The BAS Breakdown 2026: GST on Sales and Purchases

Move from theory to practice with how to assess sales and purchases, apportion private use, and confirm when GST can be claimed.

In this session, we cover:

• A practical framework for determining whether a sale is taxable

• Conditions for claiming a GST credit

• Tax invoice requirements and supporting evidence

• Purchases with no claimable GST: wages, super, loan principal, interest, tax payments and unregistered suppliers

• Business and private apportionment

• Mixed invoices with GST and non-GST components

• Income tax deductibility vs GST credit entitlement

• Special scenarios: motor vehicles, entertainment and contractors

• Luxury car tax and the car limit

• The relationship between profit and PAYG instalments, and when instalments can be varied

• Responsibilities as a tax or BAS agent

• Practical applications: review expense claims and invoices, identify the evidence required and calculate any GST credit