must agree in writing that the margin scheme applies before settlement takes place, and this agreement is usually documented as a special condition in the contract of sale. If this written agreement is missing or is only raised after settlement, the seller may lose the ability to use the margin scheme at all, which can materially change the GST outcome for everyone involved. This is a detail that deserves attention during contract review as part of any thorough due diligence checklist, rather than something addressed at the last minute.

What Buyers Give Up Under the Margin Scheme

There is a trade-off for buyers. When a property is purchased under the margin scheme, the buyer generally cannot claim an input tax credit for the GST included in the purchase price, even where the property is being bought for a fully taxable business purpose. This differs from a standard taxable sale, where a GST-registered buyer can usually claim a credit for the GST paid. Buyers planning to on-sell the property later, or to use it in a way that would normally allow a credit claim, need to weigh this up before agreeing to the margin scheme as a term of the contract, and should discuss the numbers with their accountant rather than assuming the lower headline GST figure is automatically the better outcome.

Margin Scheme and Mixed-Use or Subdivided Land

The margin scheme comes up often with subdivided or partly developed land, and with properties that combine commercial and residential elements, such as a mixed-use commercial and residential lot. Where land has been subdivided from a larger holding, working out the margin can involve apportioning the original acquisition cost across the new lots, which adds a layer of complexity that a straightforward single-title sale does not have. Anyone buying land connected to a recent subdivision should expect this question to come up during due diligence and factor extra time into the process for it to be resolved properly.

Getting the Contract Terms Right

Because the margin scheme depends on agreement between the parties, the contract of sale needs to state clearly whether it applies, and this should be checked rather than assumed from a draft template. A conveyancer working on a commercial sale or purchase will typically confirm the seller's GST registration status, the basis on which the margin scheme is being claimed, and whether any evidence is required to support that claim before contracts are exchanged. This information also feeds into settlement figures, since it affects the total amount payable and how it is apportioned between the parties. As with any GST or tax question connected to a property transaction, this is general information rather than tax advice, and buyers should confirm the specific GST treatment of their purchase with their accountant before relying on it.

Why This Matters Before You Sign

The margin scheme is not something a buyer can request unilaterally after exchange, and unwinding an incorrect assumption about GST treatment after settlement is far harder than addressing it during contract negotiation. Raising the question early, confirming the seller's position in writing, and understanding what it means for input tax credits gives buyers a clearer picture of the true cost of the property before they are locked into the deal. A conveyancer experienced in commercial transactions will flag this as a standard part of contract review rather than leaving it until the settlement statement is being prepared.

According to the Australian Taxation Office, a written agreement between the parties that the margin scheme will be used must be in place on or before settlement, and buyers who purchase under the margin scheme cannot claim a GST credit on the purchase, as explained in the ATO's guidance on the margin scheme for property. Buyers can also use PEXA's service charter as a reference point for how settlement figures, including GST adjustments, are typically finalised on the day of an electronic settlement.