When a business operates through multiple related entities — a company, a trading trust, and a holding entity, for example — the volume of GST compliance work can multiply quickly. Each entity may need to register for GST, file separate BAS forms, and account for the GST on sales between related parties. GST grouping is the ATO mechanism that allows commonly controlled entities to consolidate into a single GST group, file one BAS through a representative member, and treat internal transactions as though GST does not apply.
Understanding how GST grouping works, its eligibility requirements, and its practical bookkeeping implications is valuable for any bookkeeper working with multi-entity client structures.
What Is a GST Group?
A GST group is a formal arrangement under the GST Act where two or more entities that meet the eligibility criteria elect to be treated as a single entity for GST purposes. One entity is nominated as the representative member — it lodges the consolidated BAS on behalf of the whole group, holds the group's GST input tax credits and liabilities, and is responsible for payment.
The primary benefit is simplicity. Instead of multiple BAS forms covering the same underlying economic activity and the internal flows of money between related parties, there's one return reflecting the group's net GST position on transactions with external parties.
Eligibility Requirements
To form a GST group, entities must satisfy several conditions under the GST Act:
Common control: All entities must be connected. For companies, this means at least 90% of the voting shares must be held directly or indirectly by a single entity or a set of entities with the requisite cross-ownership. For trusts, the test focuses on beneficial ownership. Partnerships can also be included if the partners meet the ownership tests.
GST registration: All entities in the proposed group must be registered for GST or eligible to be registered.
Same tax periods and accounting basis: All entities must use the same GST tax periods (monthly or quarterly) and the same GST accounting basis (cash or accruals) — or be willing to align them on joining.
Australian nexus: All entities must be Australian residents or carry on an enterprise in Australia.
The ATO has a GST grouping notification form (available through the ATO's online business portal) that the representative member must complete. Grouping takes effect from the date notified to the ATO — it cannot be backdated.
Inter-Entity Transactions Are Not Taxable Supplies
The most significant bookkeeping implication of GST grouping is that transactions between group members are disregarded for GST purposes. If the trading trust pays a management fee to the holding company, that transaction does not create a taxable supply — no GST is added, no tax invoice is required, and there's no input tax credit for the recipient to claim.
This simplification is particularly valuable for groups with high volumes of intercompany transactions: loans, recharges, rent between entities, or shared services arrangements. Without grouping, each of these creates GST compliance obligations. Within the group, they're ignored.
From a bookkeeping perspective, intercompany accounts still need to be tracked for financial reporting and loan disclosure purposes — the GST elimination just means there's no GST component to account for in those transactions.
BAS Consolidation and the Representative Member
The representative member takes on all the GST rights and obligations of the group. This means:
- The representative member lodges one BAS covering all group entities
- All ITCs are claimed by the representative member
- All GST collected (on external sales) flows through the representative member's BAS
- Payment of net GST is the representative member's obligation
For the bookkeeper managing the group, the practical process is to prepare consolidated figures from each entity's accounts, strip out intercompany GST, and prepare a single BAS from the external-facing numbers. Accounting software with consolidated reporting — or careful manual aggregation — is needed.
Joint and Several Liability: The Key Risk
GST grouping concentrates compliance obligations in the representative member but does not eliminate the underlying liability of group members. All entities in the group are jointly and severally liable for the group's GST obligations. If the representative member fails to remit GST, the ATO can pursue any group member for the full amount.
This matters in practice where entities in a group are separately owned by different trusts or individuals who may not all have the same level of insight into the group's GST compliance. A passive investor who owns shares in one group entity can find themselves exposed to the GST liability of a trading entity they had no involvement in managing.
When GST Grouping Is and Isn't Appropriate
GST grouping works well for tightly held structures where all entities are under unified management and there's meaningful volume of intercompany transactions creating BAS compliance overhead. It's less suitable for groups where entities have different accounting periods, different cash/accruals bases, or where the liability exposure is a concern.
Joining or leaving a GST group is also administratively significant — changes must be notified to the ATO and the effective date affects how transitional supplies and credits are handled. Any reorganisation of a client's group structure should flag GST grouping implications to the supervising tax agent or GST adviser before entities are added or removed.