Somewhere between running payroll, chasing invoices, and growing your business, tax compliance often gets pushed to “I’ll sort it later.” That works until later becomes overdue. Between BAS, superannuation changes, and evolving employer obligations, the 2026–27 financial year leaves little room for delay.
This guide is an actionable small business tax checklist designed for Australian business owners, covering every obligation, key deadline, and eligible deduction for the year ahead, so you always know where you stand.
7 Tax Checklists for Small Business Owners
1. Structure & Business Registrations
Getting these foundational Australian tax obligations right first ensures the rest of your Australian business tax checklist runs smoothly.
- Verify ABN Details: Ensure your Australian Business Number (ABN) is active and your Australian Taxation Office (ATO) details are fully up to date.
- Check GST Turnover: Registration is compulsory once gross turnover hits $75,000 ($150,000 for non-profits). Voluntary registration remains optional below this threshold.
- PAYG Withholding Setup: Confirm Pay As You Go (PAYG) withholding registration is active before paying employees or directors.
- Director ID & TFN Declarations: Confirm every company director has an active Director Identification Number, and that each staff member has lodged a Tax File Number (TFN) declaration.
- Review Entity Structure: Assess whether your operating structure (sole trader, company, or trust) remains tax-efficient given your current profit levels.
2. Key ATO Deadlines for 2026–27
This financial year tax checklist keeps every lodgment and payment date on your radar, so you avoid unnecessary ATO failure-to-lodge penalties.
| Obligation | Lodgment / Payment Deadline |
| TPAR (Eligible Industries) | 28 August 2026 |
| Q1 BAS (Self-Lodge) | 28 October 2026 |
| 2025–26 Income Tax Return (Self-Lodge) | 31 October 2026 |
| Q2 BAS (Self-Lodge) | 1 March 2027 |
| Q3 BAS (Self-Lodge) | 28 April 2027 |
| FBT Return (Year ending 31 March 2027) | 21 May 2027 |
| Q4 BAS (Self-Lodge) | 28 July 2027 |
| Monthly BAS | 21st day of the following month |
| Superannuation Guarantee | Due within 7 business days after each payday (Payday Super) |
Note: Lodging through a registered tax agent generally grants deadline extensions (e.g., Q1 BAS moves to 25 November 2026). However, no extension for Q2 BAS deadlines, regardless of lodgment method. Missing a date isn’t the end of the world, but the Failure to Lodge penalty increases every 28 days a return stays outstanding; it’s cheaper to flag a delay with the ATO early than to let it slide.
3. Record Keeping & Bookkeeping
Good business record keeping is what Australia’s tax system relies on. Maintain clear digital records weekly and this doubles as your own bookkeeping checklist Australia-wide, simplifying end-of-year tax preparation and maintaining complete compliance.
- 5-Year Retention Rule: Retain all financial records for a minimum of 5 years from when the document was created or the transaction was finalised (whichever is later).
- Separate Bank Accounts: Keep personal and business transactions strictly separate, especially for shared assets (vehicles, mobile plans, home office).
- Secure & Unalterable Storage: Use cloud accounting software that stores your records, locks them once entered, and keeps a running log of every change made to the file.
- Data Backups: Maintain accessible digital backups that can be produced on demand during an ATO review.
4. GST & Business Activity Statements (BAS)
Treat this as your quarterly BAS checklist Australia businesses can rely on, paired with a fast GST checklist Australia wide before every lodgment.
- Reconcile GST Accounts: Match GST collected against GST credits claimed across all transactions.
- Quarantine GST Funds: Transfer collected GST into a dedicated sub-account as earnings come in, rather than searching for funds at lodgment time.
- Verify Credit Eligibility: Double-check that GST-free purchases (like basic food items or fresh produce) and input-taxed supplies are not claimed as GST credits.
- Apportion Mixed-Use Expenses: Accurately split and log private vs. business use for motor vehicles, phones, and internet connections.
5. Payroll & Superannuation
This payroll tax checklist covers more than super; state-based thresholds catch growing businesses out just as often, so stay compliant with current payroll legislation on both fronts.
- Payday Super Alignment: Ensure your payroll software is configured to pay Superannuation Guarantee (SG) contributions within 7 business days of each pay run.
- Super Rate (12%): Confirm SG contributions are calculated at 12% across qualifying employee earnings.
- Monitor Contribution Caps: Keep track of employer and voluntary super contributions against annual limits ($32,500 concessional/$130,000 non-concessional).
- Review State Payroll Tax: Check whether expanding staff costs cross state-specific payroll tax exemption thresholds in the states where your workers operate.
6. Deductions, Asset Purchases & Tax Rates
Whether you’re working through a company tax checklist or filing as a sole trader, these business tax deductions Australia allows are where planning pays off — alongside applying the correct entity tax rate.
- Claim Operational Expenses: Deduct legitimate business expenses including rent, wages, insurance, utilities, marketing, software subscriptions, and professional fees.
- Small Business Income Tax Offset: Sole traders and partners with turnover under $5 million can access an offset of up to 16% (capped at $1,000), calculated via their individual return.
- Verify Instant Asset Write-Off Legislation: Confirm the legislative status of write-off thresholds before making major equipment purchases, as unpassed bills default back to general depreciation rules.
- Apply the Correct Entity Tax Rate:
- 25% for Base Rate Companies (turnover under $50M and passive income under 80%).
- 30% for all other companies.
- Individual Marginal Rates for sole traders and partnership distributions.
7. Pre-Lodgment Quality Checks
Run through this ATO compliance checklist before submitting returns; it’s the difference between routine admin and an avoidable review.
- Reconcile Bank Feeds: Verify every ledger entry against actual bank statements, invoices, and receipts.
- Confirm Lodgment Pathways: Ensure you know whether you are lodging self-managed or utilising registered tax agent extensions.
- Proactive ATO Communication: If facing cash flow issues or potential delays, contact the ATO or your registered tax agent before the deadline passes.
- Schedule Pre-EOFY Tax Planning: Book a dedicated tax planning review well before 30 June 2027 to implement legal tax-saving strategies.
5 Common Tax Pitfalls to Avoid
These are the small business tax compliance slip-ups that turn a routine lodgment into a drawn-out review:
✘ Claiming GST on Exempt Items: Attempting to claim GST credits on GST-free or input-taxed expenses.
✘ 100% Business Claims on Mixed Assets: Failing to record and factor out private-use percentages for motor vehicles and mobile devices.
✘ Using GST as Operational Cash: Spending collected GST instead of setting it aside in a dedicated tax reserve.
✘ Missing Payday Super Deadlines: Late super payments trigger the non-deductible Superannuation Guarantee Charge (SGC) penalty regime.
✘ Outdated Payroll Tax Assumptions: Overlooking state payroll tax obligations when hiring remote staff in other states.
Next Steps for Your Business
That’s the full EOFY checklist for businesses working toward 30 June 2027. Bookmark this page or keep a printed copy handy as a quick operational reference throughout 2026–27.
If you would prefer to have certified tax professionals manage your lodgments, schedules, and deductions, get in touch with ICS and let’s make sure your business stays fully compliant and optimised for the year ahead.
