The Government’s August Tax Bill proposes a rewrite of the GST treatment of unincorporated joint ventures (JVs). CA ANZ supports the overall direction of simplification but highlights several areas that require refinement to ensure the new rules are practical, certain, and commercially workable.

A new framework for flow-through treatment

The Taxation (Annual Rates for 2025–26, Compliance Simplification, and Remedial Measures) Bill introduces an elective flow-through joint venture regime, allowing some joint ventures to have the parties account separately for the GST.  The treatment would apply automatically to an “output-sharing” joint venture, and by election for others. The measure is designed to reduce duplication and better reflect how many commercial collaborations already operate.

Ordinary unincorporated JVs can continue to be treated as a single entity for GST purposes. Members can choose to register and account for GST collectively, simplifying invoicing and compliance.

CA ANZ supports the simplification intent but notes that the absence of a statutory definition of “joint venture” and the irrevocable nature of the single-entity election may create confusion, compliance risks, and rigidity over time.

Definition and scope

CA ANZ considers that a clear statutory definition of “joint venture” is needed to provide certainty and consistency for taxpayers and Inland Revenue. Without a definition, there is ambiguity at the boundary between joint ventures, partnerships, and cost-sharing arrangements, increasing the risk of misclassification and disputes.

Examples include doctors or accountants sharing clinic or office facilities whose combined activities may exceed the GST registration threshold even though they are not engaged in a joint commercial enterprise. Such overreach could impose unintended GST registration and compliance obligations on cost-sharing groups and discourage small businesses and professionals from collaborating efficiently.

CA ANZ recommends that the legislation include a specific definition of “joint venture”, supported by examples and guidance aligned with international practice, to ensure the regime operates as intended and applies only to genuine JVs.

Flexibility and commercial reality

Under the Bill, once a JV elects to be treated as a single entity for GST purposes, that election would be irrevocable except during the transitional period. CA ANZ considers this rigidity inconsistent with the commercial reality of joint ventures.

CA ANZ highlights that allowing JVs to revoke the single-entity election is essential to ensure the GST regime remains practical and flexible. In practice, the structure, membership, and activities of JVs can change significantly over time. Industries such as property development, minerals exploration, and infrastructure commonly form and dissolve JVs for specific projects, often with changes in membership or scope.

If the election cannot be revoked, JVs may be locked into a GST treatment that no longer suits their operations, forcing them to maintain registration or compliance obligations even after the venture ceases.

CA ANZ recommends that the legislation include a mechanism allowing revocation or variation of the election in genuine cases of commercial change, subject to appropriate safeguards. This approach would align the regime with international GST and VAT practice, where flexibility is recognised as essential for compliance and economic efficiency.

Registration threshold and cost-sharing arrangements

A proposed “total supplies” rule, which would require GST registration if the combined taxable supplies of the JV exceed $60,000 in a 12-month period, even if individual members remain below the threshold. While supporting the objective of maintaining integrity, CA ANZ warns that the rule could have unintended consequences.

The total supplies rule could impose GST obligations on small-scale collaborations or professional groups that are not operating as joint ventures. CA ANZ suggests that a safe harbour or explicit exemption should be included for genuine cost-sharing arrangements that do not amount to a joint venture.

Practical examples demonstrate how medical or professional groups sharing premises and administrative costs could be captured by the rule, creating unnecessary administrative burden and discouraging efficient business models. CA ANZ emphasises that distinguishing between cost-sharing and true joint commercial activity is critical to avoid overreach and compliance inefficiency. Again, a clear definition of “joint venture” would be helpful.

Implementation and guidance

Overall, the new regime poses a neat solution to a current practical issue. However, CA ANZ notes that successful implementation of the new regime will require comprehensive Inland Revenue guidance before the rules take effect. Detailed examples distinguishing JVs from partnerships and cost-sharing groups will be necessary to support compliance and reduce uncertainty for affected businesses.