Capital Gains Tax on Investment Property in Australia: Complete Guide

Capital gains tax (CGT) is one of the most significant tax considerations for Australian property investors. When you sell an investment property for more than you paid for it, the profit (the capital gain) is added to your taxable income and taxed at your marginal tax rate. Depending on the size of the gain and your income level, the CGT bill can run into tens or even hundreds of thousands of dollars.

Understanding how CGT works, how to calculate it correctly, and what strategies exist to minimise it legally is essential for every property investor. Getting this wrong can mean paying far more tax than necessary, or worse, running afoul of ATO compliance requirements.

In this guide, we cover everything you need to know about CGT on investment property in Australia.

What Is Capital Gains Tax?

Capital gains tax is not a separate tax. It is part of the income tax system. When you make a capital gain on an asset (including investment property), the gain is added to your assessable income for the financial year in which the CGT event occurs (typically the date of the sale contract). You then pay tax on that gain at your marginal income tax rate.

Important clarification: CGT only applies to investment properties and other assets. Your principal place of residence (PPOR), the home you live in, is generally exempt from CGT under the main residence exemption. We cover the tax differences between investment properties and your home in detail in our guide on investment property versus PPOR tax treatment.

When Does a CGT Event Occur?

For property, a CGT event typically occurs when you:

• Sell the property (the most common event). The CGT event date is the date the contract of sale is signed, not the settlement date
• Transfer the property as a gift or as part of a family arrangement
• Compulsorily acquire the property (for example, government acquisition for infrastructure)
• Destroy or lose the property (in limited circumstances, such as an uninsured total loss)

CGT does not apply while you simply hold the property. It only crystallises when a CGT event occurs. This is why investment property is often described as a "tax-deferred" asset: you benefit from capital growth year after year, but you do not pay tax on that growth until you sell.

How to Calculate Capital Gains Tax

Calculating CGT on an investment property involves three key steps: determining the cost base, calculating the capital gain, and applying any available discount.

Step 1: Determine the Cost Base

The cost base is not simply what you paid for the property. It includes all costs associated with acquiring, holding, and improving the property. Specifically, the cost base includes:

• Purchase price - The amount you paid for the property
• Incidental costs of acquisition - Stamp duty, conveyancing fees, building and pest inspection costs, and any buyer's agent fees
• Ownership costs (non-deductible only) - If you have had periods where the property was not income-producing and you could not claim certain costs as deductions, those costs may be added to the cost base. However, costs that were already claimed as tax deductions (such as interest, repairs, rates, and insurance while the property was rented) cannot be included
• Capital improvements - The cost of renovations and improvements that add to the property's value (as distinct from repairs and maintenance, which are claimed as deductions). Examples include adding a room, building a deck, installing a new kitchen, or landscaping
• Incidental costs of disposal - Agent's commission on sale, legal fees for the sale, marketing costs, and any other costs directly related to selling the property

The formula:

Capital Gain = Sale Price - Cost Base

Step 2: Calculate the Capital Gain

Once you have determined the cost base, subtract it from the sale price to arrive at the capital gain.

Example:

| Item | Amount | |---|---| | Sale price | $950,000 | | Purchase price | $650,000 | | Stamp duty on purchase | $25,000 | | Conveyancing (purchase) | $1,500 | | Capital improvements (new kitchen and bathroom) | $45,000 | | Agent commission on sale | $19,000 | | Conveyancing (sale) | $1,200 | | Total cost base | $741,700 | | Capital gain | $208,300 |

Step 3: Apply the 50% CGT Discount

If you are an Australian resident individual (not a company or trust with specific rules) and you have held the property for at least 12 months before the CGT event, you are entitled to the 50% CGT discount. This means only half of the capital gain is added to your taxable income.

Continuing the example:

Discounted capital gain = $208,300 x 50% = $104,150

This $104,150 is added to your other taxable income for the year. If your marginal tax rate is 37% (the rate for taxable income between $135,001 and $190,000 in 2025-26), the CGT payable would be approximately:

CGT payable = $104,150 x 37% = ~$38,536

Plus the 2% Medicare levy on the additional income.

