Second Job Tax Calculator Australia
The tax you actually owe on a second job for 2026-27, the effective rate on it, and why payday withholding on job 2 looks worse than it is.
Second Job Tax Calculator 2026-27
How is tax on a second job calculated?
One combined income, one set of brackets. The jobs are only separate on payday.
Your actual tax is worked out once a year, on your combined income from every job, through the same 2026-27 resident brackets everyone uses. Earn $70,000 at job 1 and $20,000 at job 2, and the ATO taxes $90,000, exactly as if one employer had paid it all.
So the true cost of job 2 is the tax on $90,000 minus the tax on $70,000. That difference is $6,400 including the 2% Medicare levy, an effective 32% on the second income. The calculator above runs exactly this subtraction on your own numbers.
The effective rate on job 2 is higher than your average rate because job 1 has already used the $18,200 tax-free threshold (FY2026-27) and the cheap 15% band. Every job 2 dollar stacks on top, so it is taxed at your marginal rate, 30% plus Medicare in this example. That is the honest cost of the extra income, and it applies equally to overtime or a pay rise in your main job.
Why does your second job look over-taxed on payday?
Because job 2 is withheld from the first dollar. That is a timing effect, not a higher tax.
Each employer withholds as if theirs were your only job. The ATO’s multiple-payers rule says to claim the tax-free threshold from one payer, so job 1 withholds nothing until your pay passes the threshold, while job 2 withholds at the no-tax-free-threshold rate from the first dollar. Side by side, job 2’s payslip looks brutal.
Nothing extra is being taxed. Withholding is a payday estimate under the ATO’s withholding schedules (Schedule 1, NAT 1004, applied by payroll software), and the no-threshold rate exists to stop your combined withholding falling short. The estimate over-collects on job 2 precisely because it assumes the threshold is being used elsewhere, which it is.
The distinction to hold on to: withheld is what comes out during the year, owed is what the return works out at the end. On a second job the two diverge more than in almost any other pay situation, and the gap is settled, in your favour when over-withheld, at tax time. The full mechanics are in our PAYG withholding guide.
Which job should claim the tax-free threshold?
One payer only, usually the one paying the most.
Claim the $18,200 tax-free threshold (FY2026-27) from one payer, normally the job paying the highest wage. The ATO’s multiple-jobs guidance is explicit on both the one-payer rule and the highest-payer choice. Your other jobs should withhold at the no-threshold rate.
With the threshold claimed, a payer starts withholding once your pay passes the equivalent of $18,200 across the year. Those trigger points, from the ATO’s multiple-jobs page, are below.
| Pay cycle | Withholding starts above |
|---|---|
| Weekly | $363 per week |
| Fortnightly | $726 per fortnight |
| Monthly | $1,573 per month |
Applies to the payer where the tax-free threshold is claimed. Source: ATO, Multiple jobs or change of job. Figures as published at 19 July 2026.
Two flexibilities are worth knowing. If your total income from all sources will stay at or under $18,200, you can claim the threshold from every payer. And when you change jobs, you claim the threshold from the new employer even if you claimed it from the old one earlier in the same year, because they are not paying you at the same time. Read more in the tax-free threshold guide.
How much extra tax does a second job add?
Actual 2026-27 tax attributable to job 2, including Medicare levy, resident rates, no HECS-HELP.
| Job 1 income | Job 2 income | Tax owed on job 2 | Effective rate on job 2 | You keep from job 2 |
|---|---|---|---|---|
| $45,000 | $10,000 | $3,350 | 33.5% | $6,650 |
| $50,000 | $15,000 | $5,025 | 33.5% | $9,975 |
| $60,000 | $15,000 | $4,900 | 32.7% | $10,100 |
| $70,000 | $20,000 | $6,400 | 32% | $13,600 |
| $80,000 | $20,000 | $6,400 | 32% | $13,600 |
| $90,000 | $30,000 | $9,600 | 32% | $20,400 |
Computed from the 2026-27 resident scale with the Medicare levy and LITO, as the annual tax difference between job 1 alone and both jobs combined. Payday withholding on job 2 will differ; the gap settles at assessment.
Does a second job push you into a higher tax bracket?
Only the dollars above each threshold, never your whole income.
Sometimes, and it costs less than people fear. Australia’s brackets are marginal: crossing a threshold taxes only the dollars above it at the higher rate. If job 2 lifts you from $120,000 to $140,000, only the $5,000 above the $135,000 threshold is taxed at 37% (FY2026-27); everything below keeps its old rate.
Put differently, job 1’s tax bill does not change because you took job 2. The second income lands on top of the first, fills the remainder of the current bracket, and spills into the next one only when it must. That is why the effective rates in the table above sit close to one marginal rate rather than jumping erratically.
The same logic answers the fear that a second job could leave you worse off overall. It cannot. Each extra dollar is taxed at no more than 45% plus the 2% Medicare levy (FY2026-27 top rate), so every extra dollar earned leaves at least something in your pocket. Our marginal vs average tax rate guide unpacks this with worked figures.
Why does it usually resolve at tax time?
Withholding is a credit. The return trues everything up.
At assessment the ATO adds up your income from every payer, calculates the actual tax on the total, and credits every dollar withheld from every job against it. Credit larger than the bill, you are refunded the difference. Smaller, you owe it. The whole second-job problem reduces to which side of that line your withholding landed on.
