A day trader’s inventory is time, attention, and a defined pot of risk capital. The share, the contract, or the bet is just the surface. If any of those three is borrowed from the rest of your life — sleep, rent, a job you cannot leave at 08:00 — the method is already broken before the first ticket.
What “same day” actually covers
On the London Stock Exchange the main cash session runs from 08:00 to 16:30 UK time, with an opening auction before the continuous market and a closing auction at the end. A person buying a UK share at 09:10 and selling it at 15:40 is day trading that share, even if they never use the phrase.
Foreign exchange is different. Major pairs trade from the Sunday evening open through to the Friday close, with London the deepest session of the day. Index products and US shares pull the afternoon toward New York. For much of the year the US cash equity open is 14:30 UK time. When the UK and the US are on different sides of the daylight-saving change, it falls at 13:30. A UK day trader who “only trades the open” needs to say which open.
The American pattern-day-trader rule, which restricts margin day trading in the United States unless an account holds a large minimum, is a FINRA rule. It is not a rule of the FCA and it does not apply to a UK resident using a UK broker. It can matter if you use a US broker. Do not import American forum lore into a British account without checking which rulebook you are actually under.
The instruments are not interchangeable
People say “I day trade the FTSE” and mean four different legal things.
- The share itself. You buy a UK listed company. Stamp Duty Reserve Tax is generally 0.5% on the purchase. You can hold it in a dealing account. Doing this many times a day is expensive, because the tax is paid on the way in and the spread is paid both ways. An ISA can hold shares, but an ISA is a poor costume for a rapid in-and-out style: transfers, settlement, and the annual subscription limit were not designed as a scalping pit.
- A contract for difference. You do not own the share. You agree to exchange the difference in price. There is no stamp duty on the CFD itself. There is a spread, sometimes a commission, and a financing charge if you hold past the rollover — which a strict day trader tries not to do. Gains are generally within capital gains tax for a private individual. Losses can often be set against other gains. Retail clients of FCA-authorised firms face leverage caps and negative-balance protection. Those protections are not a reason to use leverage. They are a seatbelt, not a destination.
- A financial spread bet. You stake a sum per point of movement. Offered by an FCA-authorised firm, it is a regulated financial product. For most private individuals HMRC treats the result as betting, so winnings sit outside capital gains tax and losses cannot be set against other gains. Tax treatment depends on circumstances and can change. A favourable tax result is not a favourable risk result. The same leverage that makes a small stake feel lively can empty the account.
- Futures, options, and currency pairs. Each has its own margin schedule, expiry, and way of being wrong. If you cannot explain in one sentence what you own, what closes the position, and what the maximum loss is, you are not trading that market. You are renting a feeling.
Retail leverage caps, so the advert does not set the number
The FCA’s intervention on contracts for difference limits how much leverage a retail client can be offered. The familiar caps, which you should re-check because regulators do revise them, are:
| Market | Typical retail cap | What £1,000 of margin represents |
|---|---|---|
| Major currency pairs | 30:1 | About £30,000 of exposure |
| Gold and major indices | 20:1 | About £20,000 of exposure |
| Other commodities and minor indices | 10:1 | About £10,000 of exposure |
| Individual shares | 5:1 | About £5,000 of exposure |
| Cryptocurrencies | 2:1 | About £2,000 of exposure |
A cap is a ceiling, not a suggestion. Professional-client status, which some firms invite experienced people to elect, removes several of these protections. Electing it to “get the real platform” is a common and expensive form of flattery.
Where the money leaks, even on a good read
Imagine a same-day round trip in £8,000 of a UK listed share, as an illustration of friction rather than a recommended trade. Stamp Duty Reserve Tax at 0.5% is about £40 on the purchase. The sale does not usually attract that tax again. A broker charging a few pounds a side adds a second, smaller cut. The spread — buying at the offer, selling at the bid — is a third. Do that five times in a morning and you have paid for the privilege of being busy. A CFD on the same notional skips the stamp and concentrates the cost in the spread and any commission. If the position is leveraged, the cash at risk can be a fraction of the exposure, which is precisely why a modest adverse move becomes a large percentage of the account.
Slippage sits on top. The price you saw when you decided is not always the price you receive, particularly in the auction, around a data release, or in a thin small-cap. Back-tests that fill on the midpoint of the candle are fiction.
A working day, described as hygiene
Nothing below is a strategy. It is the shape of a day that has a chance of being reviewed honestly.
- The night before, or early, write the one market you will watch and the events that could dominate it. Bank of England decisions, ONS inflation prints, and the large US releases are not background noise if you are flat-to-flat inside a session.
- Define the loss that ends the day, in pounds, before the open. Not a vibe. A number you can see on the account.
- Define the number of attempts. Three ideas that fail are information. A thirteenth idea is usually an argument with the morning.
- Enter only when the price is where the plan said it would be. “It has already moved, I will be late but smaller” is how plans become anecdotes.
- Flatten before the close you promised yourself. Overnight risk is a different product. If you wanted that product, you would have written a different plan.
- Log the trade in sentences: what you thought, what you did, what it cost, whether you broke the rule. The log is the only edge that still exists on a red day.
Who this tends to suit, and who it does not
Day trading suits almost nobody as a replacement for earned income. The public record of retail contracts for difference is blunt: a large majority of retail accounts lose money. Firms are required to disclose their own loss percentages, and those percentages are routinely grim. Spread betting has the additional texture of gambling, including the way a loss can provoke the next stake.
The people who last, when anyone lasts, usually already have living costs covered, treat the activity as a bounded risk budget, and can stop at a predetermined time without negotiating with themselves. If you need this month’s session to pay the council tax, you do not have a process. You have a second job that can invoice you.
If the appeal is “markets are interesting and I want my savings to have a chance of growing over ten years”, you are describing long-term investing. Read that before you open a leveraged account because a video made the candles look like a wage.