Note: The 50% CGT discount is only available to individuals and trusts (with some conditions). Companies do not receive the 50% discount and pay CGT at the company tax rate on the full capital gain. Self-managed super funds receive a 33.33% discount (one-third reduction) rather than 50%.

The 50% CGT Discount: Eligibility Requirements

To qualify for the 50% CGT discount, all of the following must be true:

• You are an Australian resident for tax purposes (at the time of the CGT event and for the period of ownership, with some exceptions)
• You held the property for at least 12 months before the CGT event
• The property was acquired after 11:45am on 21 September 1999 (the date the discount was introduced)

The 12-month holding period is calculated from the date you acquired the property (typically the date of the purchase contract) to the date of the CGT event (the date of the sale contract). The period does not need to be exactly 12 months to the day. If the acquisition and disposal dates are more than 12 months apart, you qualify.

Important timing consideration: If you are close to the 12-month mark, delaying the sale by even a few weeks can save you tens of thousands of dollars in tax. For a $200,000 capital gain at a 37% marginal rate, the difference between receiving the 50% discount and not receiving it is approximately $37,000 in tax.

The Main Residence Exemption (PPOR Exemption)

Your principal place of residence is generally exempt from CGT. This means if you sell the home you live in, you typically pay no CGT on any capital gain, regardless of how large it is.

To qualify for the full main residence exemption:

• The property must have been your main residence for the entire period of ownership
• The dwelling must not have been used to produce income (with some exceptions for minor income-producing use)
• The land must be 2 hectares or less

Partial Main Residence Exemption

If the property was your main residence for part of the ownership period and an investment property for the remainder, you receive a partial exemption. The exempt portion is calculated based on the number of days the property was your main residence divided by the total ownership period.

Example: You owned a property for 10 years. It was your PPOR for 6 years and rented out for 4 years. If the total capital gain was $300,000, the taxable portion would be:

Taxable gain = $300,000 x (4 years / 10 years) = $120,000

The 50% CGT discount would then apply to this amount if held for more than 12 months:

Discounted gain = $120,000 x 50% = $60,000

The 6-Year Absence Rule

One of the most valuable CGT provisions for property investors is the "6-year absence rule" (also called the temporary absence rule). Under this rule, if you move out of your PPOR and rent it out, you can continue to treat it as your main residence for CGT purposes for up to 6 years, even while it is generating rental income.

How the 6-Year Rule Works

1. You move out of your PPOR and start renting it out
2. You do not nominate another property as your main residence during this period
3. For up to 6 years from the date you moved out, the property continues to be treated as your main residence for CGT purposes
4. If you move back into the property before the 6-year period expires, the clock resets. You can move out again and a new 6-year period begins

Key Conditions

• You cannot have two main residences at the same time for CGT purposes. If you buy a new home and treat it as your main residence, you cannot also treat the original property as your main residence under the 6-year rule
• The 6-year rule applies per absence, not per property. If you move out for 3 years, move back for 1 year, then move out again, you get a fresh 6-year period from the second move-out date
• Rental income is still assessable. The 6-year rule does not exempt you from paying income tax on the rent you receive. It only exempts the property from CGT when you eventually sell. You can still claim deductions against the rental income, including depreciation. See our guide on property depreciation schedules for more on claimable deductions
• If you exceed 6 years, the CGT exemption is only partial. The exempt period includes the time you lived in the property plus the first 6 years of absence. The remaining period is taxable on a proportional basis

Strategic Use of the 6-Year Rule

The 6-year absence rule is one of the most powerful tax planning tools available to Australian property owners. Common strategies include:

• Moving from your PPOR to a new home without selling, renting out the original for up to 6 years, and selling CGT-free before the 6-year window closes
• Using the rule to test a move interstate or overseas while keeping the CGT exemption on your Australian property
• Investors who started with a PPOR and converted it to an investment property benefit significantly from this rule

Related Articles

• Property Investment Tax Deductions Australia
• Negative Gearing Explained Australia 2026
• Property Depreciation Schedule Australia
• Land Tax Australia: Every State Explained
• Investment Property vs PPOR Tax Guide

Strategies to Minimise CGT on Investment Property

While you cannot avoid CGT entirely on investment property (unless the 6-year rule or PPOR exemption applies), there are several legitimate strategies to reduce the amount payable.

