Australian Capital Gains Tax Guide 2026: The 12-Month 50% CGT Discount

When I was building the tax tools on ProCalc, one of the most requested features from our Australian user base was a calculator to model Capital Gains Tax (CGT). Whether selling shares, crypto, or investment property, understanding how the ATO calculates capital gains is crucial.

In Australia, CGT is not a separate stand-alone tax rate. Instead, your net taxable capital gain is added directly to your assessable income for the financial year and taxed at your personal marginal tax rate. This makes the 12-month 50% CGT discount one of the most powerful wealth preservation tools available to individuals. I built the Australian CGT Calculator to help users quickly estimate their tax liability and model the difference between selling at 11 months versus 12 months.

Use the Australian CGT Discount Calculator →

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1. How the 12-Month 50% CGT Discount Works

To encourage long-term investment, the Australian Taxation Office (ATO) grants a 50% CGT discount to Australian individuals and eligible trusts who hold an asset for at least 12 months before selling.

+-------------------------------------------------------------------+
|               ATO 12-MONTH 50% CGT DISCOUNT MECHANICS            |
+-------------------------------------------------------------------+
| HELD UNDER 12 MONTHS : 100% of Capital Gain added to Taxable Income|
| HELD 12+ MONTHS      : 50% of Capital Gain added to Taxable Income |
| TAX RATE APPLIED     : Individual Marginal Tax Rate (16% to 45%)  |
+-------------------------------------------------------------------+

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2. ATO Entity Entity Discount Comparison

The 50% CGT discount eligibility depends on the legal entity structure that owns the asset:

Entity Type	12+ Month CGT Discount Rate	Notes & ATO Rules
Individual Taxpayers	50% Discount	Halves taxable gain for Australian tax residents
Complying Super Funds	33.3% Discount	Reduces effective super CGT tax rate from 15% to 10%
Discretionary Trusts	50% Discount	Discount flows through to individual beneficiaries
Companies (Pty Ltd)	0% Discount (No Discount)	Taxed at flat 25% or 30% on 100% of capital gain

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Comprehensive CGT Calculation Matrix ($20,000 Gain)

The table below illustrates total CGT owed for an individual earning $90,000 base salary (30% marginal tax rate + 2.0% Medicare = 32% effective rate) making a $20,000 capital gain:

Holding Period	Gross Capital Gain	CGT Discount	Taxable Gain Added	ATO Tax Rate	CGT Tax Owed ($)	Net Profit After Tax
6 Months (Short Term)	$20,000	0%	$20,000	32.0%	$6,400	$13,600
14 Months (Long Term)	$20,000	50%	$10,000	32.0%	$3,200	$16,800
14 Months + $5k Loss	$20,000 - $5k = $15k	50%	$7,500	32.0%	$2,400	$17,600

Holding the asset for more than 12 months saved $3,200 in tax on a single transaction!

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Step-by-Step Worked Calculation: ATO Capital Loss Offset Order

A critical rule under ATO tax law is that prior capital losses must be offset against gross capital gains BEFORE applying the 50% discount:

1. Gross Capital Gain: Sold investment property with a $100,000 gain (held for 3 years).
2. Carried-Forward Capital Loss: Outstanding $20,000 share market loss from prior year.
3. Step 1 - Subtract Losses: $100,000 Gross Gain - $20,000 Capital Loss = $80,000 Remaining Gain.
4. Step 2 - Apply 50% Discount: 50% × $80,000 = $40,000 Taxable Capital Gain.
5. Step 3 - Add to Income: Add $40,000 to annual salary on your ATO tax return.

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Frequently Asked Questions (FAQ)

How is the 12-month holding period calculated?

The 12-month period is calculated from the day after you acquire the asset to the day you sign the contract to sell it (contract date, not settlement date).

Do companies get the 50% CGT discount?

No. Companies (Pty Ltd entities) do not qualify for the 50% CGT discount; they pay flat company tax (25% or 30%) on 100% of capital gains.

Can capital losses offset regular salary income?

No. Capital losses can only be used to offset capital gains. Unused capital losses are carried forward indefinitely to offset future capital gains.

Is my primary residence subject to Capital Gains Tax?

No! Your principal place of residence (the home you live in) is 100% exempt from CGT under the ATO Main Residence Exemption.

What expenses reduce my capital gain cost base?

Brokerage fees, legal conveyancing costs, stamp duty, advertisement fees, and asset improvement costs are added to your asset's Cost Base, reducing gross taxable profit.

How are cryptocurrency gains taxed in Australia?

