How To Use The Six‑Year Rule With Geared Properties Safely

Using the six‑year rule with geared properties: what actually happens

The six‑year rule lets you move out of your home, rent it, and still treat it as your main residence for capital gains tax (CGT) for up to six years, provided you don’t nominate another property as your main residence in that period. When the property is geared (has a loan), you can often claim interest as a tax deduction while still potentially paying no CGT when you sell. But the fine print – especially loan purpose and dates – will decide whether this works for you or backfires.

In this guide we’ll cover how the six‑year rule and the main residence exemption interact with debt, what records you must keep, and how to decide whether to keep, restructure or sell a geared former home in the next few years.

Mapping your dates is the first step to using the six‑year rule safely.

1. Quick refresher: main residence exemption and the six‑year rule

1.1 Main residence exemption in plain English

The main residence exemption is the rule that lets you sell your family home without paying CGT, provided:

• You actually lived in it as your home.
• It wasn’t mainly used to produce income (e.g. as a boarding house or office) in a way that breaks the full exemption.
• The land is generally 2 hectares or less.

If those conditions are met for your whole ownership period, the capital gain is usually fully disregarded for CGT purposes.

1.2 What is the six‑year rule?

The six‑year rule is a choice you can make when you move out and start renting your home.

In essence:

1. You treat the property as your main residence for CGT purposes even while it’s rented.
2. You can do this for up to six years per absence.
3. If you move back in, the six‑year clock can effectively reset and you may get another six‑year period if you move out again later.
4. You generally can’t claim another property as your main residence for CGT during the same period (with a short overlap allowed when you move between homes).

The rule is in the Income Tax Assessment Act and ATO guidance; always check the latest ATO materials or seek advice, because Budget 2026–27 reforms are tightening some CGT concessions.

1.3 Why geared properties make this more powerful – and more complex

When your former home has a loan and you rent it out, three things happen at once:

• The property may remain CGT‑free under the six‑year rule.
• It becomes an income‑producing asset, so interest and running costs are often deductible.
• The loan structure and purpose start to matter a lot more for tax and future flexibility.

This can be very attractive – negative gearing benefits while your capital gain may still be tax‑free – but only if your structure and timing are right.

2. How debt and interest deductions interact with the six‑year rule

2.1 Loan purpose vs CGT treatment

A key principle (confirmed across several of our guides) is:

Interest deductibility follows loan purpose, not which property secures the loan or whether CGT is payable.

That means:

• If the loan (or split) was used to buy or improve your home when it was your residence, that interest is not deductible, even if the property later becomes an investment.
• If a separate split was used to buy an investment property or fund renovations while it was being rented, that interest can usually be deductible, even if the property is still covered by the main residence exemption for CGT.

This aligns with knowledge facts 1, 2, 3, 5, 11 and 19: purpose‑based splits are essential for long‑term tax clarity.

2.2 Typical upgrade scenario with splits

Many people use this sequence:

1. Own Home A (with a home‑loan split) and live in it.
2. Decide to upgrade to Home B.
3. Keep Home A as a rental and move out.
4. Refinance and restructure the loans into:
   • Split 1: original balance used to buy Home A (non‑deductible but now secured by an investment property).
   • Split 2: new borrowing used as deposit/costs for Home B (non‑deductible – it funded the new home).

If you then increase the loan on Home A to fund the purchase of Home B, Split 1 and Split 2 remain non‑deductible, even though the loan is secured against an investment property.

You’ve now got a rental property with largely non‑deductible debt. This is exactly the scenario we warn about in our refinancing guide: see Refinancing An Investment Property Or Your Home: How The Rules Differ.

2.3 Can you claim interest if the gain is CGT‑free?

Yes – in many cases you can.

• CGT rules and income tax rules are separate systems.
• If you borrow for an income‑producing purpose (e.g. to buy or improve a rental property), the interest can often be deductible even if the eventual sale is CGT‑free under the main residence exemption or six‑year rule.

But this usually requires carefully documented loan splits and clear evidence of how each dollar was used.

2.4 When the six‑year rule doesn’t help your interest deductions

The six‑year rule only affects CGT on sale. It does not make non‑deductible interest magically deductible.

So you cannot:

• Re‑label old home‑loan debt as ‘investment’ just because the property is rented.
• Deduct interest on a split used for personal expenses (school fees, cars, medical costs) simply because the loan is now secured by a rental property.

This reflects knowledge fact 11: once non‑deductible, always non‑deductible unless you fully pay it out and redraw only for income‑producing use.