The key capital gains tax terms for ASX investors include capital gain, capital loss, cost base, capital proceeds, acquisition date, holding period, CGT discount method, CGT event, parcel, and lot selection. Understanding these concepts helps you calculate gains and losses, track each investment parcel, assess discount eligibility, and plan tax-aware trades.
The Australian Taxation Office (ATO) defines CGT and related concepts in Appendix 4 Definitions, which provides the authoritative framework for understanding how capital gains are calculated and taxed in Australia. Understanding these terms will empower you to optimize your investment strategy and work more effectively with your accountant or tax adviser.
A
Assessable Income and Net Capital Gain
Your net capital gain is the figure that actually enters your assessable income. You work it out by reducing your capital gains by any capital losses for the year, then by any carried-forward losses, and only then applying the 50% discount to what remains. The order matters: applying the discount first overstates the benefit of a loss by roughly double. When you sell shares on the ASX for more than you paid for them, the difference is your assessable capital gain—before applying any CGT discount or other adjustments.
For example, if you bought 100 shares in Company XYZ at $50 per share (total $5,000) and sold them at $75 per share (total $7,500), your assessable capital gain would be $2,500. However, if you held those shares for more than 12 months, you may be eligible for the CGT discount method, which could reduce the taxable amount to $1,250 (50% discount for individuals).
Understanding assessable capital gains is critical when using tools like Crowdfolio to forecast your tax position before you trade, as the software calculates assessable gains based on your chosen parcel-level lot selection method (FIFO, LIFO, specific identification, or highest-cost-first).
Asset Acquisition Date
The asset acquisition date is the date you purchased or acquired a CGT asset. This date is essential for determining whether you’re eligible for the CGT discount method (which typically requires a 12-month holding period for individuals) and for calculating your cost base.
For ASX shares and ETFs the acquisition date is the contract date shown on your contract note, not the settlement date. If you bought on Monday and settlement occurred on Wednesday, Monday is your acquisition date. This distinction matters because it affects when your 12-month holding period begins and when you can claim the CGT discount.
Keeping accurate records of acquisition dates is fundamental to effective tax planning. Crowdfolio imports transaction history from a broker CSV export, with templates for SelfWealth, Stake and CMC Markets plus a generic template for other brokers, and calculates holding periods and CGT discount eligibility from it.
Acquisition Cost
The acquisition cost is the amount you paid to purchase a CGT asset, including the purchase price and any incidental costs directly attributable to acquiring the asset (such as brokerage fees). This forms the foundation of your cost base calculation.
If you bought 50 shares at $100 each ($5,000) and paid $25 in brokerage, your acquisition cost would be $5,025. Over time, your cost base may be adjusted for non-assessable payments, AMIT cost base adjustments from an ETF or managed fund statement, or other CGT events (reinvested dividends do not adjust an existing parcel — each reinvestment is a new parcel with its own cost base), but acquisition cost is where the calculation begins.
Record-Keeping for Parcel Identification
Record-keeping for parcel identification is what lets you nominate which parcel you disposed of, and FIFO vs specific identification works through what each choice costs. It is the practical precondition for everything else on this page: the entitlement to specifically identify a parcel is only worth something if your records can actually tell one parcel from another.
In practice that means keeping, for every parcel, the acquisition date, the number of units, the price paid, and the brokerage. When you sell, record which parcel you nominated at the time of the sale — a contract note, a dated instruction to your broker, or a dated entry in your portfolio records will all serve. A reconstruction assembled months later, after the question has been asked, is a much weaker position.
Example: You own 100 shares bought at $10 and 100 bought at $15, and you sell 100 at $20. If your records identify the $15 parcel as the one disposed of, your capital gain is $500. If the parcels cannot be distinguished, a first-in, first-out basis applies and the gain is $1,000.
Average Cost
Average cost is generally NOT available for shares. TD 33 permits it only where the shares are in the same company, were acquired on the same day, and carry identical rights and obligations. You cannot average across parcels bought on different days. See how tax lot tracking works in Australia for the mechanics.
