What You Need to Know About Australia Tax Forms

With Single Touch Payroll reports going out every pay run, quarterly BAS lodgements, and an annual company tax return, a small Australian business with two employees can easily face 30-plus ATO submissions a year. Nearly all of it is digital, and the ATO's penalty for a single late BAS starts at $313 per 28-day period. This post breaks down every form, what it covers, and when it is due so nothing slips through the cracks.

1. What are Australian tax forms?

Australian tax forms are the official documents and electronic reports you use to report income, deductions, and tax liabilities to the ATO (Australian Taxation Office). Each form serves a specific purpose depending on your business structure and obligations. The main business tax forms are:

BAS (Business Activity Statement) - Reports GST, PAYG withholding, and PAYG instalments
STP (Single Touch Payroll) - Reports payroll data to the ATO each pay run
Company Tax Return - Reports company income and calculates tax owing
Individual Tax Return - Used by sole traders to report business income

Most reporting is now done electronically through the ATO's online services or STP-enabled software.

2. Who does it apply to?

This usually applies to:

All registered businesses (BAS, if registered for GST or PAYG)
All employers (STP reporting)
Companies and corporate entities (Company Tax Return)
Sole traders and self-employed individuals (Individual Tax Return with business schedule)
Trusts and partnerships (Trust Tax Return or Partnership Tax Return)
Businesses paying dividends or interest (Annual Investment Income Report)

3. Why does it matter?

Understanding tax forms helps you:

Stay compliant with the ATO and meet all reporting obligations
Avoid failure-to-lodge penalties and interest charges
Keep proper records to support your lodgements
File and pay correctly using the right form for your business type
Plan your cash flow better by knowing what is due and when

4. How does it work?

Here's the basic process:

Identify which tax forms apply to your business based on your structure and registrations
Keep accurate records throughout the year to support each lodgement
Use ATO-approved or STP-enabled software to prepare and submit your forms
Lodge each form by the relevant deadline
Pay any tax due by the associated payment deadline
Keep copies of all lodged forms and supporting records for at least 5 years

5. What forms are involved?

BAS (Business Activity Statement) - Lodged monthly or quarterly to report GST collected, GST credits claimed, PAYG withholding, and PAYG income tax instalments. This is the most frequently lodged form for most businesses
STP Report (Single Touch Payroll) - Submitted to the ATO every pay run. Reports employee wages, tax withheld, superannuation, and other payroll details in real time
STP Finalisation - An annual declaration submitted by 14 July to confirm that all STP data for the financial year is complete. Replaces the old PAYG payment summaries
Company Tax Return - Lodged annually to report your company's taxable income, deductions, and tax payable. Due 31 October for self-lodgers or later if using a tax agent
Individual Tax Return (with Business Schedule) - Used by sole traders to report business income. Includes a separate business and professional items schedule
Partnership Tax Return - Lodged by partnerships to report partnership income and its distribution among partners
Trust Tax Return - Lodged by trusts to report trust income and its distribution to beneficiaries
Taxable Payments Annual Report (TPAR) - Required for businesses in certain industries (building, cleaning, courier, IT, security) that make payments to contractors. Due 28 August each year
Franking Account Return - Required for companies with franking account transactions or a franking deficit

6. What information do you need?

Before handling tax forms, make sure you have:

ABN, TFN, and ATO registration details
Financial records and bank statements for the income year
Employee payroll records (wages, tax withheld, super contributions)
GST records (sales, purchases, input tax credits)
Depreciation and asset schedules
Details of any capital gains or losses
Records of payments to contractors (for TPAR)
Access to the ATO Business Portal, myGov, or your tax agent portal

7. Important deadlines

BAS (quarterly): Due 28 days after the end of each quarter. Q2 deadline is 28 February
BAS (monthly): Due on the 21st of the following month
STP report: Each payday (submitted via payroll software)
STP finalisation: 14 July following the end of the financial year
Company Tax Return (self-lodger): 31 October
Company Tax Return (tax agent): Varies, typically February to May
Individual Tax Return (self-lodger): 31 October
TPAR: 28 August each year
Franking Account Return: Due with the company tax return or by 31 October

8. Common mistakes to avoid

Missing different deadlines for different forms (BAS, STP, and annual returns all have separate due dates)
Not finalising STP by 14 July, which delays employee tax return processing
Lodging BAS with errors in GST calculations
Failing to lodge a TPAR when required (penalties apply per contractor not reported)
Not keeping records for the required 5-year retention period
Using non-compliant software for STP reporting
Overlooking the Franking Account Return when dividends have been paid
Not reconciling BAS figures to your annual company tax return

9. Simple example

You run a small company in Australia with two employees and are registered for GST. Your income year ends 30 June 2026.

Your annual filing obligations:

STP reports: Submitted each payday (for example, 26 fortnightly reports per year)
STP finalisation: 1 lodgement, due 14 July 2026
BAS (quarterly): 4 lodgements per year
Company Tax Return: 1 lodgement, due 31 October 2026
TPAR: 1 lodgement, due 28 August 2026 (if you pay contractors in a reportable industry)

Total ATO lodgements per year: At least 32 lodgements (26 STP + 1 STP finalisation + 4 BAS + 1 Company Tax Return), plus TPAR and other forms as needed.

10. FAQ

Q: Which form do I need if I am a sole trader? A: You lodge an Individual Tax Return and include the business and professional items schedule. If registered for GST, you also lodge a BAS. If you have employees, you also lodge STP reports.

Q: Do I still need to give employees payment summaries? A: No. If you report through STP, the ATO makes income statements available to your employees through myGov. You just need to finalise your STP data by 14 July.

Q: Can I lodge all my forms through one system? A: Most forms can be lodged through the ATO Business Portal or through your accounting and payroll software. STP reports go through your payroll software automatically.

Q: What happens if I lodge late? A: The ATO charges a failure-to-lodge penalty of one penalty unit ($313) for each 28-day period the form is overdue, up to a maximum of 5 periods ($1,565). Interest also applies to any unpaid amounts.

Q: How long do I need to keep my tax records? A: The ATO requires you to keep business records for at least 5 years from the date you lodge your return (or from the date the return was due, whichever is later).

11. Final takeaway

Australian businesses typically need to lodge BAS for GST and PAYG, STP reports for payroll, and a Company Tax Return for annual income tax. Most reporting is electronic. Know your deadlines, use ATO-compliant software, and keep records for at least 5 years.

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What you need to know about Australia tax forms: BAS for GST and PAYG, STP for payroll, Company Tax Return for annual income, and TPAR if you pay contractors. Lodge on time to avoid ATO penalties.

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