The Pros and Cons of Fixed Rate Investment Loans

Understanding how fixed rate features work for investment properties and what matters most when choosing rate certainty for your rental property loan.

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

That means your repayments stay the same regardless of what happens with the Reserve Bank's cash rate. For property investors in Algester, where many are holding newer units or townhouses as rentals while building equity, knowing exactly what your loan costs each month makes budgeting much more predictable. But fixed rates also come with conditions that limit how you can use the loan while the rate is locked.

Fixed Rate Certainty and What It Actually Protects

A fixed rate protects you from rate rises during the fixed period. If you lock in a rate and the Reserve Bank increases the cash rate multiple times after that, your repayments don't change. That certainty can be valuable if you're holding a property through a period where rental income might be patchy or if you've borrowed close to your limit and can't afford repayment increases.

Consider an investor who bought a two-bedroom unit in Algester, close to the Algester Road precinct, with a 20% deposit. They fixed their rate for three years at a point when rates were expected to climb. Over the next 18 months, the cash rate increased four times. Their repayments stayed the same while variable rate borrowers saw their monthly costs rise by several hundred dollars. That stability meant they could hold the property through a brief vacancy period without needing to dip into reserves or refinance under pressure.

The downside is that if rates fall during your fixed period, you don't benefit. You're committed to the rate you locked in, even if it becomes higher than current variable rates. That's the trade you make for certainty.

What You Give Up When You Fix Your Rate

Fixed rate investment loans typically come with restrictions that limit your flexibility. Most lenders cap extra repayments at around $10,000 to $30,000 per year during the fixed period. If you want to pay down more than that, you'll face break costs. You also can't redraw extra payments you've made, and most fixed rate loans don't come with an offset account.

For investors, this matters more than it does for owner-occupiers. If you're planning to use equity from your investment property to fund another purchase, or if you want the option to pay down the loan quickly when you have surplus cash, a fixed rate can box you in. When exploring investment loan options, understanding these restrictions upfront helps you match the loan structure to your actual plans, not just to the rate on offer.

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Break Costs and Why They Exist

If you exit a fixed rate loan early, either by refinancing, selling the property, or paying out the loan in full, you may be charged break costs. These costs compensate the lender for the difference between the rate you locked in and the rate they can now lend that money at. If rates have fallen since you fixed, break costs can be substantial. If rates have risen, break costs are usually minimal or zero.

Break costs are calculated using a formula set by the lender, and they're not always easy to predict. Some lenders publish calculators, but the final figure depends on wholesale funding rates at the time you break the loan. If you think there's a chance you'll sell or refinance before the fixed period ends, this is a genuine risk to account for.

Interest Only Repayments on Fixed Rate Investment Loans

Many investors choose interest only repayments to keep monthly costs lower and maximise cash flow. Most lenders will allow you to fix an investment loan on an interest only basis, but the interest only period and the fixed rate period don't always align. You might fix your rate for three years but only have interest only approved for five years total. When the interest only period ends, your loan switches to principal and interest repayments, which increases your monthly cost even if your rate is still fixed.

This mismatch can catch investors off guard. If you're planning to hold a property in Algester, where median rents have been stable but not growing rapidly, make sure you understand when your repayments will increase and whether your rental income will cover the difference. Investment property finance structures need to account for both rate certainty and repayment type across the life of the loan.

Fixed Rate Loans and Negative Gearing Under the New Rules

Recent changes to negative gearing mean that if you bought an established property in Algester after 12 May 2026, you won't be able to claim net rental losses against your other income from 1 July 2027 onwards. Those losses can only be offset against future rental income or capital gains from residential property. If you're fixing your rate now, you're locking in your repayments during a period when your ability to claim tax deductions may be more limited than it was in the past.

This doesn't make fixed rates a bad choice, but it does mean you need to model your cash flow without assuming the same tax offset you might have received under the old rules. If your fixed repayments are higher than your rental income and you can't claim the shortfall against your salary, you need enough reserves to cover that gap for the duration of the fixed period.

Split Rate Loans as a Middle Option

A split rate loan lets you fix part of your loan and leave the rest on a variable rate. This gives you some protection from rate rises while keeping access to features like extra repayments and offset accounts on the variable portion. It's a common structure for investors who want certainty without losing all their flexibility.

You might fix 50% of your loan for three years and leave the other 50% variable. If rates rise, half your loan is protected. If rates fall, half your loan benefits. You can make extra repayments or redraw funds against the variable portion without triggering break costs. When considering an investment loan refinance, a split structure can also make it easier to adjust your loan as your strategy changes, since you're only breaking part of the fixed amount.

When Fixed Rates Make Sense for Algester Investors

Fixed rates suit investors who value certainty over flexibility, particularly if you're holding a property for the long term and don't plan to access equity or make large lump sum payments. They also make sense if you're borrowing at a high loan to value ratio and can't afford repayment increases, or if you're purchasing during a period when rates are low and expected to rise.

Algester has a mix of older standalone homes and newer medium-density developments, and the area tends to attract long-term renters, including families and young professionals working in nearby industrial precincts or commuting to the CBD. If you're holding a property here with stable rental income and no immediate plans to sell or refinance, a fixed rate can lock in your costs and let you focus on the hold strategy without worrying about rate movements.

If you're planning to build a portfolio, access equity regularly, or sell within a few years, a variable rate or split structure will likely serve you better. The right choice depends on what you're actually going to do with the loan, not just what sounds appealing in theory.

Call one of our team or book an appointment at a time that works for you. We'll walk through your situation, explain how each rate type applies to your plans, and help you structure a loan that fits the way you're actually using the property.

Frequently Asked Questions

What happens if I need to sell my investment property during a fixed rate period?

If you sell during a fixed rate period, you may be charged break costs by your lender. These costs depend on the difference between your fixed rate and current wholesale rates. If rates have fallen since you fixed, break costs can be significant.

Can I make extra repayments on a fixed rate investment loan?

Most lenders allow extra repayments of up to $10,000 to $30,000 per year on fixed rate loans. Repayments beyond that limit may trigger break costs. You also typically can't redraw extra payments during the fixed period.

How do split rate loans work for investment properties?

A split rate loan divides your loan into a fixed portion and a variable portion. You lock in certainty on part of the loan while keeping flexibility on the rest. This lets you make extra repayments and access features like offset accounts on the variable portion without break costs.

Do fixed rate investment loans affect my ability to claim negative gearing?

Fixed rates don't change your ability to claim deductions, but they do lock in your repayment amount. Under new rules from July 2027, losses on established properties bought after May 2026 can only offset rental income or property capital gains, so you need to model cash flow without relying on salary offsets.

When should I choose a fixed rate over a variable rate for an investment loan?

Fixed rates suit investors who want repayment certainty and aren't planning to access equity, make large extra repayments, or sell in the near term. If you need flexibility or plan to build a portfolio quickly, a variable or split rate structure is usually more suitable.


Ready to get started?

Book a chat with a Finance & Mortgage Broker at Simple Lending today.