You distribute income from your family trust each year. You follow a strategy that’s worked for years. Then the ATO sends a letter questioning whether those distributions trigger section 100A, and suddenly you’re facing the prospect of tax being assessed at 47% in the trustee’s hands.
The question isn’t whether section 100A exists. It’s whether your arrangement falls within the ordinary family or commercial dealing exception that keeps most genuine family and business structures outside the ATO’s reach.
That exception is your defence. But here’s the problem: most advisors and business owners don’t know how to build it, evidence it, or explain it when the ATO comes asking.
This article is your guide to understanding what the ordinary family or commercial dealing exception actually means, how the ATO and courts test whether your arrangement qualifies, and what you need to do to keep legitimate trust distributions out of dispute.
Key Takeaways
- Section 100A only applies if a ‘reimbursement agreement’ exists and the ordinary family or commercial dealing exception is the primary way to stay outside that definition
- The exception protects genuine arrangements driven by real family or commercial objectives, even where tax efficiency is part of the picture
- The test is objective, the ATO and courts look at the whole dealing, not just what you intended, to determine if the arrangement is ordinary or artificial
- Common strategies aren’t automatically safe, distributing to adult children, corporate beneficiaries, or related entities can still be ordinary dealing, but only if properly structured and evidenced
- Documentation matters more than most advisors realise, you need contemporaneous records that demonstrate family or commercial objectives, not tax-focused retrospective explanations
- The ATO has drawn clear boundaries, simple, transparent arrangements with genuine non-tax drivers sit in the white zone, while complex circular structures with no commercial substance are red zone targets
Why Section 100A Suddenly Matters to Your Practice
Section 100A sat dormant for decades. Most tax advisors knew it existed but treated it as a theoretical provision that rarely saw the light of day.
That changed dramatically in 2022 when the ATO released draft (and then final) guidance signalling their intent to scrutinise trust distributions far more aggressively. The Commissioner’s focus centres on arrangements where a beneficiary is entitled to trust income on paper, but someone else enjoys the real economic benefit.
The retrospective nature of section 100A makes this particularly dangerous. The provision applies to income years dating back to 1979. If the ATO successfully argues that section 100A applies to historical distributions, the trustee can be assessed at the top marginal rate plus Medicare levy (currently 47%) on income that beneficiaries already reported and paid tax on.
For accountants and advisors, this creates immediate risk. Strategies that have operated for years without challenge, distribution patterns that felt sensible and tax-efficient, structures that balanced family objectives with asset protection, all of these are now under potential review.
Can you explain, with confidence, why your clients’ trust distributions fall outside section 100A? If the ATO challenges an arrangement, can you demonstrate that it qualifies as an ordinary family or commercial dealing?
If not, you’re navigating without a roadmap in territory that the ATO is actively patrolling.
Section 100A isn’t new law, but the ATO’s willingness to apply it aggressively is. The ordinary family or commercial dealing exception has become the single most important provision for protecting legitimate trust structures from review and reassessment.
What the Ordinary Family or Commercial Dealing Exception Actually Means
Section 100A applies where there’s a “reimbursement agreement”. That term is defined extraordinarily broadly in the legislation. It catches any arrangement where a beneficiary is entitled to trust income, but someone else receives the actual benefit, and one of the purposes (not necessarily the dominant purpose) is reducing tax.
The ordinary family or commercial dealing exception sits within the definition of reimbursement agreement itself. It says that an agreement is not a reimbursement agreement if it was entered into in the course of ordinary family or commercial dealing.
This isn’t a technical loophole or a narrow carve-out. It’s the primary mechanism that keeps genuine family trust arrangements and legitimate business structures outside section 100A’s scope.
Think of it this way: section 100A is designed to catch artificial arrangements where the form (who’s entitled to income) doesn’t match the substance (who really benefits) and tax reduction is part of the motive. The ordinary dealing exception recognises that families and businesses routinely enter into arrangements where income flows one way on paper but benefits flow differently in practice, for entirely genuine reasons.
Parents distribute income to adult children who use it for education or living expenses. A family trust distributes to a corporate beneficiary to fund business expansion or manage commercial risk. A business structure allocates profits to entities based on roles, contributions, or long-term wealth planning objectives.
These can all involve someone other than the named beneficiary enjoying benefits. They often have tax efficiency as part of the calculus. But if they’re grounded in real family or commercial objectives and reflect how this family or business actually operates, they fall within ordinary dealing.
The exception protects substance over form, but only where the substance is genuine.
The ordinary family or commercial dealing exception isn’t a safe harbour you tick and forget. It’s a factual characterisation that depends on how your arrangement actually works, what drives it, and whether it looks natural for this family or business in this context.
