Fixed Rate Investment Loans & Common Mistakes

A fixed rate lock gives you payment certainty, but it also locks you into a structure that might not fit what the tax system or your portfolio actually needs over the next few years.

Federal tax changes starting in July 2027 mean new residential investment properties will face quarantined rental losses and indexation-based capital gains treatment. The decision between fixed and variable isn't just about rate protection anymore. It's about whether you can adjust loan features, refinance without penalty, or access equity when your borrowing capacity gets recalculated under tighter serviceability rules.

Why Investors on the Coast Are Reconsidering Full Fixed Structures

Toukley sits in a market where quarterly vacancy rates move quickly and rental demand shifts between Long Jetty, The Entrance, and the lakeside streets around Nora and Canton Beach. Locking a full loan amount into a three or five year fixed rate removes your ability to respond when those conditions change or when you need to pull equity for a second purchase.

A fixed rate gives you a known repayment for the fixed period. Variable rates move with the Reserve Bank cash rate and lender margin decisions, which means your repayment can rise or fall. The difference matters most when you're planning to refinance, access equity, or adjust between interest-only and principal-and-interest during the life of the loan. Fixed rate products charge break costs if you exit early, and those costs can run into five figures depending on rate movements and the remaining term.

In our experience, investors who fix the entire loan amount often find themselves stuck 18 months later when they want to leverage equity for the next purchase or when their lender's variable product offers better offset or redraw features that reduce taxable income.

The DTI Cap That Changes How Much You Can Borrow Next Time

APRA's debt-to-income settings now cap most lenders at funding no more than 20 per cent of new investor loans where your total debt is six times your gross income or higher. That cap applies separately to your investor portfolio, so every dollar you borrow now affects what you can access later.

Consider an investor earning $95,000 who borrows at an LVR of 80 per cent. At six times income, total investor debt hits $570,000. If this borrower locks the full amount into a fixed rate and wants to access equity in two years for a second property, they'll need to break the fixed loan or accept that the equity sits idle until the fixed term ends. Lenders calculate serviceability at the product rate plus a three percentage point buffer, so a fixed rate at 5.8 per cent gets tested at 8.8 per cent. If rates have dropped and the variable product sits at 5.4 per cent, the borrower is being assessed on a higher buffer than necessary, which shrinks the amount they can pull out as equity.

We regularly see this play out with Toukley buyers who purchase an older fibro or weatherboard rental near the lake and plan to add a second property within three years. The DTI cap means that second purchase might push them over six times income, so they need every dollar of borrowing capacity they can get. Being stuck in a fixed rate that tests higher than the current variable rate can be the difference between approval and rejection.

What the July 2027 Tax Changes Mean for Rate Choice

From July 2027, net rental losses on residential investment properties purchased after 7:30pm on 12 May 2026 can only be offset against other residential rental income or carried forward. You can't offset those losses against your salary anymore unless the property qualifies as an eligible new build that increases dwelling numbers.

This affects your rate decision in two ways. First, if you're buying an established property, you need rental income to cover or nearly cover your loan repayments, which makes interest-only structures and lower variable rates more attractive than higher fixed rates that increase your monthly outgoing. Second, if you're buying a new build to retain full negative gearing, you want the flexibility to refinance or adjust your loan when construction completes and rental income starts, which is much harder if you're mid-way through a fixed term with a different lender.

Properties held before that May 2026 cut-off can still be negatively geared under the old rules, so if you're refinancing an existing investment loan, you're not affected by the quarantine. But if you're purchasing now or in the next 12 months, the tax treatment will shape whether a fixed rate structure makes sense or whether you need the flexibility of variable with offset to minimise taxable interest.

Split Rate Structures and When They Actually Work

A split loan divides your borrowing between fixed and variable portions. You might fix 50 per cent at a known rate and leave 50 per cent variable with an offset account attached. The variable portion gives you somewhere to park rental income, savings, or sale proceeds, and the offset reduces the interest you're charged on that portion, which lowers your tax-deductible interest and your net cost.

Splits work when you want rate protection on part of the debt but you also expect lump sum repayments, equity access, or a refinance within the fixed period. They don't work if the fixed portion is too small to deliver any meaningful rate certainty, or if you split at a ratio that doesn't match your actual cash flow and portfolio plans.

As an example, an investor buying a two-bedroom villa unit near Wallarah Bay might borrow $480,000 at 80 per cent LVR. They fix $240,000 for three years at 5.9 per cent and leave $240,000 variable at 6.1 per cent with a full offset. Rental income of $520 per week plus their own savings sit in the offset account, reducing interest on the variable half. If they want to access equity in 18 months to purchase a second property in Wadalba or Hamlyn Terrace, they can refinance or increase the variable portion without paying break costs on the full loan amount. The fixed half continues undisturbed, and they've only exposed half the loan to any rate rise during that period.

