Selling a former home that has been rented out can create a significant capital gains tax (CGT) question. The common concern is whether the “six-year rule” can protect the sale from CGT, particularly when you have moved for work, upgraded to another home or held the property as a long-term rental.
The rule can be valuable, but it is not automatic and it does not make every former home fully CGT-free. The result depends on how the property was used before and after you moved out, whether you treated another property as your main residence, and the records you can produce if the ATO asks questions.
How the six-year rule works for a former home
Australia’s main residence exemption can generally disregard a capital gain or capital loss on a dwelling that is your home. The absence rule can extend that treatment after you move out, provided the property was genuinely your main residence before the absence began.
If you move out and use the former home to produce assessable income, such as by renting it out or making it available for rent, you may choose to keep treating it as your main residence for CGT purposes for up to six years during that absence. If the property is not used to produce assessable income, the absence rule can apply indefinitely while that situation continues.
Importantly, this is a CGT choice rather than something you must formally elect when you first move out. The choice is generally made when you prepare the tax return for the year in which you sell the property. However, the decision relies on the facts and records from years earlier, so planning cannot wait until the sale contract is signed.
The key limitation is that, while you apply the absence rule to a former home, you generally cannot also treat another dwelling as your main residence. There is a limited overlap rule when changing homes, but it applies only where its conditions are satisfied.
Seven ways property owners may reduce CGT
1. Establish that the property was genuinely your home before you leave
The six-year rule starts with a property that was your main residence. Buying a property, changing your mailing address and moving in briefly without genuinely making it your home may not be enough.
The ATO considers a range of practical indicators when determining whether a dwelling is a main residence. These can include where you and your family live, where your belongings are kept, the address used for mail and electoral enrolment, connected utilities, and your intention in occupying the property. There is no fixed minimum period of occupation, but the occupation must be genuine in the circumstances.
Keep evidence that supports the property’s status as your home, including:
- settlement and loan documents
- utility accounts and insurance records
- electoral roll and mailing-address updates
- photos, removalist invoices and evidence of personal belongings at the property
- records showing where your spouse or family lived, where relevant
- a clear timeline of when you moved in and moved out.
This is particularly important for small business owners, contractors and professionals who move between cities for projects or work opportunities.
2. Track the six-year period from the first income-producing use
The six-year rule is most commonly relevant where a former home is rented after the owner moves out. The period is not simply a rough estimate based on when you “became an investor”. It should be tracked carefully from the relevant change in use, including periods where the property is advertised or otherwise used to earn rental income.
If the property is used to produce income for longer than the maximum period during one absence, a partial main residence exemption may still be available. In that case, CGT is not necessarily calculated across the entire ownership period, but the exempt and taxable periods need to be correctly identified.
Do not assume a short vacancy automatically restarts the clock. The law allows an additional maximum six-year period when the dwelling again becomes, and later ceases to be, your main residence. That makes the reality of your return to the property important.
3. Return to the property only where it is a genuine move back home
A genuine return to live in the property can create a fresh period of absence for the purposes of the rule. This can be relevant for owners who move interstate, return home for a period, then relocate again for family or work reasons.
There is no prescribed minimum number of days, months or years that a person must occupy a dwelling before it can be their main residence. However, that does not mean a token stay will necessarily achieve the desired tax result. The broader facts must show that the property was truly your home again, rather than a temporary arrangement created solely to reset a CGT period.
Before relying on a return to the property, consider whether you can demonstrate practical indicators of living there, such as moving belongings back, using that address for personal correspondence and utilities, and actually making it the centre of your domestic life.
4. Choose carefully between an old home and a new home
A common mistake is assuming two properties can both be fully exempt for an extended period. In most cases, you need to choose which dwelling is treated as your main residence during an overlap or absence period.
The law contains a limited concession when you acquire a new home before selling the old one. Subject to conditions, both homes may be treated as main residences for the shorter of the period between acquiring the new home and selling the old one, or six months. The previous home must also meet specific recent-use conditions, including a continuous period as your main residence and restrictions on income-producing use during the relevant period.
For couples, the position can be more complex. Spouses who are not permanently living separately may need to make a joint choice about which dwelling is the main residence, or accept that the exemption is split under the applicable rules.
