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

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:

1. Losing interest deductions on the investment portion.
2. Facing messy, expensive accountant work every year.
3. 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.

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?

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