If you run a business in Australia, you’ve likely come across both BAS and IAS — but the difference between them isn’t always clear. Understanding what each one covers can help you stay organised and avoid last-minute stress around lodgement deadlines.
What Is a BAS?
A Business Activity Statement (BAS) is used by businesses registered for GST to report and pay several tax obligations at once, including GST, PAYG withholding and PAYG instalments, depending on how your business is set up.
What Is an IAS?
An Instalment Activity Statement (IAS) is generally used by businesses that aren’t registered for GST, or that need to report specific obligations — such as PAYG withholding — outside of the standard BAS cycle.
Why the Difference Matters
Lodging the correct statement, with accurate figures, depends on having your bookkeeping up to date throughout the period — not just before the due date. Reconciled accounts, organised payroll records and properly coded transactions all feed directly into an accurate BAS or IAS.
We provide BAS/IAS preparation support where appropriately authorised, helping ensure your figures are ready to go when it’s time to lodge.