How the ATO and Courts Test Whether a Dealing Is ‘Ordinary’
The word “ordinary” does a lot of work in this exception. It’s not defined in the legislation, so courts and the ATO have developed tests to distinguish ordinary dealings from extraordinary, artificial, or contrived ones.
The starting point is objective. The question isn’t whether you subjectively believed the arrangement was ordinary. It’s whether, looking at the whole course of dealing, the arrangement can be objectively characterised as ordinary family or commercial dealing in the context of this particular family or business.
Courts contrast “ordinary” with “extraordinary”. An ordinary dealing is one that’s typical, usual, or natural for the family or business in question. It might not be common across all families or all businesses, but it makes sense for this one, given their history, relationships, commercial activities, and objectives.
An extraordinary dealing, by contrast, is one that’s unusual, artificial, or contrived. It involves steps that don’t have independent commercial or family rationale. It’s more complex than it needs to be. It looks like it exists primarily to engineer a tax outcome.
The ATO’s guidance in TR 2022/4 emphasises several factors:
The whole dealing matters, not just isolated steps. You can’t cherry-pick favourable elements and ignore the parts that look artificial. The ATO looks at the entire arrangement: how distributions are made, how funds flow, what happens after the beneficiary receives their entitlement, and what the ultimate economic effect is.
The focus is on objectives, not just mechanics. What drives the arrangement? Is it genuine family support, business risk management, capital retention, or wealth succession planning? Or is it primarily about getting income taxed in the hands of a low-rate beneficiary while preserving control and economic benefit for someone else?
Artificiality and contrivance are red flags. If the arrangement involves unnecessary complexity, circular flows of funds, or steps that have no purpose other than creating the appearance of compliance, courts and the ATO will characterise it as extraordinary. The Federal Court’s decisions in Guardian and Blood Enterprises made this clear: arrangements that feel contrived or divorced from commercial reality struggle to qualify as ordinary dealing.
Tax awareness doesn’t kill the exception. This is critical. Many advisors panic and assume that if tax reduction is anywhere in the mix, ordinary dealing is off the table. That’s wrong. Families and businesses are entitled to structure affairs tax-effectively. The question is whether tax is the only driver, or whether genuine family or commercial objectives exist alongside tax efficiency.
Can you articulate the non-tax reasons for your client’s distribution pattern? If the tax benefit disappeared tomorrow, would the arrangement still make sense for this family or business?
If yes, you’re likely in ordinary dealing territory. If the only reason the arrangement exists is tax, you’re not.
The test is practical, not academic. Courts and the ATO don’t expect families to ignore tax. They expect arrangements to be grounded in real-world objectives that go beyond tax outcomes, structured in a way that’s proportionate and explainable.
Common Trust Distribution Patterns: Where They Sit on the Risk Spectrum
Let’s get concrete. You’re advising clients on trust distributions, or you’re reviewing arrangements that have operated for years. Where do common strategies sit on the risk spectrum?
Distributions to Adult Children on Low Incomes
A family trust distributes income to adult children who are university students or in low-income jobs. The children report the income and pay tax at their marginal rates. Funds are used for education, living expenses, or saved for their future.
Risk assessment: This can be ordinary family dealing, but it depends heavily on execution. If the children have genuine entitlement, the funds are actually applied to their benefit (even if parents pay some expenses directly), and there’s a history of family support, the arrangement is defensible.
It starts looking extraordinary if the children receive distributions on paper but have no real access to the funds, parents control everything, and money circles back to benefit the parents’ lifestyle or business without genuine family rationale. The ATO’s concern is when adult children are used as low-tax receptacles with no meaningful economic benefit flowing to them.
Corporate Beneficiaries and Retained Profits
A family trust distributes income to a corporate beneficiary. The company retains profits to fund business expansion, manage working capital, or hold investments. The corporate tax rate applies (currently 25% or 30% depending on size).
Risk assessment: This is often ordinary commercial dealing, provided there’s genuine business rationale. Asset protection, business reinvestment, and capital retention are all legitimate commercial objectives. The fact that the corporate rate is lower than the trustee top rate is not fatal.
The arrangement becomes problematic if the corporate beneficiary is a shell with no real activity, profits are immediately stripped out through loans or dividends that benefit individuals (not the business), or the structure exists solely to warehouse income at corporate rates without genuine commercial purpose.
Loan-Back Arrangements to Parents or the Business
Trust income is distributed to a beneficiary, and shortly afterward, the beneficiary “lends” funds back to parents, the trustee, or an associated business entity.
