The short answer
If you have a second job in Australia, you can only claim the tax-free threshold ($18,200 for FY2025–26) from one payer at a time — normally whichever employer pays you the most. On the TFN declaration for every other job, you answer "No" to the tax-free threshold question. Many people still end up with a tax bill at year-end even when they filled this in correctly, because each employer withholds tax based only on what *they* pay you, not on your combined income from every job. Medicare Levy is not charged twice either — it's worked out once on your total taxable income when you lodge, and every payer's income goes into the same tax return, not separate ones.
Why the tax-free threshold only applies once
The tax-free threshold means the first $18,200 you earn each financial year is taxed at 0%. Under the Revised Stage 3 rates that apply for FY2025–26, income above that is taxed progressively:
| Taxable income | Tax rate |
|---|---|
| $0 – $18,200 | 0% |
| $18,201 – $45,000 | 16% of the excess over $18,200 |
| $45,001 – $135,000 | $4,288 plus 30% of the excess over $45,000 |
| $135,001 – $190,000 | $31,288 plus 37% of the excess over $135,000 |
| $190,001+ | $51,638 plus 45% of the excess over $190,000 |
The threshold is a once-per-year entitlement, not a once-per-job entitlement. When you start a job, your employer gives you a TFN declaration (or the equivalent digital onboarding through Single Touch Payroll) and asks: *"Do you want to claim the tax-free threshold from this payer?"* Answer "Yes" at more than one employer at the same time, and each of them withholds tax as if the first $18,200 they pay you is exempt — effectively applying the exemption twice (or three times, for three jobs) when the Australian Taxation Office (ATO) only allows it once across your combined income for the year.
Which job should claim it?
Standing ATO (ATO guidelines) guidance is to claim the threshold from whichever payer usually pays you the most, and answer "No" at every other concurrent job. This doesn't change how much tax you ultimately owe — your total liability is always based on combined income — but it gets the amount withheld throughout the year closer to correct, so you're less likely to be hit with one large bill at tax time.
Why you can still owe tax with two jobs
Even when the TFN declaration is filled in correctly, a second job commonly produces a shortfall. Here's the mechanism:
- Each employer calculates PAYG withholding using only what they pay you, as if it were your sole income.
- Your main job might withhold correctly for, say, a $50,000 salary. Your second job — with "No" selected for the threshold — withholds at a flat higher rate designed for someone with no tax-free threshold, but still calculated only on what that employer pays you, say $20,000.
- At tax time, the ATO combines both incomes ($70,000) and applies the marginal rates above to the full amount. If the combined figure crosses into a higher bracket than either employer individually accounted for, the tax actually owed is higher than the sum of what both employers withheld.
The same blind spot affects HELP/HECS repayments if you have a study loan. The compulsory repayment threshold for FY2025–26 is $67,000 of repayment income. Neither job might reach that on its own, so neither employer withholds anything extra for it — but your combined income might clear $67,000, triggering a repayment that only shows up when you lodge.
Worked example: Mia works full-time at a retail store on $58,000 a year (tax-free threshold claimed there) and picks up weekend shifts at a café paying $15,000 a year (threshold answered "No"). The store's withholding assumes a $58,000 salary; the café's assumes a $15,000 salary taxed from the first dollar. At tax time, the ATO adds both wages together into taxable income of $73,000, which sits in the $45,001–$135,000 bracket ($4,288 plus 30% of the excess over $45,000). Because neither employer individually withheld enough for a combined income that size, Mia is more likely to see a bill than a refund when she lodges — even though both TFN declarations were filled in exactly as instructed.
AusTax AI tip: If you expect a shortfall, you can ask an employer to withhold an additional amount each pay cycle — there's a specific question for this on the TFN/withholding declaration. It won't change what you owe overall, but it can stop a large bill landing all at once.
Does Medicare Levy get charged twice?
