Nathan Haslewood. Contact

/super/ · chapter 04 of 10 · updated July 2026

The rules you can't break

The ATO doesn’t care about your intentions. They care about the rules. Here’s every rule that matters.

Key takeaways

  • The sole purpose test is the foundation of everything. Your SMSF

exists only to provide retirement benefits.

  • Related party rules determine who you can and can’t do business

with

  • Arm’s length requirements mean every transaction must be at market

rates

  • In-house asset limits cap how much you can have tied up with

related parties

  • Ignorance is not a defence. The penalties are severe.

Every super fund in Australia operates under a rulebook. It’s called the Superannuation Industry (Supervision) Act 1993, or the SIS Act for short. Catchy name, I know.

The SIS Act is 400-plus pages of legislation that tells you what you can and can’t do with superannuation money. It’s dense. It’s technical. And breaking it can cost you everything.

I’m not going to walk you through all 400 pages. Life’s too short. But I am going to walk you through the rules that matter most for SMSF property. The ones that trip people up. The ones the ATO watches like a hawk.

Get these right and you’ll sleep well at night. Get them wrong and you might find your fund declared non-complying, taxed at 45 per cent on everything, and your retirement plans in ruins.

No pressure.

Your super has a constitution

Think of the SIS Act as your super fund’s constitution.

Just like Australia has a constitution that sets out the rules for how the country works, your SMSF has the SIS Act setting out the rules for how the fund works.

You can’t just decide to ignore the constitution because it’s inconvenient. You can’t bend the rules because you think your situation is special. The rules are the rules.

And just like the government has courts to enforce the constitution, the ATO enforces the SIS Act. They have auditors. They have data matching. They have the power to investigate, penalise, and prosecute.

Respect the constitution.

The sole purpose test

If you remember nothing else from this chapter, remember this: the sole purpose test.

Section 62 of the SIS Act says your super fund must be maintained for the sole purpose of providing retirement benefits to members, or death benefits to their dependants.

That’s it. That’s the whole point of your SMSF. Retirement benefits. Nothing else.

Not tax minimisation. Not asset protection. Not helping your kids buy a house. Not giving you somewhere to holiday. Retirement benefits.

Every investment decision, every transaction, every action your SMSF takes must pass this test. Is this being done solely to provide retirement benefits?

If the answer is no, or even “mostly yes but also a little bit for another reason”, you’ve got a problem.

Let me give you some examples.

Fails the sole purpose test: Buying a holiday house through your SMSF and staying in it for a week each summer. Even if you pay “market rent” to the fund. Even if it’s only one week a year. The property is providing a current benefit to you, not a retirement benefit.

Fails the sole purpose test: Lending money from your SMSF to your adult child to help them buy their first home. Very generous. Also very illegal. Your fund exists to benefit you in retirement, not your kids right now.

Fails the sole purpose test: Buying artwork and hanging it in your living room. Yes, SMSFs can hold certain collectibles including art. No, you can’t display them in your home. They must be stored securely and insured, not enjoyed.

Passes the sole purpose test: Buying an investment property, renting it to an unrelated tenant at market rates, and using the rental income and eventual sale proceeds to fund your retirement. That’s exactly what the rules intend.

The sole purpose test is the foundation. Everything else builds on it.

The SIS Act has a lot to say about who counts as a “related party” and what you can and can’t do with them.

A related party includes you (obviously), your spouse, your children, your parents, your siblings, your grandparents and grandchildren, and the spouses of all of the above. It also includes any company or trust that you or your relatives control, and any business partners.

Basically, if you’re connected to someone by blood, marriage, or business, they’re probably a related party.

Why does this matter?

Because transactions with related parties are scrutinised heavily. The ATO knows that people are tempted to use their SMSF to benefit family members, or to do deals at non-market rates with people they know. So they watch these transactions like hawks.

Here are the key rules.

You cannot buy residential property from a related party. Full stop. Doesn’t matter if it’s at market value. Doesn’t matter if you get three independent valuations. Residential property from a related party is banned. No exceptions.

You cannot rent your SMSF residential property to a related party. Your son can’t live in the investment property your SMSF owns. Your parents can’t rent it. Even at market rates. Residential property must be rented to unrelated tenants.

