Day Trading Tax Calculator

An estimate, not tax advice. This calculation is for an Australian resident for tax purposes for the whole of the 2026–27 income year (1 July 2026 to 30 June 2027), or 2025–26 if you choose it, trading in their own name. There is no separate day trading tax in Australia: trading results are taxed under the income tax, at your marginal rate plus the Medicare levy. Positions closed within 12 months never get the 50% CGT discount, so in a profitable year the treatment changes little; what it changes is how expenses and losses count. Whether you are an investor, a share trader or someone trading CFDs outside a business depends on the facts, and the calculator does not decide it. A loss is not always deductible, so any saving it shows for a losing year is a possible saving, not a certain one. Check with a registered tax agent before you lodge.

What is an Australian day trading tax calculator?

An Australian day trading tax calculator is a tool that works out the income tax and Medicare levy on a year of trading under the Australian Taxation Office (ATO) rules for the 2026–27 income year, for three possible treatments of the same results: share investor, share trader carrying on a business, and CFDs traded outside a business.

Day trading tax is a search term, not a tax. Your trading results are taxed under the ordinary income tax, and the question is which part of the law they fall into:

• Share investor, the normal case: gains and losses are capital gains and capital losses. Commissions are already inside the results of your trades, other costs such as data and software do not reduce the gain, and a net loss can only be used against future capital gains.
• Share trader, someone who carries on a business of trading: shares are trading stock and profits are ordinary income. Business expenses are deductible, and a net loss can reduce your other income, salary included, only if the non-commercial loss rules are met.
• CFDs, not a business: under ATO ruling TR 2005/15, a gain on CFDs you trade for profit is taxable at your marginal rate even outside a business. A loss is deductible only under certain conditions.

Because positions are closed within 12 months, none of the three gets the 50% CGT discount, and all of them reach the same resident tax rates, from nil on the first $18,200 to 45% above $190,000, plus the 2% Medicare levy. The calculation works on the balance of the year, not on a single trade.

The calculator takes five visible inputs, “Other taxable income”, “Trading profits”, “Trading losses”, “Other expenses” and “Tax treatment”, with the options “Investor (CGT)”, “Trader (business)” and “CFDs, not a business”, plus two advanced fields, “Income year” and “Losses carried forward”. It returns “Tax on your trading” or, in a losing year, “Tax saving if the loss is deductible”, with the condition written under the number; then “Income tax”, “Medicare levy”, “Effective rate” and “After-tax result”; and a fixed table that sets the three treatments side by side.

Why is the day trading tax calculator important for traders in Australia?

The day trading tax calculator is important for Australian traders because the treatment you fall under changes how your expenses and your losses count, not your tax rate, and only a side-by-side calculation shows by how much. In a profitable year, being a share trader rather than an investor changes the tax by the value of your deductible expenses, not by the rate: on $85,000 of other income and a $25,000 trading result, an investor pays $8,000 and a trader $7,040, a difference of $960 that is simply $3,000 of expenses at 32%.

The losing year is where the treatments really part company. With $70,000 of other income and a year that loses money, a trader who meets the non-commercial loss rules could save $4,975 of tax on salary, a CFD trader outside a business could save $3,970 if the loss is deductible, and an investor saves nothing this year because the loss only waits for future capital gains. A calculator that treated the trader’s loss as a capital loss would be wrong by $4,975.

Use the calculator while the income year is still open: before 30 June, when you can still see the balance of your trading year; when you are deciding whether your costs are deductible at all; when a losing year raises the question of what the loss is worth; and when your trading income grows large enough that the ATO may ask you to pay PAYG instalments during the year. The calculator flags those instalments and does not calculate them.

How do you use the Australian day trading tax calculator?

To use the Australian day trading tax calculator, enter your other taxable income, the year’s trading profits and trading losses, your other expenses and a tax treatment; press Calculate and the tool returns the tax on your trading, or the tax saving if a loss is deductible, together with the three treatments side by side.

The steps to use the Australian day trading tax calculator are listed below:

1. Enter your other taxable income. This is your salary and other taxable income for 2026–27, before any trading and already after deductions. That includes the work-related standard deduction of up to $1,000, which applies automatically if you have labour income and is reduced by any work-related expenses you claim.
2. Enter your trading profits. Add up every trade closed at a profit during the income year, after commissions.
3. Enter your trading losses. Add up every trade closed at a loss, with commissions included.
4. Enter your other expenses. Data, platforms, software and equipment. They are deducted only in the “Trader (business)” treatment.
5. Choose a tax treatment. “Investor (CGT)” is the normal case. Choose “Trader (business)” only if your trading is a business. Choose “CFDs, not a business” if you trade CFDs for profit outside a business: for the ATO the gain is ordinary income even then, while the loss is deductible only under certain conditions.

