Investment Loans: Fixed, Variable, and Split Options

Most investors choose a rate structure without fully understanding the financial impact over the life of the loan.

That decision affects your borrowing capacity, your cash flow, and the flexibility you have when market conditions shift. The three main options are fixed rate, variable rate, and split rate, and each serves a different purpose depending on your property investment strategy and how you manage risk.

Fixed Rate Investment Loans Lock In Certainty

A fixed rate investment loan holds your interest rate at the same level for a set period, typically between one and five years. Your repayments remain the same regardless of what the Reserve Bank does during that time.

This matters if you're buying a property with a tight rental yield and limited buffer. Consider an investor who purchases a two-bedroom unit near Rosebud foreshore with rental income of $450 per week. If rates rise by one percent during the first two years, their variable repayments would increase by around $300 per month on a $500,000 loan. A fixed rate removes that risk during the fixed period, which makes budgeting more predictable and allows you to calculate exactly what your negative gearing position will be when completing your tax return.

Fixed rates come with restrictions. You typically cannot make extra repayments beyond a small annual threshold without triggering break costs, and if you want to refinance or sell before the fixed term ends, those break costs can reach tens of thousands of dollars depending on rate movements. You also lose access to offset accounts in most cases, which reduces the tax efficiency of holding surplus cash.

Variable Rate Investment Loans Offer Full Flexibility

A variable rate investment loan moves up or down in line with lender pricing decisions, which are influenced by the Reserve Bank cash rate and funding costs. You have no certainty around what your repayments will be in six months, but you gain full flexibility to make extra repayments, redraw funds, and refinance without penalty.

Flexibility becomes valuable when your portfolio grows. If you purchase a second investment property using equity from the first, you may need to access that equity through a refinance or top-up. A variable loan allows that without delay or cost. Offset accounts are also available on most variable investment loans, meaning any cash sitting in the offset reduces the interest charged on your loan balance. That cash remains accessible, which is useful if you need to cover unexpected repairs, periods of vacancy, or body corporate special levies.

The downside is exposure to rate increases. If rates move higher, your repayments increase and your cash flow tightens. That can affect your ability to hold the property if rental income does not keep pace, particularly in areas like Rosebud where vacancy rates can fluctuate during off-peak months.

How a Split Rate Loan Works in Practice

A split rate loan divides your total loan amount between a fixed portion and a variable portion. You choose the percentage allocated to each, commonly splitting 50/50 or 60/40 depending on your circumstances.

This structure is used when you want some certainty without sacrificing all flexibility. As an example, an investor purchasing a property in Rosebud West might fix 60 percent of a $600,000 investment loan for three years and leave 40 percent on a variable rate with an offset account. The fixed portion protects most of the repayment from rate increases, while the variable portion allows access to redraw, extra repayments, and the ability to hold surplus cash in offset to reduce interest.

The challenge is that a split loan requires more active management. You need to track two loan accounts, monitor when the fixed portion expires, and decide whether to refix, switch to variable, or adjust the split ratio. Many investors set a calendar reminder for six months before the fixed term ends so they can review rates and make an informed decision rather than rolling onto a higher revert rate by default.

Choosing Between Principal and Interest or Interest Only

Most variable and split investment loans allow you to choose between principal and interest repayments or interest only repayments for a set period, usually up to five years. Fixed rate loans may offer interest only depending on the lender, though the choice is less common on longer fixed terms.

Interest only repayments are lower because you are not reducing the loan balance. This improves cash flow in the short term and may increase your tax deductions, as the full loan balance remains in place and continues to accrue interest. Many investors use interest only during the first few years while building a portfolio, then switch to principal and interest once they have multiple properties and want to start reducing debt.

Principal and interest repayments build equity from day one. If your goal is to use that equity to fund a second purchase within a few years, paying down the loan faster may suit your strategy. It also reduces the total interest paid over the life of the loan, though that is less relevant if you plan to hold the property long term and prioritise portfolio growth over debt reduction in the early years.

What to Consider Before Locking In a Fixed Rate

Fixed rates look appealing when variable rates are rising or when you expect further increases. The mistake is locking in without understanding the exit costs.

Break costs apply when you pay out a fixed loan early, whether through sale, refinance, or switching to variable. The calculation compares the interest rate you locked in with the current wholesale rate the lender can achieve on the remaining fixed term. If rates have fallen since you fixed, the lender has lost income and you pay the difference. That amount can be substantial on larger loan balances with several years remaining.

Before fixing, consider how long you plan to hold the property, whether you might need to access equity during the fixed period, and whether you have the cash flow buffer to manage repayments if your circumstances change. If you are likely to sell or refinance within two years, a fixed rate introduces more risk than it removes.

Rate Discounts and How Lenders Price Investment Loans

Investment loans are priced higher than owner-occupier home loans because lenders view them as higher risk. The gap is typically between 0.20 and 0.50 percent depending on the lender, your deposit size, and your overall borrowing position.

Rate discounts depend on your loan to value ratio, the strength of your application, and the lender's current appetite for investment lending. A 20 percent deposit usually attracts a better rate than a 10 percent deposit, and avoiding Lenders Mortgage Insurance by staying under 80 percent LVR often unlocks additional pricing benefits. Some lenders also offer larger discounts on variable rates if you hold an offset account or package your loan with other products, though those discounts need to be weighed against any annual fees.

If you are refinancing an existing investment loan, the rate discount may depend on the size of the loan and whether you are consolidating multiple properties under one lender. We regularly see investors achieve better pricing by moving their full portfolio to a single lender rather than splitting across multiple institutions, though that approach depends on each lender's serviceability assessment and policy settings.

How Recent Budget Changes Affect Rate Structure Decisions

From 1 July 2027, negative gearing and capital gains tax treatment will change for established residential investment properties purchased after 12 May 2026. Losses from those properties can only be offset against other residential property income, not salary or wages, and the 50 percent capital gains tax discount is being replaced with an inflation-indexed model and a 30 percent minimum tax on gains.

If you purchased an established property in Rosebud before Budget night in May 2026, your existing tax treatment is grandfathered. If you are considering a new purchase, the reduced tax benefits may influence how much cash flow buffer you need, which in turn affects whether a fixed or variable rate structure suits your position. Investors buying new builds retain access to full negative gearing and can choose between the old and new capital gains tax arrangements, which may tilt the decision toward new construction in areas where land supply allows it.

These changes do not alter the mechanics of fixed, variable, or split loans, but they do change the financial context in which you choose between them. If your tax deductions are reduced and your cash flow is tighter, locking in a fixed rate may provide the certainty needed to hold the property through the first few years. Alternatively, if you plan to build a portfolio quickly using equity release, a variable rate structure may remain the most practical option despite the tax changes.

Accessing Investment Loan Options Across Multiple Lenders

Each lender has different policy settings around investment loans, including how they assess rental income, whether they apply a vacancy rate or loading, and what loan to value ratio they will lend to depending on location and property type. A mortgage broker in Rosebud can compare investment loan options from banks and lenders across Australia and identify which structures align with your circumstances.

Some lenders allow higher borrowing on interest only terms, others offer better fixed rates for longer terms, and a few specialise in lending to investors with multiple properties or complex income structures. Working with a broker also means you can access lender panels that may not be available directly, and you receive guidance on structuring the loan to support future portfolio growth rather than just securing approval for a single purchase.

Call one of our team or book an appointment at a time that works for you.

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