The Easiest Way to Lock in Fixed Rate Investment Loans

The Easiest Way to Lock in Fixed Rate Investment Loans

Fixed rate investment loans give you certainty over your borrowing costs for a set period, typically between one and five years. For investors in Glenelg, where rental demand remains solid from both professionals working in the Adelaide CBD and holidaymakers drawn to the beachside lifestyle, locking in repayments can align your cashflow with your broader property investment strategy. The decision to fix part or all of an investment loan depends on where you are in your wealth-building journey, how you plan to use rental income, and whether you need flexibility to make extra repayments or access equity as your portfolio grows.

What Fixed Rate Features Mean for Investment Property Finance

A fixed rate investment loan holds your interest rate steady for the agreed term, regardless of what happens to variable rates during that period. Your repayments stay the same, which makes budgeting more predictable when you're balancing rental income against holding costs like council rates, insurance, and body corporate fees.

Consider an investor who owns a two-bedroom apartment near Jetty Road and plans to hold the property for at least a decade. Rental income covers most of the mortgage, but the investor works part-time and values the certainty of knowing exactly what the loan repayment will be each month. Fixing the rate for three years means that even if the Reserve Bank moves rates up or down, the investor's cashflow remains stable. That stability can be particularly valuable if you're managing multiple properties or if your personal income fluctuates.

The trade-off is that fixed rate products generally limit how much extra you can repay each year without incurring break costs. Most lenders allow between $10,000 and $30,000 in additional repayments annually during a fixed period. If you think you'll have surplus rental income or want to pay down the loan aggressively, that restriction may not suit your approach.

How Fixed Rate Investment Loans Interact with Negative Gearing

Interest on borrowings used to acquire or hold residential rental property is deductible against assessable income to the extent the property is rented or held to produce assessable income. Whether you choose a fixed or variable rate, the interest you pay on an investment loan remains a claimable expense.

For properties held at 12 May 2026, losses from residential investment properties continue to be fully deductible against other income, including salary and wages, until the property is sold. From the 2027-28 income year, losses related to established residential investment properties acquired after that date are deductible only against other income from residential properties, including capital gains on residential properties. If you purchased your Glenelg investment before that cut-off, the interest on a fixed rate loan continues to reduce your taxable income in the same way it always has. For properties acquired more recently, the interest is still deductible, but only against rental income or future property gains rather than your salary.

The structure of the loan itself does not change the tax treatment, but the certainty of a fixed rate can help you project your tax position more accurately over the fixed term. If you know your interest expense will be a set amount each month, you can estimate your end-of-year deductions with more confidence.

Interest-Only Repayments and Fixed Rate Structures

Interest-only investment loans allow you to pay only the interest portion of the loan for a set period, typically up to five years, which reduces your monthly repayment compared to principal and interest. Many investors combine an interest-only structure with a fixed rate to maximise cashflow and certainty during the holding period.

In a scenario where an investor purchases a villa unit in the southern end of Glenelg with a loan amount just under the suburb's median property value, choosing interest-only repayments on a three-year fixed rate means the monthly outgoing is lower and predictable. That frees up cashflow to cover other costs or to save toward a deposit on a second property. The investor is not reducing the loan balance during the interest-only period, but the strategy prioritises building a portfolio over paying down individual loans.

Under APS 112, a long-term interest-only residential loan is classified as non-standard where the LVR is greater than 80 per cent and the contractual interest-only period is greater than five years or is not specified. For most investors, interest-only periods are capped at five years, and lenders apply stricter serviceability assessments to interest-only applications. If you're planning to hold the property long-term and eventually switch to principal and interest, make sure the loan structure allows that transition without requiring a full refinance.

When the fixed and interest-only periods end, the loan typically reverts to a variable rate and principal-and-interest repayments. That can result in a sudden increase in your monthly outgoing, so it's worth reviewing your refinancing options at least six months before the fixed term expires.

Split Rate Strategies for Portfolio Investors

A split rate loan divides your total loan amount into two or more portions, with each portion on a different rate type. You might fix half the loan for three years and leave the other half on a variable rate. The fixed portion gives you certainty, while the variable portion retains flexibility for extra repayments and access to features like offset accounts.