1. Hold for More Than 12 Months

This is the simplest and most impactful strategy. The 50% CGT discount effectively halves your tax bill on the capital gain. Never sell an investment property just before the 12-month mark if you can avoid it.

2. Maximise Your Cost Base

Ensure you include every legitimate cost in your cost base calculation. Commonly overlooked items include:

• Stamp duty paid on purchase
• Building and pest inspection fees
• Legal and conveyancing costs (both purchase and sale)
• Buyer's agent fees
• Capital improvement costs (keep records of all renovation and improvement expenditure)
• Survey costs
• Loan establishment fees (for the original acquisition, if not already claimed as a deduction)

Tools like PropBuyAI can help you understand your property's current market value relative to its cost base, giving you a clearer picture of the potential capital gain before you commit to selling.

Record keeping is critical. The ATO requires you to keep records related to CGT for at least 5 years after the CGT event. For property, this effectively means keeping records for the entire period of ownership plus 5 years. Keep receipts for all capital improvements, copies of purchase and sale contracts, and records of all acquisition and disposal costs.

3. Time the Sale Strategically

Since the capital gain is added to your assessable income in the year of the CGT event, selling in a year when your other income is lower can result in a lower marginal tax rate being applied to the gain.

Examples of lower-income years:

• A year when you take extended leave or sabbatical
• A year when you transition between jobs
• After retirement, when your salary income has ceased
• A year when you have significant deductions or losses from other investments

4. Offset Capital Gains with Capital Losses

If you have capital losses from other investments (shares, other property, or other CGT assets), these can be offset against your capital gain to reduce the taxable amount. Capital losses must be applied before the 50% discount is calculated.

Example:

| Item | Amount | |---|---| | Capital gain from property sale | $200,000 | | Capital loss from share portfolio | $50,000 | | Net capital gain | $150,000 | | 50% CGT discount | $75,000 | | Taxable capital gain | $75,000 |

5. Consider a Property Trust or Company Structure

Holding investment property in a discretionary trust allows the trustee to distribute capital gains to beneficiaries on the lowest marginal tax rate, which can result in significant tax savings. However, trusts have their own complexities, including stamp duty on transfers, potential loss of the main residence exemption, and land tax surcharges in some states (trusts may not receive the land tax threshold exemption in certain jurisdictions).

Companies do not receive the 50% CGT discount, so they are generally less tax-effective for holding property long-term. However, the flat 25% to 30% company tax rate can be advantageous in some circumstances.

Always seek professional tax advice before choosing or changing your ownership structure. The implications are significant and hard to reverse.

6. Use the Main Residence Exemption Strategically

If you are in a position to live in a property before selling it, the main residence exemption can eliminate CGT entirely. Some investors purchase a property, live in it for 12 months to establish it as their main residence, then move out and rent it for up to 6 years before selling CGT-free under the 6-year absence rule.

This strategy requires genuine intention to use the property as your home. The ATO looks at whether you actually moved in, changed your address on the electoral roll, redirected mail, and moved your belongings. Simply claiming a property as your PPOR without genuinely living there is tax fraud.

CGT and Negative Gearing: How They Interact

Many Australian investors use negative gearing as a strategy to claim tax deductions on investment property losses while banking on capital growth to deliver the real return when they sell. Understanding how CGT interacts with this strategy is important.

While negative gearing reduces your taxable income each year you hold the property (saving you tax at your marginal rate), the capital gain on sale is a separate event. The annual deductions you claimed for interest, depreciation, and other expenses do not increase your CGT cost base. In fact, any deductions you claimed actually reduce your cost base (or are excluded from it), which increases your capital gain.

