Introduction
Australian businesses rarely face just one tax deadline. Between annual returns, BAS, PAYG, super, FBT and contractor reporting, a single missed ATO date can trigger penalties, interest and a nasty cash-flow squeeze.
Dates also get mixed up easily. Some obligations fall due during calendar 2026. Others belong to the 2025-26 financial year but are lodged later, sometimes in 2027.
This guide covers annual returns by entity type, BAS and PAYG, payroll reporting, super, FBT, extensions and what to do after a missed deadline. Confirm your own final dates with the ATO or your registered tax agent.
Key Takeaways
- Your deadline depends on entity type, accounting period, registrations and agent arrangements.
- Annual returns, BAS, PAYG, super, FBT and TPAR each run on separate calendars.
- Payday Super starts 1 July 2026 and changes how super timing works.
- Extensions to lodge may not move every payment date, so keep cash ready.
Identify Your Filing Profile First
The 2025-26 financial year runs 1 July 2025 to 30 June 2026. A return for that year is lodged after 30 June, and for some entities not until 2027.
Several factors change your dates:
- Entity type: sole trader, partnership, trust, company or foreign company
- GST and PAYG registrations, and your reporting frequency
- Accounting period, including substituted periods
- Whether a registered tax agent lodges for you
- Whether you have employees or contractors
Skip generic online calendars. Cross-check the ATO's business due-date pages, your agent's lodgement program and the page for each obligation. Your BAS also shows its own lodgement and payment date.
Weekend and public-holiday dates move to the next business day. For example, 31 October 2026 is a Saturday, so the effective date is 2 November 2026.
Annual Income Tax Return Deadlines by Business Structure
Sole Traders and Individual Businesses
Sole trader business income goes in the owner's individual return. The self-lodged date for 2025-26 is nominally 31 October 2026, adjusted to 2 November. Engage a registered practitioner before 31 October to be considered for later program dates.
Keep the return separate from other obligations. BAS, PAYG instalments and any tax payable run on their own dates, so a lodged return does not mean everything is done.
Companies and Foreign Companies
Company dates depend on accounting period, circumstances and the lodgement program. Under the current ATO program:
- Small self-lodged companies: generally 28 February, though outstanding prior returns can bring lodgement forward to 31 October
- Agent-lodged, FY2025-26: nominal 31 March 2027 for the prior-year income-over-$2M category, and 15 May 2027 for remaining clients
- Large or medium taxable companies (total income over $10M): payment 1 December 2026, nominal lodgement 31 January 2027
- Companies with overdue prior returns: lodgement 31 October 2026, payment 1 December 2026
- Substituted accounting periods: lodge by the 15th day of month 7 after period-end; pay on the first day of month 6
The 2027 dates concern FY2025-26 returns, not calendar-2026 deadlines. Check the date recorded for your company.
An ATO company return is also separate from ASIC's annual review. ASIC's annual review follows the incorporation anniversary, with fees usually due within two months. The ordinary proprietary company fee is $329, rising to $342 from 1 July 2026.
Foreign-owned or non-resident companies should check residency, Australian-source income, withholding and international dealings schedule requirements. Cross-border rules are complex, so take qualified advice.
Partnerships and Trusts
Self-lodged partnership and trust returns are nominally due 31 October 2026, adjusted to 2 November.
Agent-lodged trusts for FY2025-26 generally have 15 May 2027, with earlier dates such as 31 March 2027 where the latest return's liability was at least $20,000 (excluding large or medium trusts). Partnership agent lodgement dates vary by client, so use the date assigned to you.
Partners and beneficiaries often need financial statements and distribution details before they can finish their own returns. The entity's date and each owner's personal date can differ.
Trustees should resolve beneficiary entitlements by 30 June, or earlier if the trust deed requires. From 1 July 2026, closely held trusts report beneficiary TFNs through the annual return, though no-TFN withholding obligations remain.
Recurring Business Tax and Employer Obligations in 2026
BAS, GST and PAYG Instalments
Standard quarterly BAS lodgement and payment dates:
| Period | Due |
|---|---|
| October-December 2025 | 28 February 2026 |
| January-March 2026 | 28 April 2026 |
| April-June 2026 | 28 July 2026 |
| July-September 2026 | 28 October 2026 |
- Monthly BAS is due on the 21st of the following month, and is generally mandatory at GST turnover of $20M or more.
- Eligible online quarterly lodgers may get two extra weeks, except for the December quarter.
- Annual GST reporting suits voluntarily registered businesses under $75,000 turnover ($150,000 for not-for-profits). It is normally due 31 October, or 28 February if no income tax return is required.
- Quarterly PAYG instalments follow the same 28 October, February, April and July pattern. Monthly instalments fall on the 21st.
These are standard dates, not every client's final date. Your BAS shows yours.
PAYG Withholding, Payroll and Single Touch Payroll
Withholding frequency depends on annual withholding:
- $25,000 or less: quarterly
- Over $25,000 to $1M: monthly
- Over $1M: electronic payment within 6-8 days of the withholding event
Standard STP finalisation for 2025-26 is 14 July 2026. If you cannot meet it, seek a deferral.