Risk assessment: High risk. This pattern is a classic target for section 100A scrutiny. The ATO sees it as form over substance: the beneficiary is entitled to income, but the real benefit flows back to the original controllers.
It’s not automatically fatal, but you need strong commercial or family justification. Is the loan genuinely commercial (market interest, documented terms, genuine expectation of repayment)? Does the beneficiary have independent reasons to make the loan (investment return, support for family business)? Or is the loan a mechanism to get the distribution taxed at the beneficiary’s rate while ensuring funds remain available to the parents?
If it’s the latter, and particularly if loans are circular, interest-free, or never repaid, you’re in dangerous territory.
Distributions to Multiple Low-Income Beneficiaries
A family trust distributes income across several low-income family members (parents, adult children, siblings) to utilise their tax-free thresholds and lower marginal rates.
Risk assessment: Depends entirely on what happens next. If each beneficiary genuinely receives their entitlement and benefits from it (uses it for their own expenses, saves it, invests it under their control), this can be ordinary family dealing, particularly where there’s a history of shared family resources and mutual support.
If distributions are nominal, beneficiaries have no real access, and funds are pooled or controlled centrally by one family member for purposes unrelated to the beneficiaries’ own interests, the ATO will argue it’s a reimbursement agreement dressed up as family generosity.
Complex Intercompany and Intertrust Structures
Multiple trusts distribute to corporate beneficiaries, which then lend to other entities, invest in related structures, or distribute dividends up a chain.
Risk assessment: Not automatically problematic, but complexity invites scrutiny. The ATO and courts are alert to arrangements where multiple steps achieve a result that could have been reached more simply, or where complexity obscures who really benefits.
If each step has independent commercial or family rationale, the overall structure can still be ordinary dealing. If steps are circular, serve no purpose other than tax deferral or rate arbitrage, and create unnecessary opacity, you’re moving into extraordinary territory.
The Blood Enterprises case made clear that complexity for complexity’s sake, or structures that feel artificial when viewed as a whole, won’t be protected by the ordinary dealing exception.
Risk isn’t binary. Most arrangements sit somewhere on a spectrum between clearly ordinary and clearly artificial. Your job as an advisor is to assess where each client sits, identify vulnerabilities, and either simplify the structure or strengthen the evidence that supports ordinary dealing characterisation.
Building the Ordinary Dealing Defence: Evidence and Narrative
If the ATO challenges a distribution and invokes section 100A, you’ll need to demonstrate that the arrangement qualifies as ordinary family or commercial dealing. That’s not a legal argument you construct after the fact. It’s a factual case you build from the beginning.
Start With Clear Objectives
Can you articulate why the distribution was made this way? What were the family or commercial objectives driving the decision?
Don’t answer with “tax efficiency” or “utilising the beneficiary’s tax-free threshold”. Those are outcomes, not objectives. What were the real reasons?
- Supporting adult children through education or early career.
- Retaining capital in a business structure for expansion or risk management.
- Succession planning, gradually transferring wealth to the next generation.
- Pooling family resources for shared investment or development projects.
- Managing business risk by separating trading income from personal assets.
If you can’t answer this clearly, the arrangement is vulnerable. If the only honest answer is “to pay less tax”, the ordinary dealing exception won’t save you.
Document Decisions Contemporaneously
The best evidence is contemporaneous records that show why decisions were made at the time, not explanations constructed years later when the ATO asks questions.
What should you be documenting?
- Trust minutes and resolutions that record not just the distribution itself but the reasons for it. “Distribute $X to adult child Y to support tertiary education and living expenses” is far stronger than “Distribute $X to Y”.
- Family governance discussions, where relevant. If your family has regular meetings about finances, wealth planning, or business strategy, minutes or notes from those discussions showing how trust distributions fit into broader family objectives are powerful.
- Board minutes for corporate beneficiaries, explaining why the company received the distribution and what it will do with the funds. “Retain profits to fund equipment purchase and working capital for business expansion” is clear commercial rationale.
- Commercial agreements or investment plans that show distributions were made to enable a beneficiary to participate in a business venture, investment, or development project.
- Loan agreements, if loans are involved, with commercial terms, clear repayment schedules, and genuine expectation of enforcement. Informal, interest-free, indefinite “loans” that are really reclassifications of distributions look artificial.
None of this needs to be elaborate. A simple, clear record at the time the decision was made is worth more than pages of retrospective explanation.
Show Consistency and History
Ordinary dealing is easier to establish if you can show the arrangement is consistent with how this family or business has operated over time.
