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Instructions for completing your BAS

Use these detailed instructions to help you complete your business activity statement for GST.

Last updated 14 September 2026

When completing your BAS, you should:

  • check your reporting period
  • leave labels blank if they don’t apply to you, unless otherwise instructed. Don't enter N/A or nil.
  • round down to whole dollars (don't show cents)
  • don’t report negative figures or use symbols such as +, ÷$.

Work through each step to complete a full reporting method BAS.

If you are using the:

  • calculation worksheet method – complete all steps
  • accounts method – complete steps 1, 3, 5 and 6.

How to complete labels G1 to G3 of your BAS.

How to complete labels G4 to G9 of your business activity statement.

How to complete labels G10 and G11 of your business activity statement.

How to complete labels G12 to G20 of your business activity statement.

How to complete the summary at the end of your BAS.

What you should check before lodging your BAS to ensure quick processing.

Access information about GST for less common transaction to help you complete your BAS.

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