Fixed Rate Investment Loans and Extra Repayments

Fixed rate investment loans lock in your interest rate for a set period, which can give you certainty around cash flow and rental income calculations.

But locking in a rate means you're also locking in your repayment structure. Most fixed rate loans limit how much extra you can pay without triggering break costs. In our experience, this catches property investors off guard because they assume that paying extra is always helpful, when in reality it can cost you money if you have a fixed rate loan.

How Much Extra Can You Pay on a Fixed Rate Investment Loan?

Most lenders allow between $10,000 and $30,000 in extra repayments per year on a fixed rate investment loan without penalty. If you pay more than that limit, you'll be charged break costs, which can run into thousands of dollars depending on how much rates have moved since you fixed and how long remains on your fixed term. The exact threshold depends on your lender and loan contract, so you need to check your specific terms before making additional payments.

Consider a property investor in Ellenbrook who bought a rental property on a five-year fixed rate at 5.2% with an $500,000 investment loan. Two years into the fixed term, interest rates have dropped to 4.8%, and they've received a $25,000 inheritance they'd like to put toward the loan. Their lender allows $10,000 per year in extra repayments without penalty. If they pay the full $25,000, they'll exceed their annual limit by $15,000. Because rates have fallen since they fixed, the lender calculates break costs based on the economic loss they incur from not receiving the contracted 5.2% interest on that $15,000 over the remaining three years. In this scenario, the break cost came to $1,800. The investor decided to pay exactly $10,000 and put the remaining $15,000 into their offset account linked to their variable rate owner-occupied loan instead, avoiding the penalty entirely.

Why Fixed Rate Investment Loans Have Repayment Limits

Lenders set extra repayment limits on fixed rate loans because they borrow money at a fixed rate to fund your loan. When you pay extra, you're reducing the loan balance earlier than expected, which disrupts their interest margin and funding arrangements. If interest rates have fallen since you fixed, the lender cannot reinvest that money at the same rate, creating an economic loss they recover through break costs. If rates have risen, break costs may be minimal or non-existent because the lender can reinvest at a higher rate.

This structure is different from variable rate loans, where you can usually make unlimited extra repayments without penalty because the lender can adjust their funding arrangements as your balance changes.

When Extra Repayments Make Sense on an Investment Loan

The decision to make extra repayments on an investment loan depends more on tax strategy than just reducing interest. Unlike your owner-occupied home, the interest on an investment loan is tax deductible. Paying down your investment loan faster means you're reducing a tax-deductible expense while potentially still carrying non-deductible debt on your home.

If you have both an owner-occupied loan and an investment property loan, it usually makes more financial sense to direct extra payments toward the non-deductible home loan first. This approach preserves the tax deduction on your rental property while reducing the debt that doesn't give you any tax benefit.

As an example, consider someone with a $400,000 owner-occupied loan at a variable rate and a $350,000 investment loan on a three-year fixed rate at 5.4%. They have $20,000 available to put toward debt reduction. Their fixed rate investment loan allows $10,000 per year in extra repayments. If they put the full $20,000 against the investment loan, they'll incur break costs of around $1,200 based on current rate differences, and they'll reduce their tax-deductible interest expense. If they instead put $10,000 toward the investment loan (within the penalty-free limit) and $10,000 toward their owner-occupied loan, they avoid break costs and reduce non-deductible interest. At a marginal tax rate of 37%, the interest saved on the owner-occupied loan delivers a greater after-tax benefit than the same dollar amount paid against the investment loan.

Offset Accounts as an Alternative to Extra Repayments

Some lenders offer offset accounts on fixed rate investment loans, though this feature is less common than on variable rate products. An offset account lets you park savings against your loan balance without technically making an extra repayment, so you reduce the interest charged without triggering break costs. Not all fixed rate investment loans include this option, and those that do may come with a slightly higher interest rate to compensate for the flexibility.

If you're choosing between a fixed rate investment loan with an offset and one without, the decision depends on how much surplus cash flow you expect to have during the fixed period. In areas like Canning Vale or Byford in Western Australia, where rental yields on new housing estates can generate stronger cash flow, having an offset account can let you capture the benefit of that surplus income without reducing your tax-deductible debt permanently. You're still getting the interest rate certainty of a fixed loan, but you're maintaining the flexibility to redraw those funds if you need them for property expenses or another investment opportunity.

Fixed Rate Expiry and Your Repayment Strategy

When your fixed rate period ends, your loan typically reverts to the lender's standard variable rate unless you take action. This is the moment when repayment flexibility opens up again, and it's worth reviewing whether refinancing your investment loan makes sense or whether switching to a new fixed term suits your property investment strategy. If you've been accumulating cash in an offset or holding back extra repayments during the fixed period, the fixed rate expiry gives you the chance to reassess your debt structure without penalty.

You can redirect repayments across your loan portfolio, make lump sum payments without restriction, or adjust to interest-only repayments if that aligns better with your cash flow needs and tax planning. The expiry date is also when you'll see whether the variable rate your loan reverts to is higher or lower than what you've been paying, which can change how you prioritise debt reduction across your investment and owner-occupied properties.

Frequently Asked Questions