Understanding the 6 Year Rule for Property Investments and the CGT Exemption

If you’ve moved out of your home and started renting it out, you may not owe a cent in capital gains tax when you eventually sell. That’s the essence of the ATO’s 6 year rule, and for Australian property owners, it’s one of the most valuable tax provisions available.

The rule allows you to treat your former principal place of residence (PPR) as your main home for CGT purposes for up to six years after you move out, provided you’re using it to produce income such as rent. Done right, any capital gain on the sale remains fully exempt. Done wrong (or misunderstood) you could face a significant and avoidable tax bill.

Here’s what you need to know.

 

What Is the 6 Year Rule?

The 6 year rule is a provision under Australian tax law that lets property owners continue to claim the main residence CGT exemption on a property they’ve moved out of, for up to six years, as long as they’re renting it out during their absence.

Without this rule, your home would stop being your main residence the moment you stopped living in it. CGT would then apply to any capital growth from that point forward. The 6 year rule acts as an extension, keeping the exemption alive during a defined period of absence.

One important detail: if you move out but don’t rent the property out, the exemption continues indefinitely. The six-year clock only starts ticking once the property begins generating income.

 

Who Can Use It?

To qualify, the property must have genuinely been your principal place of residence before you rented it out. The ATO takes this seriously. A property you purchased purely as an investment and never occupied as your home won’t be eligible.

The key eligibility requirements for the main residence exemption are:

You must be an Australian tax resident when the CGT event (sale) occurs. You cannot nominate another property as your main residence during the same period, you can only have one main residence at a time. The absence period must not exceed six years if the property is income-producing.

Foreign residents are generally not entitled to the main residence exemption at the point of sale, with limited exceptions under the life events test. If you’ve moved overseas and become a foreign resident for tax purposes, get specific advice before selling.

 

How the Exemption Works in Practice

Say you bought a house in Brisbane in 2015 and lived in it as your main home until 2019. You then moved interstate for work and rented the property out. In 2024, you sell it. That’s a five-year rental period, well within the six-year limit. Provided you didn’t nominate another property as your main residence during that time, the full capital gain on the sale is exempt from CGT.

Now change the scenario slightly. You rent it out from 2019 to 2026, seven years. CGT applies to the portion of the gain that falls after the six-year mark. You’ll need to calculate the gain using the market value of the property at the time you first used it to produce income as the cost base, rather than the original purchase price. This is known as the “home first used to produce income” rule.

The six-year period also resets between absences. If you move back into the property for a time and then move out again, a fresh six-year window opens for that new absence period. This gives property owners real flexibility to manage their property portfolio tax effectively over the long term.

 

The Relationship Between the 6 Year Rule and CGT

Capital gains tax applies to the profit made when you dispose of an asset. For most investment properties, CGT is calculated on the difference between the sale price and the cost base, which includes the purchase price, stamp duty, legal fees, and the cost of any capital improvements.

Your principal place of residence is normally fully exempt from CGT. The 6 year rule extends that exemption to cover periods when you’re not physically living in the property, up to six years if it’s rented, and indefinitely if it sits vacant.

The 50% CGT discount also remains available if the property has been held for more than 12 months. If you exceed the six-year limit and CGT does apply to part of your gain, the discount can significantly reduce the taxable amount for individuals. For full detail on how the discount interacts with partial exemptions, the CGT discount concessions rules are worth understanding.

 

What Happens If You Partially Used the Property for Income Before Moving Out?

This is where things get more complicated, and it’s one of the most common mistakes people make.

If you rented out part of your home, a spare room through Airbnb, for example, while you were still living there, that portion of the property is no longer fully eligible for the main residence exemption. The continuing main residence rule (the 6 year rule) applies to your whole home, but only if it was your whole home that qualified as your main residence in the first place.

So if 25% of the floor space was income-producing while you lived there, then 25% of any capital gain is assessable, even during the six-year absence period. It’s a detail that can cost you far more in tax than the rental income was ever worth.