No. The Medicare Levy is not withheld or assessed separately by each employer — it's calculated once, by the ATO, on your combined taxable income when you lodge. For FY2025–26:
- Taxable income up to $28,011 (single, no dependants): levy-exempt
- $28,011–$35,013: the levy shades in at 10 cents for every dollar above the threshold
- Above $35,013: the full 2% applies
Each employer's withholding table includes its own estimate for the levy, based only on what that employer pays you — but your actual Medicare Levy liability is only ever worked out once, on your combined income, when you lodge, and reconciled against how much was withheld across all your jobs.
A second job can also push your combined income over the Medicare Levy Surcharge (MLS) threshold — $101,000 for singles in FY2025–26 — even if neither job alone would trigger it. Without an appropriate level of private hospital cover, the MLS adds an extra 1%–1.5% depending on your income tier, so it's worth checking whether your combined pay now sits above that threshold.
Combining all your employers into one tax return
You don't lodge a separate tax return per job — every payer's income for the financial year goes into the same return. If you're self-lodging through myTax:
- Each employer reports your pay through Single Touch Payroll (STP), so income statements normally pre-fill automatically in myGov under "Employment"
- Wait until every income statement shows "Tax ready" before lodging — a newly started job can take a few extra days to appear
- Check that every payer for the year is listed, including short-term or casual employers you might have forgotten about
If a TPB registered Tax Agent lodges on your behalf, they pull together all of your income statements as part of preparing the return — useful if you've had several employers or gig platforms in the same year and aren't sure everything has synced through STP yet.
Common second-job scenarios
| Situation | Tax-free threshold | Typical outcome |
|---|---|---|
| Two (or more) PAYG jobs running at the same time | Claim "Yes" at the highest-paying job only; "No" at the rest | Some shortfall risk if combined income crosses into a higher bracket |
| Left Job A, then started Job B (not overlapping) | Can claim "Yes" at Job B once Job A has ended | Usually little to no shortfall — income wasn't earned simultaneously |
| Second income is gig work or freelancing under an ABN | No TFN declaration or PAYG withholding applies | Tax on that income is only settled at lodgement unless you set money aside yourself |
| Casual second job with irregular hours | Still answer "No" to the threshold while the main job is ongoing | Shortfall risk scales with how much the combined income pushes you up a bracket |
Records to keep
- Income statements (or payment summaries) from every employer for the financial year
- A copy of each TFN/withholding declaration showing which payer you claimed the threshold from
- Confirmation of any additional voluntary withholding you asked an employer to apply
- Your private health insurance statement, if you want to check your Medicare Levy Surcharge position
- Invoices or income records for any ABN/contract work, kept separate from PAYG wages
- Records of same-day travel directly between two workplaces if you're claiming vehicle costs — travel from home to either job is not deductible, but travel directly between them on the same day may be deductible if it's genuinely work-related
Quick checklist
- Confirm you've only answered "Yes" to the tax-free threshold at one payer
- Work out whether your combined income crosses into a higher tax bracket, the $67,000 HELP repayment threshold, or the $101,000 MLS threshold
- Ask an employer to withhold an additional amount if you expect a shortfall
- Wait for every income statement to show "Tax ready" in myGov before lodging
- Declare all payers in the one tax return, not separate returns
- Keep evidence of same-day travel between jobs if claiming vehicle deductions
Working out whether two or three employers between them have withheld enough — and whether your combined pay has quietly crossed into a higher bracket, the HELP repayment threshold, or the Medicare Levy Surcharge — is one of the fiddlier parts of a multi-employer tax return. AusTax AI brings all of your income statements together in one place and flags where the numbers look like they don't add up, before you submit anything to the ATO.
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*Disclaimer: This is general information only and does not constitute personal tax advice. Consult a registered tax agent for advice tailored to your specific situation. Always verify against the latest ATO guidelines at ato.gov.au.*
*Disclaimer: general information only — not personal tax advice.*