Claimed the threshold on one job, the no-threshold rate on job 2 usually over-collects, and deductions plus offsets applied at assessment push further in your favour. That is the common case, and it ends in a refund. Claimed the threshold on two jobs at once, both payers treated your first $18,200 as tax-free, the combined withholding under-collected, and the shortfall arrives as a bill.
| Threshold claimed on one job | Threshold claimed on both jobs | |
|---|---|---|
| Job 1 withholding | First $18,200 treated tax-free | First $18,200 treated tax-free |
| Job 2 withholding | No-threshold rate, from the first dollar | Also treats $18,200 as tax-free |
| Combined withholding | Usually more than the tax owed | Less than the tax owed |
| At assessment | Typically a refund | Typically a tax bill |
Source: ATO, Multiple jobs or change of job. The threshold itself is $18,200 for 2026-27, and it applies once per person per year, not once per job.
If the during-year gap bothers you in either direction, the ATO accepts a PAYG withholding variation to raise or lower the rate, rather than waiting for the annual true-up.
What about HECS-HELP with two jobs?
The repayment is on combined income, and neither employer can see the other job.
Your 2026-27 HECS-HELP repayment is calculated on your whole-year income, both jobs combined. The marginal system charges 15c per dollar above $69,528 and 17c per dollar above $129,717. Two jobs of $45,000 and $35,000 put you $10,472 over the threshold, a repayment of $1,571, even though each job alone sits under it.
That blind spot is the trap. Each employer only withholds extra for a study loan based on the pay they see, so two under-threshold jobs can produce no loan withholding at all while the combined income triggers a real repayment. It surfaces as a bill at assessment. Telling both employers you have a study loan on the TFN declaration closes most of the gap.
Toggle HECS-HELP on in the calculator above to see the repayment attributed to job 2, and use the HECS-HELP repayment calculator for the full-year picture.
Who uses this second job tax calculator?
Four situations account for most second-job searches.
The weekend casual
A full-time salary plus casual shifts elsewhere. The casual job withholds at the no-threshold rate, the first payslip stings, and the question is what the shifts really cost in tax. The answer is the marginal rate, not the withholding.
The two part-timer
Two part-time jobs, neither large. The risk runs the other way: threshold claimed at both means under-withholding and a bill. Claim it once, at the higher payer, and check the combined position before June.
The side hustler going on payroll
A second employer, not an ABN. The new payslip shows tax from the first dollar. This page is the reassurance: the effective rate on the extra income is the true cost, and the over-withholding returns at tax time.
The graduate with a HECS-HELP debt
Combined income crosses $69,528 (FY2026-27) while each job sits below it. No employer withholds for the loan, and the repayment lands at assessment. Seeing it now is the difference between a plan and a shock.
What changed on 1 July 2026?
Four moves matter for two-job workers this year.
The first marginal rate fell from 16% to 15% on the $18,201 to $45,000 band, which trims the tax on combined income for nearly everyone. The ATO reissued all 15 withholding schedules and 12 tax tables from 1 July 2026 to match, so both jobs’ payday withholding already reflects the cut.
The HECS-HELP repayment threshold was indexed up to $69,528, under the marginal system: 15c per dollar above the threshold, 17c above $129,717. For two-job workers the threshold is tested on combined income, so the indexation moves the point where the repayment trap starts.
A $1,000 standard work deduction is now law for 2026-27, claimable instead of itemised work expenses when you lodge from July 2027. It is applied at return time, not payday, so for a two-job worker it typically enlarges the refund that the no-threshold withholding was already building. The tax-free threshold itself is unchanged at $18,200.
What are the common second job tax mistakes?
Five errors cover most of the damage.
Claiming the threshold twice
Both employers treat your first $18,200 as tax-free, combined withholding runs short all year, and the shortfall arrives as a single bill at assessment. Claim it once, usually at the higher payer.
Reading withholding as a tax rate
The no-threshold rate on job 2 is an estimate designed to over-collect slightly. The tax you owe on job 2 is the marginal rate on your combined income, which this page computes.
Turning down work to stay in a bracket
Brackets are marginal. Only the dollars above each threshold pay the higher rate, so extra income always leaves you ahead after tax, at every 2026-27 income level.
Forgetting the study loan
HECS-HELP is assessed on combined income above $69,528 (FY2026-27). Two under-threshold jobs can mean no loan withholding all year and a repayment bill at tax time.
Not moving the threshold when jobs change
Dropped the job that claimed the threshold? Lodge a withholding declaration with the remaining employer. Otherwise every dollar keeps being withheld at the no-threshold rate until you do.
Second Job Tax FAQ
Common questions about tax across two jobs.
Sources
The documents behind every figure on this page.
- ATO, Multiple jobs or change of job: the one-payer tax-free threshold rule, the no-threshold rate, and the $363 weekly, $726 fortnightly and $1,573 monthly trigger points. Figures as published at 19 July 2026.
- ATO, Tax tables overview and Schedule 1, Statement of formulas for calculating amounts to be withheld (NAT 1004): 15 withholding schedules and 12 tax tables updated from 1 July 2026.
- ATO, individual income tax rates for 2026-27, including the 15% first marginal rate under the Treasury Laws Amendment (More Cost of Living Relief) Act 2025.
- ATO, study and training support loan repayment thresholds for 2026-27 ($69,528 and $129,717).
- ATO, Standard deduction for work-related expenses: the $1,000 standard deduction, law for the 2026-27 income year, claimed at return time.
Last verified 23 July 2026.
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