What is an instalment activity statement in Australia?

Answer

An Instalment Activity Statement (IAS) in Australia is a form used by individuals and businesses to report and pay various tax and superannuation obligations, such as Pay As You Go (PAYG) instalments and PAYG withholding, to the Australian Taxation Office (ATO).

Australian Taxation Office (ATO)
Last Updated:May 6, 2026

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How it works in practice

What is an Instalment Activity Statement (IAS)?

An Instalment Activity Statement (IAS) is a simplified reporting form issued by the Australian Taxation Office (ATO). It is primarily used by individuals and businesses who need to report and pay certain tax obligations to the government more frequently than annually. This system ensures that tax is collected throughout the year, preventing a large, unexpected tax bill at year-end.

Who uses an IAS?

Typically, you will receive an IAS if you are registered for Pay As You Go (PAYG) instalments because you earn business or investment income, or if you have other specific obligations like PAYG withholding for employees or contractors, or Fringe Benefits Tax (FBT) instalments. The ATO will notify you if you are required to use an IAS and will issue the forms, usually monthly or quarterly, depending on your circumstances. For some small businesses, a Business Activity Statement (BAS) might consolidate these obligations.

Important exceptions

Not every individual or business is required to lodge an IAS. It is only issued to those who have specific tax obligations that need to be reported and paid in instalments throughout the year, such as PAYG income tax instalments or PAYG withholding for employees.

Individuals whose only income is from employment, where tax is already withheld by their employer, typically do not receive or need to lodge an IAS. Some larger businesses may instead use a Business Activity Statement (BAS) to report a broader range of tax obligations, including GST, alongside their PAYG instalments.

What you should do now

  1. Determine if you are required to lodge an IAS by checking communications from the ATO or your myGov account.

  2. Gather all necessary financial records, including income earned and any amounts withheld, for the reporting period.

  3. Lodge your IAS online via myGov, through your tax agent, or using ATO-approved accounting software by the due date.

  4. Pay any outstanding tax or superannuation amounts specified on your IAS by the due date to avoid penalties.

  5. Keep accurate records of all income, expenses, withholding amounts, and lodged statements for at least five years.

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