Why Do We Need to Lodge BAS Returns?
Legal Compliance Requirements
The primary reason businesses must lodge BAS returns is simple: it's the law. If your business is registered for GST, has employees, or meets certain turnover thresholds, the ATO requires you to submit regular BAS returns. This isn't optional – it's a fundamental part of operating a business in Australia.
GST Reconciliation
Your BAS is where you reconcile all the GST you've collected from customers (GST on sales) against the GST you've paid on business purchases (GST credits). This process ensures you're paying the correct amount of GST to the government – no more, no less.
Most small businesses (GST turnover under $10 million) use the Simpler BAS reporting method, which only asks for three GST labels: G1 total sales, 1A GST on sales and 1B GST on purchases. Businesses with GST turnover of $10 million or more use full reporting, which adds labels such as G2 (export sales), G3 (other GST-free sales), G10 (capital purchases) and G11 (non-capital purchases).
PAYG Obligations
If you have employees, your BAS includes your Pay As You Go (PAYG) withholding obligations. This covers the income tax you've withheld from employee wages and must remit to the ATO.
Business Transparency
The BAS system provides the ATO with visibility into your business operations, helping them understand your business activity levels and ensuring the tax system operates fairly for all businesses.
Why Timing Matters: The Critical Importance of Lodging on Time
Avoiding Penalties and Interest
Late BAS lodgements can attract a failure-to-lodge penalty of one penalty unit ($364 from 1 July 2026) for each 28 days (or part of 28 days) the BAS is overdue, up to five units ($1,820) for small businesses. The penalty is doubled for medium entities (GST turnover or assessable income of $1 million to under $20 million) and multiplied by five for large entities. Additionally, if you owe money, the general interest charge accrues daily on unpaid amounts.
Cash Flow Management
Timely BAS lodgement is crucial for cash flow planning. If you're entitled to a GST refund, late lodgement means delayed refunds. Conversely, if you owe money, knowing your obligations early allows for better financial planning.
Maintaining Good Standing with the ATO
Consistent on-time lodgement builds a positive compliance history with the ATO. This can be beneficial if you ever need to request payment plans, dispute assessments, or apply for certain business concessions.
Business Reputation
Unpaid tax can also affect your credit file. If your business has an ABN, owes $100,000 or more that has been overdue for more than 90 days and isn't engaging with the ATO to manage it, the ATO can report the debt to credit reporting bureaus, where lenders and suppliers can see it.
Who Needs to Lodge BAS Returns?
GST-Registered Businesses
Any business registered for GST must lodge BAS returns, regardless of size. This includes:
- Businesses with annual GST turnover of $75,000 or more
- Taxi and ride-sourcing drivers, regardless of turnover
- Businesses that choose to register for GST voluntarily
- Not-for-profit organisations with annual GST turnover of $150,000 or more
Employers
Businesses with employees must report PAYG withholding on an activity statement, even if they're not registered for GST (in that case it's an instalment activity statement rather than a BAS).
Other Obligations
Some businesses may need to lodge BAS returns for other reasons, including:
- Luxury car tax obligations
- Wine equalisation tax
- Fuel tax credits
- Fringe benefits tax (in some cases)
Understanding PAYG and BAS Timing
PAYG Withholding and BAS Integration
PAYG withholding amounts are paid by the same due date as your BAS. Your BAS includes a PAYG withholding section where you report total salary and wages at W1 and the tax withheld from them at W2 – if you use Single Touch Payroll, these labels are pre-filled from your STP reports, so check them against your payroll records. Small withholders (withholding $25,000 or less a year) report and pay quarterly; medium withholders ($25,001 to $1 million a year) report and pay monthly.
Payment Timing
Both your GST obligations and PAYG withholding amounts are generally due on the same date as your BAS lodgement. This integrated approach simplifies compliance by consolidating multiple tax obligations into a single reporting and payment process.
Instalment Activity Statements
Some businesses and individuals also pay PAYG instalments (advance payments of income tax on business and investment income) on their activity statement, due at the same time. Individuals and trusts are generally entered automatically when their latest return shows instalment income of $4,000 or more, tax payable of $1,000 or more and estimated (notional) tax of $500 or more. You either pay the ATO-calculated instalment amount (label T7) or work out your instalment by multiplying your instalment income (T1) by your instalment rate (T2), which gives T11. If you aren't registered for GST, you report instalments on an instalment activity statement (IAS) rather than a BAS.