Employers who cannot report through STP generally lodge payment summary annual reports by 14 August, or 30 September through an agent (excluding large withholders). Employees' own return deadlines are separate.
Super Guarantee Payments
Quarterly SG for earnings through 30 June 2026 is due 28 January, 28 April and 28 July 2026. Allow processing time so money reaches the employee's fund on time.
From 1 July 2026, Payday Super applies. SG is payable each payday, generally received by the fund within seven business days, at 12%.
Do not treat 28 October 2026 as the ordinary September-quarter deadline. Under the ATO's example, a 6 July payday has a 15 July receipt deadline, while June-quarter contributions remain due by 28 July. CA ANZ warns of transition cash-flow pressure.
Late, insufficient or wrong-fund quarterly payments require a super guarantee charge statement, generally within a month of the deadline. The charge includes the shortfall, 10% interest and $20 per employee per quarter in administration fees, and it is not deductible.
Fringe Benefits Tax
The FBT year ran 1 April 2025 to 31 March 2026. The return and payment are due 21 May 2026, generally 25 June for electronic agent lodgement where the client relationship exists by 21 May.
FBT depends on benefits provided to employees or associates, even if there is no income tax liability. Registered employers who need not lodge should give a non-lodgement notice.
TPAR and Conditional Obligations
The Taxable Payments Annual Report is due 28 August 2026. It covers building and construction, cleaning, courier and road freight, IT, and security, investigation and surveillance services. It is conditional, not universal. Foreign-resident withholding reports and industry-specific returns are also conditional.
Extensions, Tax Agents and Missed Deadlines
Registered Tax Agents and Extensions
An agent's lodgement program can give you a later lodgement date, but only if you supply records on time. An agent arrangement does not remove every obligation. Instalment notices, for example, do not automatically receive agent extensions.
Do not assume an automatic extension exists. ATO-assessed relief looks at exceptional circumstances outside your or your agent's control. A single universal disaster extension date is not published, so check current ATO guidance for any relief that applies to your situation.
Lodgement Versus Payment
Approved agent-assessed deferrals generally extend payment as well, except for individual and trust returns and FBT. Still, plan on the original payment date unless the ATO confirms otherwise.
- Estimate your liability early
- Preserve cash for the original due date
- Confirm any arrangement in writing with the ATO or your adviser
What Happens After a Missed Deadline?
Act quickly:
- Lodge or pay as soon as possible
- Contact the ATO where needed
- Keep evidence of why the delay happened
- Ask about remission or a payment plan
The failure-to-lodge penalty is one penalty unit per 28 days or part thereof, capped at five units, with higher multipliers for medium and large withholders and significant global entities. A penalty unit is $330 until 30 June 2026 and $364 from 1 July 2026.
General interest charge for October-December 2026 is 11.51% annually. Payment plans are available, but GIC generally continues. Remission is discretionary and considers your responsibility for the delay and compliance history.
2026 Business Tax Deadline Preparation Checklist
Build a Compliance Calendar
List every annual and recurring obligation with:
- The responsible person
- An internal preparation date
- The official due date and payment date
- Confirmation of successful lodgement
Set reminders ahead of each date. Review the calendar whenever your structure, registrations, staff numbers, turnover or accounting period changes.
Prepare Records Early
Gather these before each deadline:
- Bookkeeping reconciliations and bank and payment-platform records
- Invoices, receipts and asset registers
- Payroll and super records, with STP reconciled to super evidence
- GST coding, contractor details and foreign transactions
- Trust or partnership distribution information
Most business records must be kept for five years. Clean records prevent rushed lodgement, missed deductions and incorrect BAS figures.
Consider Professional Support
Australian businesses that need extra capacity may look to VJM Global for:
- Outsourced bookkeeping and financial reporting
- Tax compliance support
- Coordination of Australia–India business records
VJM Global has 30+ years of experience and has served 250+ Australian businesses. Professional support does not replace confirming your own ATO obligations.
Frequently Asked Questions
When can I lodge my 2026 tax return and what are the key filing dates?
The 2025-26 financial year ends 30 June 2026, and returns are lodged afterwards. Self-lodged sole traders, partnerships and trusts are nominally due 31 October, adjusted to 2 November 2026. Check the ATO or your agent for your structure.
What is the filing deadline for company tax returns in Australia for 2026?
It depends on accounting period, circumstances and lodgement program. Self-lodged small companies generally have 28 February, while agent clients may have dates in 2027. Verify your recorded date.
What is the deadline for a partnership tax return in 2026?
Self-lodged partnership returns are nominally due 31 October, adjusted to 2 November 2026. Agent-lodged dates vary by client, and partners' individual return dates may differ.
Can I lodge a 2026 company tax return early?
Often yes, once accounts and required information are complete. It depends on ATO systems, forms and your agent's process.
What happens if I don't lodge my tax return by the ATO deadline?
You may face failure-to-lodge penalties and interest on unpaid tax. Lodge promptly or contact the ATO or a tax professional.
What are the key changes to tax rules for the 2026 tax year?
Payday Super starts 1 July 2026, and GIC and SIC incurred from 1 July 2025 are not deductible. The $20,000 instant asset write-off applies for 2025-26 for businesses under $10M turnover. Trust TFN reporting also changes from 1 July 2026.
