If you’re an Australian resident for tax purposes, you don’t have to pay income tax on the first $18,200 you earn each year, from any source. This is called the “tax-free threshold”. If you have more than one job, change employers during the year, have a sole trader side gig or get government payments, it’s important to think about the tax-free threshold and which employer, job or payment you’ll claim it for.
The ATO advises claiming the tax-free threshold once from your “main” payer – typically the job, gig or payment that pays you the most during the year. That payer will not withhold income tax from the first $18,200 they pay you but will withhold tax from payments once your earnings go over the threshold.
At the end of the financial year, the ATO calculates your total income and tax withheld. If not enough tax has been withheld, you can expect a tax bill. If more tax has been withheld than you owe for your total earnings, you can expect a refund.
When starting a new job, your employer should ask you to complete a withholding declaration.