You can buy business real property from a related party. This is a key exception. If the property is used wholly and exclusively in a business (like a factory, office, or shop), it can be purchased from a related party and even leased back to them. But it must meet strict definitions of “business real property”.

You can lease commercial property to your own business. This is one of the most powerful SMSF strategies for business owners. Your SMSF buys the premises, and your business pays rent to the fund. We’ll cover this in detail in the next chapter.

The related party rules exist to stop people using super as a family bank. Respect them.

Helen and Bruce get it wrong

Character check-in: Helen and Bruce Thompson

Ages: Late 50s

Combined super: $1.2 million

Situation: SMSF holds residential property worth $850,000 plus shares and cash. Their daughter just got engaged.

Helen and Bruce’s daughter Sophie just got engaged. She and her fiancé are looking for their first home, and the rental market is brutal. Sophie mentioned that she wished she could rent somewhere stable while they saved for a deposit.

Helen had a brainwave. “We’ve got that investment property in the SMSF. It’s between tenants right now. Why don’t we let Sophie and Jake rent it for a year or two while they save? We’ll charge them the same rent anyone else would pay. It’s not like we’re giving them a discount.”

This is exactly the kind of thinking that gets people into trouble.

It doesn’t matter that Sophie would pay market rent. It doesn’t matter that Helen’s intentions are good. Renting SMSF residential property to a related party is prohibited. Full stop.

If Helen went ahead with this plan and the ATO found out (which they probably would, through data matching or the annual audit), the consequences could include a formal warning, mandatory rectification (evicting Sophie), financial penalties, or in serious cases, the fund being declared non-complying.

A non-complying fund is taxed at 45 per cent on its entire balance. On $1.2 million, that’s $540,000 gone. More than enough to ruin a retirement.

Helen’s accountant talked her out of it. Sophie found a rental elsewhere. Crisis averted.

But this stuff happens all the time. People think their situation is different. It’s not.

Arm’s length requirements

Even when you can do business with related parties (like commercial property), you must do it at arm’s length.

Arm’s length means the transaction must be conducted as if the parties were strangers. Market rates. Proper documentation. No special favours.

If your SMSF owns a commercial property and leases it to your business, the rent must be market rent. Not “mates rates”. Not a discount because times are tough. Market rent, as determined by an independent valuation.

If you pay below market rent, the ATO can hit you with something called NALI, which stands for Non-Arm’s Length Income. Any income tainted by NALI is taxed at 45 per cent instead of the normal 15 per cent super rate.

That’s not a typo. 45 per cent.

And it gets worse. Recent changes mean NALI can apply to the entire fund’s income, not just the tainted transaction. One dodgy deal can contaminate everything.

The arm’s length rules apply to more than just rent. They apply to any service or transaction between the fund and related parties. If your brother-in-law is a plumber and he does work on your SMSF property, he needs to charge what any plumber would charge. If your daughter is a property manager, she needs to charge market rates.

Document everything. Get valuations. Keep it professional.

In-house asset rules

The in-house asset rules limit how much of your SMSF can be tied up in transactions with related parties.

An in-house asset is an investment in, or loan to, a related party. It also includes assets leased to related parties.

The rule: in-house assets cannot exceed 5 per cent of your fund’s total assets.

There’s an important exception. Business real property leased to a related party doesn’t count as an in-house asset. This is why the commercial property strategy works. You can have your SMSF own your business premises and lease it to your business without breaching the 5 per cent limit.

But if you had other in-house assets as well (say, a loan to a related company), those would count towards the limit.

If your in-house assets exceed 5 per cent, you must prepare a written plan to reduce them below 5 per cent by the end of the following financial year. Fail to do so and you’re in breach.

What you can and can’t acquire

Let’s make this crystal clear.

Your SMSF can acquire:

  • Residential property from an unrelated party

  • Commercial property from anyone (including related parties if it’s business real property)

  • Listed shares and managed funds

  • Certain collectibles (with strict storage and insurance rules)

  • Cash and term deposits

  • Business real property from a related party

Your SMSF cannot acquire:

  • Residential property from a related party (ever)

  • Assets from a related party unless they’re listed securities, business real property, or in-house assets under 5 per cent

  • Assets for the purpose of providing current benefits to members

  • Assets that would breach the sole purpose test

When in doubt, ask your SMSF accountant before you acquire anything. It’s much easier to avoid a breach than to fix one.