This choice is often best assessed before buying a replacement home. The property with the larger potential gain, the longer expected holding period and the future plans for each dwelling can all affect the outcome.
5. Obtain a reliable market valuation when the home first becomes a rental
Where a dwelling was your main residence and is later first used to produce income, a special market-value rule may apply if a partial main residence exemption is ultimately available. Broadly, this can mean the property is treated as acquired at its market value at the time of first income-producing use, rather than at its original purchase price.
This can be helpful because growth in value while the property was fully covered by the main residence exemption may not form part of the later taxable gain. But it also means the valuation date is crucial.
A formal valuation obtained when the property first becomes a rental can be far more persuasive than trying to reconstruct a value many years later. At a minimum, retain contemporaneous sales evidence, agent appraisals, photographs, lease documents and records of the property’s condition.
The market-value rule does not apply in every situation. For example, prior income-producing use, foreign-residency issues, inherited property and relationship-breakdown transfers can alter the analysis.
6. Build and preserve an accurate CGT cost base
If a full exemption is not available, a well-supported cost base can reduce the taxable capital gain. The cost base rules recognise several categories of expenditure, including the amount paid to acquire the property, certain acquisition and sale costs, capital improvements and some ownership costs where they have not been claimed as tax deductions.
Depending on the circumstances, relevant records may include:
- purchase contract and settlement statement
- transfer duty and conveyancing costs
- buyer’s-agent, valuation and legal fees
- selling-agent commission, advertising and sale legal costs
- invoices for capital improvements, such as extensions, structural renovations or permanent landscaping
- evidence of ownership costs that were not claimed, and could not be claimed, as deductions.
A cost cannot generally be counted twice. For example, an amount claimed as a rental deduction or a capital works deduction may affect what can be included in the CGT calculation.
Good record-keeping is not merely an administrative task. It can materially affect the calculation if the property is partly taxable.
7. Consider the sale contract date, capital losses and CGT discount rules
For a standard property sale, the CGT event generally happens when you enter into the sale contract, not when settlement occurs. This can affect which income year includes the gain and whether the property is still within an available absence-rule period at the time of disposal.
Timing should be approached cautiously. A delayed settlement does not usually change the CGT year if the contract has already been signed. Similarly, a rushed contract should not be entered into simply for tax reasons without considering the commercial, legal and personal consequences.
If a taxable capital gain remains after applying the main residence rules, other CGT rules may be relevant. Capital losses can generally be applied against capital gains, but they cannot be used to reduce salary, business income or rental income. Individuals may also be eligible for the CGT discount where the statutory conditions are met, including the required ownership period.
A practical example
Consider an owner who buys and genuinely lives in a townhouse as their home. Several years later, they accept a role in another city, move out and rent the townhouse to tenants.
If they do not treat another property as their main residence during the relevant rental period, they may be able to use the absence rule for up to six years. If they sign a contract to sell within that period, the gain may be fully disregarded, subject to the broader main residence conditions and their individual circumstances.
If the owner instead keeps renting the townhouse beyond the available period, the property may only receive a partial exemption. A market valuation from when it was first rented, together with complete improvement and selling-cost records, may then become central to working out the taxable amount.
Records and traps to address before selling
The six-year rule is often discussed as if it is a simple “rent it out for six years” concession. In practice, the difficult issues are usually factual and documentary.
Before listing a former home for sale, review:
- the date you first moved into the property
- the date you moved out
- every period it was rented, advertised for rent or vacant
- whether you bought or lived in another property
- whether a spouse had a different main residence
- whether you returned and genuinely re-established the property as your home
- the date the property first produced income
- the evidence supporting the market value at that point
- purchase, improvement and sale documents
- any capital losses carried forward from earlier years.
Ownership structure also matters. The main residence exemption is designed around individuals and ownership interests in dwellings. Properties held through a company, trust or superannuation fund can require a substantially different analysis, even where a director, beneficiary or member lives in the property.
The key takeaway
The six-year rule can be one of the most valuable CGT concessions available to Australian property owners who move out of a genuine home and later rent it out. Its value depends on disciplined timing, a clear main-residence history, careful choices between properties and reliable records.
General information only. This article is not personal financial or tax advice. Before selling a former home, speak with a registered tax agent or accountant, such as, about your ownership structure, residency, family circumstances and CGT position.