Capital Gains Tax on Sydney Property: What Investors Pay (2026)

What CGT actually is for property

Capital gains tax is a Commonwealth tax administered by the Australian Taxation Office under Part 3-1 of the Income Tax Assessment Act 1997 (Cth). The most important thing to understand: CGT is not a separate tax with its own rate. The capital gain (or loss) is calculated when a CGT event happens — usually the disposal of the property — and the net gain is added to your assessable income for that financial year, then taxed at your marginal income tax rate. So a $200,000 gain doesn't trigger a 30% or 45% CGT bill in isolation — it adds $200,000 to the income you report, and your accountant calculates the tax on the new total. For Sydney property investors on the top marginal rate, the effective tax on a gain can sit around 47% (including Medicare levy) before discounts; with the 50% discount applied, that drops closer to 23.5%.

CGT events for property

Part 3-1 of the ITAA 1997 lists dozens of CGT events, but only a handful matter for residential property. Event A1 is the disposal of an asset — selling your investment property to a buyer — and it's by far the most common. Event C2 covers compulsory acquisition by a government authority (think a road widening that takes part of your land). Event F1 covers the granting of a long-term lease, and event G1 covers a capital return from a unit trust holding property. The timing of event A1 matters more than most investors realise: the CGT event happens on the contract date, not the settlement date. A property sold under contract on 28 June 2026 with settlement on 15 August 2026 is a 2025-26 financial year gain, not a 2026-27 gain. That subtle distinction can shift hundreds of thousands of dollars between tax years and is the reason late-June settlements are scrutinised closely.

• Event A1: disposal under contract (the standard sale) — timing is contract date
• Event C2: compulsory acquisition by a government authority
• Event F1: granting a lease (rare for residential — relevant to commercial)
• Event G1: capital return from a property unit trust
• Contract date vs settlement date is the most common end-of-financial-year planning trap

Calculating the gain

The capital gain is the disposal proceeds minus the cost base. The proceeds are the contract price less the costs of sale (agent commission, marketing, conveyancing on the disposal). The cost base is broader than just what you paid: it includes the original purchase price, stamp duty paid at acquisition, conveyancing and legal fees on the purchase, agent commission and marketing on the eventual disposal, and the cost of any capital improvements you made during ownership (a new kitchen, an extension, a granny flat — but not ongoing repairs and maintenance, which are deducted as expenses against rental income instead). An important catch: any Division 43 capital works deductions you claimed against rental income over the years reduce your cost base when you sell. So if you claimed $80,000 of capital works depreciation over a decade, your cost base drops by $80,000 and your taxable gain increases by the same amount. This is the reason poor record-keeping during ownership becomes very expensive at disposal.

The main residence exemption and the 6-year absence rule

The principal place of residence (PPR) exemption is the single largest CGT concession in Australian tax law. Under section 118-110 of the ITAA 1997, the family home is fully exempt from CGT — your $4m owner-occupied house in Mosman attracts zero CGT when you sell, provided it was your main residence for the entire ownership period. The six-year absence rule under section 118-145 extends that further: if you move out and rent the property to tenants, you can continue treating it as your main residence for up to six years, provided you don't nominate another property as your PPR during that time. Move back in before six years is up, the clock resets, and you can repeat the six-year absence indefinitely. This is the rule that lets many Sydney owners turn a former home into an investment, hold it tax-effectively for years, and sell with the gain still partially or fully exempt. Use it deliberately — the wording of section 118-145 is strict.

The 50% individual discount

Section 115-25 of the ITAA 1997 grants a 50% capital gains discount to individuals who hold the asset for more than 12 months before the CGT event. The discount halves the gain before it's added to assessable income. So a $300,000 gain on an asset held 18 months becomes $150,000 added to your taxable income — at the top marginal rate of around 47% that's about $70,500 of tax, versus $141,000 without the discount. The 12-month clock runs from the day after acquisition (the contract date again, not settlement) to the day of the CGT event. Trusts also access a 50% discount under section 115-100, with the discount typically flowing through to the beneficiary alongside the underlying gain. Companies do not get the discount — they pay the corporate tax rate on the full undiscounted gain. The discount is the single biggest reason individuals and trusts dominate residential property holdings in Australia.

SMSF and company CGT

Ownership structure changes the CGT outcome significantly. A self-managed super fund (SMSF) holding direct residential property pays CGT at 15% in accumulation phase, dropping to an effective 10% on assets held longer than 12 months (the SMSF discount is one-third, not 50%). Once the fund moves into pension phase and the property is supporting a retirement income stream, the CGT rate on disposal can drop to 0%. That's the structural reason many self-funded retirees buy property inside super and hold it until pension phase before selling. A company pays the corporate tax rate on the full undiscounted gain — 30% for standard companies, 25% for eligible small business entities — with no discount available. Discretionary trusts pay no tax themselves but flow gains through to beneficiaries, who can apply the 50% individual discount on their share. The structural decision sits with a qualified accountant and a financial planner before you buy, not after.