The Consequences of Late Lodgement
Financial Penalties
The ATO doesn't take late BAS lodgements lightly. Penalties include:
- Failure to lodge on time: one penalty unit ($364 from 1 July 2026) for each 28 days or part of 28 days the BAS is late, up to $1,820 for small businesses, and two or five times that for medium and large entities
- General interest charge (GIC): charged daily on amounts paid late (11.51% a year for October–December 2026) and no longer tax-deductible from 1 July 2025
- Shortfall penalties: if your BAS understates what you owe, penalties of 25% to 75% of the shortfall can apply, depending on whether you were careless, reckless or intentional
Cash Flow Disruption
Late lodgement can severely disrupt your cash flow:
- Delayed GST refunds if you're owed money
- Accumulated interest charges if you owe money
- Potential ATO garnishee actions on bank accounts
Compliance Consequences
Repeated late lodgements can result in:
- Increased ATO scrutiny and potential audits
- Loss of certain concessions or payment plan eligibility
- Director penalty notices for company directors
- Potential legal action in extreme cases
Preparing Your BAS: A Quarterly Checklist
- Reconcile every account: match all business bank, credit card and loan transactions in your accounting software, and clear anything sitting in suspense or uncategorised accounts.
- Check the period: make sure sales invoices and supplier bills fall in the right quarter, which affects when GST is reported.
- Check GST coding on sales: GST applied to taxable sales, and GST-free sales coded as GST-free.
- Hold a tax invoice for every GST credit: you need one for any purchase over $82.50 (including GST) before you can claim the credit, and you can only claim the business share of a mixed-use purchase.
- Leave out non-deductible entertainment: you can't claim GST credits on entertainment that isn't tax-deductible, such as client lunches.
- Match payroll: W1 (wages) and W2 (tax withheld) should agree with your payroll and STP reports and your general ledger.
- Review, lodge, then pay: compare the figures with previous quarters for anything unusual, and remember that lodging and paying are separate steps.
When Are BAS Payments Due?
Standard Lodgement Dates
Most businesses lodge BAS returns quarterly, with standard due dates:
- Quarter 1 (July-September): Due 28 October
- Quarter 2 (October-December): Due 28 February
- Quarter 3 (January-March): Due 28 April
- Quarter 4 (April-June): Due 28 July
If a registered tax or BAS agent lodges your BAS electronically, you may get extra time for quarters 1, 3 and 4 (for 2026–27: 25 November 2026, 26 May 2027 and, subject to confirmation, 25 August 2027). Quarter 2 stays at 28 February. If a due date falls on a weekend or public holiday, you can lodge and pay on the next business day.
Lodging yourself? If you receive and lodge your quarterly BAS online (through ATO online services or SBR-enabled accounting software), you generally get an extra two weeks to lodge and pay for quarters 1, 3 and 4, for example 11 November instead of 28 October. The concession doesn't apply to quarter 2 or to monthly BAS, and the later due date appears automatically on your BAS.
Monthly Lodgement
Some businesses lodge monthly, typically those with:
- GST turnover of $20 million or more (monthly reporting is compulsory)
- A direction from the ATO – businesses with a history of late or incorrect lodgement or payment can be moved to monthly GST reporting for at least 12 months
- Businesses that choose monthly lodgement for cash flow reasons, such as regular GST refunds
Monthly BAS returns are due by the 21st of the following month.
The exception is December: a business with turnover up to $10 million that reports GST monthly and lodges electronically can generally lodge and pay its December BAS by 21 February instead of 21 January. Check the due date shown on your BAS, as not every business qualifies (for example, businesses registered for deferred GST).
Annual Lodgement
Businesses that are voluntarily registered for GST with GST turnover under $75,000 ($150,000 for not-for-profits) can elect to report and pay GST annually. The annual GST return is generally due 31 October, or 28 February if you aren't required to lodge an income tax return. Any PAYG withholding or PAYG instalment obligations are still reported during the year.
How to Lodge, Pay and Fix Your BAS
- Lodge online: sole traders can lodge through ATO online services via myGov, other businesses through Online services for business, or straight from SBR-enabled accounting software such as Xero or MYOB. A paper BAS can still be mailed.
- Use a registered agent: a registered tax or BAS agent can lodge for you and gets the extended due dates above.
- Pay by the due date: use BPAY (biller code 75556 with the payment reference number, or PRN, for your activity statement account), a debit or credit card online, or direct debit. BPAY payments can take up to 4 business days to reach the ATO, and the ATO stops accepting credit cards after 30 June 2027.
- Fix mistakes: many GST errors can be corrected on a later BAS, within the ATO's time and value limits; otherwise, revise the BAS for the original period. Revising a BAS can count as a voluntary disclosure, which may reduce penalties and interest.
- Need more time? If something like serious illness or a natural disaster stops you lodging, ask the ATO for a lodgement deferral before the due date. Requests are decided case by case, and a deferral to lodge doesn't defer payment.
