Payroll tax catches out more employers than almost any other state-based obligation, not because the rules are hidden, but because they're easy to underestimate until a business crosses the threshold without realising it. A growing headcount, a new bonus structure, or a handful of contractors added to the mix can quietly push total wages over the line, and the tax applies retrospectively from the month it happens.
Unlike GST or PAYG withholding, payroll tax isn't administered by the ATO. It's a state and territory tax, which means the rules, rates and thresholds differ depending on where your business operates, and that's exactly where a lot of the confusion starts.
Thresholds and state-based rules
Every state and territory sets its own payroll tax threshold and rate, and both can change from year to year. In Victoria, for example, employers become liable once their total Australian wages exceed the annual threshold, currently $1,000,000 (or $83,333 per month), as confirmed by the State Revenue Office for the 2026–27 year. The threshold phases out progressively for businesses with wages between $3 million and $5 million, and disappears entirely above $5 million. Once you're over the threshold, tax applies to the portion of wages above it, at a rate that also varies by state.
Two things to keep in mind here. First, the threshold is based on Australia-wide wages, not just wages paid in the state where the business is registered, which surprises employers operating across multiple states. Second, thresholds are reviewed periodically, so a figure that was accurate last financial year may no longer be current. It's worth checking the relevant state revenue office each year rather than working from memory.
What actually counts as wages
Payroll tax casts a wider net than most employers expect. It's not just base salaries, it includes bonuses, commissions, allowances, most fringe benefits, and superannuation contributions. Termination payments and certain share-based payments can also be captured, depending on the circumstances.
Contractor payments are where things can get complicated. Many contractor arrangements are still treated as taxable wages for payroll tax purposes, even where the same relationship might be treated quite differently for income tax or superannuation purposes. This is a common blind spot: a business might correctly classify someone as a genuine contractor for tax purposes, only to find those same payments are still caught under payroll tax's broader definition of "relevant contracts." Getting this distinction right generally requires a proper review of the contract terms, not just how the relationship is described on paper.
Where errors and misclassifications creep in
Most payroll tax problems don't come from deliberate avoidance, they come from assumptions that were never checked. Wages paid interstate but overlooked in the total. Contractors were treated as exempt without the arrangement actually being tested against the exemption rules. Fringe benefits left out of the calculation because they don't look like "wages" in the traditional sense. Once one of these gaps exists, it tends to compound quarter after quarter until a review or audit brings it to the surface, often with several years of unpaid tax and interest attached.
Grouping provisions: the part employers forget
If your business operates as part of a group of related entities, whether through common ownership, shared employees, or related directors, payroll tax grouping provisions may require those entities to be treated as one for threshold purposes. This matters enormously, because a group of smaller businesses that individually sit under the threshold can still be liable if their combined wages push the group over it.
Grouping catches out businesses that have grown through separate entities for entirely legitimate reasons, asset protection, franchising, or simply how the business evolved over time, without payroll tax ever being part of the original structuring conversation. It's worth reviewing your entity structure specifically against grouping rules, rather than assuming separate ABNs mean separate thresholds.
Monthly lodgment, annual reconciliation
Payroll tax is generally lodged and paid monthly, based on an estimate of the year's wages, with a full reconciliation completed at the end of the financial year once actual figures are known. This two-step process is where discrepancies often surface. If monthly estimates have drifted from actual wages, whether because of unbudgeted bonuses, new hires, or contractor payments that weren't factored in, the annual reconciliation can produce an unexpected top-up liability.
Businesses that keep a running, accurate tally of taxable wages throughout the year, rather than estimating once and forgetting about it, tend to find reconciliation far less stressful, and far less costly.
Getting ready for review and audit
State revenue offices do actively review payroll tax compliance, and grouping and contractor classification are consistently among their most scrutinised areas. Being audit-ready isn't complicated in principle:
- Accurate wage records
- Clear documentation of contractor arrangements and why they're classified as they are
- A record of how grouping has (or hasn't) been assessed.
What tends to make an audit stressful isn't the review itself, it's discovering that assumptions made years ago were never properly documented or revisited. This is genuinely an area where it's worth having your accountant involved before a review happens rather than after. Payroll tax sits slightly outside the areas most business owners watch closely, alongside BAS and income tax, which is exactly why it's worth a periodic health check on its own. It's also one of the areas we cover in our piece on what the ATO and state revenue offices are watching in growing businesses, if you'd like a broader view of where audit risk tends to concentrate.
FAQs
Is payroll tax the same across every state?
No. Each state and territory sets its own threshold and rate, and reviews them periodically, so a business operating in more than one state needs to check the current rules for each.
Do superannuation contributions count towards payroll tax?
Generally, yes. Superannuation is typically included in the definition of taxable wages, alongside salaries, bonuses, commissions and most allowances.
Are contractors always exempt from payroll tax?
Not automatically. Many contractor arrangements are still captured under payroll tax's "relevant contract" provisions, even where the same relationship is treated differently for income tax purposes. Each arrangement needs to be assessed on its own terms.
What are grouping provisions, in simple terms?
Where businesses are related through common ownership, shared employees or related directors, their combined wages can be treated as one total for payroll tax purposes, even if each business individually sits under the threshold.
How often does payroll tax need to be lodged?
Most businesses lodge and pay monthly based on estimated wages, with a full reconciliation against actual figures completed at the end of the financial year.
Bringing it together
Payroll tax rarely causes problems because a business is trying to avoid it. It causes problems because the rules, particularly around contractors and grouping, are genuinely easy to get wrong without meaning to. A yearly review of your wages, contractor arrangements and entity structure against your state's current thresholds is a small investment against a liability that can otherwise build up quietly for years. For more on how this fits alongside your other state and federal obligations, our taxation services page covers where payroll tax sits within the broader compliance picture.
Talk to Rubiix
Not sure whether your business is meeting its payroll tax obligations, or whether grouping provisions apply to your structure? Get in touch with the Rubiix team or follow us on LinkedIn for more insights like this.