Everything You Need to Know About Fixed Investment Loans

Why Fixed Rate Investment Loans Limit Extra Repayments

Fixed rate investment loans typically restrict or prohibit additional repayments beyond the scheduled amount. Lenders price fixed rate products by locking in wholesale funding costs for the fixed period, and when borrowers repay early, the lender loses the expected interest margin and may incur break costs from its own funding arrangements.

Most lenders allow between $10,000 and $30,000 in extra repayments per year on a fixed investment loan without penalty, though some products allow none at all. Any amount beyond that annual cap attracts a break cost, calculated as the economic loss to the lender from the early repayment. The break cost formula compares the interest rate on your loan with the rate the lender can now earn by reinvesting your repayment over the remaining fixed term. When variable rates sit below fixed rates, break costs can run into tens of thousands of dollars on even moderate loan amounts.

Consider an investor who refinanced a $600,000 investment loan on a five-year fixed rate before rates began to fall. Eighteen months into that term, rental income improved and the investor wanted to reduce the loan by $80,000. The loan product allowed $20,000 per year in extra repayments, meaning $60,000 would exceed the cap. With three and a half years remaining on the fixed term and a two percentage point margin between the fixed rate and the current wholesale rate, the break cost came to approximately $42,000. The investor chose instead to place the surplus funds in an offset account linked to a separate variable rate loan, preserving access to the capital while still reducing total interest.

How Legislative Changes Affect Investment Loan Strategy

From 1 July 2027, net rental losses from residential investment properties acquired after 7:30pm AEST on 12 May 2026 can only be offset against other residential rental income, not against salary or wages. This removes one of the primary tax advantages that made negatively geared investments attractive to buyers in Canterbury and across Melbourne's middle-ring suburbs.

Properties purchased before that date remain grandfathered under the existing negative gearing rules until sold. For investors holding multiple properties, this creates a split portfolio where older properties retain full deductibility of interest and holding costs against wage income, while newer acquisitions do not. In practical terms, a Canterbury investor earning $120,000 per year with a rental loss of $15,000 on an older property can still offset that loss and reduce taxable income to $105,000. If the same investor purchases a second property after the cutoff and incurs a $12,000 annual loss, that loss is quarantined and can only be used to offset future rental profit or capital gains on residential property.

Fixed rate loans remove some flexibility, but they also lock in the interest expense for the fixed period. Where an investor expects rental income to remain below holding costs for several years, a fixed rate provides certainty around the size of the quarantined loss. Variable rates may fall further, reducing the ongoing loss, but they may also rise and increase it. The quarantined loss carries forward indefinitely and offsets future gains, so the absolute size of the loss still matters even though it cannot be used against wage income.

Fixed Versus Variable for Canterbury Property Investors

Canterbury's median house price and proximity to the Camberwell Junction and Canterbury Road retail precincts make it a consistent performer for investors seeking long-term capital growth and stable rental demand. The suburb's mix of period homes, updated weatherboard cottages and newer townhouses attracts professionals and families, supporting relatively low vacancy rates even in softer rental markets.

Variable rate investment loans allow unlimited extra repayments without penalty and offer access to offset accounts, which can be particularly useful where rental income fluctuates or the investor holds surplus cash intermittently. Offset account balances reduce the interest charged each day without reducing the loan balance itself, preserving the size of the deductible debt while lowering the cost of servicing it. Under the new quarantining rules, this distinction becomes less relevant for post-May 2026 purchases because the interest saved does not reduce a tax deduction that can be used against wage income, but it still improves cash flow and builds equity faster.

Fixed rate products offer protection against rising interest rates but generally do not include offset accounts. Where a fixed rate investment loan does offer an offset facility, the interest rate is usually higher than an equivalent fixed loan without offset, and the benefit of the offset is capped or calculated differently. For a Canterbury investor with irregular income or cash reserves, the loss of offset functionality may outweigh the benefit of rate certainty, particularly if the fixed period extends beyond five years and restricts future refinancing opportunities.

Split Rate Loans and When They Suit Investors

A split rate loan divides the total loan amount into two or more portions, each with its own interest rate type. One portion might be fixed for three or five years, providing certainty over a portion of the repayment, while the remainder sits on a variable rate with full redraw and offset access.

This structure suits investors who want some protection against rate rises but also need the flexibility to make extra repayments or use offset funds to manage cash flow. In a scenario where an investor borrows $700,000 to purchase a renovated Edwardian home in Canterbury, splitting $400,000 onto a fixed rate and $300,000 onto a variable rate with offset allows the investor to lock in roughly 57 per cent of the interest cost while retaining full flexibility over the remainder. If rental income exceeds expectations or the investor receives a bonus, extra repayments can be directed to the variable portion or parked in the offset account without triggering break costs.

The disadvantage of a split loan is administrative. Each portion may have a separate account number, separate monthly statements, and separate annual fees. Some lenders charge an additional fee to establish or maintain a split structure. Where the investor later wants to refinance the investment loan, both portions must either be refinanced together or one portion closed and the other retained, which can complicate the application and valuation process.

