How to Restructure Your Home Loan To Maximise Legit Tax Deductions

You can’t just “make your home loan tax‑deductible”, but you can restructure it so more of your future interest is deductible, by separating home and investment borrowing and following ATO loan tracing rules.

Interest is deductible when the borrowed money is used to produce assessable income (ATO TR 2000/2), not simply because the loan is secured against an investment or your home.

1. The core idea: turn bad debt into good debt, within the rules

At a high level, the strategy is:

1. Keep your home loan (non‑deductible) in one clean split.
2. Create separate investment and/or business splits.
3. Direct extra repayments to the home split.
4. Re‑borrow from investment splits for income‑producing purposes only.

Over time, more of your total debt becomes tax‑deductible while your home loan shrinks. This is the engine behind debt recycling – covered in more detail in /insights/beginners-guide-debt-recycling-australian-homeowners.

Quick worked example

• $800,000 owner‑occupied home loan
• $3,000/month surplus after living costs

If you simply pay your minimum and invest $3,000/month from cash, your home loan barely moves.

If instead you:

• Split into $650,000 home + $150,000 investment
• Hammer extra $3,000/month into the home split
• Re‑borrow from the investment split to buy ETFs/property

…you gradually convert non‑deductible home debt into investment debt that may be deductible.

Splitting your home loan by purpose makes tax-deductible and non-deductible interest much easier to manage.

2. Loan tracing: how the ATO decides what’s deductible

The ATO looks at how each dollar was used, not what secures the loan. This is called loan tracing.

Key rules:

• Purpose test – Borrowings must be used to produce assessable income (rent, business income, dividends, interest) to claim interest.
• Mixed‑purpose loans – If a loan funds both investment and private spending, interest must be apportioned.
• Redraw risk – Redrawing from an investment or recycling split for private expenses contaminates the loan and forces messy apportionment (see fact 3 above).

This is why structure matters. Good structure makes loan tracing simple and defensible.

Clean structure usually means:

• One or more home splits – non‑deductible, P&I.
• One or more investment splits – potentially deductible, often IO.
• Optional business split – dedicated to business purposes.