
Quarterly BAS, IAS & Superannuation Guarantee
28 Apr, 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.