C
Capital Distribution
A capital distribution is a payment by a company to shareholders that represents a return of capital rather than a dividend. Unlike dividends (which are income), capital distributions reduce your cost base for CGT purposes.
For example, if you own shares in a company that returns capital to shareholders, the amount you receive reduces your cost base dollar-for-dollar. If your original cost base was $10,000 and you receive a $2,000 capital distribution, your new cost base becomes $8,000. This is important because it increases your future capital gain (or reduces a capital loss) when you eventually sell.
Capital distributions are less common than dividends but are important to track accurately. Many Australian investors use portfolio trackers to record these events and adjust their cost bases accordingly, ensuring accurate CGT forecasting and tax reporting.
Capital Gain
A capital gain is the profit you make when you sell an asset for more than its cost base. It’s the difference between the capital proceeds (sale price) and your cost base (original purchase price plus acquisition costs, adjusted for capital distributions and other events).
Capital gains are taxable in Australia for individuals, companies, and trusts, though the tax treatment varies. Individuals may be eligible for the CGT discount method if they held the asset for more than 12 months, while companies do not receive a discount. Understanding your capital gains position before you trade allows you to make tax-aware investment decisions.
For instance, if you’re considering rebalancing your portfolio by selling a stock that has appreciated significantly, knowing your capital gain upfront helps you evaluate whether the tax cost justifies the rebalancing. This is where Crowdfolio’s pre-trade CGT forecasting becomes invaluable—it shows you the tax outcome of your proposed trade before you execute it.
Capital Gains Tax (CGT)
Capital Gains Tax (CGT) is the tax levied on capital gains in Australia. When you sell a CGT asset (such as ASX shares or ETFs) for a profit, you must include the capital gain in your assessable income and pay tax at your marginal tax rate (subject to the CGT discount method for eligible individuals).
CGT is not a separate tax rate; rather, capital gains are taxed as part of your overall income. However, if you’re an individual who held the asset for more than 12 months, you can apply the CGT discount method, which reduces the taxable capital gain by 50%. This means you only pay tax on half the capital gain, effectively halving your tax bill on that gain.
The Australian Taxation Office provides comprehensive guidance on CGT rules, and understanding how CGT works is essential for any ASX investor. Many Australian investors struggle with CGT planning because they only consider the tax impact at tax time, rather than forecasting it before they trade.
Capital Proceeds
Capital proceeds are the money (or value of goods/services) you receive when you dispose of a CGT asset. For ASX shares, this is typically the sale price you receive when you sell the shares.
Capital proceeds include not just the sale price but also any other amounts received as part of the disposal, such as cash received in a takeover, the market value of shares received in a corporate action, or compensation received for an asset loss. The difference between your capital proceeds and your cost base is your capital gain or loss.
For example, if you sell 100 shares for $10,000, your capital proceeds are $10,000 (less any brokerage fees, which are deducted from proceeds). If your cost base is $7,500, your capital gain is $2,500.
Cost Base
The cost base is the amount used to calculate your capital gain or loss when you dispose of an asset. It includes your acquisition cost plus any incidental costs of acquisition, adjusted for capital distributions, reinvested dividends, and other CGT events.
Calculating cost base correctly is fundamental to accurate CGT reporting. For most ASX shares, the cost base is simply what you paid for them plus brokerage. However, if you’ve received capital distributions, reinvested dividends, or experienced other CGT events, your cost base may be adjusted.
For example:
- You buy 100 shares at $50 each = $5,000
- You pay $25 brokerage = $5,025 (acquisition cost)
- You receive a $500 capital distribution, which reduces cost base to $4,525
- You sell the shares for $7,500
- Capital gain = $7,500 − $4,525 = $2,975
Accurate cost base tracking is critical for tax compliance and for using Crowdfolio’s parcel-level tax forecasting features, which calculate cost base for each parcel and show you the tax impact of different lot selection methods (FIFO, LIFO, specific identification, highest-cost-first).
