Australian pay looks simple on the payslip and complicated everywhere else, because four different systems touch the same salary: income tax with its brackets and offsets, the Medicare levy with its shade-in, HELP repayments for student debt, and superannuation, which is paid on top of salary rather than out of it. Each system has its own rules, its own thresholds, and its own timing, and the take-home figure is whatever survives all four. This guide follows a dollar from gross salary to bank account, explains each deduction in the order it actually applies, and shows how to check a payslip against the calculator rather than trusting either one blindly.

From gross salary to take-home pay, in order

The order matters because each deduction is calculated on a different base. Income tax is calculated on taxable income, which is gross salary minus deductions such as salary sacrifice. The Medicare levy is calculated on taxable income as well, with its own thresholds. HELP repayments are calculated on a broader repayment income that includes items beyond taxable income. Super guarantee sits outside the whole chain: the employer pays it on top of salary into the fund, and it never appears as a deduction on the payslip.

The payslip check is to work backwards from the net figure. Add back each deduction to reach gross, and check each deduction against its own rule rather than against the net. A payslip that looks wrong usually has one deduction wrong, and the backwards walk finds which one, because each deduction leaves a different fingerprint on the numbers.

Income tax: brackets, offsets, and the marginal rule

Australian resident income tax uses marginal brackets: each slice of income is taxed at its own rate, and crossing a boundary taxes only the slice above it at the higher rate. The calculator on this page uses the 2026-27 rates, and the guide sections on the calculator page work three salaries through those rates step by step. The marginal rule is the single most important fact in Australian pay, because it kills the myth that a raise can leave you worse off: a raise can raise your marginal rate, but it cannot reduce your after-tax income, since only the new slice is taxed higher.

Offsets then reduce the tax payable, not the taxable income, which is a different operation with a different effect. An offset of $1,000 reduces tax by $1,000, while a deduction of $1,000 reduces taxable income by $1,000 and therefore saves tax only at the marginal rate. Confusing the two overstates the value of deductions and understates the value of offsets, and the payslip check should keep them in separate columns.

The Medicare levy and its shade-in

The Medicare levy is 2 percent of taxable income for most taxpayers, but it does not switch on at 2 percent from the first dollar above a threshold. Below a low-income threshold no levy is payable, and between the threshold and the point where 2 percent of income equals 10 percent of the excess, the levy shades in at 10 percent of the amount above the threshold. The shade-in exists precisely to avoid a cliff: without it, earning one extra dollar above the threshold would cost far more than a dollar in levy.

The practical consequence is that low-income earners near the threshold face a higher effective marginal rate in the shade-in zone, because each extra dollar attracts both income tax and 10 percent levy. The zone is narrow, but it is the reason a small raise near the threshold can feel surprisingly small in take-home terms, and the calculator models it rather than applying a flat 2 percent.

HELP repayments: the marginal system that replaced the cliff

HELP repayments, formerly HECS, used to work as a cliff: crossing a repayment threshold by one dollar triggered repayment on the whole income at the applicable rate. The system now works marginally, like tax brackets: each slice of repayment income above a threshold is repaid at its own rate, and crossing a boundary only changes the rate on the slice above it. The change removed the old trap in which a small raise could cost more in repayments than it paid.

Repayment income is broader than taxable income: it adds back items such as reportable super contributions and net investment losses. A salary figure alone therefore does not determine a HELP repayment; the repayment income figure does, and the calculator asks for the inputs that build it. Anyone with a HELP debt who changes jobs, starts salary sacrificing, or takes investment losses should recheck the repayment, because the repayment income moves even when the salary does not.

Superannuation: the money that never touches your pay

The super guarantee is an employer contribution calculated as a percentage of ordinary time earnings and paid into the employee’s fund on top of salary. It is not a deduction, it does not reduce take-home pay, and it does not appear as a subtraction on the payslip. An employee who compares gross salary with take-home pay and cannot account for the difference is usually looking for the guarantee in the wrong place: it was never in the paycheck.

Salary sacrifice is the mirror image: the employee directs part of salary into super before tax, which reduces taxable income and take-home pay together. The two are often confused because both end up in the same fund, but they enter it from opposite sides of the payslip. Voluntary contributions after tax are a third route, with their own tax treatment, and the three should never be added together as if they were one figure.

Checking a payslip against the calculator

Start with the annual figures, not a single paycheck, because withholding is calculated annually and divided into cycles. Enter the annual salary, the sacrifice, and the HELP status into the calculator, and compare the annual tax, levy, and repayment with the year-to-date figures on the payslip, scaled to the full year. A single paycheck can be distorted by a bonus, a back-pay adjustment, or a mid-year code change; the year-to-date figure is the honest comparison.

If the annual figures disagree, change one input at a time. Salary first, then sacrifice, then HELP status, then pay frequency. The input whose change reconciles the figures is usually the one the payroll system has recorded differently from what you assumed, and the most common candidates are a sacrifice that started mid-year and a HELP debt the payroll system does not know about.

Frequently asked questions

Is superannuation deducted from my pay in Australia?

No. The super guarantee is paid by your employer on top of your salary into your fund. Salary sacrifice is different: it comes out of your salary before tax and does reduce take-home pay.

Can a pay rise leave me worse off after tax?

No. Tax is marginal, so only the slice above a bracket boundary is taxed at the higher rate. A raise can raise your marginal rate but cannot reduce your after-tax income.

What is the Medicare levy shade-in?

Between the low-income threshold and the point where 2% of income applies, the levy is charged at 10% of the amount above the threshold, shading in gradually instead of switching on at 2% all at once.

How are HELP repayments calculated now?

Marginally, like tax brackets: each slice of repayment income above a threshold is repaid at its own rate. The old cliff system, where crossing a threshold triggered repayment on the whole income, no longer applies.

Why does changing pay frequency not change my annual tax?

Because tax is calculated on the annual figure and withholding is divided into pay cycles. Frequency changes the size and timing of each paycheck, not the annual result.

What should I check first if my payslip looks wrong?

Compare annual and year-to-date figures, not a single paycheck, then change one input at a time: salary, sacrifice, HELP status, pay frequency. The input that reconciles the figures is usually the one recorded differently.