What is TFN (Tax File Number)?
The Tax File Number is a 9-digit personal tax identifier issued by the ATO. Every Australian taxpayer needs one to lodge tax returns, receive Medicare, and avoid having tax withheld at the top marginal rate (47%). Companies have a separate company TFN.
Example
A new employee provides their TFN to the employer on a TFN Declaration form, allowing PAYG withholding at the correct marginal rate rather than the no-TFN rate of 47%.
Related terms
The Australian Business Number is an 11-digit identifier issued to businesses by the Australian Business Register. Without an ABN, payers must withhold 47% from your invoice. Required for GST registration, business name registration, and most B2B trading.
Pay As You Go Withholding is the system Australian employers use to deduct tax from employee wages and remit to the ATO. Real-time reporting via Single Touch Payroll (STP) Phase 2 is mandatory at every pay event. Cash flow remittance is via BAS (quarterly or monthly).
Company Tax is the federal tax Australian companies pay on taxable income. The base rate is 25% for 'base rate entities' (turnover under A$50 million and ≤80% passive income). All other companies pay 30%. There is no separate state-level company tax.
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