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Quarterly BAS, IAS & Superannuation Guarantee

2 Mar, 2026

🧾 Quarterly BAS, IAS & Superannuation Guarantee

In Australia, many small to medium-sized businesses and employers report and pay their tax obligations on a quarterly basis. This includes:

  •      Business Activity Statements (BAS) — for GST and PAYG instalments
  •      Instalment Activity Statements (IAS) — for PAYG instalments or withholding (where not registered for GST)
  •      Superannuation Guarantee (SG) contributions — for employee super

📆 Quarterly Reporting Periods & Due Dates

Quarter Reporting Period Due Date
Q1 1 July – 30 September 28 October
Q2 1 October – 31 December 28 February
Q3 1 January – 31 March 28 April
Q4 1 April – 30 June 28 July
Important: If any of the due dates fall on a weekend or public holiday, the deadline is moved to the next business day.

📄 What Must Be Reported

1. BAS (Business Activity Statement):

  •       GST (Goods and Services Tax) collected and paid
  •       PAYG Instalments (business income tax prepayments)
  •       PAYG Withholding (if you withhold tax from employee wages)
  •      Other taxes (e.g. FBT instalments, luxury car tax if applicable)

2. IAS (Instalment Activity Statement):

  •      Used by businesses that do not report GST
  •      Primarily covers PAYG instalments and PAYG withholding

3. Superannuation Guarantee (SG):

  •      Employers must make SG contributions
  •      Due quarterly by the same dates as BAS
  •       Must be paid and received by the employee’s super fund by the deadline

⚠️ Penalties for Late Lodgment or Payment

  •      Failure to Lodge (FTL) penalty: From $313 per 28-day period late (per obligation), up to $1,565 for small businesses.
  •      Super Guarantee Charge (SGC): If SG is paid late, it becomes non-deductible and attracts interest and admin fees.
  •      General Interest Charges (GIC): Applied to late payments.

✅ Tips to Stay Compliant

  •      Use accounting software (like Xero, MYOB, or QuickBooks) to automate reminders and pre-fill BAS data.
  •      Ensure payroll systems are up to date for accurate SG and PAYG reporting.
  •      Lodge electronically for faster processing and confirmations.
  •      Work with a registered tax or BAS agent to gain extra time for lodgment if needed.

Details

Date:
2 Mar, 2026
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