Register for a tax file number

A tax file number (TFN) is your unique number in the tax system. Learn how to apply for a TFN for your business so you can manage your tax and other government services.

Why you need a tax file number (TFN)

A tax file number (TFN) is a unique number issued by the Australian Taxation Office (ATO) to individuals and organisations.

Registering for a TFN is an important step when starting your business. You can then give it to:

• investment bodies responsible for paying interest, dividends and unit trust distributions
• government bodies, for example the ATO, when applying for an Australian Business Number (ABN) or lodging income tax returns
• employers (this applies to individuals only)

Check which type of TFN your business needs

This depends on your business structure.

If you operate a partnership, company or trust

You’ll need a separate TFN for your business. Most businesses can apply for a TFN when they apply for an ABN.

If you're a sole trader

Use your individual TFN when you deal with the ATO. If you don’t have one, you can apply for an individual TFN on the ATO website.

Register for a TFN

Apply for a TFN for business on the Australian Business Register website. Before you apply:

• check which type of TFN you need
• have details of your business activities and associates ready