Section 100A and Trust Distributions: What You Need to Know

Section 100A is the anti-avoidance rule that reshaped how family trusts distribute income. It lets the Australian Taxation Office (ATO) look through a trust distribution in which a beneficiary is presently entitled, but someone else receives the benefit, and the arrangement was designed to reduce tax. When it applies, the distribution is disregarded, and the trustee is taxed on that income at the top marginal rate. For family groups that have long been distributed to adult children or related companies, understanding this rule is no longer optional.

This guide explains what section 100A is, the four things that make a reimbursement agreement, the ordinary family dealing exception that is your main defence, the ATO's green, blue and red risk zones under PCG 2022/2, what the Guardian and BBlood cases decided, and the practical steps to keep your trust distributions in the safe zone.

What Section 100A Actually Does

Section 100A was enacted in 1979 but sat largely dormant until the ATO issued detailed guidance in 2022. It targets what the law calls a reimbursement agreement: an arrangement in which a beneficiary is made entitled to trust income on paper, but the economic benefit flows to someone else, and the purpose of the structure is to reduce the total tax paid. When the rule bites, the beneficiary's entitlement is treated as never having existed, and the trustee is assessed under section 99A at the top marginal rate plus Medicare, currently 47%.

What a Family Trust Election Does

Making an FTE gives a discretionary trust access to concessions it cannot reliably use otherwise. The three that matter most:

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  It lets the trust pass on franking credits. Without an FTE, a trust that receives franked dividends may fail the holding period rule and be unable to stream those franking credits to beneficiaries. With an FTE, the trust is treated as a single entity for that test, so the credits flow through.
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  It preserves carry-forward trust losses. An FTE replaces the more onerous trust loss tests (the control test, the same business test and the income injection test) with a single family control test. This makes it far easier to keep using tax losses if the trust's circumstances change.
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  It simplifies company loss ownership tests and reporting. Where the trust is a major shareholder in a company with losses, an FTE lets the trust be treated as a single entity, simplifying the company's ownership tests. Trusts with an FTE are also excluded from the trustee beneficiary reporting rules.

The Four Elements of a Reimbursement Agreement

Section 100A only applies if all four of the following are present. If anyone is missing, there is no reimbursement agreement in place, and the rule does not apply. This is the framework that the Full Federal Court confirmed in Guardian.

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  Present entitlement. A beneficiary is presently entitled to a share of the trust's income.
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  An agreement. That entitlement arises from, or is connected to, a pre-existing agreement, arrangement or understanding between two or more parties.
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  A benefit to another person. Under the agreement, someone other than the entitled beneficiary receives a benefit (money, property or otherwise).
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  A tax reduction purpose. A purpose of the agreement was that some person would pay less income tax than they otherwise would have.

The ATO Risk Zones Under PCG 2022/2

In December 2022, the ATO released Taxation Ruling TR 2022/4 (its interpretation of the law) and Practical Compliance Guideline PCG 2022/2 (how it will apply its resources). The PCG sorts arrangements into colour-coded risk zones. Knowing which zone your distribution sits in tells you how much ATO attention to expect.

The Adult Child Distribution: The Classic Red Zone

The arrangement the ATO flagged most directly in Taxpayer Alert TA 2022/1 is the distribution to an adult child, whose money is then enjoyed by the parents. A trust distributes to a university-age child on a low marginal rate, the child is made presently entitled on paper, but the parents keep and spend the funds. The tax saved is the gap between the child's low rate and the parents' high rate.

Unpaid Present Entitlements and Division 7A

A distribution can create an unpaid present entitlement (UPE), in which the beneficiary is entitled to the income, but the cash remains in the trust. UPEs are a common section 100A pressure point. If a beneficiary allows an entitlement to remain unpaid, or forgives or converts it to a loan, the ATO may treat that as a sign of a reimbursement agreement, particularly where the retained funds are used to benefit someone else.

UPEs owed to a corporate beneficiary carry a second problem: Division 7A. Where a trust distributes to a company (a bucket company) but keeps the cash, the unpaid entitlement can be treated as a loan from the company back to the trust. Unless it is paid or included in a complying Division 7A loan agreement before the company's lodgement day, it may be treated as a deemed dividend and taxed accordingly. Distributing to a company set up as a corporate beneficiary can cap the tax rate, but only if the cash and the paperwork are handled correctly.

What Guardian and BBlood Decided

Two Federal Court cases shaped how section 100A is now read.

Guardian (FCAFC, January 2023)

In the Guardian appeal, the Full Federal Court found that section 100A did not apply because no agreement existed when the beneficiary was made presently entitled. The decision underlined that you must work through the reimbursement agreement requirements in order, and establish that an agreement actually existed at the relevant time, before section 100A can operate. Importantly, the Court still found that the general anti-avoidance rule in Part IVA applied to one income year, a reminder that clearing section 100A does not clear Part IVA.

BBlood (Federal Court, 2022)

BBlood went the other way. The arrangement, involving a share buy-back that transferred more than $10 million in value, was held to be a reimbursement agreement rather than an ordinary family or commercial transaction. Between them, the two cases show the line: a genuine distribution a family actually acts on can be defensible, while an engineered arrangement designed to move value while minimising tax is exposed.

How to Keep Your Trust Distributions Compliant

Section 100A rewards trustees who run their distributions as real economic events rather than paper entries. Practical steps:

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  Pay entitlements where you can. The cleanest green zone position is the beneficiary actually receiving their distribution in cash.
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  Document the resolution before 30 June. Make and minute the trustee's resolution for each beneficiary before year-end, in accordance with the trust deed.
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  Keep UPEs clean. If an entitlement stays in the trust, retain it as genuine working capital or put it on commercial loan terms. Avoid forgiving or quietly redirecting it.
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  Handle bucket company UPEs under Division 7A. Pay the entitlement or place it on a complying loan before the company's lodgement day.
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  Match the paperwork to reality. Make sure that whoever is entitled on paper is the one who actually benefits. Mismatches are the single biggest red flag.

If you are unsure whether a past distribution is exposed, a review now is far cheaper than an amended assessment later. Our registered tax agents in Adelaide can assess your trust's distribution history against the PCG risk zones, and our guide to avoiding a tax audit covers the ATO's broader focus on trusts.

Section 100A and Family Trust Elections

It is worth being clear on one point: a family trust election does not protect you from section 100A. A family trust election fixes the family group, so distributions within it avoid the family trust distribution tax, but even an in-group distribution can be attacked under section 100A if it is really a reimbursement agreement. The two rules operate independently, and a distribution needs to satisfy both. For trusts holding assets, our family trust tax return service works through each year.

How The Kalculators Can Help

We prepare trust distribution resolutions that reflect genuine entitlements, assess each distribution against the PCG 2022/2 risk zones, manage bucket company UPEs under Division 7A, and review historical distributions where section 100A exposure is a concern. If you are setting up a new structure, our trust registration and business advisory services in Adelaide build the distribution strategy from the start.