Has the family always supported children through university? Have distributions to the corporate beneficiary consistently funded business activities over multiple years? Is there a long-term wealth planning strategy that distributions fit within?
Consistency doesn’t mean you can’t adapt or change approach. But it does mean you need to explain changes in the context of evolving circumstances, not as sudden reactions to tax outcomes.
Be Prepared to Explain the Whole Dealing
The ATO won’t just look at the distribution resolution. They’ll trace what happened to the funds after the beneficiary became entitled.
Where did the money go? Was it used for the stated purpose? Did it genuinely benefit the beneficiary, or did it circle back to benefit someone else?
You need to be able to explain the entire flow of funds and demonstrate that it aligns with the stated family or commercial objectives.
Tie Tax Outcomes to Non-Tax Drivers
Yes, tax efficiency was part of the consideration. But can you show it wasn’t the only consideration, or even the primary one?
Frame the narrative around the real objectives, and position tax efficiency as a natural consequence of sensible family or commercial decision-making, not the driving force.
“We distributed to the corporate beneficiary because we needed to retain capital in the business for expansion. The corporate tax rate applied, which was appropriate for a commercial entity retaining profits.”
“We distributed to adult children because we’ve always supported them financially through education and early career. The distributions were taxed in their hands at their marginal rates, which reflected their actual economic position.”
The difference between these explanations and “we did it to pay less tax” is the difference between ordinary dealing and a reimbursement agreement.
The ordinary dealing defence is built from evidence, consistency, and clear articulation of objectives. You can’t manufacture it retrospectively if the fundamentals aren’t there. But if the arrangement is genuinely driven by family or commercial reasons, documenting that properly turns a defensive position into a strong defence.
Responding When the ATO Invokes Section 100A
You receive a letter from the ATO. They’re reviewing trust distributions. They believe section 100A may apply. They’re asking for information and explanations.
This is the moment the ordinary dealing exception shifts from theory to practical defence strategy.
Understand What the ATO Must Prove
Section 100A only applies if four elements are satisfied:
- A beneficiary is presently entitled to trust income.
- An agreement exists.
- Under that agreement, another person receives or will receive a benefit (financial or otherwise).
- A purpose of the agreement is reducing tax.
If any element fails, section 100A doesn’t apply. The ordinary family or commercial dealing exception operates at element two: if the agreement was entered into in the course of ordinary family or commercial dealing, it’s not a “reimbursement agreement” within the statutory definition, and the entire provision falls away.
Your response strategy should focus on demonstrating that the arrangement was ordinary dealing. That becomes your primary line of defence.
Gather and Present Evidence Strategically
The ATO will ask for trust deeds, distribution minutes, financial records, and explanations of how funds were applied. They’ll want to understand the relationships between parties and the history of arrangements.
Don’t just dump documents. Present a coherent narrative supported by evidence:
- Start with the family or business context. Explain who the parties are, what their relationships are, and what the family or business structure is designed to achieve.
- Explain the distribution in the context of objectives. Show why the distribution was made, what purpose it served, and how it fit within the family’s or business’s broader strategy.
- Provide contemporaneous documentation that supports those objectives: minutes, governance records, commercial agreements, investment plans.
- Trace the flow of funds and demonstrate that they were applied consistently with stated objectives, not redirected to achieve a tax outcome divorced from genuine family or commercial purposes.
- Highlight consistency and history where relevant. Show this wasn’t a one-off arrangement engineered for tax, but consistent with long-term patterns.
The narrative is as important as the documents. You’re building a case that the arrangement was ordinary dealing, not defending against an accusation that you did something wrong.
Know When to Object and When to Engage
If the ATO issues an amended assessment invoking section 100A, you have objection rights. The objection is your formal challenge to the assessment and the mechanism that allows you to escalate to litigation if necessary.
But objections don’t preclude engagement. Often, the most effective strategy is a combination: object to protect your rights and preserve the statutory timeframes, but also engage substantively with the ATO to present the ordinary dealing case before it escalates to dispute.
This is where litigation experience becomes valuable. Advisors who understand how the ATO will test evidence, how courts assess factual disputes, and how to frame a case for objection or settlement can position you far more effectively than accountants or tax advisors operating alone.
Position for Settlement or Litigation
Not every case settles. Some proceed to litigation. If your arrangement genuinely qualifies as ordinary family or commercial dealing, you may need to litigate to prove it.
But even if settlement is the likely outcome, framing your position with reference to how it would be tested in court strengthens your negotiating position. The ATO is more likely to concede or compromise if they recognise the case is defensible and could fail if litigated.
