Capital Gains Tax on Investment Property in Australia: Complete Guide

Capital gains tax is one of the most significant costs in property investment — and one of the most manageable, if you understand the rules. Whether you're planning to sell an investment property, restructure your portfolio approaching retirement, or are simply trying to understand what you'll owe, this guide explains how CGT works on Australian investment property.

What Is Capital Gains Tax on Investment Property?

When you sell an investment property for more than you paid for it, the profit is a capital gain. That gain is added to your taxable income in the year of sale, and you pay income tax on it at your marginal rate.

Capital gain = Sale price − Cost base. The cost base includes your original purchase price, stamp duty, legal costs at purchase, capital improvement costs (not repairs), and certain selling costs including agent commission.

The 50% CGT Discount

If you hold the property for more than 12 months before selling, you're entitled to a 50% discount on the capital gain. This means only half the profit is added to your taxable income. This only applies to grandfathered properties after the 12th May 2026 Australian Budget. This is still pending legislation.

Example: You buy a property for $600,000 and sell it for $900,000 after 3 years. Your capital gain is $300,000. With the 50% discount, only $150,000 is added to your taxable income. At the 47% marginal rate, your CGT liability is $70,500 — not $141,000.

The 12-month rule is one of the most valuable rules in the Australian tax system for property investors. Selling before 12 months means paying tax on the full gain. Almost all property investment strategies are designed around holding for at least 12 months.

CGT Inside an SMSF

Investment property inside a Self-Managed Super Fund is taxed differently. The capital gain is taxed at 10% (not the investor's marginal rate), reflecting the 1/3 reduction applied to the 15% super tax rate on gains from assets held more than 12 months. In pension phase, CGT is 0%.

This makes SMSF property investment particularly powerful for investors with significant super balances who are approaching retirement. Read: Buying Property With SMSF

The Main Residence Exemption

Your primary home (principal place of residence) is generally exempt from CGT. If you sell your home and it was your residence for the entire ownership period, no CGT applies regardless of the profit.

The 6-year rule allows you to rent out your former home for up to 6 years while treating it as your main residence for CGT purposes — provided you don't claim another property as your main residence during that time. This is commonly used by investors who move interstate or overseas.

CGT and the Property Retirement Strategy

For investors building a property portfolio toward retirement, CGT planning is critical. The most common strategies are: (1) Hold rather than sell. Income-producing properties held to retirement generate ongoing rental income without triggering CGT. The goal is to retire with unencumbered properties, not to sell them. (2) Build and simplify. Investors with 4–5 properties sometimes sell 1–2 assets nearing retirement to pay off debt on the remaining portfolio. CGT is a cost of this strategy — factor it into your modelling.

(3) Stagger sales across tax years. If you must sell multiple properties, selling in different financial years spreads the CGT liability and may keep you in a lower marginal bracket each year. (4) Use super contributions. In the year of a large capital gain, maximising concessional super contributions (up to the cap) reduces your taxable income and therefore your effective CGT rate.

For the overall property retirement framework: How to Retire Through Property in Australia

For how many properties you need: How Many Investment Properties Do You Need to Retire in Australia?

Common CGT Mistakes Investors Make

Selling before 12 months. The 50% discount is worth thousands — even tens of thousands — of dollars. Resist any urge to sell a property within 12 months of purchase, regardless of market conditions, unless you have a compelling structural reason.

Forgetting the cost base. Many investors understate their cost base by omitting stamp duty, legal fees, and capital improvement costs, which overstates their taxable gain. Keep all records from purchase to sale.

Not planning for CGT before listing. Once you sign a contract, the CGT liability is largely locked in. Structuring decisions — super contributions, timing across tax years, debt strategy — should be made before you list the property.

Mixing up repairs and capital improvements. Repairs to restore function are deductible in the year incurred against rental income. Capital improvements (renovations, extensions) are added to your cost base and reduce CGT when you sell. The distinction matters significantly.

For the tax benefits of investment property more broadly, including negative gearing and depreciation: Negative Gearing Investment Property Australia: How It Works and Who Benefits

General advice disclaimer: This article is general in nature and does not constitute financial or tax advice. Australian Retirement Office does not hold an Australian Financial Services Licence. Please consult a licensed financial adviser and registered tax agent before making any investment or tax decision.

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Related reading: Negative Gearing Investment Property Australia | How to Retire Through Property | Buying Property With SMSF | Property Investment Strategy