Ato Capital Gains Tax Calculator

Estimate your Australian capital gains tax on shares, property, crypto, managed funds, and other CGT assets. This calculator uses a practical estimate based on current Australian resident and non-resident individual tax brackets, common CGT discount rules, and your cost base inputs.

CGT Calculator

Quick Summary

How this estimate works:

This tool calculates your capital gain or capital loss from sale proceeds minus the cost base, applies your ownership share, offsets eligible capital losses, checks for the 12-month CGT discount, and then estimates the additional tax generated by the net capital gain.

Resident individual discount 50%

Super fund discount 33.33%

Company discount 0%

Medicare levy used 2%

Expert Guide to Using an ATO Capital Gains Tax Calculator

An ATO capital gains tax calculator helps you estimate how much tax may be payable when you dispose of a capital gains tax asset in Australia. That can include shares, exchange-traded funds, investment properties, crypto assets, units in managed funds, collectables, and certain business assets. In practice, capital gains tax is not a separate tax rate applied on its own. Instead, your net capital gain is generally included in your assessable income and taxed at your marginal rate unless a specific concession or exemption applies.

That distinction is important because many people search for an “ATO CGT calculator” expecting one flat percentage. Australian capital gains tax does not usually work that way. The final amount can vary based on your cost base, how long you held the asset, your ownership percentage, your residency status, whether you are an individual, company, or complying super fund, and whether you have current year or carried-forward capital losses to offset gains.

This calculator is designed as a practical estimator. It gives you a fast, decision-useful view of your likely taxable capital gain and a reasonable estimate of the incremental tax that gain may create. It is especially useful when you are comparing whether to sell before or after 12 months, planning year-end disposals, or deciding how much of a sale reserve you should set aside for tax.

What the calculator includes

• Sale proceeds from disposal of the asset.
• Original purchase price.
• Purchase and selling costs that may form part of the cost base.
• Other cost base adjustments such as eligible capital improvements.
• Your ownership percentage if the asset was jointly owned.
• Capital losses available to offset gains.
• A 12-month discount estimate where relevant.
• Your other taxable income to estimate the marginal tax effect.

What is a capital gain?

A capital gain broadly arises when your capital proceeds from selling or disposing of an asset are more than the asset’s cost base. The cost base may include far more than the purchase price alone. Depending on the asset and circumstances, you may be able to include acquisition costs, incidental costs, certain non-deducted ownership costs, and capital expenditure incurred to increase or preserve the asset’s value.

For many investors, the biggest error is underestimating the cost base. Brokerage on listed securities, legal fees on property transactions, transfer charges, and some improvement costs can materially reduce the taxable gain. If your records are incomplete, your estimate can be overstated. Good documentation matters because every dollar added to the cost base may reduce the gain and therefore the tax payable.

How the 12-month CGT discount works

One of the most powerful features of the Australian CGT system is the general discount method. In broad terms, individuals who hold a CGT asset for at least 12 months before the CGT event may reduce the capital gain by 50% after first applying any capital losses. Complying super funds may generally apply a one-third discount. Companies do not receive the CGT discount.

Timing therefore matters. If you are close to the 12-month ownership threshold, delaying the sale may have a major tax effect. For example, a resident individual with a $40,000 capital gain may only include $20,000 in assessable income if the discount applies. For someone already in a higher tax bracket, that can produce a meaningful difference in final tax.

Important: The calculator provides a useful estimate, but actual ATO outcomes can differ if special rules apply, such as main residence exemptions, small business CGT concessions, partial non-residency periods, inherited assets, rollover relief, or detailed managed fund tax statement adjustments.

Capital losses come first

Capital losses are generally applied before the CGT discount. That sequence can affect your result. If you have carried-forward capital losses from prior years, they usually offset current capital gains before any discount percentage is applied. You cannot generally deduct a net capital loss from salary or business income. Instead, capital losses are quarantined and carried forward to offset future capital gains, subject to the rules that apply to your circumstances.

This means taxpayers with old losses may pay much less tax than expected on a current sale. If you sold speculative investments or crypto assets in prior years at a loss and properly recorded those losses, they may be valuable tax assets later.

Australian Individual Income Tax Rates Used in Many CGT Estimates

Because CGT is generally added to taxable income, a calculator needs tax bracket data. The table below sets out commonly used resident individual rates for estimating the tax impact of a net capital gain. Actual ATO liabilities may also be affected by offsets, levies, and personal circumstances.

