When to Split Your Investment Loan Structure

A split structure gives you two or more loan accounts against the same property.

You might lock a portion at a fixed rate while leaving another portion variable, or set one account to interest-only while another is principal-and-interest. The split protects you from rate movements, keeps your options open as policy changes land, and lets you claim deductions where you need them without locking down your whole loan.

Why Police Officers Use Split Structures More Than Most Investors

Shift work makes repayment flexibility critical, and multiple-property investors in uniform are exposed to new quarantining rules from July next year. A single-structure loan can become a liability when your roster changes, your next purchase is a new build, or you need to redirect cash to a non-deductible debt.

Consider a Senior Constable holding two properties: a Brisbane unit acquired three years ago and a newly built townhouse in Logan settled last month. The unit remains eligible for unrestricted negative gearing under the grandfathering rule, while the new townhouse qualifies as an eligible new build. A single variable-rate loan across both properties would miss the chance to isolate the new build's tax treatment, and a single fixed-rate loan would prevent redraw when overtime dries up between rosters. A split structure—fixed and interest-only on the new build, variable and principal-and-interest on the unit—preserves the different tax positions and keeps cash accessible.

Fixed-Variable Splits and the 2027 Indexation Change

Locking a portion of your loan shields that slice of debt from rate rises, but the capital gains changes next July make the decision more involved for properties bought after May last year.

From 1 July 2027, the fifty per cent discount disappears for post-May 2026 purchases that are not eligible new builds. Those properties move to cost-base indexation and a thirty per cent minimum tax on real gains. Eligible new builds retain the choice between the discount and indexation. If you are holding a non-eligible property for capital growth and expect a long hold, paying down principal might reduce your eventual taxable gain, even though the interest deduction shrinks. If you are holding an eligible new build, the discount election may favour interest-only to maximise the deduction now. A fifty-fifty fixed-variable split on a non-eligible property lets you fix repayment certainty on half the debt while keeping the variable half in redraw for offset or early paydown as your strategy firms up closer to sale.

Interest-Only Splits When Rental Losses Are Quarantined

Quarantining begins on 1 July 2027 for non-eligible properties acquired after 12 May 2026. You cannot offset those losses against your police salary. You can only carry them forward against future rental income or future residential capital gains.

An interest-only account maximises your annual deduction and your carry-forward loss, which becomes valuable once the property turns positive or you sell. A principal-and-interest account on the same loan reduces your interest cost and your carry-forward loss, but it also builds non-deductible equity that you might want to release later for another deposit. Splitting the loan—half interest-only, half principal-and-interest—gives you a growing loss to carry forward and a growing equity buffer that stays clean for reuse. The principal-and-interest portion also satisfies some lenders' portfolio serviceability tests when you apply for investment loan refinancing or a third property, because they see amortising debt even though the other half is interest-only.

Splitting by Purpose When You Borrow Against One Property to Fund Another

When you use equity in an existing property to fund a deposit on a second property, the ATO treats the new borrowing according to its purpose. Interest on the amount used for the investment deposit is deductible. Interest on any amount used for private purposes is not.

If you take out a hundred and fifty thousand against your owner-occupied home to fund a deposit on a rental property, that entire loan is deductible even though it is secured by your home. If you take out two hundred thousand and use fifty thousand to renovate your kitchen, you need two splits: one for the investment portion and one for the private portion. Lenders will not track purpose for you. You create separate loan accounts at settlement, and you never cross-contaminate the funds. This applies equally when you are pulling equity from one investment property to buy another, particularly if any of the released funds go toward non-deductible debt like a car loan. A dedicated split for each purpose protects the deduction and survives an ATO review.

When Splitting Adds Cost Without Adding Value

Every loan account attracts its own set of fees. Two splits mean two application fees at origination, two annual package fees if the lender charges them, and two discharge fees at exit.

If your total borrowing is under three hundred thousand and you do not expect to buy another property in the next few years, a split structure usually costs more than it saves. The value in splitting comes from protecting different tax treatments, hedging rate risk on large debt, or keeping equity available for reuse. A single variable loan with an offset account delivers most of the cash-flow flexibility a shift worker needs without doubling the administration. Splitting makes sense when you hold multiple properties, when you are subject to quarantining, when you have crossed the six-times debt-to-income threshold and need to show amortising debt, or when you are using equity release and must separate purpose. Outside those scenarios, keep the structure simple.

Setting Up the Split Before Settlement

You nominate the split in your loan application. The lender establishes separate accounts, and the funds settle into those accounts on the same day.

Changing a single loan into a split after settlement is treated as a refinance. You will pay discharge fees on the old loan, application fees on the new loans, and in some cases a second round of valuation and legal fees. If you know you want a split, specify it up front. Your broker can model different split ratios—sixty-forty, seventy-thirty, fifty-fifty—and show you the repayment difference under current settings and under forecast rate movements. Most lenders allow up to five splits against one security, though anything beyond three splits adds confusion without much tactical gain. Two or three accounts cover the majority of structures police investors actually use.

If you are buying your first investment or adding to an existing portfolio, talk through the structure before the lender sees your application. Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions