Disclaimer: This calculator provides estimates only and should not be considered financial or tax advice. CGT calculations use the incremental marginal rate method and FY2025-26 tax rates. Always consult a qualified tax professional before selling shares. This tool does not constitute advice from the Australian Taxation Office. Evercend Pty Limited does not hold an Australian Financial Services Licence.
CGT on shares partnership calculator inputs and results
Share sale details
Used to auto-detect 12-month CGT discount eligibility.
Owner 1 details
Owner 2 details
Enter share sale details to begin
Enter the number of shares, purchase and sale prices, and each owner's income to calculate CGT individually.
CGT on shares held by two people
This calculator estimates the capital gains tax on a parcel of shares owned by two people together, and splits the result between them. It works out the gain on the whole parcel, divides it by each owner's ownership share, then applies the 50% CGT discount and each owner's own marginal tax rate separately. Because the two owners can have different incomes, the same parcel can produce a different tax result for each of them.
How to use this calculator
Enter the purchase details
Enter the purchase price per share and the number of shares in the parcel.
Enter the sale price
Enter the sale price per share.
Enter the brokerage
Enter the brokerage paid on the buy and on the sell.
Enter the dates
Enter the purchase date and the sale date so the 12 month discount test can be checked.
Set the ownership split
Set each owner's ownership share. Owners who hold as joint tenants have equal shares. Owners who hold as tenants in common can hold unequal shares.
Enter each owner's income
Enter each owner's other taxable income for the year, and their HELP or HECS position if the tool asks for it.
Read the results
The calculator splits the net gain by ownership share and estimates the tax for each owner.
How this calculator works
A share held by two people is still a single CGT asset, and each co-owner holds an interest in it. The Australian Taxation Office treats an interest in a CGT asset as a CGT asset in its own right, so a jointly owned share can give rise to a capital gain for each owner. The gain on the parcel is worked out once. The capital proceeds are the sale value less the brokerage paid on the sell. The cost base is the purchase value plus the brokerage paid on the buy. The capital gain is the capital proceeds less the cost base. The gain is then split between the owners according to their legal ownership interest. Joint tenants hold equal shares, so the gain is split equally. Tenants in common hold the shares in their stated proportions, so the gain is split in those proportions. Each owner applies their own capital losses to their share of the gain before the 50% discount, not after. If the parcel was held for at least 12 months, each owner then reduces their remaining share of the gain by the 50% discount. The 12 month test excludes the day of acquisition and the day of the CGT event, and the CGT event is the contract or trade date, not settlement. Each owner's discounted share of the gain is added to that owner's other taxable income for the year and taxed at that owner's marginal rate, plus the Medicare levy. A net capital gain is part of taxable income, so it also forms part of the income used to work out any compulsory HELP or HECS repayment.
Assumptions used
Assumptions used: both owners are Australian resident individuals; the parcel was acquired on a single date and sold in a single CGT event; the 50% discount applies where the parcel was held at least 12 months; capital losses are applied before the discount; each owner's discounted share is taxed at the FY2025-26 individual rates plus the Medicare levy. The estimate does not include the Medicare levy surcharge, tax offsets, or prior year carried forward losses unless you enter them. Brokerage on the buy is added to the cost base and brokerage on the sell reduces the capital proceeds.
Worked example
Two people own a parcel of shares as tenants in common, with a 60% and 40% split. The parcel is held for more than 12 months and the net capital gain on the whole parcel is 20,000 dollars.
The 60% owner takes 12,000 dollars of the gain. After the 50% discount their taxable gain is 6,000 dollars, which is added to their other income and taxed at their marginal rate.
The 40% owner takes 8,000 dollars of the gain. After the 50% discount their taxable gain is 4,000 dollars, which is added to their other income and taxed at their marginal rate.
Because each owner has different other income, the tax on each share of the gain can differ. The calculator uses the incomes you enter to produce each owner's figure.
What changes each owner's share of the gain
Several things change how the capital gain is split and taxed across each owner. The main ones are:
Ownership split
The ownership split. Joint tenants are equal. Tenants in common can be unequal, and the split follows the legal interest.
12-month holding period
Whether the parcel was held for at least 12 months, which decides if the 50% discount applies to each owner.
Each owner's income
Each owner's other taxable income, which sets the marginal rate that applies to their share of the gain.
Brokerage
Brokerage on the buy and on the sell, which change the cost base and the capital proceeds.
Capital losses
Any capital losses an owner has, which are applied to their share before the discount.
HELP or HECS
A HELP or HECS debt, since a gain lifts the income used to work out a compulsory repayment.
Residency
Residency. A non-resident owner does not get the 50% discount, so co-owners with different residency can be taxed differently on the same parcel.
Rates and assumptions used
| Item | Value used | Source |
|---|---|---|
| 50% CGT discount | For Australian resident individuals who hold an asset at least 12 months. Only half the remaining gain is taxed. | ATO, How to calculate your CGT |
| 12-month holding test | Excludes the day of acquisition and the day of the CGT event. The CGT event is the contract or trade date. | ATO, CGT discount |
| Capital losses | Applied to the gain before the 50% discount. | ATO, Using capital losses to reduce capital gains |
| Co-owner gain split | By legal ownership interest. Joint tenants hold equal shares. Tenants in common hold their stated proportions. | ATO, Acquiring CGT assets |
| Joint ownership income split | Income and gains are assumed to be split equally unless the owners hold unequal interests. | ATO, Investment income |
| Interest in jointly owned share | Is itself a CGT asset; its sale can give rise to a capital gain for each owner. | ATO ID 2004/378 |
| CGT reform from 1 July 2027 | The 50% discount for individuals, trusts and partnerships is replaced by cost base indexation with a 30% minimum tax rate. Assented 26 June 2026. | ATO, reforming negative gearing and capital gains tax |
Figures checked against the sources above on 10 August 2026.
Frequently asked questions
For CGT the ATO treats each co-owner as holding their own interest in the asset, and says a partnership does not own the asset. This tool covers two people who co-own a parcel of shares and are each assessed on their own share of the gain.
Related calculators and guides
Sources
- •ATO, How to calculate your CGT
- •ATO, CGT discount
- •ATO, Using capital losses to reduce capital gains
- •ATO, Acquiring CGT assets
- •ATO, Investment income
- •ATO ID 2004/378, joint ownership of a share
- •ATO, reforming negative gearing and capital gains tax
Content reviewed and figures checked against the sources above on 10 August 2026.