Multi-State Payroll Tax Apportionment

A practice that pays wages in more than one state does not get a full tax-free threshold in each. The threshold is apportioned by that state's share of the group's Australia-wide wages, so the deduction available in a state shrinks as the group's national wage bill grows. Two practices with identical wages in one state can therefore owe different amounts, because the answer depends on where else the group employs people.

The problem

Australian payroll tax is administered state-by-state, but thresholds are assessed against Australia-wide group wages. When an employer pays wages in more than one jurisdiction, each state's tax-free threshold is apportioned proportionally, preventing employers from claiming the full threshold in multiple states simultaneously.

The formula

The formula applied to every state is:

Deduction = BaseThreshold × (State Wages ÷ Total Australian Wages)

Taxable wages are then the excess of state wages over this apportioned deduction, multiplied by the state's applicable rate.

Worked example

A group with $5,000,000 in Australia-wide wages, of which $2,000,000 are paid to NSW employees and $3,000,000 to Victorian employees:

• NSW share = $2,000,000 ÷ $5,000,000 = 40%
• NSW apportioned threshold = $1,200,000 × 40% = $480,000
• NSW taxable wages = $2,000,000 − $480,000 = $1,520,000
• NSW payroll tax = $1,520,000 × 5.45% = $82,840

A larger example: a $12,000,000 group across three states

Apportionment bites hardest when the group is large enough to trigger the state-specific phase-outs. Take a national group with $12,000,000 in Australia-wide wages: $6,000,000 paid in New South Wales, $4,000,000 in Victoria and $2,000,000 in Queensland, with a single Designated Group Employer. The table below is computed by the calculation engine for 2026/2027; the figures are the same ones the calculator produces for this input.

Three things happen at this size that do not happen at $5,000,000. Victoria's $1,000,000 threshold is fully phased out (it reaches zero at $5,000,000 of national wages), so Victorian wages are taxed from the first dollar. Queensland's diminishing deduction has also collapsed to zero and its tier-2 rate of 4.95% has engaged. And both states' mental health charges now apply, because they are tested on Australia-wide wages above $10M and then apportioned to the state's share: Victoria's combined mental health and COVID-19 debt surcharges and Queensland's mental health levy. The effective group rate on $12,000,000 is 4.96%.

The practical point is that once the thresholds have collapsed, the choice of which entity holds the wage base stops saving anything: there is no remaining threshold to allocate between group members. The exposure is set by where the wages sit, not by which entity is nominated as the Designated Group Employer.

Critical nuances

Victoria phases out the $1,000,000 threshold between $3,000,000 and $5,000,000 of Australian wages, reducing the deduction by $0.50 for each dollar of excess over $3,000,000. Queensland's deduction diminishes $1 for every $7 above $1,300,000, reaching $0 at $6,500,000, the point at which its tier-2 rate of 4.95% engages. Western Australia uses a wider $1,000,000 to $7,500,000 taper window. Each state's threshold, taper and rate logic applies independently after the apportionment ratio is calculated.

The DGE rule

Only the Designated Group Employer (DGE), a single nominated entity within a grouped structure, may claim the threshold. All other group members pay payroll tax from the first dollar of wages. Failure to nominate the optimal DGE is a common and costly error. See our grouping and DGE guide.

Which state a wage belongs to

Apportionment divides the wage bill, so it assumes each wage has already been placed in a state. That placement is the first step, and it is not always obvious. A wage is generally attributed to the jurisdiction in which the employee's services are performed, which for a practice with rooms in two states can differ from the state where the employment contract was signed or the payroll is processed. A practitioner who works across two sites, or a manager who covers both, needs the split decided on the facts rather than left to whichever account the salary leaves from.

This matters more than it looks, because the share drives everything downstream. Move $500,000 of wages from a state with a large threshold to one with a small threshold and both the apportioned deduction and the taxable wages change, even though the group's national wage bill has not moved at all.

Medical relief is applied state by state

A practice that engages general practitioners in more than one state does not get one relief calculation. Each provision is enacted by its own state and applies only to wages paid in that state, so a group can be exempt in one jurisdiction, partly exempt in another and fully taxable in a third, on the same practitioner type.

Queensland exempts GP wages outright with no bulk-billing condition. Victoria, South Australia and the ACT exempt the bulk-billed proportion, so the relief there moves with the practice's bulk billing rate. New South Wales gives a rebate after tax rather than an exemption, which does not reduce the wage base the apportioned threshold is measured against. Tasmania and the Northern Territory have no relief, and Western Australia does not apply the relevant contract provisions to medical practices at all.

None of it covers dentists, physiotherapists, psychologists, non-GP specialists or other allied health practitioners in any jurisdiction. The GP relief across Australia page sets out the position jurisdiction by jurisdiction.

Monthly apportionment is not one twelfth of the annual figure

Most jurisdictions require a monthly return, and the apportionment ratio is recalculated for each return period from the wages paid in that period. A group whose wage mix is seasonal therefore sees its apportioned deduction rise and fall through the year rather than settle at one twelfth of the annual position.

The calculator treats a monthly figure as the annualised position divided by twelve, and labels it as an approximation for that reason. New South Wales day-weights its monthly threshold in practice, so a month with a different number of working days does not carry the same deduction as its neighbours. Use a monthly figure for planning and sense-checking, and calculate the return from the period's own wages.

Verify your figures

Use our multi-state calculator to model your group structure. Core rates and thresholds are checked against the administering revenue office, and any figure that could not be confirmed is flagged on the page; see our editorial policy. The full rate structure for every jurisdiction is on the payroll tax rates page.