Avoid These 4 Extra Repayment Mistakes on Variable Investment Loans

Paying extra into your variable rate investment loan sounds like a solid move until you realise you've wiped out thousands in deductible interest and tied up cash you needed for your next purchase.

The difference between an owner-occupied loan and an investment loan isn't just the rate you pay. It's how the interest works for you. Interest on an investment property loan is deductible against your rental income and other assessable income, so reducing that interest by hammering the loan with extra repayments can actually cost you more at tax time than it saves you in interest. The decision to pay extra depends on what you're building towards and whether you plan to keep borrowing.

Mistake One: Paying Down the Loan Without Checking Your Tax Position

Extra repayments reduce your loan balance, which reduces the interest you pay, which reduces the deduction you can claim. If you're negatively geared and relying on that loss to offset other income, paying the loan down too fast can push you into a higher effective tax position without improving your cash flow.

Consider a buyer who purchases a unit in Killarney Vale as an investment property on a variable rate loan. The property brings in rental income, but after interest, body corporate fees, council rates and insurance, it runs at a loss each year. That loss reduces taxable income from their salary. If they start making large extra repayments, the interest component drops, the loss shrinks, and they end up paying more tax without freeing up any usable cash because the money is now locked in the property.

Investors holding properties acquired before May 2026 can continue to deduct losses against all income. Properties purchased after that date are subject to new rules from the 2027-28 income year, where losses can only offset income from other residential properties unless the property qualifies as a new build. Either way, the principle holds: reducing deductible interest changes your tax outcome, and that needs to be weighed against the interest saved.

Mistake Two: Locking Cash in the Loan When You Could Use It for Leverage

Variable rate loans typically allow you to redraw funds you've paid ahead, but not all lenders offer full flexibility and some impose conditions or fees. More importantly, once you've paid the loan down, you've reduced the equity available to borrow against for your next purchase unless you refinance or increase the limit.

Investors building a portfolio usually want to keep cash accessible. Paying extra into the loan can feel productive, but if your strategy involves buying another property in the next year or two, that cash sitting in a redraw facility isn't automatically available as a deposit. Lenders assess borrowing capacity based on your current debts, income and expenses. They don't give you credit for funds in redraw when calculating how much you can borrow, though some will allow you to use those funds as part of your deposit once the application is underway.

A better option for many investors is to keep extra cash in an offset account rather than paying it directly off the loan. The interest saving is identical because the offset balance reduces the amount of interest calculated daily, but the funds remain fully accessible and don't reduce your deductible interest for tax purposes. Not all investment loan products include an offset account, and some that do charge a higher rate or annual fee, so the structure needs to match your intention.

Mistake Three: Assuming Extra Repayments Are Reversible Without Cost

Redraw facilities on variable investment loans let you pull back extra payments, but the availability isn't guaranteed and lenders can restrict access under certain conditions, particularly if your financial position changes or if you've missed payments. Some lenders also treat redraw as a new borrowing event and may require you to reapply or provide updated income evidence.

In our experience, investors often assume redraw works like a transaction account. It doesn't. The funds belong to the lender until you request them, and that request can be declined. If you're relying on redraw to fund a deposit or cover an unexpected cost, the timing and certainty matter. An offset account gives you direct control without needing lender approval each time you access the funds.

There's also the issue of how extra repayments interact with your loan structure if you later want to release equity or refinance. Paying the loan down and then redrawing to buy another investment property can blur the purpose of the borrowing, which affects deductibility. Interest is only deductible to the extent the borrowed funds are used to produce assessable income. If you redraw for a private purpose, that portion of the interest becomes non-deductible, even though it's secured against the investment property. Keeping the funds separate from the start avoids that problem.

Mistake Four: Ignoring How Extra Repayments Affect Future Borrowing Capacity

When you apply for a new loan, lenders assess your income, expenses, existing debts and how much you can afford to repay. Under the current rules, lenders must assess your capacity to service the loan at a rate at least 3 percentage points above the actual loan rate. They also apply debt-to-income limits, which restrict how much you can borrow relative to your total income.

Paying down your existing investment loan reduces the required minimum repayment, which can improve your borrowing capacity slightly, but it also reduces the equity you can access without refinancing. If property values in Killarney Vale have increased since you bought, you might have enough equity to borrow again without selling, but only if the loan balance is low enough to keep your loan-to-value ratio within the lender's policy. Paying extra into the loan improves that ratio, but if you've used up all your cash doing it, you won't have a deposit for the next property and you'll need to refinance to pull the equity back out.

Refinancing to access equity involves a full application, valuation, and often legal costs. It also resets your loan, which might mean losing any rate discount or feature you negotiated on the original loan. For investors who plan to keep buying, keeping cash accessible and managing the loan balance strategically makes more sense than paying it down aggressively and then reversing the process.

Another factor is how lenders treat rental income. Most lenders will only count 80 per cent of the rental income when assessing your borrowing capacity, to allow for vacancy and maintenance costs. If your investment property is running at a loss after applying that discount, it reduces how much you can borrow for the next purchase. Paying the loan down doesn't change the rental income, so it doesn't improve your capacity as much as investors expect. You're usually better off holding cash or investing it in a way that generates assessable income, rather than locking it into a loan that's already being serviced comfortably.

Killarney Vale sits close to the lake and the highway, and the suburb has a mix of older units and newer townhouses. Investors here are often local buyers from the Central Coast or Sydney who want something within reach that doesn't need a huge deposit. The rental market is steady, driven by families and retirees who want access to Tuggerah and the beaches without paying Terrigal prices. Properties in the suburb don't usually see sharp price jumps, so investors rely on holding long term and keeping their loan structure flexible enough to add to the portfolio when the next opportunity comes up.

If you're holding a variable rate investment loan and you've been putting extra into it without a clear reason, it's worth reviewing whether that's helping or limiting what you can do next. Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions