Development feasibility is not only a construction-cost exercise. Tax treatment can change the amount left in the deal. GST is one of the questions that needs to be raised before a student assumes a purchase price, sale price and profit margin.
The Australian Taxation Office explains that GST can apply to certain property transactions. The ATO also publishes specific guidance on GST and the margin scheme. Those pages are a starting point, not a substitute for advice on a particular project.
The decision you are really making
You are deciding whether the feasibility has used the correct tax assumption for acquisition and sale. A small subdivision, townhouse project or land resale can look profitable when GST is ignored or simplified. The result can change again depending on the entity, whether the seller is registered, the contract terms, whether the margin scheme can be used, and whether the product is new residential premises, vacant land or something else.
You are not expected to solve this yourself. Your job is to flag the tax question early and brief an accountant or tax adviser before contracts are signed. A property lawyer should also check that the contract reflects the intended GST treatment.
Practical GST feasibility checks
- Ask whether the purchasing entity is or should be registered for GST, using the ATO's GST registration guidance as a starting point.
- Ask whether the acquisition price is GST-inclusive, GST-exclusive or treated another way under the contract.
- Ask whether the margin scheme is available and whether it must be agreed in writing.
- Model sale proceeds after GST assumptions, selling costs and tax advice, not just gross revenue.
- Record the tax assumption beside the feasibility version so it is not forgotten later.
The ATO's property industry GST material shows why property transactions need specific attention. This is especially important where a student is comparing two sites with similar planning potential but different seller status, contract terms or exit product.
Common trap
The common trap is saying “we will sort GST later”. Later may be too late if the purchase contract, entity setup or pricing negotiation has already locked in the wrong assumption. A site can still be a good deal, but the numbers must carry the correct tax treatment from the start.
TPC deal lens
Before going unconditional, ask the tax adviser to confirm the GST position, margin-scheme availability, registration implications and how the assumption should be shown in the feasibility. Ask the property lawyer to confirm the contract wording supports that position. Then run the feasibility both ways if the answer is uncertain.
For joint ventures, the tax question also affects communication. A capital partner should be shown whether revenue and costs are presented before or after GST, what advice has been received and what assumptions still need confirmation. Clean wording protects trust because everyone can see which number is being discussed.
For a student, the discipline is to turn every uncertainty into a named assumption with evidence, owner, cost allowance and decision date. If that assumption changes the acquisition price, approval pathway, funding condition or exit value, it belongs in the feasibility before the commitment is made.
That written trail also helps the student avoid emotional buying. It shows whether the opportunity creates value through a tested system, or whether the numbers only work because a difficult item has been left vague. A good deal can survive scrutiny; a weak one usually depends on rushed assumptions.
Ask for the advice in writing and keep it with the feasibility pack so later project decisions use the same tax basis.
Key takeaway: GST is not a footnote. It is a feasibility input that should be checked before the price and exit strategy are trusted.
Student next step
You are not expected to solve this yourself. Brief an accountant or tax adviser to confirm GST registration, margin-scheme availability and sale-treatment assumptions, and a property lawyer to confirm the contract wording before exchange or unconditional commitment.
Sources and boundaries
Checked 8 October 2026. Sources are linked beside the relevant claims in the article body; key official sources are listed here for review.
- ATO — GST and property — ATO guidance on GST and property transactions.
- ATO — GST margin scheme — ATO guidance on the GST margin scheme.
- ATO — property and construction industry — ATO property industry GST information.
- ATO — GST registration — ATO guidance on GST registration.
This article is general education only and is not personal financial, legal, tax, planning, lending, building or engineering advice.
Frequently asked questions
What is the first decision this guide helps me make?
It helps you decide whether the issue is a genuine feasibility risk that should be checked before you rely on the deal numbers.
Can I assess this without a specialist?
You can screen the risk and ask better questions, but the site-specific technical answer should be confirmed by the relevant qualified specialist.
When should I raise this in the deal process?
Raise it before exchange or before the contract becomes unconditional, because the answer can affect price, conditions, timing and whether the project should proceed.
What should go into the feasibility?
Record the assumption, source, likely consultant cost, approval or delivery timing, contingency allowance and the decision that depends on the answer.
What is the common mistake to avoid?
Do not treat a promising address, headline yield or agent comment as evidence. Convert the issue into a written question for the right specialist.
Rate this article
How useful did you find this article? 1 is poor and 5 is great.
Join the conversation
Your email address will not be published.
Photo: RDNE Stock project, Pexels.
Loading comments…