CGT Asset
A CGT asset is any asset that is subject to capital gains tax in Australia. This includes:
- Shares and units in listed companies (ASX stocks)
- Exchange-traded funds (ETFs)
- Managed fund units
- Investment property
- Collectibles and artwork
- Cryptocurrency and digital assets
- Business assets
Almost everything you own is a CGT asset. Your home, your car and low-value personal items are CGT assets too; it is a specific exemption or disregard that removes the gain, not the asset falling outside the CGT net. However, for ASX investors, shares and ETFs are clearly CGT assets, and any capital gain on their sale is taxable.
Understanding which assets are subject to CGT helps you plan your investment strategy and identify opportunities for tax-loss harvesting or strategic rebalancing.
CGT Discount Method
The CGT discount method is a concessional tax treatment available to Australian individuals and trusts who hold a CGT asset for more than 12 months (complying super funds get a one-third discount instead, and companies get none). Under this method, the taxable capital gain is reduced by 50%, meaning you only pay tax on half the capital gain.
For example, if you make a $10,000 capital gain on shares held for more than 12 months, only $5,000 is included in your assessable income. If your marginal tax rate is 45%, you pay tax on $5,000 instead of $10,000, reducing your tax bill from $4,500 to $2,250—a saving of $2,250.
The CGT discount method is one of the most important tax benefits for individual ASX investors. Understanding the 12-month holding period and planning your rebalancing around this threshold can significantly reduce your tax bill. H&R Block Australia provides detailed guidance on how the CGT discount works and its application to different asset types.
Crowdfolio lets you to forecast the tax impact of selling shares before and after the 12-month holding period, allowing them to time their trades for maximum tax efficiency.
CGT Event
A CGT event is any transaction or occurrence that triggers a capital gains tax calculation. Common CGT events include:
- Selling a share or ETF
- Gifting an asset to someone else
- Receiving shares in a takeover or merger
- Receiving a distribution from a trust
- Losing or destroying an asset
- Transferring an asset between entities
Each CGT event requires you to calculate whether you’ve made a capital gain or loss. Understanding CGT events is important for comprehensive tax planning, as some events (like receiving shares in a corporate action) may trigger unexpected tax consequences that you need to account for.
D
Discount Capital Gain
A discount capital gain is the amount of capital gain that is reduced by the CGT discount method. For an individual holding an asset for more than 12 months, the discount capital gain is 50% of the capital gain.
For instance, if your capital gain is $10,000, your discount capital gain is $5,000 (50% of $10,000). This $5,000 is included in your assessable income for tax purposes, not the full $10,000.
E
Equity ETF
An Equity ETF (Exchange-Traded Fund) is a fund that holds a portfolio of shares and is traded on the stock exchange (such as the ASX). Equity ETFs are popular with Australian investors because they provide diversification, lower fees than managed funds, and tax efficiency through their structure.
Common ASX-listed equity ETFs include broad market index funds (such as VAS or A200), sector-specific funds, and international equity funds. When you buy and sell equity ETF units on the ASX, you trigger CGT events and must track your cost base and capital gains, just as you would with individual shares.
Understanding the tax treatment of equity ETFs is important for tax-aware portfolio management. Crowdfolio lets you to track both individual shares and ETF units in a single portfolio, forecasting the combined tax impact of their rebalancing decisions.
F
FIFO (First In, First Out)
FIFO means nominating your oldest parcels first. It is not a method you register: TD 33 puts the choice on you, and the Commissioner accepts first-in-first-out as a reasonable basis while equally accepting your own selection. See how tax lot tracking works in Australia for the mechanics.
H
Highest-Cost-First
Highest-cost-first means nominating the parcels with the largest cost base, which produces the smallest gain on that sale. Like FIFO and LIFO it is a description of your own selection, not a registered election. See how tax lot tracking works in Australia for the mechanics.
HIFO (Highest-In, First-Out)
HIFO is a synonym for highest-cost-first, and is the label most often seen in US brokerage and crypto-tracking software. It means the same thing: nominate the parcels with the highest cost base first. As with HCF, it describes which parcels you specifically identify, not a separate election recognised by the ATO.
I
Incidental Costs
Incidental costs are costs directly attributable to acquiring or disposing of a CGT asset. For ASX shares, incidental costs include brokerage fees paid when you buy or sell shares. These costs are added to your cost base (for acquisition costs) or deducted from your capital proceeds (for disposal costs), affecting your capital gain or loss calculation.
For example, if you buy $5,000 worth of shares and pay $25 in brokerage, your acquisition cost is $5,025. If you later sell those shares for $7,500 and pay $25 in brokerage, your capital proceeds are $7,475 ($7,500 − $25). Your capital gain would be $7,475 − $5,025 = $2,450.
Accurately tracking incidental costs is important for precise CGT calculations. Many brokers include brokerage information in their CSV exports, which can be imported into Crowdfolio for accurate cost base and capital gain calculations.
L
LIFO (Last In, First Out)
LIFO means nominating your newest parcels first. There is no separate LIFO election; it simply describes which parcel you chose, and your records must support it. Newer parcels often have a higher cost base but may not yet qualify for the discount. See how tax lot tracking works in Australia for the mechanics.
Lot Selection
Lot selection is the act of deciding which parcel a sale disposes of. Because each parcel is a separate CGT asset with its own cost base and acquisition date, that choice changes the tax, and the holding period can matter more than the size of the gain. See how tax lot tracking works in Australia for the mechanics.
Lot / Tax Lot
Lot and tax lot are synonyms for parcel — a group of units acquired in a single transaction at a single price, tracked separately because each carries its own cost base, acquisition date and holding period. “Parcel” is the usual Australian term; “tax lot” is what you will typically see in broker platforms and imported software. See how tax lot tracking works in Australia for the mechanics.
P
Part IVA (Income Tax Assessment Act 1936)
Part IVA is an anti-avoidance provision in the Australian tax law that targets tax schemes with the dominant purpose of avoiding tax. If the ATO believes your investment strategy is primarily designed to avoid tax rather than for genuine investment reasons, they may apply Part IVA to deny the tax benefits you claimed.
For ASX investors, Part IVA is relevant to tax-loss harvesting strategies. If you sell shares at a loss and immediately repurchase identical (or substantially the same) shares, the ATO may argue that you’re attempting to artificially harvest tax losses without genuinely changing your investment position. This is closely related to wash-sale rules.
Understanding Part IVA and ensuring your tax strategies have genuine commercial purpose (beyond tax avoidance) is important for compliance. Crowdfolio flags potential Part IVA risks when you’re considering tax-loss harvesting and cites the relevant ATO guidance. That is a factual identification of a match, not an assessment of your legal position.
Parcel
A parcel is a group of shares (or units in an ETF) acquired at the same time and with the same cost base. When you own multiple parcels of the same security (because you’ve bought at different times and prices), you have choices about which parcels to sell when you dispose of some (but not all) of your holdings.
For example, if you own three parcels of VAS ETF units:
- Parcel 1: 100 units bought at $80 in 2021
- Parcel 2: 50 units bought at $85 in 2022
- Parcel 3: 75 units bought at $90 in 2023
When you sell 100 units, you can choose which parcel(s) to sell, affecting your capital gain. Parcel-level tracking and lot selection is central to tax-aware portfolio management, and Crowdfolio provides parcel-level visibility and forecasting to help you make tax-efficient decisions.
Portfolio Rebalancing
Portfolio rebalancing is the process of adjusting your portfolio to maintain your target asset allocation. For example, if your target allocation is 70% shares and 30% bonds, but market movements have shifted it to 75% shares and 25% bonds, you might rebalance by selling some shares and buying bonds.
Rebalancing is important for maintaining your desired risk profile, but it can trigger significant capital gains tax. Tax-aware rebalancing involves forecasting the CGT impact of your proposed trades and, where possible, using tax-loss harvesting or lot selection methods to minimize the tax cost.
Crowdfolio lets you to forecast the tax impact of rebalancing before they execute trades, allowing them to make tax-efficient rebalancing decisions. This is a key differentiator of tax-aware portfolio management—putting the tax cost inside the trading decision rather than only reporting it at tax time.