Two advanced fields refine the result. “Income year” switches between “2026–27”, the default, and “2025–26”. “Losses carried forward” takes the net capital losses from earlier years that you have not used; they count only in the investor treatment, and in the other two the field is switched off with a notice. The calculator assumes that every position was held for less than 12 months: for a position held longer, the capital gains tax calculator applies the discount. Each press of Calculate refreshes every row and the comparison table together.

What formula does the Australian day trading tax calculator use?

The Australian day trading tax calculator uses a two-stage formula: it nets the year into a single result, deducting other expenses only for a trader, then prices that result incrementally, as the tax on your income with the trading minus the tax on your income without it; in a losing year it measures the tax the loss could save instead.

In these formulas, Other expenses are subtracted only in “Trader (business)” mode. The Taxed result is the whole result for a trader or for CFDs, and for an investor the result less any “Losses carried forward”, with no discount. T is the full tax on a taxable income: resident income tax for the chosen year, less the low income tax offset of up to $700, which never takes income tax below zero, plus the Medicare levy, which is nil up to $28,011 and above that the lower of 2% of taxable income and 10% of the part over $28,011. The 2026–27 levy threshold has not been set yet, so the calculator uses the 2025–26 figure. The saving formula applies only to the trader and CFD treatments, and any part of a loss larger than your other income stays to be carried forward. An investor’s loss saves nothing this year.

For example, as a trader, $40,000 of profits less $15,000 of losses and $3,000 of expenses gives a $22,000 result, which on $85,000 of other income adds $6,600 of income tax and $440 of levy, or $7,040.

The formula prices the balance of one income year for positions held less than 12 months; it does not decide which treatment applies to you.

What is an example of a day trading tax calculation?

An example of a day trading tax calculation is a salaried trader with $85,000 of other taxable income who closed $40,000 of winning trades and $15,000 of losing trades in 2026–27 and spent $3,000 on data and software, which produces $8,000 of tax as an investor and $7,040 as a trader, worked out as follows:

1. Net the trades. $40,000 less $15,000 = $25,000.
2. Price it as an investor. The $3,000 of expenses does not reduce a capital gain, and with no position held 12 months there is no discount, so the whole $25,000 is added: taxable income rises from $85,000 to $110,000, inside the 30% bracket. Income tax is $7,500 and the Medicare levy $500, so “Tax on your trading” is $8,000, an effective rate of 32.00%. The after-tax result is $40,000 less $15,000, less $3,000, less $8,000: $14,000.
3. Price it as a trader. The expenses are deducted, so the result is $22,000 and taxable income rises to $107,000. Income tax is $6,600 and the levy $440: $7,040, also an effective rate of 32.00%, with an after-tax result of $14,960.
4. Price it as CFDs outside a business. The expenses are not deducted, so the result is $25,000 and the tax is $8,000, the same as the investor, with an after-tax result of $14,000.
5. Compare. The gap between the trader and the other two is $960, which is $3,000 of expenses at 32%.

In a profitable year the trader treatment is worth the expenses, not a different rate. These are the calculator’s starting values in the default “Investor (CGT)” treatment, so pressing Calculate without changing anything reproduces the first figure, with the other two in the comparison table.

How do you read the Australian day trading tax calculator’s result?

You read the Australian day trading tax calculator’s result by first checking which headline appears: “Tax on your trading” in a profitable year, or “Tax saving if the loss is deductible” in a losing one, with the condition for your treatment written under the number. Then read the split between “Income tax” and “Medicare levy”, the “Effective rate” and the “After-tax result”, and finish with the comparison table, which is the real point of the page.

“Effective rate” is the tax divided by the result in a profitable year, and the saving divided by the loss in a losing year. “After-tax result” always subtracts the expenses you paid, whatever the treatment, because it is the money the year actually leaves you: in a profitable year it is profits less losses, expenses and tax; in a losing year it is a negative number, the real loss reduced by the tax saving if the loss is deductible. In the comparison table, the savings shown for the trader and CFD treatments carry the words “if deductible”.

The effective rate climbs when a result crosses a bracket. Take $170,000 of other income, $60,000 of profits, $20,000 of losses and $5,000 of expenses:

For the trader, income rises from $170,000 to $205,000: $20,000 is taxed at 37% and $15,000 at 45%, which gives $14,150 of income tax plus $700 of levy. For the other two, income reaches $210,000 and the tax is $16,400 plus $800.

The notices under the result matter as much as the numbers:

• in the investor treatment, a loss can be carried forward only against capital gains;
• in the trader treatment, a loss counts against other income only under the non-commercial loss rules of Division 35, and when your other taxable income is $250,000 or more the notice reads “loss deferred (non-commercial loss rules)”;
• in the CFD treatment, the condition of section 25-40 is shown next to any saving;
• a reminder about PAYG instalments, which the ATO can ask of people with a lot of investment income.

