BAS Due Dates 2025-26: Quarterly and Monthly Lodgment Deadlines
Last reviewed:
Primary tax-year context: 2025-26
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General information only. Speak with a registered tax or BAS agent for advice.
ATO quarterly BAS legislative due dates are 28 October, 28 February, 28 April, and 28 July. Monthly BAS is generally due on the 21st of the following month.
2025-26 checks
- Confirm your reporting cycle (quarterly, monthly, or annual)
- Check online lodgment extensions that may apply to your circumstances
- Reconfirm dates if weekends/public holidays apply
Sources (verified)
Next step
- Estimate BAS payable with the BAS Calculator
- Reconcile GST in the GST Calculator
- If BAS prep is exposing weak paperwork, standardise invoices and quotes in the branding-ready tools library
- If payroll records are part of the clean-up, use the payroll document hub