S
Specific Identification
Specific identification is nominating exactly which parcel you sold. TD 33 confirms the Commissioner accepts the taxpayer’s own selection, so this is an entitlement rather than a concession, provided your records make the parcel identifiable. See how tax lot tracking works in Australia for the mechanics.
T
Tax-Loss Harvesting
Tax-loss harvesting is a strategy where you deliberately sell an investment at a loss to offset capital gains elsewhere in your portfolio, thereby reducing your overall tax bill. The harvested loss can be carried forward indefinitely to offset future capital gains.
For example, if you have a $10,000 capital gain from selling one stock and a $3,000 capital loss from selling another stock, your net capital gain is $7,000 (instead of $10,000). This reduces your tax bill by $3,000 × your marginal tax rate.
However, tax-loss harvesting must be done carefully. If you sell shares at a loss and immediately repurchase the same, or substantially the same, shares, the ATO may apply Part IVA to deny the loss. Australia has no codified wash-sale rule with a fixed waiting period; the test is the dominant purpose of the arrangement. The ATO view is set out in TR 2008/1 and the alert TA 2008/7.
Crowdfolio lets you to identify tax-loss harvesting opportunities within their portfolio and to flag potential wash-sale or Part IVA risks before they execute the trade.
Trading vs. Investing
The distinction between trading and investing is important for tax purposes. Generally, if you’re buying and selling shares as a business or with the intention of making short-term profits, you’re a trader, and your gains are assessable income (not capital gains). If you’re buying and holding shares as a long-term investment, you’re an investor, and your gains are capital gains (eligible for CGT discount if held for more than 12 months).
The ATO looks at various factors to determine your status, including the frequency of trading, the period of ownership, the manner of acquisition and disposal, and your intention. If you’re classified as a trader, your gains are taxed at your marginal rate without the CGT discount, which can significantly increase your tax bill.
Understanding your trading vs. investing status is important for tax planning. If you’re rebalancing frequently, you should be aware that the ATO may question whether you’re actually a trader rather than an investor.
W
Wash Sale
A wash sale is the practice of selling an asset at a loss and reacquiring the same, or substantially the same, asset so that the loss is realised for tax purposes while the investment position is effectively unchanged. Australia has no codified wash-sale rule — the 30-day window you may have read about is a United States provision and has no Australian equivalent. The Australian exposure is instead the general anti-avoidance rule, Part IVA, under which the ATO may deny the loss where the dominant purpose of the arrangement was to obtain a tax benefit. Because the test is purpose rather than elapsed days, waiting a set number of days is not by itself a safe harbour.
For example, if you sell shares in Company ABC at a loss on December 15 and repurchase the same shares on December 20, the ATO may argue that you’re attempting to artificially harvest a tax loss without genuinely changing your investment position. They may deny the loss or reclassify your activity as trading rather than investing.
To avoid wash-sale issues, many investors use substitute securities. For example, if you sell shares in Company ABC at a loss, you might buy shares in a similar company or an ETF that provides similar exposure, rather than repurchasing the same shares immediately.
Crowdfolio flags potential wash-sale risks when you’re considering tax-loss harvesting, alerting you to situations where the ATO might challenge your loss claim. That gives you the facts to weigh before you trade.
What is the CGT discount for Australian investors?
Holding Period
The holding period is the length of time you’ve held an investment, calculated from the acquisition date to the disposal date. The holding period determines your eligibility for the CGT discount method (which requires more than 12 months) and affects your tax treatment.
For ASX investors, the 12-month holding period is a critical threshold. Assets held for more than 12 months qualify for the 50% CGT discount (for individuals), while assets held for 12 months or less do not. This difference can be significant—the tax on a $10,000 gain could be $4,500 (at 45% marginal rate, no discount) or $2,250 (with 50% discount), a difference of $2,250.
Crowdfolio lets you to track holding periods for each parcel and to forecast the tax impact of selling before and after the 12-month threshold, allowing them to time their trades for maximum tax efficiency.
