Buying, living in, renting out or selling a home can have major capital gains tax consequences. For many Australians, the principal place of residence exemption can mean a capital gain on the family home is disregarded. However, the result can change quickly when a property is rented out, used for a business, held while building, or replaced with another home.
For sole traders especially, the issue is often not obvious. A home office, consulting room, studio or client-facing workspace may create a partial CGT exposure, even where the property has always been the place you call home.
In tax law, this concession is generally called the main residence exemption. “Principal place of residence” is the more familiar everyday term. The key is to plan before a change happens, maintain good records and understand which choices can be made when the property is eventually sold.
How the main residence exemption works
The basic exemption is available to an individual who owns a dwelling and uses it as their main residence throughout their ownership period. Where it applies in full, the capital gain or capital loss on disposal of the home is disregarded.
A property does not become your main residence simply because you intend it to be. Your actual use of the property matters. Relevant practical indicators can include whether you and your family live there, where your belongings are kept, where you receive mail and whether the address appears on records such as the electoral roll.
The exemption is not necessarily all or nothing. A partial exemption may apply where:
- the home was your main residence for only part of the time you owned it
- you rented out all or part of it
- you used part of it to produce assessable income through a business
- the property was held while you lived elsewhere
- the land attached to the dwelling exceeds the area that can ordinarily be fully covered by the exemption
- you were a foreign resident when the relevant CGT event occurred.
This is why property decisions should not be viewed only through the lens of rental income or business deductions. A deduction that appears worthwhile now may affect the CGT outcome later.
Seven ways to protect or reduce CGT on your home
1. Move in as soon as it is genuinely practicable
A delay between settlement and moving into a new home can create a gap in main residence coverage. The law can treat a dwelling as your main residence from acquisition where it becomes your main residence by the time it was first practicable for you to move in.
This is useful where a buyer needs to wait for settlement, undertake necessary work or deal with circumstances that genuinely prevent occupation. It is not a substitute for actually using the property as your home.
Keep records that support the timeline, such as:
- settlement documents
- removalist invoices
- utility connection records
- renovation or repair invoices
- correspondence showing why occupation could not occur earlier
- evidence of when you moved in.
For a sole trader, it is also sensible to keep business premises arrangements separate from evidence of residential occupation. A property can be both a home and a work location, but the tax treatment depends on how each part is used.
2. Use the limited overlap period when changing homes
It is common to buy a new home before selling the old one. The main residence rules recognise this practical reality by allowing both properties to be treated as a main residence for a limited overlap period, provided the relevant conditions are met.
The overlap period is limited to the shorter of six months ending when ownership of the old home ends, or the period between acquiring the new home and ending ownership of the old home.
There are conditions. In particular, the old home must generally have been your main residence for a continuous period before sale, and it cannot have been used to produce assessable income during a relevant part of the period when it was not your main residence.
The planning point is simple: avoid assuming that every period of dual ownership will be fully exempt. If settlement dates move, the old home is rented out, or the new property is not genuinely intended to become your home, the result may be different.
3. Consider the absence rule before renting out a former home
A former home may continue to be treated as your main residence after you move out. This is commonly known as the absence rule.
If you leave a home that was your main residence and rent it out, you may be able to continue treating it as your main residence for up to six years while it is used to produce income. This can be particularly relevant for people who relocate temporarily for work, move interstate, travel overseas or trial a new location before deciding whether to sell.
The important trade-off is that, during the period you choose to continue treating the former home as your main residence, you generally cannot also treat another property as your main residence. The limited overlap rule when moving house may still be available, but it should not be assumed.
A further benefit is that each new period of absence can potentially have its own period of coverage, provided the property again becomes your main residence before you leave again. The timing and facts matter, so this is an area where advice before signing a lease can be valuable.
4. Understand the different treatment of a vacant former home
If you move out and do not use the former home to produce assessable income, the absence rule can apply indefinitely. For example, the property may be left vacant, occupied rent-free in some circumstances, or retained while you live elsewhere.
This does not mean a property can be treated as a main residence forever while you also claim another home as your main residence. You still need to make a considered choice about which property receives main residence treatment.
The potential advantage is that a period without rental income may have a different CGT outcome from a period in which the property is leased or otherwise used to generate assessable income. That does not necessarily mean leaving a property vacant is commercially sensible. It means the income, cash flow and CGT consequences should be considered together.
5. Use the building or renovation rules where they apply
Building a new home, substantially renovating a property or rebuilding after demolition can create a CGT issue because land does not automatically receive full main residence treatment before there is a dwelling that you occupy.
The rules can allow you to choose to treat land as your main residence while you build, repair or renovate a dwelling. Broadly, the dwelling must become your main residence as soon as practicable after the work is finished and must remain your main residence for at least three months.
The period covered by this choice is generally limited. The legislation provides a four-year period before the dwelling becomes your main residence, although the Commissioner may allow a longer period in appropriate circumstances.
This can be valuable for owner-builders and homeowners undertaking major renovations. However, the choice also limits the ability to treat another dwelling as your main residence during the relevant period, apart from the limited moving-home overlap rules.
Before demolishing, rebuilding or moving out for a renovation, consider the full timeline. Construction delays, temporary accommodation, rental arrangements and the sale of an existing home can all affect the outcome.
