Tax File Number Declaration: What You Need to Know

What Is a Tax File Number (TFN)?

A Tax File Number is a unique 9-digit identifier issued by the Australian Taxation Office (ATO) to individuals and organisations. It is used to manage tax and superannuation obligations within the Australian tax system.

Every Australian resident who earns income should have a TFN. It is used by:

• Employers — to calculate the correct PAYG withholding
• Banks — to determine withholding on interest income
• The ATO — to track income, deductions, and tax obligations
• Super funds — to apply the correct tax rates to contributions

The TFN Declaration Form (NAT 3092)

When a new employee starts work, they must complete a TFN declaration form (ATO form NAT 3092) and give it to their employer. The employer must then submit this form to the ATO within 14 days.

The TFN declaration form collects the following information:

Section A: Employee Details

• Full name
• Date of birth
• Home address
• TFN (or reason for not providing one)

Section B: Employment Basis

• Full-time, part-time, casual, or holiday maker
• Whether the employee is an Australian resident for tax purposes

Section C: Tax-Free Threshold

The employee declares whether they want to claim the tax-free threshold ($18,200) from this employer. Key rules:

• Only one employer can apply the tax-free threshold
• If the employee has multiple jobs, they should claim it from the employer who pays them the most
• Claiming the tax-free threshold reduces the PAYG withheld from each pay

Section D: Study and Training Loans

The employee must declare if they have any of the following debts:

• HECS-HELP
• FEE-HELP
• VET Student Loan
• Student Financial Supplement Scheme (SFSS)
• Student Start-up Loan (SSL)
• Trade Support Loan (TSL)

If they declare a study loan, the employer must withhold additional PAYG to cover estimated repayments.

Section E: Tax Offsets

The employee can declare if they are entitled to:

• Senior Australians and pensioners tax offset
• Zone or overseas forces tax offset

What Happens If an Employee Does Not Provide a TFN?

If a new employee does not provide their TFN on the declaration form, or does not complete the form at all, the employer must withhold PAYG at the top marginal rate of 47% (45% tax + 2% Medicare levy) from the very first payment.

This is a deliberately punitive rate designed to incentivise employees to provide their TFN. Here is the impact:

Example: Employee earning $1,500 per week gross

That is a difference of $422 per week — the employee takes home barely half their pay.

Legitimate Reasons for Not Having a TFN

Employees can state on the form that they:

• Have applied for a TFN but not yet received it
• Are under 16 and earn less than $350 per week
• Are a recipient of certain government pensions or benefits

If an employee has applied for a TFN, the employer can withhold at normal rates for 28 days. If the TFN is not provided within 28 days, the employer must revert to the 47% rate.

Employer Obligations

Collecting the TFN Declaration

• Provide the form to the employee on or before their first day of work
• The employee should return it before the first payment is made
• Submit the completed form to the ATO within 14 days of receipt (via STP or paper)

Handling TFNs Securely

TFNs are sensitive personal information protected by the Privacy Act 1988 and the Taxation Administration Act 1953. Employers must:

• Never display a full TFN on a payslip (show last 3 digits only, or omit entirely)
• Store TFN records securely with restricted access
• Destroy TFN records when no longer required (after 7 years post-employment)
• Never share TFN information with unauthorised parties
• Report any TFN breaches to the ATO

Penalties for TFN Misuse

Misuse of a TFN, including unauthorised disclosure, is a criminal offence carrying penalties of up to 2 years imprisonment and/or fines of $26,640 for individuals.

TFN for Special Employee Categories

Working Holiday Makers

Working holiday visa holders (subclass 417 and 462) have their own tax rates, but still need to provide a TFN. They should mark their employment basis as "Holiday maker" on the TFN declaration form. Without a TFN, they are withheld at 47% like any other employee.

Foreign Residents

Non-residents for tax purposes do not get the tax-free threshold, so their withholding starts from the first dollar earned. However, they still need to provide a TFN to avoid the 47% rate.

Multiple Jobs

An employee with multiple jobs should only claim the tax-free threshold from one employer. They complete a TFN declaration for each employer, but tick "No" for the tax-free threshold on all but their primary employer.

How to Get a TFN

Australian Residents

• Apply online through the ATO website (for Australian residents with a passport)
• Apply at a Tax Office in person with identity documents
• Apply by phone through the ATO
• Processing time: usually 28 days

Foreign Residents and Temporary Visa Holders

• Apply online through the ATO website with a valid visa
• Can apply from outside Australia up to 3 months before arriving

TFN Declarations and PayslipMate

PayslipMate respects TFN declaration outcomes:

• When creating a payslip, you indicate whether the employee has provided a TFN
• If no TFN, PayslipMate automatically applies the 47% withholding rate
• Tax-free threshold status is factored into PAYG calculations
• HECS-HELP declarations trigger additional withholding

Ensure your payslips are correctly calculated from day one. Create a payslip now — your first one is free →