BRYME Money · Broker & platform checks
Trading taxes: what you keep after the taxman
Gross profit is not net profit. The mechanics of four tax systems, and the rule that catches active traders.
Gross profit is not what you keep. Every jurisdiction with an income tax wants a share of trading gains, and the mechanics decide whether your strategy survives contact with the taxman. This page explains the machinery in four markets — the United States, the United Kingdom, Australia, and by extension what to ask anywhere else. It is not tax advice; it is the map you need before you ask a professional the right questions.
Tax is triggered by events, not by charts
In every system here, the taxable moment is a disposal: you sell, close, or otherwise realise a position. Unrealised gains on an open position are not taxed. This single fact links tax directly to turnover — the more often a strategy closes positions, the more often it creates taxable events, and the more of each gain is consumed by the combination of costs and tax. A strategy that trades daily is not the same product as one that trades quarterly, even when both end the year at the same gross profit.
United States: holding period decides the rate
For US taxpayers, profits on stocks and similar instruments are capital gains. The IRS splits them by holding period: positions held one year or less produce short-term gains, taxed like ordinary income; positions held longer than one year produce long-term gains, which carry their own rate bands (IRS Topic 409). A day trader realises nothing but short-term gains by definition. There is also a trap aimed squarely at active traders: the wash sale rule. Sell at a loss and buy substantially identical stock within 30 days before or after the sale, and the loss is disallowed for now — added to the cost basis of the new position instead (IRS Publication 550). Tax-loss harvesting that ignores the 30-day window simply defers the loss, it does not bank it.
United Kingdom: Capital Gains Tax and the annual exemption
UK residents pay Capital Gains Tax on chargeable gains above an annual exempt amount, which is set each tax year and has changed repeatedly in recent years — check the current figure on GOV.UK rather than trusting any article, including this one, for the number. The structural points are stable: gains are computed per disposal, losses can offset gains, and the exempt amount shelters only so much per year. Different products are treated differently — CFDs and other derivatives do not follow the same rules as shares — so the instrument list matters as much as the profit number.
Australia: CGT and the 12-month discount
Australian residents pay tax on capital gains as part of income tax, with the ATO treating most disposal events as CGT events. Individuals holding an asset for at least 12 months generally qualify for a CGT discount on the gain (ATO guidance). The discount creates the same structural incentive the US system does: short holding periods forfeit relief. Traders classified as carrying on a business — a status the ATO decides on the facts, not on self-description — are taxed under different rules again.
Canada and everywhere else
Canada taxes capital gains through the CRA with its own inclusion mechanics, and day-trading activity can be treated as business income rather than capital — the facts of your trading decide which. Nigeria and every other jurisdiction have their own regimes and thresholds. The portable rule: before you scale a strategy, establish (1) what counts as a disposal, (2) how holding period changes the rate, (3) which losses are deductible and under what conditions, and (4) whether your activity level reclassifies you as a business. Those four answers change the net return of a strategy more than most indicators ever will.
The arithmetic that matters
Worked example: two strategies, both 12% gross. Strategy A closes 120 times a year; Strategy B closes 12. If each round trip costs 0.15% in spread and fees, A surrenders 18% of the account to friction before tax; B surrenders 1.8%. Add short-term treatment on every one of A's gains, and the gap widens further. The tax system does not punish trading; turnover compounds every cost the desk has already catalogued — spread, commission, financing — and tax lands on top.
Use this page as a checklist, not a filing guide. Take the four questions above to a qualified adviser in your own jurisdiction, with your actual trade history. The desk's position-size calculator keeps the pre-tax risk honest; your adviser keeps the after-tax number honest.
Sources and further reading
Links were reviewed 2026-09-25. Regulatory permissions, firm status and product terms can change; use the current official register before acting.
General information, not financial advice. Everything on BRYME Money is educational. Trading forex, crypto and derivatives involves substantial risk of loss and is not suitable for everyone. Past performance — including any published research — does not guarantee future results. Never trade money you cannot afford to lose.