Litigation-focused firms understand the evidential requirements, the way courts assess credibility and documentary proof, and the strategic calls that determine whether to hold firm or negotiate. That perspective should inform your approach from the first ATO letter, not after months of back-and-forth have weakened your position.
When the ATO invokes section 100A, your response isn’t a compliance exercise. It’s the opening move in a potential dispute. Respond strategically, present evidence coherently, and position the ordinary dealing exception as your primary defence from day one.
Practical Steps for Advisors Before Year-End and After a Review Letter
You’re either advising clients on distributions before year-end, or you’re managing a situation where the ATO has raised section 100A concerns. Here’s what you should be doing.
Before Year-End: Building Defensible Arrangements
Map distributions to objectives. Before you finalise distribution resolutions, sit down with your client and work through what they’re trying to achieve. Is this about family support, business capital retention, succession planning, risk management? Get clarity, and document it.
Identify and address red flags. If a distribution pattern involves loan-backs, circular flows, or beneficiaries with no genuine economic benefit, flag it. Either simplify the arrangement or ensure there’s strong commercial or family rationale and that it’s properly documented.
Draft clear, purposeful minutes. Your distribution resolutions should record not just who gets what, but why. A sentence explaining the rationale is worth pages of retrospective explanation later.
Advise clients on record-keeping. Make sure they understand the importance of documenting how funds are used, particularly if they’re distributed to corporate beneficiaries or for specific family or business purposes. Bank records, investment documentation, and evidence of expenditure all matter.
Assess whether structures are more complex than necessary. If your client’s trust and company arrangements involve multiple layers, intercompany loans, and circular flows, ask whether each step serves a genuine purpose. If the answer is unclear, consider simplifying. Complexity invites scrutiny.
After a Review Letter: Responding Strategically
Don’t panic, and don’t ignore it. ATO reviews are serious, but they’re not the same as an assessment. You have time and opportunity to present your case.
Gather evidence immediately. Trust deeds, minutes, financial records, correspondence, governance documents. Pull together everything that shows the history, context, and rationale for the arrangement.
Engage specialist advice early. If section 100A is raised, you’re in dispute territory. Tax accountants and general advisors may not have the litigation experience or strategic framing skills to position the case effectively. Bring in advisors who understand how the ATO tests these cases and how courts assess them.
Frame the response around ordinary dealing. Your primary argument is that the arrangement was entered into in the course of ordinary family or commercial dealing and therefore falls outside section 100A. Build the narrative and evidence around that defence.
Consider objection strategy from the outset. If the ATO proceeds to amend the assessment, you’ll need to object within strict timeframes. Think about objection strategy early, even while engaging substantively with the ATO during the review.
Be prepared for negotiation or litigation. Some cases settle. Some require litigation to resolve. Position yourself with that reality in mind: strong evidence, clear narrative, and advisors who can support either path.
Whether you’re planning distributions or responding to ATO scrutiny, the ordinary family or commercial dealing exception should be front of mind. Build it into your advice before year-end. Frame it as your primary defence if the ATO asks questions.
Where Ordinary Dealing Meets Dispute Strategy
The ordinary family or commercial dealing exception isn’t just a technical provision. It’s the single most important protection for legitimate trust distributions under section 100A.
But protection requires more than ticking a box or hoping the ATO doesn’t look too closely. It requires clear objectives, proper documentation, and the ability to demonstrate that your arrangement is grounded in genuine family or commercial reality, not engineered purely for tax.
Most advisors and business owners don’t realise how much of this case is built or lost in the planning and documentation stage. By the time the ATO raises section 100A, the facts are largely set. Your ability to defend the arrangement depends on decisions you made, and records you kept, years earlier.
If you’re advising on trust distributions, ask yourself: could I defend this as ordinary family or commercial dealing if the ATO challenged it? Can I articulate the objectives? Do I have contemporaneous evidence? Would the arrangement make sense even if the tax outcome changed?
If the answer to any of those questions is uncertain, you have work to do before year-end.
And if the ATO has already raised section 100A concerns, the ordinary dealing exception is your primary line of defence. Frame your response around it. Build the evidentiary case. And bring in advisors who understand how these disputes are tested, because that’s where the outcome is decided.
Litigation is complex, yes. But the pathway to defending your trust distributions under section 100A shouldn’t be. It starts with understanding what ordinary family or commercial dealing really means, documenting it properly, and being prepared to prove it if challenged.
Disclaimer: This article provides general information only and does not constitute legal advice. Section 100A is a complex provision with significant retrospective implications. If you are facing ATO scrutiny of trust distributions or need advice on whether arrangements qualify as ordinary family or commercial dealing, you should seek specialist legal advice tailored to your specific circumstances.