 

Keeping Track of Your Cost Base

Your cost base is what you subtract from the sale proceeds to calculate your capital gain. Getting it right matters, particularly if CGT ends up applying to any portion of the gain.

The cost base includes the original purchase price, stamp duty and conveyancing fees paid at acquisition, the cost of any capital improvements, and incidental costs of disposal such as agent’s commission and legal fees at sale. Note that ongoing maintenance and repairs are generally not included in the cost base, even though they’re deductible against rental income. The two categories are treated differently for tax purposes.

If you exceed the six-year absence limit, the cost base resets to the market value of the property at the time you first used it to produce income. You’ll need a formal property valuation dated to that point. Without one, you’re relying on an estimate that the ATO may challenge, so it’s worth commissioning a valuation early.

For a detailed breakdown of what you can and can’t claim as a residential rental property expense, including the distinction between capital and revenue expenditure, the ATO has clear guidelines worth reviewing.

 

When the 6 Year Rule Doesn’t Apply

The rule won’t help you if the property was never your main residence. An investment property bought and immediately rented out doesn’t qualify, full stop.

It also won’t apply if you designate another property as your main residence during the same period. You can only elect one home as your principal residence at a time. If you buy a new home while renting out the old one, you’ll need to decide which property you’re treating as your main residence for each income year. Getting the election wrong can cost you the exemption on one or both properties.

Properties used for business purposes during the period of ownership face additional complications and may only attract a partial exemption.

 

Record Keeping and ATO Compliance

The ATO expects you to keep complete records of everything related to your property, from the date of purchase through to the date of sale. For the 6 year rule specifically, that means documenting when you moved out, when the tenancy began, the rental income received, all rental-related expenses, any capital improvements made, and the dates you moved back in if applicable.

Good records serve two purposes. They protect you if the ATO asks questions, and they give your accountant the information needed to calculate your CGT liability accurately and claim every available concession.

Keep those records for five years after you lodge the tax return for the year you dispose of the property. That’s the ATO’s minimum requirement.

 

The 6 Year Rule and Estate Planning

The 6 year rule doesn’t disappear when a property passes through an estate, but the rules become more layered. Beneficiaries generally inherit the deceased’s cost base and ownership period, but the main residence exemption eligibility depends on how and when the property is sold.

If you own a rental property that was once your home and you’re thinking about what happens to it after your death, consider how the CGT position will affect your beneficiaries. Timing the sale relative to the date of death, residency status of beneficiaries, and the application of the two-year post-death exemption window are all factors that can dramatically change the outcome. Working through those questions with a tax professional as part of your estate planning is worth doing well before they become urgent.

 

After the Six Years Are Up

If you’ve hit the six-year mark and the property is still rented, CGT will apply to a proportion of the gain from that point. You don’t lose the exemption for the first six years, those remain protected. CGT only bites on the portion of the gain attributable to the period beyond six years.

The calculation uses a time-based apportionment method. Days over the limit divided by total days of ownership (from the deemed acquisition date) gives you the taxable fraction of the gain. The 50% CGT discount then applies to that fraction, provided you’ve held the property for more than 12 months.

One option before the six-year mark expires: move back in. Even a genuine period of reoccupation as your main residence resets the clock, and a new six-year window opens if you move out again. There are no rules limiting how many times this can happen, but the reoccupation needs to be real. The ATO looks at whether the property was genuinely your main residence during that period, not just technically nominated as such.

 

Getting the Most Out of This Rule

A few practical points worth flagging.

You make your choice to treat the property as your main residence in the income year you sell, not at the time you move out. There’s no requirement to lodge anything with the ATO when you first rent out the property. The election is made retrospectively on your tax return for the year of sale.

Second, if you own the former home alongside another property you’re treating as your main residence, you’ll need to choose. Both properties can’t simultaneously claim the full exemption. A tax adviser can help you model which election produces the better outcome depending on the relative capital gains involved.

Third, if there’s any possibility you’ve exceeded six years or that your eligibility is unclear, get a proper valuation of the property at the date it first became income-producing. Without that, calculating CGT accurately is guesswork.