Interest-Only Versus Principal and Interest Repayments

Interest-only investment loans allow the borrower to pay only the interest component for a set period, typically one to five years, without reducing the principal. This lowers the monthly repayment and can improve cash flow where rental income does not cover the full cost of a principal and interest repayment.

Interest-only loans remain available on both fixed and variable rates, though lenders apply stricter serviceability assessments and may require a lower loan-to-value ratio. From a tax perspective, interest-only repayments maximise the deductible interest expense in the early years of ownership, which may be useful where the investor has high wage income and can still offset the rental loss under the grandfathered rules. For properties acquired after May 2026, the value of maximising deductible interest is reduced because the loss cannot be offset against wages, though it still increases the carried-forward loss available to offset future residential rental income or capital gains.

Fixed rate interest-only loans allow extra repayments within the annual cap, but those repayments reduce the principal and therefore reduce the deductible debt. For an investor prioritising tax efficiency over debt reduction, making extra repayments on an interest-only investment loan can be counterproductive. A more effective approach is to direct surplus cash toward an offset account on a separate owner-occupier loan or into another investment that produces assessable income, allowing the rental loss on the interest-only loan to be maximised and carried forward.

Capital Gains Tax and the Shift to Indexation

From 1 July 2027, the 50 per cent capital gains tax discount is replaced with cost base indexation and a 30 per cent minimum tax rate on real gains. For investment properties held before that date, gains accruing up to 30 June 2027 are taxed under the existing 50 per cent discount rules, and gains accruing after that date are taxed under the indexed cost base method.

The change affects hold periods and the calculus around selling versus holding. Under the discount method, an investor in Canterbury who purchased for $1,000,000 and sold for $1,400,000 after holding for more than twelve months would pay CGT on 50 per cent of the $400,000 gain, or $200,000, at their marginal tax rate. Under the indexed cost base method, the $1,000,000 purchase price is adjusted for inflation over the holding period, reducing the taxable gain. If CPI increased by 15 per cent over that period, the indexed cost base becomes $1,150,000, and the real gain is $250,000. That $250,000 is taxed at a minimum of 30 per cent, or $75,000, regardless of the investor's marginal rate.

For properties acquired before 1 July 2027 and sold after, a valuation as at 1 July 2027 allows the investor to split the gain and apply the more favourable tax treatment to the pre-July 2027 portion. This may make it worthwhile to obtain a valuation even where there is no immediate intention to sell, particularly for investors in Canterbury where property values have appreciated steadily over the past decade. Lenders generally do not require a valuation simply for tax planning, so the cost falls to the investor, but the expense may be deductible as a cost related to managing the investment.

How APRA's Debt-to-Income Cap Affects Borrowing Capacity

From 1 February 2026, each lender may fund no more than 20 per cent of new investment loans at a debt-to-income ratio of six times or greater. The cap applies to new lending only and does not affect existing loans, but it directly limits how much an investor can borrow if their total debt already sits at or above six times their gross income.

For a Canterbury investor earning $140,000 per year, a debt-to-income ratio of six equates to total borrowing of $840,000 across all residential loans. If the investor already holds an owner-occupier loan of $500,000 and wants to borrow $400,000 for an investment property, the combined debt of $900,000 exceeds the six times threshold. The application would fall into the 20 per cent bucket, and if the lender has already allocated its quota for that month or quarter, the application may be declined or deferred regardless of the investor's income, deposit, or serviceability at the assessed rate.

The cap does not apply to finance for newly constructed dwellings, which provides an alternative pathway for investors who can service a larger loan but are caught by the DTI limit. Purchasing a newly completed townhouse or apartment in Canterbury rather than an established home allows the investor to access finance outside the 20 per cent cap, though the pool of new stock in the suburb is limited given the established character of the area.

Structuring Extra Repayments on a Split Loan

Where an investor holds a split loan with one portion fixed and one portion variable, extra repayments should generally be directed to the variable portion to avoid break costs. Most lenders allow the borrower to specify which loan account receives additional funds, either through online banking or by instruction to the lender.

The exception is where the investor intends to convert the property from an investment to an owner-occupied residence in future, or vice versa. Interest on borrowings is only deductible to the extent the funds are used to acquire or hold an income-producing asset. If an investor makes extra repayments on the variable portion of a split investment loan and later refinances to access that equity for private purposes, the redrawn amount is not deductible even though the original loan was. To preserve deductibility, the investor should avoid making extra repayments on the investment loan and instead direct surplus funds to a separate loan or offset account that is not linked to the investment property.

This becomes more complex where the investor holds multiple properties or plans to build a portfolio. Keeping each investment loan separate, avoiding cross-collateralisation, and ensuring extra repayments or redraws are clearly linked to the purpose of the funds is critical for maintaining the integrity of the tax deduction. A mortgage broker in Canterbury can assist with structuring loans to preserve flexibility and deductibility as the portfolio grows.

Whether you are purchasing your first investment property in Canterbury or restructuring an existing portfolio ahead of the July 2027 changes, the choice between fixed and variable rates, the use of extra repayments, and the way you structure your borrowing all have long-term consequences for cash flow, tax, and capital growth. Call one of our team or book an appointment at a time that works for you.

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