6. Be deliberate about claiming home-based business occupancy expenses
Working from home does not automatically mean you lose the full main residence exemption. Many sole traders work at the kitchen table, in a spare bedroom used by the family, or from a laptop around the house. That is different from setting aside an area exclusively for business activities.
The CGT risk is more likely to arise where part of the home is used to produce assessable income and you could have claimed a deduction for interest on money borrowed to acquire the home. In practice, this can occur where there is a dedicated office, treatment room, studio, workshop or client waiting area.
The ATO distinguishes between:
- running expenses, such as electricity, internet and consumables, and
- occupancy expenses, such as mortgage interest, rent, council rates and similar property-related costs.
Claiming occupancy expenses for a dedicated business area can lead to a partial CGT exposure when the home is sold. The taxable component will generally depend on the extent of the area used for income-producing purposes and the time it was used that way.
For sole traders, the right approach is not simply “never claim anything”. It is to compare the immediate deduction with the possible future CGT cost and make a properly informed decision.
A home workspace that is shared with household use and not permanently set aside for business may have a different outcome from a separately fitted-out consulting room with regular client access.
7. Obtain a valuation when a home first becomes income-producing
If a home that has been fully covered by the main residence exemption is first used to produce assessable income, a special market value rule may apply. Where its conditions are met, you are treated as having acquired the property at its market value when it was first used to produce income.
This may be beneficial because growth in the property’s value up to that point can effectively be recognised within the period covered by the main residence exemption. Future CGT calculations are then based on the market value at the first income-producing use, rather than only the original purchase price.
The practical lesson is to obtain a defensible valuation at the right time. Do not wait until years later, when the evidence is weaker and the value may be difficult to establish.
This can be particularly important when:
- a home is first rented out after you move
- a former home remains rented beyond the period for which it can be treated as your main residence
- you begin using a dedicated part of your home for a business
- you convert a home into a mixed residential and income-producing property.
A formal valuation may not be necessary in every situation, but reliable contemporaneous evidence is far easier to obtain when the change occurs.
A practical scenario for a sole trader
Consider a graphic designer who owns and lives in a house. For several years, she works occasionally from the dining table and claims only work-related running expenses. She does not have a room exclusively set aside for her business.
Later, as the business grows, she converts a bedroom into a dedicated studio, meets clients there and claims a share of occupancy expenses relating to that area. A few years after that, she moves interstate and rents the whole property out.
The designer may need to consider several separate CGT issues:
- Whether the dedicated studio created a partial exemption while she lived in the home.
- Whether the former home can continue to be treated as her main residence during the rental period.
- Whether she is treating another property as her main residence during that time.
- Whether a valuation should be obtained when the property first became income-producing.
- How the business-use area and rental period should be reflected in the final CGT calculation.
The result may still be favourable, but it is unlikely to be as simple as treating the entire gain as automatically exempt.
Other traps that can limit the exemption
The main residence exemption is generous, but it has boundaries. A few issues commonly require closer review.
Property held through a company or trust
The basic exemption is available to individuals. If a home is owned by a company, the company does not receive the ordinary individual main residence exemption.
Trust ownership can also be complex. A beneficiary living in a trust-owned property should not assume they will receive the same outcome as an individual who owns their home directly. Specialist advice is important before acquiring, transferring or restructuring a home through an entity.
Couples with separate homes
Spouses who are not permanently separated and living apart cannot simply obtain a full exemption for two different homes for the same period. They generally need to choose one home as the main residence of both spouses, or nominate separate homes and accept a divided exemption outcome.
This can be relevant where one spouse works away from home, where a couple temporarily lives in separate cities or where each spouse retains a pre-relationship property.
Property on larger landholdings
The exemption can extend to adjacent land used primarily for private or domestic purposes with the home, but there is a maximum area that can ordinarily receive full treatment. Where a property exceeds that area, an apportionment may be needed.
This issue often arises with lifestyle properties, rural homes, hobby farms and larger suburban blocks. The use of the land matters, particularly where part of it is used in a business or to earn income.
Sale timing and records
For CGT purposes, the relevant event on a standard property sale is generally tied to the contract date, not settlement. This can affect the income year in which the gain, loss or exemption is reported.
Keep records from purchase through to sale, including:
- contract and settlement statements
- stamp duty and legal costs
- invoices for capital improvements
- valuations obtained when use changes
- rental agreements and property management statements
- dates of occupation, vacancy and rental use
- floor plans and records of business-use areas
- details of deductions claimed for occupancy expenses.
Plan before the property use changes
The main residence exemption is often most effective when it is considered before you move out, rent a room, establish a dedicated home business area or buy a replacement property.
A decision that is sensible for lifestyle or business reasons may still be the right one. The aim is not to let tax determine every property choice. It is to understand the CGT consequences early enough to preserve available options and maintain the evidence needed to support them.
The key takeaway is that your home can remain a highly tax-effective asset, but the exemption depends on ownership, actual use, timing and the choices you make along the way. If your circumstances involve a rental period, a sole trader business, a renovation, a move interstate or more than one property, can help you review the likely CGT position before you commit.
This article is general information only and is not personal financial or tax advice. Speak with a registered tax agent or accountant, such as, about your specific circumstances before relying on a CGT strategy or making a property decision.