• Individual: 50% discount on gains held >12 months, then added to assessable income at marginal rates
• Discretionary trust: 50% discount flows through to beneficiaries, taxed at their marginal rates
• SMSF accumulation phase: 15% (or effective 10% if held >12 months with the one-third discount)
• SMSF pension phase: 0% CGT on the disposal
• Company: 30% (or 25% for eligible small business) on the full undiscounted gain — no discount

The six-month overlap rule when moving home

Section 118-140 of the ITAA 1997 covers the awkward window between buying a new principal place of residence and selling the old one. The default rule is that you can only have one main residence at a time for CGT purposes. The six-month overlap rule lets you treat both properties as your main residence for up to six months — provided the old property was your main residence for at least three months in the 12 months immediately before the disposal, and was not rented out during the overlap period. The practical effect is that Sydney owners upgrading homes can settle the new property, move in, then list and sell the old property without losing any of the main residence exemption on either, as long as the sale completes within six months. Take longer than six months and the partial exemption rules in section 118-185 start applying to the old property for the period after the overlap window expires.

Foreign-resident CGT changes

Two significant reforms have reshaped CGT for non-resident property owners. First, foreign residents are no longer entitled to the main residence exemption on disposal of Australian property — a rule that took effect in 2019 and applies to properties owned by individuals who were non-residents at the time of the CGT event. An Australian who bought a Sydney home, moved overseas for work, and later sold while still a non-resident pays CGT on the full gain across the entire ownership period, including the years they lived in it. Returning to Australian residence before the CGT event restores access to the exemption. Second, the foreign-resident CGT withholding regime requires the buyer to withhold a percentage of the sale proceeds at settlement and remit it to the ATO unless the seller produces a clearance certificate. The withholding rate is 15% of the sale proceeds as of 2025, applied to all dispositions above a low threshold. Sellers who are Australian residents apply for a free ATO clearance certificate before settlement to avoid the withholding. Conveyancers handle the certificate paperwork as standard.

Reducing CGT legally

Several legitimate strategies cut the CGT bill on a Sydney property disposal. The most powerful is structural — choosing the right ownership entity before purchase, so the eventual disposal lands in a low-tax structure. Beyond that, holding the asset for more than 12 months unlocks the 50% individual or trust discount. Keeping meticulous records of every capital improvement during ownership (renovations, extensions, structural additions) inflates the cost base and shrinks the taxable gain. Discretionary trusts can split a gain across multiple beneficiaries to use lower marginal rates. Deferring a disposal across financial years — exchanging in July rather than late June — can shift a gain into a year of lower personal income, such as a planned career break or retirement. Capital losses from other assets (shares that have fallen, an unprofitable second investment property) offset capital gains in the same year, reducing the net gain assessed.

• Hold individual or trust-owned assets for >12 months to access the 50% discount
• Keep capital improvement receipts to lift the cost base
• Use discretionary trust beneficiary distributions to access lower marginal rates
• Exchange across financial years to land the gain in a lower-income year
• Offset capital losses from other assets against the property gain in the same year
• Plan structure with a financial planner and accountant before purchase, not at disposal

Common mistakes that cost real money

A handful of errors show up repeatedly on Sydney CGT disposals and cost investors meaningful tax. Confusing contract date with settlement date — using the wrong date for the 12-month holding period test or the year of assessment — is the most common. Forgetting to add Division 43 capital works deductions back to the cost base (technically, the reduction to the cost base) so the apparent gain looks smaller than it really is, leading to an ATO amendment with penalty interest later. Missing the section 118-185 partial PPR formula when the property was used as your main residence for part of the ownership period and rented for the rest — many investors assume it's all-or-nothing exempt, when in practice the days-of-PPR-use over total-days-of-ownership ratio is applied to the gain. Double-claiming an improvement as both a capital cost (added to the cost base) and as a maintenance deduction (claimed annually against rental income) is another flag the ATO catches.

• Using settlement date instead of contract date for the CGT event and the 12-month test
• Forgetting that Division 43 deductions claimed during ownership reduce the cost base at sale
• Missing the partial PPR formula under section 118-200 for properties used as both home and rental
• Double-claiming capital improvements as both cost base additions and annual maintenance deductions
• Not keeping receipts for improvements made years before the eventual sale
• Assuming a foreign-resident period is exempt when it isn't (post-2019 reform)

The professional team you need

Sydney property CGT planning is a team sport. A qualified accountant runs the actual CGT calculation at disposal and prepares the return — they need every cost base receipt, every contract, every settlement statement, and every depreciation schedule across the ownership period. A financial planner adds the most value before acquisition, because the structural decisions (sole vs joint ownership, individual vs trust vs SMSF, PPR vs investment from day one) drive the eventual CGT outcome more than any move available at sale. Browse our Sydney financial planners at /services/financial-planners and use the directory to find a planner who works alongside accountants on property structures. A tax depreciation specialist's schedule provides the construction-cost evidence used to substantiate the cost base — especially valuable on older properties where original construction costs are hard to prove. Find specialists at /services/tax-depreciation. A conveyancer keeps PEXA settlement records and foreign-resident clearance certificates aligned with ATO requirements at disposal.

Next step: plan structure before you sell

The single highest-leverage CGT move is structural, and it has to happen before the disposal — ideally before the original purchase. By the time the contract is signed to sell, almost every meaningful planning lever has already locked in. Book a conversation with a Sydney financial planner and a qualified accountant before you list, and certainly before you sign a sale contract. If you're still in the holding phase, commission a tax depreciation schedule now so the construction-cost evidence is on file for the eventual disposal. Browse our Sydney financial planners directory at /services/financial-planners and tax depreciation specialists at /services/tax-depreciation, and read the related guides below for the tax and structural questions that intersect with CGT planning.

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