When to Fix Your Investment Loan Rate

A fixed rate investment loan locks your interest rate for a set period, typically between one and five years.

That certainty appeals to property investors who want predictable repayments and protection from rate rises, but it comes with trade-offs that matter more for investment properties than owner-occupied homes. You cannot make extra repayments without penalty on most fixed rate products, and breaking the loan early can trigger break costs that run into thousands of dollars. For investors holding property in Brisbane's inner suburbs or growth corridors like The Gap, Kenmore, or Mitchelton, those restrictions can limit your ability to respond when circumstances change or when refinancing becomes worthwhile.

How Fixed Rate Investment Loans Differ From Variable Products

Fixed rate investment loans charge the same interest rate for the agreed term, regardless of what the Reserve Bank does. Variable rate products move up or down as lenders adjust their rates, which means your repayments can change every few months.

The difference shows up most clearly in what you can and cannot do during the loan term. Variable rate loans typically allow unlimited extra repayments, access to offset accounts, and the ability to refinance without penalty. Fixed rate loans generally do not. Most lenders cap additional repayments at around $10,000 to $30,000 per year on a fixed investment loan, and offset accounts are rarely available. If you want to sell the property, refinance to release equity, or pay down the loan faster than expected, you will likely face break costs.

In our experience, investors who fix their rate often do so to stabilise cash flow during the early years of ownership, particularly when rental income is tight or when they are carrying multiple properties. The predictability helps with budgeting, but it also removes flexibility at a time when portfolio strategy can shift quickly.

Interest Only Repayments and Why Investors Use Them

Most investors structure their loans on an interest only basis, at least for the first few years. This keeps repayments lower and maximises the tax deduction, because all of the interest paid on an investment loan is typically claimable as an expense.

You can set up a fixed rate investment loan as interest only, and many investors in Brisbane do exactly that. Consider an investor who purchases a two-bedroom unit in Paddington and fixes the rate at interest only for three years. The repayments stay the same each month, the entire repayment is deductible, and the investor avoids paying down the principal during a period when cash flow from the rental property might be marginal. After the fixed period ends, the loan can revert to principal and interest, or the investor can refinance and negotiate another interest only period if the property has increased in value and the loan to value ratio supports it.

Interest only repayments are not a long-term solution. The loan balance does not reduce, so you are relying entirely on capital growth to build equity. If the property does not appreciate as expected, or if rental income falls short due to higher vacancy rates, you can find yourself with limited options when the interest only period expires.

Fixed Rate Break Costs and How the Calculation Works

Break costs apply when you exit a fixed rate loan before the agreed term ends. The lender calculates the cost based on the difference between your fixed rate and the wholesale rate the lender can now earn by lending that money elsewhere.

If rates have fallen since you fixed, the lender loses income, and you pay the difference. If rates have risen, there is usually no break cost, because the lender can now lend the money at a higher rate than you were paying. The calculation is not transparent, and the figure can be significant. We regularly see break costs of $5,000 to $15,000 on investment loans where the fixed period still has two or three years to run and rates have dropped in the meantime.

This becomes relevant when you want to sell, when a better refinancing opportunity arises, or when you need to access equity for another purchase. Investors who locked in fixed rates before recent rate changes have faced difficult decisions: pay the break cost and refinance to a lower rate, or hold the existing loan and miss the saving. The answer depends on how long you plan to hold the property and whether the long-term saving outweighs the upfront cost.

Tax Treatment and Deductibility for Fixed Rate Investment Loans

Interest paid on an investment loan is deductible against your rental income, and this applies whether the loan is fixed or variable. The Australian Tax Office allows you to claim the interest as an expense in the year it is incurred, which reduces your taxable income and lowers the after-tax cost of holding the property.

If you incur break costs when exiting a fixed rate investment loan, those costs are also deductible, but they must be claimed over the remaining term of the loan or five years, whichever is shorter. You cannot claim the full amount in the year you pay it. Other costs associated with setting up or refinancing the loan, such as valuation fees, application fees, and legal costs, are also deductible, either immediately or spread over the life of the loan depending on the nature of the expense.

