GST Margin Scheme

The GST margin scheme is an ATO mechanism that changes how GST is calculated on a property sale — not whether GST applies. Under the ordinary rules a registered seller remits GST of one-eleventh of the full sale price. Under the margin scheme, GST is one-eleventh of the margin instead — broadly, the sale price minus what you paid for the property. On a deal with a large land or acquisition cost, that can be a materially smaller GST bill.

The scheme only matters once GST is in play at all, and for a flipper that is the threshold question. A one-off renovation of an established home is usually an input-taxed sale of existing residential premises with no GST. But if your activity looks like an enterprise — repeated projects, or a build that amounts to substantial renovations or creates new residential premises — the sale can become a taxable supply, and registration is generally required once turnover reaches the $75,000 threshold. That is the point at which the margin scheme becomes relevant.

The conditions that catch people

Eligibility is not automatic. The margin scheme is only available if the seller and buyer agree to use it in writing on or before settlement, and it cannot be used where the property was originally acquired as a fully taxable supply without the scheme. It is most commonly seen on subdivisions and new developments rather than cosmetic flips. Getting it wrong — assuming a sale is GST-free when it is taxable, or missing the written-agreement requirement — is an expensive mistake to unwind after the fact.

Because the interaction between GST, income tax and CGT on the same deal is genuinely complex and specific to your circumstances, this is a term to model early and confirm with a registered accountant, not to self-assess. The guide to GST on flipping houses works through when it applies and a margin-scheme example, and the CGT calculator helps with the other side of the tax picture. General information only — not tax advice.