Beginner's Guide to Fixed Rate Investment Loans

Fixed rate investment loans let you lock in your interest rate for a set period, typically between one and five years.

Warnbro investors have been weighing up fixed rates more carefully since the legislative changes to negative gearing came into effect. With properties in the suburb now sitting at a median of $736,000 for houses and rental yields around 4.3%, understanding how fixed rate features interact with your investment strategy matters more than the rate itself.

What Fixed Rate Features Do Investment Lenders Offer

Most lenders offer fixed rate periods from one to five years on investment loans, with three-year terms being the most common choice. During the fixed period, your interest rate and minimum repayment amount stay the same regardless of what happens to variable rates. You also gain certainty over your holding costs, which helps when calculating cash flow for negatively geared properties under the new rules. Fixed rate investment loans generally allow extra repayments up to $10,000 to $30,000 per year depending on the lender, though some products lock you in completely. Offset accounts are rarely available on fixed rate investment loans, and when they are, the rate is usually higher. Most lenders permit switching from interest-only to principal and interest during the fixed term, but moving the other direction requires refinancing or waiting until the fixed period ends.

Consider an investor who purchased a $736,000 property in Warnbro at the suburb's median with a 20% deposit. They locked in a three-year fixed rate on an interest-only loan in late 2026. The rental income is $610 per week, and their interest-only repayment is fixed for three years. They know their exact holding cost for the next 36 months, which makes it easier to quarantine the loss under the new negative gearing rules that apply from the 2027-28 income year. They factored in body corporate fees and property management costs, and their quarterly loss sits at roughly $1,800. That loss can still be claimed against salary income because the property was contracted before 12 May 2026, but the fixed rate gives them cash flow certainty while the tax treatment plays out.

Should You Fix the Entire Loan Amount or Split It

You don't have to fix your entire loan. A split structure lets you fix part of the loan and leave the rest variable. Splitting gives you partial protection from rate rises while keeping access to offset accounts and unlimited extra repayments on the variable portion. It also means you can refinance or pay down part of the loan without triggering break costs on the full amount. Most lenders allow up to five splits on a single loan, though two or three splits is more common in practice. The split percentage depends on your risk tolerance and how much cash flow flexibility you need. A 50/50 split is popular, but some investors fix 70% if they want more certainty or only 30% if they think rates will fall.

In our experience, Warnbro investors with multiple properties often split the loan 60% fixed and 40% variable. The fixed portion covers the base holding cost, and the variable portion lets them use offset accounts to manage tax deductions across the portfolio. If they sell another property and want to pay down debt, they can direct the funds to the variable portion without penalty.

How Long Should You Fix an Investment Loan For

One-year fixed rates are useful when you expect rates to fall soon but want short-term certainty. Three-year fixed rates are the most common because they balance rate protection with flexibility. Five-year fixed rates lock you in for longer, which reduces your options if your circumstances change or if you want to access equity for another purchase. The right term depends on your cash flow position, your view on where rates are heading, and how long you plan to hold the property. Investment loans with longer fixed periods generally carry higher break costs if you need to exit early, and they limit your ability to refinance to a better product without paying thousands in penalties.

Warnbro properties have seen tight stock levels and rental demand has pushed vacancy rates down across the Rockingham area. If you're holding a property for long-term capital growth and the rental income covers most of your holding costs, a three-year fix gives you breathing room without locking you in past the next market cycle.

What Happens When Your Fixed Rate Period Ends

When the fixed period ends, your loan automatically reverts to the lender's standard variable rate unless you take action. The standard variable rate is usually higher than the lender's best discounted variable rate, sometimes by 0.5% to 1.0% or more. You can negotiate a new fixed rate before expiry, switch to a discounted variable rate with the same lender, or refinance to a different lender. Some lenders let you lock in a new fixed rate up to 90 days before expiry, which can be useful if rates are rising. If your loan is interest-only and the interest-only period also expires at the same time as the fixed rate, your repayments can jump significantly as the loan converts to principal and interest at the higher standard variable rate.

An investor we worked with recently had a three-year fixed rate end on a Warnbro investment property. The loan reverted to a standard variable rate of 7.2%, and the interest-only period also expired. Their repayment jumped from $2,100 per month interest-only to $3,400 per month principal and interest. They refinanced to a new lender with a discounted variable rate of 6.1% and extended the interest-only period for another five years, bringing the repayment back down to $2,200 per month. The refinance cost about $1,800 in application and valuation fees, but the saving over 12 months was more than $9,000.

Can You Access Equity or Make Extra Repayments on a Fixed Rate Loan

Most fixed rate investment loans allow limited extra repayments, typically between $10,000 and $30,000 per year depending on the lender. Anything above that limit triggers break costs. You can usually redraw funds you've paid extra during the fixed period, but only up to the amount you've contributed above the minimum repayment, and some lenders don't allow redraw on fixed investment loans at all. Accessing equity through a top-up or by refinancing during the fixed period will also trigger break costs, which can run into tens of thousands of dollars if rates have fallen since you fixed. If you think you'll need to access equity within the next few years to fund another purchase or renovation, a variable loan or a split structure makes more sense than fixing the full amount.

Warnbro investors looking to build a portfolio often leave at least 40% of the loan variable so they can access equity when the next opportunity comes up without paying break costs on the fixed portion. With the median house price sitting at $736,000 and rental yields at 4.3%, many investors are holding properties in Warnbro as part of a longer-term strategy and want the flexibility to leverage equity as values rise.

Do Fixed Rates Work for Interest-Only Investment Loans

You can fix an interest-only investment loan, and many investors do exactly that. Fixing on interest-only gives you certainty over your cash flow and maximises your tax deductions during the fixed period, since you're only paying interest and not reducing the loan balance. The interest-only period is separate from the fixed rate period, and they don't always line up. You might have a three-year fixed rate and a five-year interest-only approval, or a five-year fixed rate and a three-year interest-only period. If the interest-only period expires before the fixed rate ends, the loan converts to principal and interest at the fixed rate, and your repayment increases. If the fixed rate expires first, the loan reverts to the lender's standard variable rate while remaining interest-only until that approval runs out.

An investor holding a Warnbro property at the suburb's median with a 30% deposit and a five-year interest-only fixed loan can claim the full interest cost as a deduction each year. The repayment stays the same for the full five years, and the investor can use the cash flow saved by not paying principal to fund deposits on additional properties or offset other loans in the portfolio. The fixed rate protects them if variable rates rise, and the interest-only structure keeps the holding cost as low as possible during the accumulation phase.

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