The Consultant's Tax Trap: PSI and the ATO's Traffic Light System

PSI Tax Rules for Consultants in Australia

If you're a high-earning IT contractor, management consultant, engineer, or professional firm partner, there's a persistent myth doing the rounds: set up a company or family trust, funnel your income through it, and your tax rate magically caps out at 25% or 30%. Some go further and assume they can split that income with a lower-earning spouse to dodge the top marginal bracket entirely.

At Aevum Accounting, this is one of the most dangerous misconceptions we see. When consultants get this wrong, the result isn't a small correction. It's years of back taxes, interest, and penalties that can undo a decade of careful planning.

Layer One: The PSI Net

Personal Services Income, or PSI, is the ATO's first line of defence. Income is classified as PSI if more than 50% of what you're paid for a contract is a reward for your personal effort or skills, rather than from the use of assets, the sale of goods, or a broader business structure.

Bob is an IT consultant who charges $150 an hour to write code for a bank. He uses his own laptop, but the income comes entirely from his expertise. That's PSI. Compare that to Sarah, who runs a custom furniture business using $100,000 worth of machinery and raw timber. Even though she builds the furniture herself, her income is generated by the machinery and materials just as much as her skill. That's not PSI.

What PSI means for you:

• If your income is caught as PSI, the ATO looks straight through your company or trust

• Every dollar of profit is attributed back to your personal tax return and taxed at your individual marginal rate

• Income splitting is not allowed

• Certain business deductions are blocked entirely

Escaping the Net: The Personal Services Business Tests

To avoid being caught by PSI rules, you need to prove you're operating a genuine Personal Services Business (PSB). The gold standard is the results test. To pass it, you need to be paid to produce a specific result, supply your own tools, and be financially liable for fixing any defects in your work.

This is where a lot of contractors fall down. Being paid a daily rate almost always fails the results test, because you're being paid for your time, not for delivering a fixed outcome.

Take Mike, a cybersecurity consultant who lands a $1,200-a-day contract with a bank and sets up his own proprietary limited company. Because he's paid for his time rather than a fixed result, he fails the results test straight away.

The 80% Rule and Why It Catches So Many Consultants Out

If the results test doesn't apply, there's another hurdle: the 80% rule. If 80% or more of your PSI comes from a single client, you can't self-assess as a PSB under the other tests, such as the unrelated clients test, unless you've got a specific determination from the ATO.

This is a common trap for consultants on long-term government contracts. If Mike relies on one client for 90% of his income in a year, he fails the 80% rule too. The result is the same either way: he's caught by PSI, and every dollar is taxed in his personal name.

Passing PSB Tests Doesn't Mean You're In the Clear

Here's where the biggest confusion lies. Let's say you do pass the PSB tests. You run an engineering consultancy, you've got dozens of unrelated clients, and you operate from a dedicated commercial office. You're officially a PSB. Surely now you can split your income freely?

Not quite. Passing the PSB tests doesn't switch off the ATO's general anti-avoidance rules. That brings us to the third layer: the traffic light system, formally known as PCG 2021/4.

The Traffic Light System: PCG 2021/4

This is the ATO's crackdown on professional practitioners who use structures to artificially reduce their personal tax. The principle is simple: if you're the key driver generating the revenue through your own professional expertise, you need to pay an appropriate amount of tax personally. Paying yourself a $50,000 salary while your company sits on $400,000 in profit doesn't pass the smell test.

Before you even reach the traffic lights, you need to clear two mandatory gateways:

• Commercial rationale gateway: your structure needs to make commercial sense beyond tax savings, such as asset protection or bringing in equity partners

• No high-risk features: there can be no complex financing arrangements designed to artificially shift profits

Clear both gateways, and your arrangement gets scored on a risk matrix that places you in the green, amber, or red zone, based on the proportion of profit returned to you personally versus the overall effective tax rate on that income.

The red zone in action

Jessica runs a boutique engineering consultancy with staff and an office. She comfortably passes the PSB tests. Her firm makes $600,000 in profit. To minimise tax, she pays herself a $60,000 salary and distributes the remaining $540,000 through a discretionary trust to her stay-at-home husband and university-aged children.

It looks great for the family's overall tax bill. It's a disaster for Jessica. Despite passing the PSB rules, she falls deep into the red zone under the traffic light system, because the share of profit she's personally taxed on is tiny compared to the value she generates. Aggressive arrangements like this attract audits where the ATO applies Part IVA anti-avoidance provisions, with significant penalties attached.

The green zone: where you want to be

The green zone means you're either paying yourself a high commercial salary, or the overall tax paid across the group on that income sits close to the top marginal rate. Land in the green zone, and the ATO generally won't apply compliance resources to review your structure. It might mean paying a little more tax today, but it's the difference between enduring stability and a structure that could collapse under audit.

Why You Need a Professional in Your Corner

Self-assessing your risk zone under PCG 2021/4 is difficult, and the cost of getting it wrong isn't a small adjustment. It's years of back taxes, interest, and penalties applied retrospectively.

If you're an IT contractor, an engineer, or running a professional firm, you need to know exactly where your structure sits before the ATO tells you. Aevum Accounting can review your arrangement, run the relevant ATO tests, and help you build a structure with the long-term stability to back it.

Click here to book a structure review with our team.

Disclaimer: The information and strategies shared in this article are for general informational purposes only and do not constitute specific tax or financial advice. Everyone's situation is unique, and tax laws are complex and constantly evolving. For personalised advice tailored to your specific individual or business needs, we always recommend consulting with a qualified professional at Aevum Accounting.