What happens when you break the rules

The ATO has a graduated system of penalties for SMSF breaches.

Level 1: Education direction. For minor breaches, the ATO might simply require you to complete an approved education course. Consider it a slap on the wrist.

Level 2: Rectification direction. You must fix the breach within a specified timeframe. Sell the asset, repay the loan, evict the related party tenant.

Level 3: Administrative penalties. Financial penalties that can run into thousands of dollars per breach. These add up quickly if there are multiple issues.

Level 4: Trustee disqualification. You can be banned from being a trustee of any super fund. If you’re disqualified, you must wind up your SMSF and roll the benefits to another fund.

Level 5: Non-complying fund. The nuclear option. Your fund loses its complying status and is taxed at 45 per cent on its entire balance. This is catastrophic. It can destroy a retirement.

The ATO generally tries to educate before they punish. Most breaches, if caught early and rectified, won’t result in the worst penalties. But repeat offenders, deliberate breaches, or situations where members have clearly received inappropriate benefits get hit hard.

Don’t rely on the ATO being lenient. Follow the rules.

How the ATO catches you

Some people think they can get away with bending the rules because nobody’s watching.

The ATO is watching.

They use data matching to cross-reference SMSF transactions with land title records, rental bond databases, company records, and more. If your SMSF buys a property and your daughter’s name appears on a rental agreement for that property, they’ll know.

Your annual audit is another checkpoint. Every SMSF must be audited by an independent auditor each year. The auditor is legally required to report breaches to the ATO. They’re not on your side. They’re on the side of compliance.

Then there’s the tip-off line. Disgruntled ex-spouses, angry business partners, and bitter relatives have all been known to dob in SMSF trustees. Family disputes are a rich source of ATO referrals.

And sometimes people just get unlucky. The ATO conducts random audits. You might be selected for review even if you’ve done nothing wrong. If your records are clean, no problem. If there’s anything dodgy, it will come out.

The point is: assume you’ll be caught. Because you probably will be.

The mindset shift

Here’s how I think about SMSF compliance.

Every transaction, every decision, every investment, I imagine having to explain it to an ATO auditor. Not a friendly auditor who gives me the benefit of the doubt. A sceptical auditor who’s looking for problems.

Could I explain, with documentation, why this transaction is legitimate? Could I show that it passes the sole purpose test? Could I demonstrate that it was conducted at arm’s length?

If the answer is yes, I proceed. If there’s any doubt, I get advice before I act.

This mindset shift turns compliance from a burden into a habit. It becomes automatic. You stop even considering transactions that might be questionable because they don’t pass the “explain it to an auditor” test.

That’s the mindset of a good trustee.

The rules exist for a reason

I know this chapter has been heavy on rules and penalties. It might feel like the ATO is out to get you.

They’re not.

The rules exist because super is taxpayer-subsidised. The tax concessions on super cost the government billions of dollars a year. In return for those concessions, there are rules about how the money can be used.

Super is for retirement. Not for helping family. Not for personal benefit now. For retirement.

If you can accept that framework, the rules make sense. They’re not arbitrary. They’re designed to make sure super does what it’s supposed to do.

Follow the rules, and you’ll never have a problem. The ATO is not interested in compliant funds. They’re interested in funds that break the rules.

Don’t be one of those funds.

Action step

Review the Related Party Diagram in Appendix E.

Map out your own related party network:

  • Who are your relatives? (Parents, children, siblings, grandparents,

grandchildren)

  • Who are their spouses?

  • What companies or trusts do you or they control?

  • Who are your business partners?

Anyone on this map is someone you need to be careful about when it comes to SMSF transactions.

If you’re planning any transaction with anyone on this map, get advice from your SMSF accountant first.

Find your sweet spot, or have the guts to walk away.

General information only, not financial advice. This book does not consider your objectives, financial situation or needs. Rules changed materially in 2026 and keep moving: verify anything here with the ATO or an SMSF specialist before acting. Full disclaimers.