Guide · Last Updated 4 August 2026
Related-Party Rent and the Arm’s Length Rule
The most common commercial SMSF arrangement, the tax trap sitting inside it, and the one piece of evidence that keeps auditors comfortable.
William Spark, Founder & Director
2025 SMSF Adviser Awards, Newcomer of the Year Winner · About
What Happens if My SMSF Charges Below-Market Rent to a Related Party?
Below-market rent to a related party breaches the arm’s length requirement in section 109 of the SIS Act. The rental income risks being treated as non-arm’s length income, taxed at the top marginal rate rather than concessional rates, and your auditor may lodge a contravention report. A market rent assessment is the protective evidence.
This question comes up constantly because the underlying arrangement is so common and so sensible. A business owner holds the shop, warehouse or surgery in their SMSF and the business pays rent to the fund. Superannuation law allows exactly this for business real property. What it does not allow is mates’ rates.
Why the Arrangement Is Legal and the Discount Is Not
Business real property is the standing exception to the rule against related-party dealings, which is why leasing your own premises from your fund is one of the most popular commercial SMSF strategies in the country. Section 109 of the SIS Act attaches one condition: every dealing between the fund and a related party must be on terms no more favourable than an arm’s length deal. The lease must look like one a stranger would sign, and the rent must be what a stranger would pay.
Charging the business less than market rent fails that test. It also quietly moves value out of the superannuation system, which is precisely what the rules exist to prevent. The discount that feels like helping your own business is, in the regulator’s frame, the fund subsidising a related party.
The NALI Consequence, in Plain Terms
The tax outcome has a name: non-arm’s length income. Where income arises from a scheme in which the parties were not dealing at arm’s length and the fund derives more or less than an arm’s length outcome, that income can lose its concessional treatment entirely and be taxed at the top marginal rate instead. For a fund whose entire purpose is concessional tax on retirement savings, that is the worst available outcome: the rent the fund does receive gets taxed at the highest rate in the system.
The audit consequence runs alongside the tax one. Auditors routinely check related-party leases, and rent with no market evidence behind it invites the same escalation as an unsupported property value: queries, a qualified opinion, and a contravention report to the ATO.
The Evidence That Protects the Fund
The protection is straightforward: a market rent assessment supported by comparable leasing evidence, showing what similar premises in the area actually rent for and how the fund’s rent was set against them. It is the leasing twin of the comparable-sales standard that applies to the property value itself. With it, the arm’s length question has a documented answer before anyone asks. Without it, the rent is an assertion.
We prepare market rent assessments as a $125 + GST add-on to our commercial valuation reports, built on comparable leasing evidence and delivered in 1-4 business days. They are also available on their own. Just ask. Trustees with a related-party lease commonly order the valuation and the rent assessment together, so the value on the books and the rent through the books carry the same standard of evidence.
Frequently Asked Questions
Is it legal for my SMSF to lease property to a related party?
Business real property can be leased to a related party, which is why so many business owners hold their premises in their SMSF. The lease must be on arm's length terms, with rent at market rates and documented like any commercial tenancy. Residential property generally cannot be leased to related parties.
How is market rent evidenced for an SMSF lease?
With a market rent assessment supported by comparable leasing evidence: what similar premises in the area actually rent for, itemised so an auditor can check it. A figure asserted without comparables faces the same evidence problem as an unsupported valuation.
How often should the rent on a related-party lease be reviewed?
At every rent review or lease renewal, and whenever the local leasing market moves materially. Auditors look at whether the rent being paid still reflects the market, not just whether it did when the lease was signed.
What if the rent is above market instead of below?
Arm's length cuts both ways. Rent above market rates raises its own issues, including whether amounts flowing into the fund are really disguised contributions. The safe position is the same evidence: rent set to the market and documentation showing how.
Does a rental appraisal come with the commercial valuation?
It is a $125 + GST add-on to the commercial report, and it is also available on its own. Just ask. Many trustees with related-party leases order both together so the value and the rent carry the same evidentiary standard.
Holding commercial property with a related-party lease?
Order the commercial valuation with a market rent assessment and settle both questions in one report.
Last updated 4 August 2026. General information about valuation and rent evidence, not tax advice. NALI outcomes depend on your fund’s circumstances. Speak to your accountant or adviser.
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