How to Calculate Forex Taxes in the US, UK, and Australia
Forex tax rules vary significantly by country. Understanding how your trading profits are taxed is essential for compliance and avoiding surprises at tax time.
United States — Section 1256 Contracts
The IRS treats most retail forex trading under Section 1256 contracts, which receive a 60/40 tax split:
- 60% of gains are taxed as long-term capital gains (lower rate)
- 40% of gains are taxed as short-term capital gains (ordinary income rate)
This is generally favorable compared to ordinary income tax rates. Key points:
- Forex futures and options on forex qualify for Section 1256 treatment
- Spot forex (retail OTC trading) may be treated as ordinary income or Section 1256 depending on the broker and how you file
- You must file Form 6781 to report Section 1256 contracts
United Kingdom — HMRC Categories
HMRC classifies forex traders into three categories:
1. Casual trading (hobby)
- Not taxable if it’s genuinely occasional
- No expenses can be claimed
- Losses cannot be offset
2. Investment trading
- Treated as capital gains
- Annual allowance: £3,000 (2025/26)
- 10% on gains within basic rate band, 20% above
3. Professional trading
- Treated as trading income
- Subject to income tax at 20%, 40%, or 45%
- Full business expenses deductible
- Losses can be carried forward
Your trading frequency, intention, and organization determine your category. See HMRC’s manual at BIM56805.
Australia — ATO Treatment
The ATO treats forex gains/losses as either:
Capital gains (CGT) — for investors and occasional traders:
- 50% CGT discount if held 12+ months
- Included in assessable income
Ordinary income — for frequent/professional traders:
- 100% of profits taxed at marginal rates
- Full deduction for trading-related expenses
- Losses immediately deductible (not quarantined)
The ATO looks at factors like trading frequency, holding periods, intention, and whether it resembles a business. Our tax calculator handles all three categories automatically.
Quick comparison table
| Country | Treatment | Top rate | Loss offset |
|---|---|---|---|
| US | 60/40 split (Section 1256) | 37% (or 20% + NIIT) | Yes, limited |
| UK | Capital gains or income | 45% (income) / 20% (CGT) | Yes |
| Australia | CGT or ordinary income | 45% | Yes |
Use our free tax calculator to estimate your forex tax liability based on your country’s specific rules. It supports 195+ countries with progressive, flat, capital gains, and tax-free regimes.