Interest-Only Investment Loans and the Tax Deduction Trade-Off

Interest-only periods let you pay only the interest component for a set term, usually one to five years. Your loan balance doesn't reduce, but your repayment is lower, which can improve cash flow if rental income doesn't cover a principal-and-interest repayment.

Under the old tax rules, interest-only structures on investment loans were common because every dollar of interest was deductible and investors wanted to maximise that deduction while paying down non-deductible owner-occupier debt first. From July 2027, if your rental losses are quarantined, the value of that interest deduction drops. You're not offsetting it against salary, so you're only saving tax if you have other residential rental income or if you carry the loss forward to offset a future capital gain.

You can still choose interest-only on a fixed rate, but you're locking in a higher repayment amount with less flexibility. Interest-only fixed rates are typically 0.1 to 0.3 percentage points higher than principal-and-interest fixed rates, and if you want to switch to principal-and-interest during the fixed term, most lenders treat that as a variation that can trigger break costs or fees.

If you're buying an established property in Toukley after the May 2026 cut-off and your rental income is $480 per week while your principal-and-interest repayment at current variable rates sits around $520 per week, an interest-only period might close that gap. But if you fix that interest-only rate and rental income jumps or you want to pay down the loan faster, you're stuck until the fixed term ends.

Refinancing Out of a Fixed Rate and What Break Costs Look Like

Break costs apply when you exit a fixed rate loan before the term ends. The lender calculates the cost based on the difference between your fixed rate and the wholesale rate the lender can now earn on the money you're repaying early, multiplied by the remaining term.

If you fixed at 6.2 per cent and rates have since dropped, the lender loses income by taking your money back early. That loss gets passed to you. If rates have risen, the break cost is often zero or very small, because the lender can now lend that money out at a higher rate.

We've seen break costs range from a few hundred dollars to over $20,000 depending on the loan amount, remaining fixed term, and how far rates have moved. If you're refinancing to access equity or move to a lender with different investment loan options, you need to know whether the benefit of the new loan outweighs the cost of breaking the old one. Some lenders let you port a fixed rate to a new property if you're selling and buying at the same time, but that only works if your timing and loan amount align exactly.

If you've fixed a Toukley investment loan and you now want to purchase a second property using equity, your choices are to break the fixed loan and wear the cost, to borrow against another security if you have one, or to wait until the fixed term ends. None of those options give you the flexibility you'd have on a variable rate, which is why many investors on the Coast are either avoiding fixed rates entirely or fixing only a portion of the loan.

How Lenders Assess Investment Loan Serviceability on Fixed Versus Variable Products

Lenders test your ability to repay at the loan rate plus a three percentage point buffer. Rental income is included at 80 per cent of the verified market rent to account for vacancy and maintenance periods. If you're applying for a fixed rate at 5.8 per cent, you're assessed at 8.8 per cent. If the variable rate is 6.0 per cent, you're assessed at 9.0 per cent.

That difference sounds small, but on a $500,000 loan it can change your maximum borrowing by $15,000 to $25,000 depending on your income and other commitments. If you're at the edge of the DTI cap or your rental income only just covers the serviceability test, the product rate you choose affects whether the loan gets approved.

Some lenders also apply higher interest rate floors to investor loans than to owner-occupier loans, particularly if you're borrowing above 80 per cent LVR and paying Lenders Mortgage Insurance. If you're choosing between lenders based on rate, you also need to check how each lender treats rental income, whether they accept contract rent or only market rent, and whether they'll include rental income from a property that's still under construction or not yet tenanted.

What Happens When the Fixed Term Ends

At the end of a fixed rate term, your loan automatically rolls to the lender's variable rate unless you fix again or refinance. Most lenders' standard variable rates sit 0.3 to 0.8 percentage points higher than their advertised discounted variable rates, so if you do nothing, your repayment can jump significantly.

You'll usually receive a letter from your lender 30 to 60 days before the fixed term ends, offering you the option to refix or move to a discounted variable product. If you want to refinance to a different lender, you need to start that process at least 60 days out so the new loan can settle before the fixed term expires. If you miss that window and roll to the standard variable rate, you're free to refinance without break costs, but you'll pay the higher rate until the new loan settles.

If your circumstances have changed since you first fixed the loan, such as a drop in rental income, an increase in other debt, or a change in employment, the new lender will reassess your serviceability under current rules. That includes the DTI cap and the three percentage point buffer at current rates. If you no longer meet serviceability, you might be stuck with your existing lender, which is another reason to keep some portion of your loan variable from the start.

Call one of our team or book an appointment at a time that works for you. We'll walk through your current position, your plans for the next few years, and which rate structure actually fits what you're trying to build.

Frequently Asked Questions