How is forex trading taxed in the UK?

Is forex trading legal in the UK?

Yes, forex trading is entirely legal in the UK. It is one of the most widely traded markets in the world, and the UK — particularly London — is the global hub for foreign exchange activity. UK residents can trade forex through FCA-regulated brokers using spread bets, CFDs, or spot forex accounts.

How forex trading is taxed: the key distinction

HMRC does not have a specific tax category for forex trading. Instead, it applies existing tax frameworks based on how you trade and how it classifies your activity. The two most important variables are the instrument you use and whether HMRC considers your trading to be investment activity or a business.

Spread betting: tax-free for most UK forex traders

Spread betting on forex is free from capital gains tax and stamp duty for most UK residents. HMRC classifies spread betting as gambling rather than investing, which means profits fall outside the CGT regime.

This makes spread betting one of the most tax-efficient ways to trade forex in the UK. You do not need to report spread betting profits on your self-assessment tax return, and there is no stamp duty on opening a position.

The trade-off is that you cannot use spread betting losses to offset other capital gains. If you have a losing year on spread bets, those losses stay with you and cannot reduce your overall tax bill elsewhere.

The tax-free status also has limits. If HMRC determines that your spread betting activity constitutes your primary source of income and is conducted as a business or trade, profits may be subject to income tax. This is uncommon for retail traders but becomes a more meaningful risk for those trading very high volumes with professional infrastructure and no other significant income source.

CFD forex trading: capital gains tax applies

Forex profits from CFD trading are subject to capital gains tax for most retail traders. CGT is payable on net profits above the annual CGT allowance, currently £3,000 for the 2025/26 tax year.

Current CGT rates on financial assets are:

• 18% for basic rate taxpayers
• 24% for higher and additional rate taxpayers

Unlike spread betting, CFD losses can be used to offset other capital gains in the same tax year or carried forward to reduce future tax bills. This makes CFDs a useful instrument for traders who want to use losses as part of a broader tax management strategy.

CFDs are not subject to stamp duty, since no transfer of underlying asset ownership occurs.

When HMRC classifies forex trading as a business

This is the most consequential distinction for active traders and the one most commonly overlooked.

HMRC uses the ‘badges of trade’ to assess whether a person's forex trading constitutes a business rather than personal investing. If trading is classified as a business, profits are taxed as income rather than capital gains; potentially at 20%, 40%, or 45% depending on total income, with National Insurance contributions also potentially applicable.

The badges of trade relevant to forex trading include:

• The frequency and volume of trading
• Whether you have a profit-oriented infrastructure
• Whether trading is your primary occupation
• The sophistication and systematic nature of your activity

There is no fixed threshold. HMRC assesses the totality of circumstances. If you trade forex full-time, generate significant income from it, and have no other primary employment, professional classification is a genuine risk to consider.

In 2026, HMRC's access to trading data has improved considerably through the Common Reporting Standard, under which brokers and platforms share transaction data with tax authorities. Accurate record-keeping and proper reporting are more important than ever.

Spot forex and non-derivative trading

If you trade spot forex directly through a broker — rather than via spread bets or CFDs — the same CGT principles apply as for CFD trading. Profits above the annual allowance are taxable, and losses can be offset against other gains. Spot forex trading is not subject to stamp duty.

Record-keeping for forex traders

Regardless of how you trade, HMRC expects accurate records of all forex activity. This includes:

• The currency pairs traded
• Trade sizes
• Entry and exit prices
• Dates
• The profit or loss on each position

Reconstructing this information retrospectively is difficult and increases the risk of errors or penalties. Our platform provides downloadable trade histories that can be used for tax reporting purposes.

Reporting forex profits to HMRC

If you have taxable forex profits, you must report them via self-assessment. CGT gains are reported on the SA108 form. If HMRC classifies your trading as a business, profits are reported as self-employment income on the SA103F form.

The tax year runs from 6 April to 5 April. Self-assessment returns must be filed online by 31 January following the end of the relevant tax year.

How to trade forex with us

We offer access to over 80 currency pairs via spread bets and CFDs, with competitive spreads from 0.6 pips on EUR/USD. For more on getting started, see our guides on what is forex trading, how to trade forex, and spread betting vs CFDs.