For investors managing properties in Glenelg and other suburbs, a split structure can balance competing priorities. The fixed portion protects you if rates rise, and the variable portion lets you take advantage of any rate cuts or make lump-sum repayments without penalty. If you receive a bonus, tax refund, or surplus rental income, you can direct those funds to the variable portion and reduce the loan balance faster.

Split loans also give you the option to stagger fixed rate expiry dates. If you fix one portion for two years and another for four years, you avoid the risk of your entire loan reverting to a variable rate on the same day. That spreads your exposure and gives you more control over when and how you refinance each portion.

Serviceability and Borrowing Capacity with Fixed Rates

APRA requires all ADIs to assess new borrowers' capacity to service a home loan, including a residential investment loan, at an interest rate that is at least 3.0 percentage points above the loan product rate. APRA activated a DTI lending limit on 27 November 2025, effective from 1 February 2026, with each ADI able to lend up to 20 per cent of new investor loans to borrowers with a total DTI ratio of six times or greater.

When you apply for a fixed rate investment loan, the lender assesses your ability to service the loan at a much higher rate than you'll actually pay. That buffer protects both you and the lender if rates increase sharply. The assessment also considers your existing debts, living expenses, and any other investment properties you hold. If you're planning to grow your portfolio, the way the lender calculates rental income and applies discounts to that income can significantly affect how much you can borrow for your next property.

Fixed rates do not change the serviceability calculation, but they can affect how lenders view your application. Some lenders treat fixed rate loans more conservatively when assessing your capacity to take on additional debt, particularly if the fixed period is long and your cashflow is tight. If you're planning to buy another investment property within the next year or two, discuss with your broker whether a shorter fixed term or a split structure might leave you with more borrowing capacity when you're ready to expand.

When Fixed Rates May Not Suit Your Investment Strategy

Fixed rate products generally limit how much extra you can repay each year without incurring break costs, typically between $10,000 and $30,000 in additional repayments annually. If you expect to sell the property, refinance to access equity, or make large lump-sum repayments during the fixed period, those restrictions can become costly.

Break costs apply when you exit a fixed rate loan early, and the calculation depends on the difference between your fixed rate and the lender's current cost of funds. If rates have fallen since you fixed, the lender may charge you thousands of dollars to compensate for the loss they incur by breaking the contract. If rates have risen, break costs are usually zero or minimal.

For investors who plan to leverage equity to fund their next purchase, a fixed rate loan can delay that strategy unless the loan allows partial redraws or splits. If you're likely to need access to equity within the fixed term, a variable rate or a split structure may serve you with more flexibility. The same applies if you're holding a property in a high-growth area like Glenelg and expect to see significant capital growth within a short timeframe. Being locked into a fixed rate can limit your ability to act quickly when opportunities arise.

How to Choose the Right Fixed Term for Your Investment Loan

The decision to fix part or all of an investment loan depends on where you are in your wealth-building journey, how you plan to use rental income, and whether you need flexibility to make extra repayments or access equity as your portfolio grows. A three-year fixed term is common because it balances rate certainty with a reasonable time horizon. Fixing for one or two years can be useful if you expect rates to fall in the near term, while a five-year term suits investors who want maximum stability and are confident they won't need to change the loan structure during that period.

If you're holding a property in a location with strong rental demand, such as the beachside precincts of Glenelg where vacancy rates are typically low, the predictability of a fixed rate can support a longer-term hold strategy. You know exactly what your interest cost will be, and you can plan around that figure when budgeting for other investments or life events.

Before committing to a fixed term, review your overall financial position. Consider whether you're likely to receive an inheritance, sell another asset, or change jobs during the fixed period. Any of those events might prompt you to repay the loan early or restructure your debt, and the cost of doing so under a fixed rate can outweigh the benefit of rate certainty.

Call one of our team or book an appointment at a time that works for you. We'll review your current investment loan structure, your plans for portfolio growth, and whether a fixed rate, variable rate, or split loan aligns with where you're heading. For investors in Glenelg managing rental properties alongside other commitments, having a loan structure that fits your life as it is now, and as it's likely to be in a few years, makes a tangible difference to both your cashflow and your capacity to keep building wealth through property.

Frequently Asked Questions