Running a small business or sole trader setup in Australia means spinning multiple plates — from securing clients to delivering work. Once your annual revenue approaches the $75,000 GST threshold, tax compliance quickly climbs to the top of your priority list.
Filing your Business Activity Statement (BAS) on time keeps you compliant with the Australian Taxation Office (ATO) while protecting your cash flow. Here is what every Australian business owner needs to know about mastering their BAS and tax obligations.
1. When Do You Need to Register for GST?
In Australia, registering for Goods and Services Tax (GST) becomes mandatory when:
- Your gross business turnover (excluding GST) hits or is projected to hit $75,000 in a rolling 12-month period.
- You provide taxi, ride-sourcing (e.g. Uber) or limousine services — mandatory from your very first dollar earned.
If your turnover is below $75,000, registering is optional. Registering voluntarily allows you to claim GST credits on business setup expenses, provided you lodge regular activity statements.
2. Key Quarterly BAS Deadlines
Most small businesses lodge their BAS quarterly. Missing these dates triggers automatic Failure to Lodge (FTL) penalties starting at $330 per 28-day period for small entities.
| Quarter | Period Covered | Standard 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 |
Note: Working with a registered tax or BAS agent extends your lodgement deadlines for most quarters.
3. A Worked BAS Example for a Sole Trader
Say you invoiced $27,500 (including GST) this quarter and spent $5,500 (including GST) on tools, software and fuel:
- GST collected on sales: $27,500 ÷ 11 = $2,500 (label 1A)
- GST credits on purchases: $5,500 ÷ 11 = $500 (label 1B)
- Net GST payable to the ATO: $2,500 − $500 = $2,000
If you also pay yourself or employees wages, PAYG withholding is reported on the same BAS. Setting aside roughly 10% of every invoice into a separate account means the BAS payment is never a shock.
4. Top Tax Deductions Sole Traders Often Miss
Maximising legitimate claims reduces your total taxable income and GST liability:
Work From Home Running Costs
The ATO's fixed-rate method allows 70 cents per hour worked from home (covering electricity, gas, phone, internet and stationery), with mobile/computer hardware depreciation claimed separately.
Motor Vehicle Expenses
Track work-related travel using an ATO-compliant logbook for 12 continuous weeks to claim fuel, insurance and maintenance percentages.
Software & Subscriptions
Software like Xero, MYOB, Canva and operational tools are 100% tax-deductible.
5. Avoiding Common BAS Traps
Double-Dipping on Home Office
If using the 70c/hour fixed rate, you cannot claim phone or internet bills separately as they are bundled into the rate.
Missing Valid Tax Invoices
The ATO requires valid tax invoices for any purchase over $82.50 (GST inclusive) to claim GST credits.
Mixing Personal & Business Funds
Maintain a dedicated business bank account to keep reconciliation simple and audit-proof.
6. When to Hand It to a Registered BAS Agent
If BAS quarter means a lost weekend, or you're unsure whether your GST coding is right, it usually costs less to hand it over than to fix mistakes later. A registered BAS agent can prepare and lodge for you, review your GST transactions, and often secure extended lodgement deadlines.
MC TAXATION & BAS SERVICES is a registered BAS agent based in Seven Hills, helping sole traders across Blacktown and Greater Western Sydney. See our BAS agent services and pricing or book a free consultation.