How Repayment Structure Affects Your SMSF Loan
The choice between interest-only and principal-and-interest repayments for an SMSF property loan determines how much cash the fund must commit each month, how quickly equity builds in the property, and what proportion of the fund's income is absorbed by loan servicing. Interest-only repayments require the fund to pay only the cost of borrowing each period, leaving the principal balance unchanged until the interest-only term expires or the loan is refinanced. Principal-and-interest repayments include both the interest charge and a portion of the loan balance, progressively reducing the amount owed.
Consider a self-managed super fund acquiring a commercial property in Toowoomba for $600,000 with a 70 percent loan-to-value ratio. The fund borrows $420,000 under a limited recourse borrowing arrangement. At current variable rates, an interest-only repayment might be approximately $2,700 per month, while a principal-and-interest repayment on a 15-year term could be approximately $3,800 per month. The difference of $1,100 per month must be funded from rental income, member contributions, or the fund's existing cash reserves.
The interest-only structure reduces immediate cash pressure and can suit funds with limited liquidity or where members are still accumulating balances and making regular contributions. The principal-and-interest structure accelerates equity growth and reduces total interest cost over the life of the loan, which may suit funds with strong rental income or where members are approaching retirement and intend to transition the property into pension phase.
Interest-Only Terms for SMSF Property Loans
Most lenders offering SMSF loans allow interest-only terms of up to five years for both residential and commercial property, after which the loan reverts to principal-and-interest repayments unless refinanced. The interest-only period is not automatically renewable. The fund must demonstrate it can service the higher principal-and-interest repayments once the interest-only term expires, even if it does not intend to retain the loan to that point.
Some lenders apply stricter criteria for interest-only SMSF loans, including lower loan-to-value ratios or higher interest rate margins compared to principal-and-interest loans. This reflects the lender's view that the fund is not reducing its exposure during the interest-only period. Refinancing at the end of the interest-only term may be necessary if the fund cannot service principal-and-interest repayments from income alone, but the fund's circumstances, the property's value, and the lender's appetite for SMSF lending at that time will all affect whether refinancing is approved.
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Cash Flow and Contribution Planning
An SMSF must service its loan obligations from rental income, investment returns, or member contributions. Interest-only repayments allow more of the fund's income to remain available for other investments, insurance premiums, accounting fees, and other operational costs. Where rental income is insufficient to cover the interest-only repayment, members may need to make additional concessional or non-concessional contributions to meet the shortfall.
Concessional contributions are capped at $32,500 per member per annum from 1 July 2026. Non-concessional contributions are capped at $130,000 per member per annum, with bring-forward arrangements available depending on the member's total superannuation balance. A fund relying on member contributions to service a principal-and-interest loan must account for these caps and the risk that a member's employment or income circumstances change, affecting their capacity to contribute.
An SMSF cannot borrow to meet loan repayments or operating expenses. Where the fund cannot service the loan from its own resources, it risks default. The lender's recourse is limited to the property held under the limited recourse borrowing arrangement, but default still results in the loss of that asset and may affect the fund's compliance status.
Equity Growth and Division 296 Tax
Principal-and-interest repayments reduce the loan balance and increase the fund's equity in the property. Interest-only repayments do not. Equity growth does not by itself produce a tax benefit during the accumulation phase, but it improves the fund's net asset position and may allow the fund to access lower interest rates or higher loan-to-value ratios when refinancing.
From 1 July 2026, Division 296 tax applies to members with a total superannuation balance above $3 million at the end of the financial year. Division 296 fund earnings include realised capital gains and rental income but do not include unrealised increases in property value. The loan amount under a limited recourse borrowing arrangement is disregarded when calculating a member's total superannuation balance. A member with a $600,000 property and a $420,000 SMSF loan has a total superannuation balance that includes the full $600,000 value of the property, but the $420,000 loan is not deducted for Division 296 purposes. Reducing the loan balance through principal-and-interest repayments does not reduce the member's total superannuation balance for Division 296 purposes, but it does increase the fund's net equity.
Tax Deductibility and Fund Returns
Interest paid on an SMSF loan is a tax-deductible expense where the borrowed funds are used to acquire an income-producing asset. The deduction applies whether the loan is interest-only or principal-and-interest. The principal component of a principal-and-interest repayment is not deductible. It represents a reduction in the loan balance, not an expense incurred in earning assessable income.
A complying SMSF in accumulation phase is taxed at 15 percent on its assessable income. Rental income after allowable deductions, including interest, is included in assessable income. A property generating $30,000 in annual rent with $25,000 in interest and other deductible expenses produces $5,000 in assessable income, taxed at $750. If the loan is structured as principal-and-interest and the fund pays an additional $13,000 per year in principal repayments, that $13,000 is not deductible and does not reduce the fund's assessable income. The after-tax return on the property must account for both the tax payable on net rental income and the cash committed to principal reduction.
