How to Avoid Capital Gains Tax on Investment Property Australia: 7 Legal Strategies

Capital gains tax is the single largest tax bill most property investors will ever face. When you sell an investment property that has grown in value, the profit is taxed at your marginal income tax rate — which for many investors means a bill of $40,000 to $100,000 or more on a well-performed asset.

The good news is that CGT is one of the most manageable taxes in the Australian system. There are seven legitimate, legal strategies that can significantly reduce — and in some cases eliminate — the CGT liability on an investment property sale. None of these require complex structures or aggressive tax planning. They are standard tools that any property investor should understand before selling.

Strategy 1: Hold for More Than 12 Months (The 50% CGT Discount)

This is the most valuable CGT reduction available to individual property investors. If you own the property in your personal name (or through a trust) and hold it for more than 12 months before selling, only 50% of your capital gain is included in your taxable income.

The impact is substantial. A $300,000 capital gain held for more than 12 months becomes a $150,000 assessable gain. At a 37% marginal rate, that halves your tax bill from $111,000 to $55,500. This discount is automatic — no application required — but you must have held the property for strictly more than 12 months.

What to watch: if you sell at 11 months and 3 weeks, you lose the entire 50% discount. The one-year mark is a hard cliff, not a gradual reduction.

Strategy 2: Use the 6-Year Rule on Your Former Home

If you have lived in a property as your principal place of residence and then moved out to rent it, you can treat it as your main residence for CGT purposes for up to 6 years while it is rented out. Selling within that 6-year window can result in zero CGT, even though the property has been an investment for several years.

This is known as the temporary absence rule or the 6-year exemption. The key conditions: you cannot have declared another property as your main residence during the same period, and the clock resets if you move back in. If you move back in for even a day and then leave again, the 6-year clock starts fresh.

This strategy is particularly powerful for people who buy a home, live in it for a year or two, then rent it out and rent elsewhere (or move for work). The property can continue to grow in value, be rented out, and then be sold CGT-free if the sale occurs within 6 years of the original departure.

Strategy 3: Time the Sale for a Low-Income Year

Because CGT is added to your ordinary income, the tax rate that applies to the gain depends on your total income in the year of sale. Selling in a year when your income is lower — a career break, redundancy year, reduced hours, parental leave, early retirement — means the gain is taxed at a lower marginal rate.

Example: If your normal income is $150,000 (marginal rate 45%), selling in a year when you earn $80,000 (marginal rate 34.5%) could reduce your effective CGT rate significantly, even on the same sized gain. Combined with the 50% discount, this can be the difference between paying $55,000 and paying $34,500 on an identical capital gain.

This requires planning — you need to know your income well before settlement date. But for investors approaching retirement or near a career change, timing the sale to a lower-income year is one of the most impactful free strategies available.

Strategy 4: Offset Capital Gains With Capital Losses

Capital losses from other investments — shares, managed funds, other properties, or any other CGT asset sold at a loss — can be applied directly against your capital gain to reduce the taxable amount. Capital losses can also be carried forward from prior years indefinitely.

If you have a poorly-performing share portfolio or other assets sitting at a loss, selling them in the same financial year as your investment property can reduce your net capital gain dollar for dollar. This is entirely legal and is standard tax planning.

Important sequencing: capital losses are applied to gains before the 50% discount is calculated. So a $50,000 capital loss against a $250,000 gross gain reduces it to $200,000 before halving — leaving $100,000 assessable, not $125,000. Apply losses first, then apply the discount.

Strategy 5: Maximise Your Cost Base

The cost base of your investment property is the starting point for the CGT calculation. A higher cost base means a smaller capital gain. Every dollar added to your cost base legitimately reduces your CGT.

Your cost base includes: the original purchase price, stamp duty, legal fees on purchase, buyer's agent fees, title transfer costs, capital improvements (new kitchen, bathroom, structural work, new flooring, extensions), legal fees on sale, and real estate agent commissions. It does not include ongoing maintenance, interest, rates, or property management fees (which are deductible in the year paid as income tax deductions, not added to cost base).

Investors who have held a property for 10-20 years often underestimate their cost base because they have not kept records of capital improvements. A well-maintained renovation history can add $50,000-$100,000 to the cost base and eliminate the same amount of taxable gain.

Strategy 6: Make Super Contributions Before Selling

Concessional (pre-tax) super contributions reduce your assessable income and therefore the effective rate applied to your capital gain. If you are within 12 months of retirement or have unused carry-forward concessional contribution cap, making a large super contribution in the year you sell can meaningfully reduce the tax owed.

For 2025-26, the concessional contribution cap is $30,000. If you have unused cap from prior years (carry-forward contributions are allowed for members with balances below $500,000), you may be able to contribute significantly more. Each dollar contributed reduces your assessable income by one dollar, which reduces the marginal rate applied to your capital gain.

This strategy should be modelled with a financial adviser or accountant, as super contributions are irreversible and the tax benefit depends on your specific income, contribution history, and proximity to preservation age.

Strategy 7: Joint Ownership With a Lower-Income Earner

If you own the property jointly with a spouse or partner who has a lower income, their share of the capital gain is taxed at their lower marginal rate. A 50/50 ownership structure between a high earner ($150,000+) and a lower earner ($60,000) can halve the effective tax rate on half the gain.

This strategy is most effective when ownership is structured correctly from the start — at purchase. Transferring ownership before a sale to take advantage of a lower marginal rate is generally not effective, as the transfer itself may trigger a CGT event and stamp duty.

The proportional benefit of joint ownership is straightforward: each owner reports their proportional share of the gain and pays tax at their own marginal rate. The couple's combined bill is typically significantly lower than if the high-income earner owned 100%.

What Doesn't Work: Common CGT Mistakes

Selling just before the 12-month mark to access liquidity: you lose the entire 50% discount. The cost is almost always greater than the benefit of early access to funds.

Assuming the 6-year rule applies when you've already declared another main residence: the exemption requires continuous absence with no other declared main residence.

Ignoring carry-forward capital losses: losses from prior years can be applied against this year's gain but must be tracked. Your accountant should check your tax return history before you sell.

Book a Strategy Call Before You Sell

The strategies above can save tens of thousands of dollars, but the right combination depends on your income, asset profile, timing, and retirement plans. The worst time to plan CGT minimisation is after you've already sold.

Book a free 20-minute strategy call before you sell → https://www.ausretirementoffice.com.au/book

One strategy not covered in this guide is holding property inside an SMSF — where the effective CGT rate is 10% in accumulation phase, and zero in pension phase. After the 2026 budget changes, this gap has widened significantly. See: Your SMSF pays 10% CGT. You pay 30%. Here's what smart investors are doing about it.

Related reading: Capital Gains Tax on Investment Property Australia | How to Build a Property Portfolio in Australia | Property Investment Strategy Australia | Negative Gearing Australia