The ATO treats cryptocurrency (Bitcoin, Ethereum, NFTs) as capital assets. Selling, trading crypto-for-crypto, or spending crypto triggers a CGT event eligible for the 50% discount if held over 12 months.

What is the CGT small business concession?

Small business owners (turnover under $10 million) can access four additional CGT concessions when selling business assets: the 15-year exemption (full exemption if held 15+ years), 50% active asset reduction (on top of the standard discount), retirement exemption ($500,000 lifetime), and rollover relief. These stack on top of the standard 50% discount.

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Asset-Type CGT Comparison Table

Asset Type	12-Month Discount	Main Residence Exemption	Typical CGT Rate (37% bracket)
Shares / ETFs	✅ 50% discount	❌ No	18.5% (with discount)
Cryptocurrency	✅ 50% discount	❌ No	18.5% (with discount)
Investment property	✅ 50% discount	❌ No	18.5% (with discount)
Principal residence	✅ Fully exempt	✅ Yes (100%)	0%
Collectibles / art	✅ 50% discount	❌ No	18.5% (with discount)
Cars / personal assets	❌ Exempt (depreciating)	❌ Not applicable	0%
Short-term assets (less than 12 months)	❌ No discount	❌ No	37% full marginal rate

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Real-World Case Studies

Case Study 1: The ETF Investor Who Sold 3 Days Too Early

Profile: 34-year-old in Sydney, bought ETF for $42,000, sold for $68,000 — holding period: 11 months and 28 days

• Capital gain: $26,000
• Discount applied: 0% (held under 12 months)
• Taxable gain added to income: $26,000
• Tax at 37% bracket: $9,620

What if he had waited 3 more days (to pass 12 months)?

• Discount applied: 50%
• Taxable gain: $13,000
• Tax: $4,810
• Tax saved by waiting 3 days: $4,810

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Case Study 2: Investment Property Sale With Carried-Forward Losses

Profile: Melbourne investor sold $780,000 investment property (bought for $490,000), 5-year hold, plus $35,000 carried forward share losses

1. Gross gain: $780,000 − $490,000 − $22,000 (costs) = $268,000
2. Apply carried-forward losses: $268,000 − $35,000 = $233,000
3. Apply 50% CGT discount: $116,500 taxable
4. Add to $95,000 salary = $211,500 total income
5. Tax on $211,500 = ~$72,000 total ATO bill

Without the carried-forward losses: Taxable gain would have been $134,000 — costing approximately $12,950 extra in tax.

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Case Study 3: The Crypto-to-Crypto Trap

Profile: Investor swapped 2 ETH for SOL in March 2024 (under 12-month hold of ETH), ETH purchased at $2,800 AUD each, ETH value at swap: $6,400 AUD each

• CGT event triggered at time of swap
• Gain per ETH: $6,400 − $2,800 = $3,600
• Total gain: 2 × $3,600 = $7,200
• No 50% discount (held ETH only 8 months)
• Tax at 37% bracket: $2,664

The investor didn't realise crypto-to-crypto swaps are CGT events — a common mistake. The ATO classifies every disposal (including trading one crypto for another) as a CGT event requiring reporting.

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CGT Timing Strategies

Strategy	How It Works	Potential Saving
Hold for 12 months	Wait until 12-month anniversary before selling	Halves the taxable gain
Harvest capital losses in June	Sell underperforming assets before June 30 to offset gains	Reduces net taxable gain dollar-for-dollar
Income bunching	Sell large assets in a lower-income year (e.g., career break, parental leave)	Lower marginal rate reduces CGT payable
Spread sales across financial years	Split a large asset sale across June/July to spread gain across two tax years	Keeps income in lower brackets each year
Donate assets to charity (DGR)	Donate listed shares/property — no CGT event, ATO deduction at market value	Avoids CGT entirely on appreciated donations

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Edge Cases

Situation	CGT Treatment
Partial sale of property	CGT applies only on the proportion sold
Inherited property	Inherited from deceased estate: acquirer takes deceased's cost base; 50% discount applies if deceased held 12+ months
Gifting property (below market value)	Deemed disposal at market value — CGT calculated as if sold at current market price
Main residence used for business (home office)	Partial CGT applies proportional to the floor area and time used for income purposes
Foreign residents selling Australian property	Not entitled to 50% CGT discount; no access to main residence exemption — full gain taxed

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💡 Disclaimer: CGT rules are complex and vary by asset type and personal circumstances. This guide is for educational purposes only. Consult a registered tax agent for advice.

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