Start with the business activity and structure
Before registering, identify whether the activity is carried on as a sole trader, partnership, company or trust. The structure affects legal responsibility, record keeping, tax returns, asset ownership and how profits are distributed. An Australian business generally needs an Australian Business Number if it is carrying on an enterprise and wants to interact with the tax system or issue tax invoices.
The ATO notes that some registrations are compulsory while others are optional. Businesses should assess whether they need:
- An ABN.
- GST registration.
- PAYG withholding registration when employing workers.
- Fringe benefits tax registration or reporting, where relevant.
- Payroll and superannuation systems for eligible employees.
GST registration and reporting
GST registration is generally required when GST turnover reaches the relevant registration threshold. Voluntary registration may also be available below the threshold. Once registered, the business must charge GST where applicable, maintain records, claim eligible input tax credits and lodge activity statements.
The ATO identifies quarterly reporting as a common cycle for businesses below the large-turnover threshold, while monthly reporting can apply to larger businesses or businesses that elect to report monthly. A voluntarily registered small business may be able to report annually if it satisfies the relevant conditions.
A practical example is a consulting business that begins the year below the GST threshold but signs a large contract in September. The owner should monitor projected turnover rather than waiting until the end of the financial year. The contract may change the registration analysis and the way invoices should be issued.
PAYG withholding and superannuation
An employer that begins employing staff must register for PAYG withholding and withhold the correct amount from salary and wages. It must also meet superannuation obligations for eligible employees. The ATO’s super guarantee information states that the general super guarantee rate is 12% for the period from 1 July 2025 to 30 June 2027, subject to the applicable rules and contribution base.
Super contributions are generally required at least quarterly. Employers should reconcile payroll reports, contribution payments and employee records before each payment deadline.
Updating registrations and closing correctly
The ATO states that businesses must generally notify it within 28 days when relevant ABN details change, such as an address, authorised contact, registration or cessation. Closing a business does not end all obligations immediately. The owner may need to lodge final activity statements, cancel registrations, settle tax debts and retain records.
Action checklist
- Review registration requirements before trading begins.
- Forecast turnover monthly for GST purposes.
- Use payroll software that tracks PAYG and superannuation.
- Reconcile activity statements to bank and accounting records.
- Notify the ATO promptly when business details change.
- Obtain advice before transferring assets or closing a company or trust.
Correct setup reduces the risk that a growing business will discover too late that it should have registered, withheld tax or paid superannuation earlier.