Amounts are shown to the cent and percentages to two decimals, rounded half up; the calculation itself runs at full precision.

Why does a losing year change the day trading tax calculation the most?

A losing year changes the day trading tax calculation the most because it is the only point where the three treatments give truly different answers: an investor’s loss waits for future capital gains, a trader’s loss can reduce tax on salary under the non-commercial loss rules, and a CFD loss outside a business is deductible only under certain conditions. In a profitable year the gap is the expenses; in a losing year it can be thousands of dollars.

Take $70,000 of other income, $20,000 of profits, $32,000 of losses and $3,000 of expenses:

For the trader, income falls from $70,000 to $55,000. Tax on $70,000 is $11,520 of income tax plus $1,400 of levy, or $12,920; tax on $55,000 is $7,020 less a $175 offset plus $1,100 of levy, or $7,945. The saving of $4,975 is $4,675 of income tax, made of $4,500 at the 30% rate and $175 of low income tax offset recovered, plus $300 of Medicare levy. For CFDs the expenses are not deducted, so income falls only to $58,000, where the tax is $8,950, and the saving is $3,970: $3,730 of income tax and $240 of levy. The investor’s expenses do not count at all. A calculator that treated the trader’s loss as a capital loss would miss $4,975.

The trader’s saving is conditional on the non-commercial loss rules in Division 35. A loss from a business reduces your other income only if your taxable income without the loss, plus a few other items, is under $250,000, and the business passes at least one of four tests:

• assessable income from the business of at least $20,000;
• a profit in 3 of the last 5 years;
• real property used in the business worth at least $500,000;
• other assets used in the business worth at least $100,000.

Otherwise the loss is deferred to future years of the business. The calculator checks only the income requirement, from your “Other taxable income”; the other items and the four tests are assumed and stated.

The $250,000 line is strict, and it applies only to a business. Take a year with $10,000 of profits and $20,000 of losses, a result of −$10,000:

• Trader with $240,000 of other income. Income falls to $230,000, all in the 45% bracket: $4,500 of income tax and $200 of levy, a $4,700 saving if deductible, provided one of the four tests is met.
• Trader with $260,000 of other income. The income requirement is not met, and even $250,000 exactly would not be enough: the saving is $0.00 and the $10,000 loss is deferred.
• CFDs outside a business, with $260,000 of other income. Division 35 does not apply outside a business, so the $250,000 line does not remove the saving: income falls to $250,000 and the saving is $4,700 if deductible, still a possible saving, not a certain one, under the same section 8-1 or section 25-40 condition.

How does the ATO decide whether the day trading tax calculation should treat you as a share trader?

The ATO decides whether you are a share trader from the facts of your activity, not from a number of trades, so the day trading tax calculator never makes that choice for you: it shows the three treatments side by side and lets you see what each one would mean.

Am I a share trader? No number of trades makes you one automatically. The ATO looks at the facts: the nature and purpose of your activity, its repetition, volume and regularity, whether you run it in a business-like way and the capital involved. Intending to make a profit is not enough on its own. A trader’s loss reduces other income only if the non-commercial loss rules are met; otherwise it is deferred.

There is no registration and no threshold that turns an investor into a trader, and no professional trader status to apply for. The investor treatment is the normal case, which is why “Investor (CGT)” is the default. The classification is a question for a registered tax agent, and it has consequences beyond this year: someone who moves from investing to trading turns the shares they hold into trading stock, which can have CGT effects of its own, through CGT event K4.

Two ideas imported from American guides have no Australian equivalent. There are no short-term and long-term rates, only gains with or without the discount, and there is no self-employment tax: the Medicare levy is paid on taxable income whatever its source, trading profits included.

How are CFDs treated in the day trading tax calculation?

CFDs are treated in the day trading tax calculation as a third case, “CFDs, not a business”, because under ATO ruling TR 2005/15 a gain on CFDs traded for profit is taxable at your marginal rate even when you are not running a business, while a loss is deductible only under certain conditions.

CFDs are different. Under ATO ruling TR 2005/15, a gain on CFDs you trade for profit is generally taxable at your marginal rate, even if you are not running a business. A loss is not always deductible: it is deductible when the CFDs were part of a business or a commercial transaction for profit; if they were part of a profit-making plan, the loss is deductible only if you notified the ATO or the Commissioner accepts that you entered into them for profit. That is why the saving we show for a losing year is a possible saving, not a certain one. This calculator shows each treatment side by side; it does not decide which one applies to you.

The ruling describes two routes, and the difference only matters when you lose:

• A business, or a commercial transaction for profit. Under the Myer principle, which can apply even to a single isolated transaction, the gain is ordinary income under section 6-5 and the loss is deductible under section 8-1.
• A profit-making undertaking or plan. The gain is taxed under section 15-15, and the loss is deductible under section 25-40 only if you notified the Commissioner or the Commissioner accepts the profit purpose, as section 25-40(3) requires.

