The second-job tax myth, busted.
A second job is not taxed at a special higher rate. More tax is simply withheld during the year because the tax-free threshold only applies once. Here's how to work out what you'll really pay on your combined income for 2026–27.
How tax on a second job actually works
At tax time the ATO doesn't care how many jobs you have. It adds every payslip together and taxes the combined total under the normal 2026–27 brackets. Three things matter along the way:
1. The tax-free threshold applies once
You can only claim the $18,200 tax-free threshold with one employer — normally the one who pays you most. Your second employer withholds tax from the first dollar at the "no tax-free threshold" rate. That's why the second payslip looks harshly taxed: it's withholding, not your final tax. If too much is taken out over the year, it comes back as a refund when you lodge.
2. Your real cost is the marginal rate
Because the second job's income stacks on top of the first, it is taxed at your marginal rate — the rate for your top bracket — rather than enjoying its own tax-free threshold. That's the true "cost" of the second job, and it's exactly what you'd pay on a pay rise of the same size.
3. HECS/HELP looks at the combined figure
Compulsory HECS/HELP repayments are based on your total repayment income. Two jobs of $40,000 each mean an $80,000 repayment income — above the $69,528 threshold — even though neither employer alone would withhold a cent for HECS. This is a common cause of surprise tax bills.
Worked example: $60,000 main job + $20,000 second job
| Scenario | Income tax + Medicare | Take-home pay |
|---|---|---|
| Main job only — $60,000 | $9,620 | $50,380 |
| Combined — $80,000 ($60,000 + $20,000) | $16,120 | $63,880 |
| Extra tax caused by the second job | $6,500 | + $13,500 in your pocket |
To run your own numbers, enter your combined income from all jobs in the take-home pay calculator. The difference between the combined result and your main-job-only result is what the second job really costs in tax.
Second job checklist
- TFN declaration: claim the tax-free threshold with your highest-paying employer only.
- Super: both employers must pay the 12% Super Guarantee — nominate the same fund to avoid duplicate fees.
- HECS/HELP: tick the HELP debt box on both TFN declarations so each employer withholds towards the combined repayment.
- Medicare Levy Surcharge: combined income can push you over the surcharge threshold if you don't hold private hospital cover.
- Deductions: you can claim work-related deductions against either job's income in the same single tax return.
Frequently asked questions
Is a second job taxed at a higher rate in Australia?
No. There is no special second-job tax rate. At tax time the ATO adds all your income together and taxes the total under the normal brackets. More is usually withheld from a second job during the year because you can only claim the tax-free threshold with one employer, but any over-withholding comes back as a refund.
Should I claim the tax-free threshold on my second job?
Generally claim it with the employer who pays you the most, and don't claim it on the second job. If you claim it with both employers, too little tax is withheld and you are likely to get a tax bill when you lodge your return.
How much tax will I actually pay on a second job?
The real cost is your marginal rate on the extra income. For example, earning $60,000 in your main job and $20,000 in a second job in 2026–27 means the second job's $20,000 is taxed at about 32% including the Medicare levy — roughly $6,500 — because it sits in the 30% bracket on top of your first salary.
Does a second job affect my HECS/HELP repayment?
It can. Your compulsory HECS/HELP repayment is based on your combined repayment income for the year. A second job can push you over the $69,528 threshold for 2026–27, or into the higher 17c band above $129,717, even if each single job is below it. Check the HECS/HELP calculator with your combined figure.
Do I pay super on a second job?
Yes. Each employer must pay the 12% Super Guarantee on your ordinary time earnings, no matter how small the job is. Consider pointing both employers at the same super fund so you don't collect duplicate account fees.
Will I get a tax bill because of my second job?
Only if too little was withheld during the year — most commonly when the tax-free threshold was claimed on both jobs, or when combined income pushes you into a higher bracket than either employer assumed. Checking the combined figure in a calculator during the year avoids the surprise.