Resident taxable income	Marginal tax treatment	Common estimate used in calculators
$0 to $18,200	Nil	0%
$18,201 to $45,000	16 cents per $1 over $18,200	16%
$45,001 to $135,000	30 cents per $1 over $45,000	30%
$135,001 to $190,000	37 cents per $1 over $135,000	37%
Over $190,000	45 cents per $1 over $190,000	45%

For Australian residents, many estimates also factor in the 2% Medicare levy. That means your effective extra tax on a discounted gain may be higher than the headline income tax bracket alone. For non-residents, the tax-free threshold and Medicare levy treatment differ, so a separate approach is usually required.

Resident vs Non-Resident CGT Estimation

Residency status can materially change your tax position. For estimation purposes, calculators often apply non-resident marginal rates without a tax-free threshold. In addition, some CGT discount rules have changed over time for foreign or temporary residency situations, and Australian real property may also trigger different compliance considerations at sale. This is why residency is one of the most important calculator inputs.

Factor	Australian resident individual	Non-resident individual estimate
Tax-free threshold	Yes, typically from $0 to $18,200	No general tax-free threshold
Medicare levy in simple estimates	Often included at 2%	Usually not included
General CGT discount in simple calculators	Usually available if conditions are met	May be limited depending on dates and asset type
Why it matters	Can reduce effective tax significantly	Often raises the estimated tax result

How to use the calculator correctly

1. Enter the purchase price you originally paid for the asset.
2. Add purchase costs such as brokerage, legal fees, transfer fees, or stamp duty where relevant and eligible.
3. Enter the sale price and any direct selling costs.
4. Include capital improvements or other cost base adjustments if they are eligible and not otherwise deducted.
5. Enter any current or carried-forward capital losses.
6. Select the correct taxpayer type: individual, company, or complying super fund.
7. Choose your residency status and ownership share.
8. Enter your expected other taxable income for the year to estimate your marginal tax impact.
9. Check the holding period. If you held the asset for at least 12 months, the calculator may apply a discount where available.

Common assets people calculate CGT on

• Shares and ETFs: Often straightforward because broker statements help verify purchase and sale costs.
• Investment property: More complex because the cost base can include legal fees, stamp duty, buyers agent fees, and certain improvement costs.
• Crypto assets: Often difficult because records may be spread across platforms and swaps can trigger CGT events.
• Managed funds: Annual tax statements can include cost base adjustments that should not be ignored.
• Business assets: May qualify for special small business CGT concessions, making generic calculators less precise.

Why the result is only an estimate

No online CGT calculator can capture every rule and exception. For example, the main residence exemption can fully or partly eliminate CGT on a property that was your home. Inherited assets can have special acquisition date and cost base rules. Employee share schemes, demergers, wash sales, asset rollovers, and managed fund adjustments can all change the final tax outcome. A calculator is therefore best used as a planning tool rather than a substitute for a lodged tax return or tailored professional advice.

The estimate can still be extremely valuable. It can help you answer practical questions such as:

• Should I sell before 30 June or after?
• Would waiting until the 12-month mark lower my tax?
• How much cash should I reserve from settlement proceeds?
• Do my prior capital losses offset most of the gain?
• Would selling only part of a parcel this year reduce my tax pressure?

Record-keeping tips

Good CGT outcomes often begin with record-keeping rather than tax rates. Keep contracts, broker confirmations, settlement statements, legal invoices, records of capital improvements, and any distribution tax statements from funds. For crypto, preserve wallet reports, exchange exports, and transaction IDs. If you cannot prove an element of your cost base, you may not be able to claim it later. For long-held assets, that can be expensive.

Planning strategies investors often consider

• Deferring a sale until the 12-month discount applies.
• Realising capital losses in the same year to offset gains.
• Staggering disposals across financial years to avoid bunching income.
• Reviewing joint ownership structures before making new investments.
• Checking whether a company or super structure changes the after-tax outcome.

These strategies must be considered carefully. Tax should not be the sole reason for an investment decision, but understanding the tax drag can materially improve net returns. A well-built ATO capital gains tax calculator helps you compare scenarios quickly and make decisions with clearer numbers.

Authoritative sources

For official guidance and current rules, review these authoritative resources:

• Australian Taxation Office: Capital gains tax
• Australian Taxation Office: Tax rates for Australian residents
• ASIC Moneysmart: Capital gains tax overview

Disclaimer: This calculator and guide are for educational and estimation purposes only. They do not constitute tax, financial, or legal advice. Always verify your position against current ATO guidance and seek professional advice for complex scenarios.