The net effect: Negative gearing provides annual tax benefits while you hold the property, but you pay CGT on the full gain when you sell (less the 50% discount if held for 12+ months). The strategy works when the after-tax capital growth exceeds the after-tax holding costs over the ownership period.

CGT for Foreign Residents

If you are a foreign resident for tax purposes when you sell an Australian investment property, there are additional considerations:

• No 50% CGT discount. Foreign residents who acquired property after 8 May 2012 are not entitled to the 50% CGT discount. This significantly increases the tax payable
• Foreign resident capital gains withholding. When a foreign resident sells Australian property for $750,000 or more, the buyer must withhold 12.5% of the purchase price and remit it to the ATO. The seller then claims this as a credit in their tax return
• No main residence exemption. Foreign residents who sell a former PPOR are generally not entitled to the main residence exemption for periods of non-residency after 30 June 2020

These rules make it particularly important for Australian expats to plan property sales carefully, ideally while still an Australian resident for tax purposes.

Record Keeping Requirements

The ATO requires comprehensive records for CGT purposes. For investment property, you should retain:

• The original contract of purchase
• Evidence of stamp duty payment
• All conveyancing and legal fee invoices (purchase and sale)
• Building and pest inspection reports and invoices
• Receipts for all capital improvements and renovations
• Records distinguishing between repairs (deductible) and improvements (added to cost base)
• Depreciation schedules
• The contract of sale when you sell
• Agent commission and marketing invoices
• Records of any periods the property was your main residence versus rented

Retention period: Keep all CGT records for at least 5 years after the CGT event. Since you may hold an investment property for 10, 20, or 30+ years, this effectively means keeping records for the entire ownership period plus 5 years.

Common CGT Mistakes to Avoid

1. Forgetting to include all cost base elements. Stamp duty, legal fees, and capital improvements all reduce your capital gain. Missing these increases your tax bill unnecessarily
2. Confusing repairs with improvements. Repairs (fixing something that is broken) are deductible against rental income. Improvements (adding something new or substantially upgrading) are added to the cost base. The distinction matters for both annual deductions and CGT
3. Selling just before the 12-month mark. Missing the 50% CGT discount by a few weeks is an expensive mistake. If you are close to 12 months, delay the sale
4. Not seeking professional advice. CGT on property involves substantial amounts of money and complex rules. The cost of a good tax accountant is negligible compared to the potential savings from proper planning
5. Assuming the 6-year rule applies automatically. You need to meet specific conditions, including not nominating another property as your main residence during the absence period
6. Poor record keeping. Without records of your cost base elements, you may end up paying CGT on a larger gain than necessary because you cannot prove your actual costs

How PropBuyAI Helps

Understanding CGT starts with knowing your property's current market value. PropBuyAI provides AI-powered valuations backed by comparable sales data, so you can estimate the potential capital gain on your investment property before engaging an accountant. Whether you are timing a sale to qualify for the 50% discount or weighing up whether the gain justifies selling now, having an accurate, data-driven valuation is the essential first step. Try PropBuyAI free to get a valuation report on any Australian property.

Key Takeaways

• Capital gains tax on investment property is calculated by subtracting your cost base from the sale price, then adding the gain to your assessable income at your marginal tax rate
• The 50% CGT discount halves the taxable gain for individuals who hold the property for more than 12 months. This is the single most impactful CGT concession
• Your cost base includes more than just the purchase price. Stamp duty, legal fees, and capital improvements all reduce your taxable gain
• The main residence exemption completely exempts your PPOR from CGT. The 6-year absence rule extends this exemption for up to 6 years if you rent out your former home
• Strategic timing of the sale, offsetting gains with losses, and choosing the right ownership structure can all significantly reduce CGT
• Record keeping is essential. Keep all property-related records for the entire ownership period plus 5 years after sale
• Always seek professional tax advice before selling an investment property. The amounts involved are significant, and the rules are complex enough to warrant professional guidance