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Do You Get Taxed More Working a Second Job?

by | Sep 10, 2025 | Tax Solutions

Many Australians take on a second job to boost their income, cover extra expenses, or save for a goal. A common question is whether you get taxed more when you have two jobs. The short answer is no, you don’t pay a higher tax rate just because it’s a second job, but your overall income can push you into a higher tax bracket.

How Income Tax Works in Australia

The Australian Tax Office (ATO) uses a progressive tax system. This means:

  • The first portion of your income is taxed at the lowest rate.
  • As your income increases, the extra income you earn can be taxed at higher rates.
  • Your income from all jobs is added together to work out your total tax for the year.

Why a Second Job Can Affect How Much Tax You Pay?

When you start a new job, you fill out a Tax file number (TFN) declaration form. This tells your employer whether you’re claiming the tax-free threshold (the first $18,200 of your income that’s tax-free). You can only claim this threshold from one employer at a time.

If you claim it from both jobs, you might not have enough tax withheld during the year, leading to a bill at tax time.

If you don’t claim the tax-free threshold from your second job, your employer will withhold tax at a higher rate from every dollar you earn there. This isn’t a penalty, it’s to make sure enough tax is collected to cover the tax on your total income.

Example

  • Job 1 income: $50,000
  • Job 2 income: $20,000
  • Total income for the year: $70,000

The ATO calculates tax on the $70,000 total, not each job separately. Your employers withhold tax based on your TFN declaration settings, which affects whether you get a refund or a bill at the end of the year.

Other Things to Keep in Mind

  • Medicare Levy: This is generally 2% of your taxable income and applies to your combined earnings.
  • HECS-HELP or other study debts: Each employer will only withhold repayments based on the income they pay you. However, when your total income from all jobs is combined, you may be required to pay a higher percentage of your HECS/HELP debt that what has been withheld.
  • Extra withholdings: If you want to avoid a tax bill, you can ask your second employer to withhold additional tax.

Final Words

Working a second job doesn’t mean you’re taxed at a special higher rate. It simply increases your total taxable income, which may put part of your earnings into a higher tax bracket.

This information is general and based on current ATO rules. It doesn’t take into account your personal circumstances, so it’s best to speak with a registered tax agent about your specific situation.