Marginal Tax Rate
Your marginal tax rate is the tax rate applied to your last dollar of income. In Australia, marginal tax rates for 2026–27 are nil below the $18,200 tax-free threshold, then 15%, 30%, 37% and 45%, with the top rate applying above $190,000, plus the Medicare levy of 2%.
Your marginal tax rate determines how much tax you pay on your capital gains. If your marginal rate is 37% and you have a $10,000 taxable capital gain (after CGT discount), you pay $3,700 in tax. If your marginal rate is 45%, you pay $4,500 in tax—a difference of $800 on the same gain.
Understanding your marginal tax rate is important for evaluating whether a rebalancing trade is tax-efficient. Sometimes, deferring a capital gain to a future year (when your marginal rate might be lower) can result in significant tax savings.
Capital Loss
A capital loss occurs when you sell an asset for less than its cost base. Capital losses can be used to offset capital gains in the same year or carried forward to offset gains in future years. However, capital losses cannot be used to offset other income (such as salary or dividends)—they can only offset capital gains.
For example, if you have a $10,000 capital gain from one stock and a $3,000 capital loss from another stock, your gains net to $7,000 before the discount. If that gain is discount-eligible, half of it is assessable, so your net capital gain is $3,500 rather than $5,000 — meaning the $3,000 loss saves you $1,500 × your marginal tax rate, not $3,000 × it, because losses are applied before the discount.
Capital losses are valuable for tax planning, and many investors deliberately harvest losses to offset gains. This is where tax-loss harvesting strategies become relevant, and where Crowdfolio’s ability to forecast capital gains and losses before you trade becomes invaluable.
Dividend Reinvestment
Dividend reinvestment occurs when you reinvest dividend payments back into the company (or fund) by purchasing additional shares instead of receiving cash. When you reinvest dividends, you acquire additional shares, which have a new acquisition date and cost base equal to the dividend amount.
When you reinvest dividends, for CGT purposes you create new parcels with distinct cost bases and holding periods. For example, if you reinvest $500 in dividends to purchase 10 shares at $50 each, those 10 shares have a cost base of $50 and an acquisition date of the reinvestment date.
Accurately tracking dividend reinvestment is important for precise CGT calculations. Many brokers provide dividend reinvestment information in their transaction history, which can be imported into Crowdfolio for accurate cost base tracking.
Portfolio Drift
Portfolio drift occurs when market movements cause your portfolio allocation to deviate from your target allocation. For example, if your target allocation is 70% shares and 30% bonds, but a market rally increases your share allocation to 75%, you’ve experienced portfolio drift.
Portfolio drift can occur gradually over time, and many investors don’t realize how far their allocation has drifted until they review their portfolio. Monitoring portfolio drift and rebalancing periodically is important for maintaining your desired risk profile.
Crowdfolio provides portfolio drift monitoring tools that help you identify when your allocation has drifted from your target and forecast the tax impact of rebalancing before you execute trades.
Conclusion
Understanding CGT and tax terminology is essential for effective tax-aware portfolio management as an Australian ASX investor. For the mechanics behind these terms, see how capital gains tax works on shares in Australia. This glossary has covered the key terms you need to know, from basic concepts like capital gain and cost base to more advanced topics like lot selection methods, wash-sale rules, and Part IVA considerations.
The key takeaway is that tax-aware investing is not just about reporting your gains at tax time—it’s about forecasting the tax impact of your trading decisions before you execute them. By understanding these terms and using tools like Crowdfolio, which provides parcel-level tax forecasting and pre-trade CGT calculations, you can make more tax-efficient investment decisions and reduce your overall tax bill.
Whether you’re managing a simple portfolio of index ETFs or a complex mix of individual stocks and funds, having a clear understanding of these CGT terms will help you work more effectively with your accountant, make better trading decisions, and ultimately keep more of your investment returns.
For additional guidance, refer to the Australian Taxation Office’s CGT guide and definitions, consult with your tax adviser on specific situations, and use portfolio tracking tools to maintain accurate records of your acquisitions, disposals, and cost bases. Tax-aware investing is a discipline that pays dividends—literally—in the form of reduced tax bills and better long-term investment outcomes.