For Brisbane investors building a portfolio, understanding what is and is not claimable makes a tangible difference to cash flow. Even small deductions add up when you are carrying multiple properties, and knowing how to structure the loan and the expenses around it can shift a marginally negative property into a more sustainable position.

When Fixing Your Investment Loan Rate Makes Sense

Locking in a fixed rate makes sense when you need certainty more than you need flexibility. This usually happens in three situations: when you are holding multiple properties and want to reduce the risk of rate rises affecting your serviceability, when rental income is tight and you cannot absorb higher repayments, or when you believe rates are likely to rise and you want to protect your cash flow.

Consider an investor who owns a house in Ashgrove and is about to settle on a second property in Bardon. The rental income from both properties covers most of the repayments, but not all of them. Fixing the rate on one or both loans for three years provides breathing room. The investor knows exactly what the repayments will be, and that certainty makes it possible to plan around other commitments without constantly adjusting for rate changes.

The alternative is to stay variable and keep the flexibility to make extra repayments, refinance when needed, or access an offset account to reduce the interest charged. That approach works well when your financial position is strong, when you expect to sell or refinance within a few years, or when you want to pay down the loan faster than the minimum term.

How the 2026 Federal Budget Changes Investment Property Strategy

From 1 July 2027, new tax rules apply to residential investment properties purchased after 12 May 2026. If you bought an established property after that date, you will no longer be able to claim rental losses against your salary or other income. Those losses can still be carried forward and claimed against future rental income or capital gains, but the immediate tax benefit disappears.

Capital gains tax treatment also changes. The 50% discount is replaced with an inflation-based discount and a minimum 30% tax on gains for properties purchased after Budget night. New builds remain exempt from these changes, and investors buying new construction can still access the full 50% CGT discount and negative gearing as it currently exists.

For investors in Brisbane who are considering a fixed rate loan, these changes affect the financial case for holding the property. If rental losses cannot be claimed immediately, the after-tax cost of holding the property increases, and the margin for error tightens. Fixing the rate provides some protection against rate rises, but it does not change the underlying tax position. Investors need to model their cash flow carefully and factor in the new rules before committing to a long-term fixed rate.

Split Rate Strategies and How They Work for Investment Loans

You do not have to fix the entire loan. Splitting the loan between fixed and variable gives you some certainty while keeping access to the features that matter for investors.

A common approach is to fix 50% to 70% of the loan and leave the rest variable. The fixed portion stabilises your repayments, and the variable portion allows you to make extra payments, use an offset account, or refinance part of the loan without triggering break costs. This works particularly well when you are not sure how long you will hold the property or when you want to retain the option to access equity for another purchase.

In a scenario like this, an investor with a $600,000 loan might fix $400,000 for three years and leave $200,000 variable. The fixed portion provides a floor for repayments, and the variable portion absorbs any extra cash flow or offset balance. If the investor decides to sell or refinance within the fixed period, only the fixed portion attracts break costs, and the variable portion can be repaid or refinanced without penalty.

Application Process and What Lenders Look For

Applying for a fixed rate investment loan follows the same process as any other investment loan application. The lender assesses your income, your existing debts, the rental income from the property, and your ability to service the loan if interest rates rise or if the property sits vacant.

Most lenders apply a serviceability buffer, which means they test your ability to repay the loan at a rate 2% to 3% higher than the actual rate you will pay. They also apply a vacancy rate assumption, typically around 5%, which reduces the rental income they count toward your serviceability. If you are buying in a Brisbane suburb with low vacancy rates and strong rental demand, the lender still applies the buffer, so the rental income alone rarely covers the full repayment in their calculation.

Lenders also look at your loan to value ratio. If you are borrowing more than 80% of the property's value, you will pay Lenders Mortgage Insurance, which adds to the upfront cost. Keeping your deposit above 20% avoids that cost and improves your chances of securing a lower rate, whether you fix or go variable. If you are using equity from another property to fund the deposit, the lender will value both properties and calculate the combined LVR across your portfolio.

Call one of our team or book an appointment at a time that works for you to talk through your circumstances and work out whether fixing part or all of your investment loan makes sense for where you are now and where you want to be in a few years.

Frequently Asked Questions