Toowoomba Commercial Property and Sole Purpose Test
SMSF loans for commercial property in Toowoomba remain available under the limited recourse borrowing arrangement framework following the restriction on new residential LRBAs that commenced in August 2026. Business real property under section 66 of the Superannuation Industry (Supervision) Act 1993 includes land and buildings used wholly and exclusively in one or more businesses. Toowoomba's commercial property market includes industrial facilities near the Toowoomba Wellcamp Airport precinct, retail premises in the CBD, and medical consulting rooms near Toowoomba Base Hospital.
The repayment structure for a commercial SMSF loan follows the same principles as for residential loans entered before the restriction. Rental yields on commercial property in regional centres such as Toowoomba are often higher than residential yields, which improves the fund's capacity to service principal-and-interest repayments from rental income alone. Lease terms for commercial tenants are typically longer than residential leases, and outgoings are often recovered from the tenant, reducing the fund's exposure to variable operating costs.
The sole purpose test requires that the fund is maintained for the sole purpose of providing retirement benefits to members. A commercial property leased to a related party of a member must be leased on arm's length terms at market rent. The property cannot be used by the member or a related party for private purposes. A member operating a business cannot lease premises from their SMSF at below-market rent to reduce business costs, as this would breach the sole purpose test and the arm's length income rules.
Refinancing SMSF Loans After the 2026 Changes
Existing residential SMSF loans entered before the commencement of the restriction on new residential LRBAs may be refinanced without being treated as a new arrangement, provided the refinancing maintains the limited recourse character of the original arrangement and relates to the same single acquirable asset. The Australian Taxation Office had not published updated guidance on the circumstances in which a refinancing arrangement might be treated as a new LRBA under the post-commencement rules as at July 2026.
Refinancing from interest-only to principal-and-interest, or from one lender to another, does not by itself end the original arrangement. A change to the ultimate beneficiaries of the arrangement, the addition of a new asset under the same loan, or a significant change to the terms inconsistent with the original arrangement may end the existing arrangement and create a new one. Trustees considering refinancing an existing residential SMSF loan should obtain specialist legal advice before proceeding.
Commercial SMSF loan refinancing is not affected by the 2026 restriction. A fund holding a commercial property under an LRBA may refinance to access lower interest rates, switch from interest-only to principal-and-interest, or extend the loan term, provided the refinanced loan relates to the same asset and maintains the limited recourse character.
Loan Serviceability and Fund Strategy
Lenders assess an SMSF's capacity to service a loan based on the rental income from the property being acquired, the fund's existing income from other investments, and the age and contribution capacity of the members. Most lenders apply a rental income buffer, requiring that rental income alone covers at least 120 percent to 140 percent of the interest-only repayment. Principal-and-interest serviceability is assessed on the full repayment amount, which reduces the maximum loan amount the fund can obtain for a given level of rental income.
A Toowoomba-based SMSF purchasing an industrial property with annual rent of $45,000 may be assessed as having rental income of approximately $38,000 after applying a vacancy and expense buffer. At a serviceability rate of 8.5 percent, the fund could service interest-only repayments on a loan of approximately $450,000. The same rental income would support a lower loan amount if assessed on principal-and-interest repayments. The fund's trustees must determine whether the reduced borrowing capacity under a principal-and-interest structure is acceptable or whether the interest-only structure allows the fund to acquire a larger or higher-yielding asset.
The trustees must also consider the fund's capacity to meet the higher principal-and-interest repayments when the interest-only term expires. Where members are approaching retirement and contribution capacity is declining, the fund may need to sell the property, refinance to another interest-only term, or transition the property into pension phase before the loan term ends.
Call one of our team or book an appointment at a time that works for you to discuss how repayment structure, contribution planning, and the 2026 legislative changes affect your SMSF loan strategy.
Frequently Asked Questions
Can an SMSF loan be interest-only for the full loan term?
Most lenders allow interest-only terms of up to five years, after which the loan reverts to principal-and-interest repayments unless refinanced. The fund must demonstrate it can service principal-and-interest repayments even if it does not intend to retain the loan beyond the interest-only period.
Does paying principal reduce Division 296 tax liability?
Reducing the loan balance through principal repayments increases the fund's net equity but does not reduce the member's total superannuation balance for Division 296 purposes. The full property value is included in the total superannuation balance, and the loan amount is disregarded.
Are SMSF loans for commercial property still available after the 2026 changes?
Yes. The restriction that commenced in August 2026 applies only to new limited recourse borrowing arrangements involving residential property. Commercial property that satisfies the business real property definition under section 66 of the SIS Act can still be acquired using an LRBA.
Can an SMSF refinance from interest-only to principal-and-interest?
Yes. Refinancing from interest-only to principal-and-interest does not by itself end the original arrangement, provided the refinanced loan relates to the same asset and maintains the limited recourse character. Trustees should obtain specialist advice before refinancing an existing residential LRBA.
Is the principal portion of an SMSF loan repayment tax deductible?
No. Only the interest component is tax deductible. The principal repayment reduces the loan balance but is not an expense incurred in earning assessable income and therefore does not produce a tax deduction.
