Australian Tax and BAS Assistance: A Guide for Small Business Owners

Australian tax obligations for small businesses are manageable — but only if you understand what’s required and stay on top of it consistently.

The businesses that get into trouble with the ATO are almost never the ones that tried to cheat. They’re the ones that got busy, let their bookkeeping slide, and suddenly found themselves months behind on lodgements with penalties accumulating.

Here’s a clear guide to what Australian small businesses actually need to do — and when.

 

The Key Tax Obligations for Australian Small Businesses

GST registration and BAS

If your annual turnover reaches or is likely to reach $75,000 (or $150,000 for non-profit organisations), you must register for GST. Once registered, you charge 10% GST on most sales, claim credits on GST-inclusive purchases (input tax credits), and reconcile the difference in your BAS.

BAS is lodged quarterly for most small businesses:

• Q1 (July–September): due 28 October
• Q2 (October–December): due 28 February
• Q3 (January–March): due 28 April
• Q4 (April–June): due 28 July

If you use a registered BAS agent, these deadlines can often be extended. Working with a professional means you’re less likely to miss them.

PAYG withholding

If you have employees, you must withhold income tax from their wages (PAYG withholding) based on the ATO’s tax tables. This is reported through Single Touch Payroll in real time and paid to the ATO — usually monthly for most small businesses.

Failing to withhold correctly or pay on time triggers Director Penalty Notices, which can make company directors personally liable for the unpaid amount. This is not a consequence to take lightly.

Superannuation

The Superannuation Guarantee rate for 2025–26 is 11.5%. Super must be paid to the employee’s nominated fund — not just processed internally.

From 1 July 2026, Payday Super changes this significantly: super must be paid alongside wages with every pay run, not quarterly. This is one of the most significant payroll compliance changes for Australian employers in years.

Income tax

Sole traders report business income on their personal tax return. Companies lodge separate company tax returns. The small business tax rate for companies with a turnover below $50 million is 25% for the 2024–25 year.

For sole traders, the marginal rate applies to business income — which means effective tax planning (timing of income and expenses, super contributions, and correct deduction claims) matters more as income grows.

Record-keeping

The ATO requires businesses to keep records for at least five years. This includes invoices, receipts, contracts, bank statements, payroll records, and super payment receipts.

Cloud-based accounting software like Xero makes this straightforward — transactions are recorded automatically, receipts can be attached digitally, and reports are available instantly.

 

Common BAS and Tax Mistakes Australian Small Businesses Make

Mixing personal and business finances

Using the same bank account for business and personal transactions makes reconciliation a nightmare and increases the risk of claiming personal expenses as business deductions — which is both an error and a compliance risk.

Claiming GST credits they’re not entitled to

Not all purchases include GST. Wages, bank fees, and certain insurance products are GST-free. Claiming credits on these inflates your refund incorrectly and increases your audit risk.

Missing super payment deadlines

Super must be received by the fund by the lodgement deadline — not just processed. Banks and super funds have processing times. Initiating a super payment on the due date often means it’s received late.

Not reconciling regularly

Waiting until BAS time to reconcile several months of transactions is the fastest way to make errors. Monthly reconciliation — or better, weekly — means your books reflect reality and BAS lodgement becomes a 30-minute task rather than a full-day scramble.

 

Getting Help With Australian Tax and BAS

At Ease, we manage BAS preparation and lodgement as part of our accounting plans — monthly Xero reconciliation, GST reporting, PAYG withholding, and complete BAS lodgement.

Our Compliance plan starts from $700/month and is built specifically for Australian small businesses that want their obligations handled properly without the cost of a full-time finance resource.

If your books aren’t up to date, we can also help with historical catch-up bookkeeping — bringing your records current before your next lodgement.

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