Avoid These Fixed Rate Mistakes on Investment Loans

Making extra repayments on a fixed rate investment loan can cost you thousands in break fees and reduce your tax position.

Brighton property investors often lock in fixed rates for certainty, then assume they can pay down the principal when rental income improves or they receive a bonus. Unlike owner-occupied loans, where reducing debt quickly usually makes sense, investment loans operate differently. The interest is tax deductible, the loan structure supports other investment decisions, and fixed rate products carry penalties that can wipe out years of savings.

Why Extra Repayments Trigger Break Costs on Fixed Rates

When you fix an investment loan, the lender locks in the wholesale cost of funding that loan for the fixed period. If you repay principal early, the lender loses the margin they expected to earn and may face a loss on the wholesale funding contract. That loss is passed to you as a break cost. The calculation depends on the gap between your fixed rate and current wholesale rates. If rates have fallen since you fixed, break costs can run into tens of thousands of dollars.

Consider a Brighton investor who fixed a loan of $800,000 at 5.2 per cent in early 2024 for three years. By mid-2026, variable rates had dropped. The investor received a $50,000 inheritance and made a lump sum repayment without checking the terms. The lender calculated a break cost of $22,000, charged to the loan immediately. The investor also reduced their deductible interest by roughly $2,600 per year, assuming the loan remained interest-only. The combined effect eliminated most of the benefit from the repayment.

The Tax Impact of Reducing Deductible Debt

Interest on borrowings used to acquire or hold a rental property is deductible against rental income and other assessable income under current rules. When you make extra repayments, you reduce the outstanding principal and the interest charged. That lowers your deductions and increases your taxable income. For an investor in the 37 per cent marginal bracket, every $1,000 reduction in deductible interest costs $370 in additional tax. The actual cost depends on your marginal rate, but the direction is always the same.

This effect becomes permanent if you later redraw the funds or increase the loan for non-investment purposes. The ATO treats redrawn amounts as new borrowings. If the purpose of the redraw is private, the interest on that portion is not deductible, even though the original loan was for investment. Once you blur the purpose of the borrowing, you lose the ability to claim the full interest deduction going forward.

What Happens to Flexibility When You Fix

Most fixed rate products do not offer redraw or offset accounts. If they do, the facility is usually restricted or comes with conditions that limit access. Variable rate loans typically include full redraw and offset, so any extra repayment can be accessed later without reapplying. On a fixed rate loan, once you make an extra repayment within the allowable annual limit, that money is often locked in until the fixed period ends. If you need those funds before then, you face break costs to refinance or access cannot occur at all.

The lack of an offset account also matters for investors who accumulate rental income or other cash reserves. On a variable loan, parking funds in an offset reduces interest without reducing the loan balance or the deductible amount. On a fixed loan without offset, you either make a repayment and lose flexibility, or leave the cash in a transaction account earning minimal interest while paying a higher rate on the loan.

When You Can Make Extra Repayments Without Penalty

Some lenders allow extra repayments up to a set limit each year without charging break costs. The limit is usually $10,000 or $20,000 per annum on the fixed portion. Check your loan contract or product disclosure statement for the exact figure. Any repayment above that threshold during the fixed period will trigger a break cost calculation. Even within the limit, you still reduce your deductible interest, so the tax effect remains.

If your goal is to reduce total interest paid over the life of the loan, making extra repayments after the fixed period ends is more effective. Once the loan reverts to variable, most products allow unlimited extra repayments and full redraw without penalty. You can also refinance to a product with offset if you want ongoing flexibility. Timing the repayment to avoid both break costs and the loss of deductible debt gives you more control.

Split Loans as an Alternative to Full Fixed Rates

Splitting your investment loan between fixed and variable portions gives you partial rate certainty while preserving access to offset and redraw on the variable portion. A common structure is 50 per cent fixed and 50 per cent variable, though the ratio depends on your risk tolerance and cash flow needs. The variable portion carries the offset account, so surplus rental income or other funds reduce interest without affecting the loan balance or your deductions.

If you want to make extra repayments, you direct them to the variable portion. You avoid break costs, retain full redraw, and still reduce interest over time. The fixed portion remains untouched, preserving the interest deduction and the locked rate. This structure works particularly well for Brighton investors holding properties in precincts like the Golden Mile or near Bay Street, where rental yields are lower and capital growth is the primary driver. Preserving deductible debt and flexibility supports a longer hold period without forcing early asset sales to access equity.

How Negative Gearing Changes Affect Repayment Decisions

From 1 July 2027, net rental losses on residential properties acquired on or after 7:30pm AEST on 12 May 2026 can only be offset against residential rental income or carried forward. They cannot be offset against salary or wages. Properties held before that date remain under existing rules and can continue to be negatively geared in the traditional sense. For investors who purchased before the cutoff, maintaining deductible debt remains valuable because those losses can still reduce tax on employment income.

If you bought an investment property in Brighton before mid-May 2026 and fixed the loan, making extra repayments reduces the interest deduction you can claim against your salary. That increases your taxable income and your tax liability. For properties acquired after the cutoff, the benefit of deductible interest is smaller if you have no other rental income to offset it against, but the principle still applies. Reducing deductible debt without a clear strategy can leave you paying more tax and holding less flexibility, regardless of when you purchased.

Refinancing a Fixed Rate Investment Loan Early

If you want to access equity, switch to a lender with lower rates, or move to a structure with offset, you can refinance before the fixed period ends. The new lender will not waive the break cost, you will need to pay it as part of the exit from the existing loan. In some cases, the new lender may absorb the cost as a refinance incentive, but this is rare and usually requires a large loan balance and strong equity position.

Before refinancing, compare the break cost against the benefit of the new loan. If the rate saving is small or the new loan has higher fees, refinancing may not recover the cost within a reasonable period. If you are refinancing to access equity for another investment, model the combined position to confirm the new structure supports your goals. Refinancing purely to make extra repayments usually does not make sense when the cost of exit is factored in.

Practical Steps Before Making Extra Repayments

Contact your lender or broker and request a break cost estimate before making any lump sum repayment on a fixed investment loan. The estimate is usually provided within a few days and is valid for a short window. If the cost is high, consider holding the funds in a high interest savings account or offset on another loan until the fixed period ends. If the cost is low or zero because rates have risen, confirm the annual limit and proceed within that threshold if it aligns with your strategy.

Also review your overall debt structure with a tax adviser or mortgage broker before committing funds. If you have other non-deductible debt such as an owner-occupied mortgage or car loan, paying that down first may deliver a larger net benefit. If you plan to purchase another investment property in the next few years, holding liquid reserves rather than locking funds into a fixed loan gives you more options when the opportunity arises.

Frequently Asked Questions