Working with experienced accountants who understand property taxation in depth means these decisions are made with the full picture in front of you, not after the fact.

For further detail on how the absence rule interacts with the main residence exemption across different scenarios, the Bentleys guide to CGT and your former home covers the key calculations and worked examples in plain language.

 

Disclaimer: This information is general in nature and should not be relied on as advice. It does not take into account the objectives, financial situation or needs of any particular person. You need to consider your financial situation and needs and seek professional advice before making any decisions based on this information.

 

FAQs

What is the 6 year rule for property in Australia?

The 6 year rule allows Australian property owners to continue treating a former main residence as exempt from capital gains tax for up to six years after moving out if the property is used to produce income.

Does the 6 year rule apply if I do not rent out the property?

Yes. If the property is not producing income after you move out, you may continue treating it as your main residence indefinitely without a six-year limit.

Can I claim the main residence exemption on two properties at once?

Generally no. Australian tax law usually allows only one property to be treated as your main residence at any given time.

How do I qualify for the 6 year rule?

You must first establish the property as your genuine main residence before moving out and renting it or otherwise producing income from it.

What happens if I move back into the property?

Moving back in and re-establishing the property as your main residence resets the six-year absence period for future use.

Can I use the 6 year rule more than once?

Yes. There is no limit on how many times the rule can apply, provided you genuinely reoccupy the property between absence periods.

What if I rent my property for more than 6 years?

You may still receive a partial CGT exemption, but capital gains tax may apply to the portion of the ownership period exceeding six years of absence.

Does the 6 year rule apply to foreign residents?

Generally no. Foreign residents for tax purposes are usually unable to access the main residence exemption when selling Australian property.

Do I need a property valuation when I move out?

Yes. Obtaining a market valuation when the property first becomes income-producing is important for future CGT calculations.

Is the 6 year rule automatic or do I need to apply?

You do not formally apply in advance. The election is generally made when lodging your tax return in the year the property is sold.

Can I use the 6 year rule for a holiday home?

No. The property must first have been your genuine principal place of residence before the absence rule can apply.

How does the 6 year rule affect my annual tax return?

You must still declare all rental income and claim eligible deductions while the property is rented, even if CGT relief later applies.

Does the rule apply to land over 2 hectares?

No. The main residence exemption generally applies only to the dwelling and up to two hectares of adjacent land.

What records should I keep for the ATO?

You should keep records of ownership dates, rental agreements, valuations, expenses, and acquisition and disposal costs for at least five years.

Can a company or trust own the property?

Generally no. The 6 year rule and main residence exemption usually apply only to properties owned by individuals.

Does moving for work affect the 6 year rule?

No. Moving for employment is a common reason for using the rule and does not affect eligibility.

What is the 6 month rule for moving between houses?

This concession allows you to treat two homes as your main residence for up to six months while transitioning between properties.

Is there a minimum time I must live in a house to call it a main residence?

The ATO does not specify a minimum timeframe but looks for evidence that the property was genuinely your primary residence.

How is CGT calculated if I exceed 6 years?

The taxable portion is generally calculated on a pro-rata basis according to the time the property exceeded the six-year absence limit.

Can I use the 6 year rule if I subdivided the land?

Usually only the portion containing the dwelling remains eligible for the exemption, while subdivided vacant land may become taxable.

Do I pay tax on rental income while using the 6 year rule?

Yes. Rental income remains assessable and must be declared to the ATO each financial year.

What if I move into aged care?

If the property is rented while you are in aged care, the six-year limit generally applies. If it is not rented, the exemption may continue indefinitely.

Does the 12 month CGT discount still apply?

Yes. If only part of the gain is taxable and you owned the property for more than 12 months, the 50% CGT discount may still apply.

Does the 6 year rule apply to inherited property?

Inherited properties follow separate CGT rules and concessions, including specific deceased estate provisions.

Who can provide authorised advice on the 6 year rule?

You should seek guidance from a registered Australian tax agent or qualified accountant familiar with current ATO regulations.