How often should I review my loan splits and offsets?

Aim for at least an annual review, plus any time your situation changes significantly, such as buying or selling property, renovating, starting a business or changing investment strategy. Regular reviews let you adjust splits, move offset links and confirm that your actual cashflows still match the tax position you and your accountant are relying on.

Article

Structuring Splits, Offsets and Redraw To Protect Tax-Deductible Debt

How to use loan splits, offsets and redraw so you can clearly track deductible vs non‑deductible interest, avoid ATO tracing headaches and keep a debt recycling plan clean under the 2026–27 negative gearing changes.

Published 27 July 2026Updated 8 Sept 2026Reviewed 8 Sept 20268 min read

Key Takeaway

This article explains how Australian borrowers can use loan splits, offset accounts and redraw to cleanly separate deductible and non-deductible debt, which is critical under ATO “purpose and tracing” rules and upcoming 2026–27 negative gearing changes. It compares offsets versus redraw, shows why mixed-purpose loans are a tax risk, and gives a worked example. The key actionable step is to refinance into clearly labelled splits and direct all surplus cash into the non-deductible home split via an offset, not redraw.

Structuring Splits, Offsets and Redraw To Protect Tax-Deductible Debt

This topic is covered in full on Tailored Loans Sydney

Read the full guide on tailoredloans.sydney

For Australian borrowers using debt recycling or gearing, the safest way to track deductible vs non‑deductible debt is: 1) separate loan splits by purpose (home, investment, business), 2) park surplus cash in an offset against the non‑deductible home split, and 3) avoid using redraw for mixed purposes. That combination keeps interest deductibility clear under ATO tracing rules and flexible as tax laws change.

Why tracking deductible vs non‑deductible debt is non‑negotiable now

Negative gearing and investment tax rules are tightening from 1 July 2027, especially for established properties bought after 12 May 2026. The ATO already focuses on purpose and tracing – what you borrowed for, and where repayments came from.

If you mix home and investment spending in one loan or redraw, you risk:

Losing interest deductions on the investment portion.
Facing messy, expensive accountant work every year.
Being stuck if you later want to refinance or sell just one asset.

Clean splits and smart use of offsets and redraw are now more important than squeezing an extra 0.20% off the rate.

Diagram of single home loan split into home, investment and business parts Separate loan splits by purpose to keep deductible and non-deductible interest clear.

Core tools: splits, offsets and redraw – what they actually do

Loan splits – one facility, multiple clear purposes

A loan split is simply carving your total mortgage into separate accounts inside the one home loan contract – for example:

Split A – $700,000 – home (non‑deductible)
Split B – $200,000 – investment (deductible)
Split C – $80,000 – business equipment (potentially deductible)

Each split has its own balance, repayment and sometimes different rate/term.

Key benefits:

Clear tax tracing by purpose.
Ability to pay down non‑deductible debt faster.
Option to fix, refinance or close one split without disturbing the others.

This aligns with a core principle we use across guides like How to Restructure Property Loans Before Negative Gearing Shrinks: separate by purpose, not by property.

Offset accounts – cash parked beside the loan

An offset account is a transaction account linked to a loan split. The balance reduces interest charged, but does not reduce the legal loan balance.

Best practice for debt recycling:

Link your main offset to the non‑deductible home split.
Keep investment and business cash in separate offsets, not mixed with personal spending, as we discuss in Smartly coordinating home, investment and business loans across East and Inner South.

Redraw – money you’ve already repaid

Redraw lets you take back extra repayments made on a loan split. The tax danger is that every redraw changes the purpose of that part of the loan.

Use redraw cautiously:

If you redraw from a home (non‑deductible) split to invest, that portion can become deductible.
If you later redraw from the same split for a holiday, you have a mixed‑purpose loan that’s hard to trace.

The ATO guidance is clear: interest is deductible only to the extent the current use of the borrowed funds is income‑producing.

Offset vs redraw vs extra repayment: which to use when?

Scenario	Best tool	Why it works tax‑wise
Building a buffer for living costs	Offset on home	Reduces non‑deductible interest; balance remains flexible.
Saving for future investments	Separate offset	Keeps investment cash separate for clean tracing.
Tightening cashflow, no investing plans	Extra repayment	Safely reduces non‑deductible balance permanently.
Drawing equity to invest (debt recycle)	New investment split, minimal redraw	Clear investment purpose, simple to trace.
Funding mixed personal + investment uses	Avoid redraw	Creates spaghetti tracing and accountant headaches.

A general rule: offset preserves options; redraw rewrites history.

Worked example: clean vs messy debt recycling structure

Scenario - Home value: $1.4m - Existing home loan: $900,000 (one large split) - Goal: start a simple debt recycling plan investing $200,000 into ETFs. ### Messy approach – one big loan and redraw 1. You aggressively repay $200,000 into the single home loan. 2. You then redraw $200,000 and invest it. 3. A year later, you redraw another $50,000 for a car. Result: - You now have one $750,000 loan with two purposes: $200,000 investment, $50,000 car, the rest home. - Every future repayment has to be split…

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Frequently asked questions

Interest is generally deductible when the borrowed funds are used to produce assessable income, such as rent or business income. The ATO focuses on how each drawdown was used, not just what property secures the loan. Keeping separate loan splits and clear records of drawdowns, repayments and redraws makes it much easier to support your deductions at tax time.

For most borrowers, an offset linked to the non-deductible home split is safer than using redraw heavily when debt recycling. An offset reduces interest without changing the loan’s purpose or legal balance, so future deductibility is preserved. Redraw changes the purpose of part of the loan each time you use it, which can quickly create mixed-purpose, hard-to-trace debt.

Often you can, depending on your lender’s policy. Many people fix the investment split for cashflow certainty and keep the home split variable with an offset for flexibility. However, fixed splits may limit extra repayments or offset access, so you should match the choice to your 3–5 year plans and understand any break costs before fixing.

You usually cannot perfectly unwind the history, but you can stop things getting worse and improve future tracing. First, avoid further mixed redraws. Then, work with your broker and accountant to refinance into new splits that reflect today’s balances by purpose. From there, direct extra repayments to the non-deductible parts and keep new investment borrowing quarantined.

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