CFDs used for gambling or recreation are excluded from both routes, a case the ATO itself does not ordinarily expect. Which route applies depends on facts the calculator cannot know, so in a profitable year it taxes the gain the same way under either, and in a losing year it shows the saving with its condition. It also leaves out expenses other than your trades in this mode, as a prudent choice, because their deductibility outside a business depends on the facts. Choosing among CFD brokers in Australia is a separate question from this one: the tax treatment follows how and why you trade.

What are the limits of the Australian day trading tax calculator?

The main limit of the Australian day trading tax calculator is that it prices the balance of one income year for an Australian resident for tax purposes, under a treatment you choose, from totals you have already worked out: it does not classify you, and it does not keep your trading records.

The following points sit outside the calculation:

• The classification itself. Whether you are an investor, a trader, or trading CFDs for profit or for recreation is a matter for a registered tax agent.
• The CFD loss route. Whether a CFD loss falls under section 8-1 or section 25-40, and whether the condition of section 25-40(3) is met: the tool shows the saving as conditional and does not check either.
• Trading stock valuation at 30 June. A trader can value stock at cost, market value or replacement value, which can bring gains or losses on open positions into the year. Not modelled.
• Margin forex and Division 775. Gains and losses on foreign currency follow their own rules and need checking case by case; the tool accepts your totals in Australian dollars. If you trade margin forex with one of the forex brokers in Australia, check the treatment of your results with a registered tax agent.
• Futures, options and warrants, which have rules of their own.
• Deferred losses from earlier years in the trader treatment, the other items of the Division 35 income requirement, the four tests themselves and the Commissioner’s discretion.
• PAYG instalments, flagged and not calculated, the Medicare levy surcharge, HELP and HECS repayments, GST, which is irrelevant for trading financial instruments, and trading through a company or a trust.
• The rules from 1 July 2027, which do not touch ordinary income but do change the treatment of capital gains for investors.
• Super, non-residents and temporary residents, as for every tax calculator on this site.

Two practical points complete the picture. The 2026–27 Medicare levy low-income threshold has not been set yet, so the calculator uses the 2025–26 figure of $28,011; only total incomes between $28,011 and about $36,000 are affected. And the tool calculates the tax, not the lodgement: for 2026–27 a return you lodge yourself is due by Monday 1 November 2027, because 31 October falls on a Sunday, with the tax due by 21 November; through a registered tax agent the dates are later.

What is the difference between a day trading tax calculation and a capital gains tax calculation?

The difference between a day trading tax calculation and a capital gains tax calculation in Australia is the holding period and the unit of measure: a day trading calculation nets a whole year of positions held less than 12 months and compares three treatments, while a capital gains tax calculation prices one sale, which earns the 50% discount once the asset has been held 12 months.

Choose by how long you held and how often you trade. A year of short positions belongs on this page. A single sale of shares or ETFs that you held, especially for 12 months or more, belongs on the capital gains tax calculator, where the discount and the order of your losses decide the result.

Which calculators are related to the Australian day trading tax calculator?

The calculators related to the Australian day trading tax calculator are the ones an active trader uses before the trade rather than after the year, plus the tax calculator for positions held longer.

The related calculators are listed below:

• Position Size Calculator: sizes a trade against the risk you accept, which shapes the yearly result this tax is charged on.
• Risk Reward Calculator: tests whether a setup pays for its own risk before tax enters the picture.
• Forex Profit Calculator: works out the result of a single forex or CFD trade, the building block of the yearly totals.
• Capital Gains Tax Calculator: prices a sale of shares or ETFs held for 12 months or more, with the 50% discount.

FAQ

This calculator is an educational estimate and does not replace tax advice. It applies the ATO’s 2026–27 resident tax rates, or 2025–26 if you choose them, the tax-free threshold, the low income tax offset and the Medicare levy with its low-income reduction for a single person to a year of trading by an Australian resident for tax purposes, under three treatments shown side by side: share investor, share trader carrying on a business, subject to the non-commercial loss rules, and CFDs traded outside a business under ATO ruling TR 2005/15. Savings shown for a losing year are possible, not certain. It does not decide which treatment applies to you, and it leaves out trading stock valuation, margin forex and Division 775, futures, options and warrants, deferred losses, PAYG instalments, the Medicare levy surcharge, HELP and HECS repayments, companies and trusts, super, non-residents and the rules that apply from 1 July 2027. The 2026–27 Medicare levy low-income threshold has not been set yet: we use the 2025–26 figure ($28,011). Sources: resident tax rates, low income tax offset, Medicare levy thresholds, share investing and trading guidance, non-commercial loss rules and ruling TR 2005/15 published by the Australian Taxation Office. Data last checked: 21 October 2026. Check with a registered tax agent before you lodge.