How AWTS Streamlines Your BAS Process
Our Comprehensive BAS Service
At Australia Wide Tax Solutions, we don't just prepare your BAS – we provide a complete compliance solution. Our service includes:
- Quarterly BAS preparation and lodgement
- GST reconciliation and optimisation
- PAYG compliance management
- Cash flow planning and advice
- ATO correspondence handling
Why Choose AWTS for Your BAS Needs
Fixed Pricing Structure: Unlike many accounting firms, we offer transparent, fixed pricing. Our business BAS services start from $330 per BAS, with monthly packages from $350 for comprehensive ongoing support.
48-Hour Turnaround: By providing your bank files in CSV format, we process your BAS within 48 hours, ensuring you never miss a deadline.
Comprehensive Service: We require all four BAS returns for the year, plus your annual tax return – this integrated approach ensures consistency and maximises your tax position. Our small business accountants can also look after your payroll and Single Touch Payroll, tax planning before 30 June and your business structure.
Expert Knowledge: Our team specialises in various industries, including trades, medical professionals, ecommerce, and crypto businesses, ensuring industry-specific expertise for your BAS preparation.
Red Flags: When It's Time to Switch Accountants
Warning Signs Your Current Accountant Isn't Delivering
If you're experiencing any of these issues, it might be time to consider switching to AWTS:
Consistently Late Lodgements: If your accountant regularly lodges your BAS late, you're paying unnecessary penalties and interest.
Poor Communication: If you can't reach your accountant or get timely responses about your BAS obligations, you need better service.
Surprise Tax Bills: If your BAS consistently results in unexpectedly large payments without advance warning, your cash flow planning needs improvement.
Limited Industry Knowledge: Generic accounting advice doesn't work for specialised industries. You need an accountant who understands your specific business challenges.
Reactive Rather Than Proactive: If your accountant only contacts you when lodgements are due rather than providing ongoing advice and planning, you're missing opportunities.
Take Action Today: Don't Let Another BAS Deadline Catch You Off Guard
Why Acting Now Matters
Every BAS due date is a reminder of how critical these deadlines are to your business success. If you're reading this and feeling stressed about your BAS obligations, or if you're not confident your current accountant has everything under control, it's time to make a change.
What AWTS Offers That Others Don't
Guaranteed Service Standards: We process BAS returns within 48 hours and provide fixed pricing so you know exactly what to expect.
Industry Specialisation: Whether you're in trades, medical, ecommerce, or crypto, we have specific expertise in your industry's unique BAS requirements.
Comprehensive Compliance: We handle all four quarterly BAS returns plus your annual tax return, ensuring integrated tax planning and compliance.
Proactive Communication: Our automated follow-up systems keep you informed and ensure nothing falls through the cracks.
Done on time: We prepare and lodge ahead of the due date, so you never have to chase us.
Ready to Make the Switch?
Don't let another BAS deadline stress you out. Contact Australia Wide Tax Solutions today and experience the difference professional, specialised BAS management can make to your business.
Call us now: 0488 854 200 Visit our website: awts.net.au
Office: 58/20-40 Meagher St, Chippendale NSW 2008
Our Sydney office is open Monday to Friday, 9am to 6pm, and we offer online consultations for your convenience.
Remember, with AWTS, you're not just getting BAS compliance – you're getting peace of mind, expert advice and a registered tax agent who keeps your lodgements on track.
How do I get help with this from the ATO?
The ATO provides guidance through ato.gov.au, the Small Business Support Line (13 28 66), and Online Services for individuals and businesses. For complex situations, a registered tax agent provides advice tailored to your specific circumstances and professional indemnity protection. You can verify agent registration at the TPB register at tpb.gov.au.
What records do I need to keep for tax purposes in Australia?
Most tax records must be kept for five years from the date of lodgement or the date the transaction occurred, whichever is later. Records must be in English or convertible to English and must be sufficient to explain the income and deductions in your return. The ATO can request records at any time during the retention period.
When do I need a registered tax agent in Australia?
Consider a registered tax agent when your affairs involve multiple income sources, business activity, investment properties, capital gains, or overseas income. Agents extend your lodgement deadline, provide safe harbour protection, and take professional responsibility for the advice given. Verify registration at tpb.gov.au.
How does the ATO calculate penalties for compliance failures?
The failure to lodge penalty is based on penalty units ($364 per unit from 1 July 2026), accruing per 28-day period for late returns and BAS lodgements. Incorrect information penalties range from 25% to 75% of the tax shortfall depending on whether the behaviour was careless, reckless, or intentional. Proactive disclosure before an audit begins typically results in significantly reduced penalties.
What is the difference between tax avoidance and tax minimisation?
Tax minimisation is the legal arrangement of your affairs to reduce tax — claiming all eligible deductions, using appropriate structures, and timing income and expenses. Tax avoidance involves arrangements that technically comply with the law but achieve outcomes parliament did not intend. The ATO can apply Part IVA anti-avoidance rules to cancel benefits from avoidance arrangements.
