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Read, reflect, then practise on demo. Take one useful idea into your next journal entry.
Search this question and you will find two kinds of answer. One says you can start with £100. The other says you need thousands before it is worth bothering. Both treat the deposit as the starting line, and both are answering the wrong question.
You will come away knowing why learning forex costs nothing in trading capital, how the 1% cap and position sizing make account size far less important than it looks, where size does matter, what a demo period has to prove before real money is even discussed, and which money should never go near a trading account at any balance.
Learning costs time, not capital
A demo account gives you live prices, a balance that is not real and every tool you need to practise. Charting can be free too: TradingView's free plan is enough to mark levels and practise a plan. No stage of learning to trade requires your own money to be in the market. If someone tells you that you need 'skin in the game' to learn properly, notice that they are describing pressure, and pressure is the one thing beginners already have too much of.
That does not make learning free. It costs hours, and if you pay for teaching it costs a fee. Keep that fee in its own column. Money paid for education is not trading capital, and the two should never come out of the same pot or be judged against each other.
Why account size matters less than you think
Most people assume a bigger account is a better account, but what decides whether you survive is the share of the balance each entry can cost, not the balance. That share is the 1% cap: no single entry may cost more than one per cent of the account. On a £500 demo balance that is £5. On £10,000 it is £100. A red entry costs the same proportion in both.
Position sizing is how you hold the cap. Decide where the stop goes first, from the chart, then size the position so that a stop-out costs no more than the cap. It is a single division: the cap divided by the stop distance in pips gives the value per pip you can trade.
| Demo balance | The 1% cap | Stop distance | Value per pip | What a red entry costs |
|---|---|---|---|---|
| £500 | £5 | 20 pips | 25p | 1% of the balance |
| £2,000 | £20 | 20 pips | £1 | 1% of the balance |
| £10,000 | £100 | 20 pips | £5 | 1% of the balance |
Read the last column. The behaviour is identical at every size: same stop, same decision, same proportion at stake. A trader who cannot hold the cap on £500 will not hold it on £10,000. The bigger number only makes the same mistake more expensive.
The 1% cap, at true scale
Where size does matter: the floor
There is one place account size bites, and it is mechanical. Every platform has a smallest position it will let you open. If that minimum, at your normal stop, costs more than one per cent of the balance, you cannot hold the cap. The rule breaks before the trade begins.
You can see it on demo. A 1,000-unit position on EUR/USD moves about 10 US cents per pip, so with a 20-pip stop it costs about $2 if the stop is hit, and the cap only holds where that $2 is no more than one per cent of the balance. That is arithmetic about the rule, not a figure to deposit, and clearing it says nothing about whether you should.
Leverage does not change any of this. Since 2019 the FCA has limited UK retail clients trading CFDs to 30:1 on major currency pairs and 20:1 on minor pairs (Policy Statement PS19/18). Leverage decides how much margin a position needs, so it decides whether you can open a trade. The cap decides whether you should. Small accounts tempt people to let the first override the second, and that is how a handful of ordinary red entries empties an account.
What a demo period has to prove first
Demo is not a waiting room. It is a test, and its pass condition has nothing to do with the balance going up. If you ever decide to put real money in, which is your decision and not something this lesson recommends, your demo record should already show these six things.
Six things your demo record should prove
Every entry held to the 1% cap
Not most entries. Every one, across the whole period, with no exceptions for a setup that felt certain. A single breach after a red day is the habit you are testing for, and demo is the only place it is free to find.
A written plan, followed
Count the demo entries that matched your plan exactly against the ones where you improvised. That adherence count is the number that matters, and it should be high and stable before anything else changes.
A journal line for every decision
Including the sessions where you took nothing. Each line says why it worked or why it didn't, in a sentence you could read aloud. Gaps in a journal tend to be the days the rules broke.
A red run survived at the same size
At some point you will have several red entries in a row on demo. The test is what came next: the same size and the same plan, or a bigger position to win it back.
Enough entries to mean something
A good fortnight proves little. You want dozens of entries taken the same way, so that a pattern in your demo journal is a pattern and not a coincidence.
Red entries you can explain
For each one, you can say whether the setup was valid and did not work, or whether you broke a rule. Only the second kind needs fixing, and you should be able to tell them apart without help.
Notice what is missing: a target balance. A demo balance that rose while the rules were broken has taught you the wrong lesson. Demo's known weakness is that it never feels like your money, which is a reason to hold its rules more strictly, not a reason to skip it.
Money that never belongs in a trading account
Some money is the wrong money whatever the amount. Borrowed money is the obvious one: a loan or a credit card adds interest on top of every setback. Rent, bills and anything already promised to someone are the same problem in a different shape. So is your emergency fund, and so is money you will need for something specific soon.
The reason is mechanical, not moral. Money with a job attached changes how you trade. When a red entry threatens the rent, you can no longer treat it as the running cost of a plan. You hold the cap until it hurts, then you size up to get back to where you were, and the plan stops being yours to follow.
Illustrative — two versions of the same week
Identical entries, different money
Picture the same plan and the same week, twice. Three red entries in a row, each held to the 1% cap, and the balance is down three per cent. Nothing unusual has happened: a plan with a fixed stop has red runs as part of its running.
In the first version the money is genuinely spare, and three per cent is an annoyance. You write three journal lines, check each entry against the plan, find two valid setups that did not work and one early entry, and take the next valid setup at unchanged size.
In the second version the money is next month's rent, and three per cent is a sum you now have to find. The next setup looks better than it is. The size creeps up, because a 1% entry no longer feels like it will fix anything. The same three red entries have started a much worse week, and nothing on the chart was different.
An illustration written to make the point, not a record of anyone's trading. The arithmetic is the same in both versions; the decisions are not.
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Watch the free webinar- How much money do you need to start trading forex?
- To learn, none: a demo account and free charting let you practise everything without trading capital. If you ever trade with real money, it should be money you could lose entirely without your life changing, and enough that your platform's smallest position fits inside the 1% cap at your normal stop. Beyond that, the share each entry can cost matters far more than the balance.
- Can you start forex trading with £100?
- Some accounts can be opened with that, but the useful question is whether you can hold the 1% cap on it. One per cent of £100 is £1, which may be less than your platform's smallest position costs at a sensible stop. Learning needs none of it: practise on demo, where the amount does not matter, until your record proves the behaviour.
- Does a bigger account make you a better trader?
- No. A bigger balance makes every decision more expensive, not better. The behaviour that keeps an account intact, meaning the 1% cap, a written plan and a journal, is identical at £500 and £50,000, and a trader who cannot follow it at one size will not follow it at the other.
- Should I use leverage to make a small account worthwhile?
- No. Leverage decides how much margin a position needs; it does not change what a stop-out costs as a share of your account. Using it to make a small account feel worth trading means abandoning the 1% cap, and that is how ordinary red entries turn into an empty account.
What to take away
- Learning forex needs no trading capital. Demo and free charting cover everything you need to practise.
- Education fees and trading capital are separate pots. Never judge one against the other.
- The 1% cap makes account size matter far less than it looks: a red entry costs the same share of any balance.
- Size matters in one mechanical place, the floor below which your platform's smallest position no longer fits inside the cap.
- Leverage decides whether you can open a position. The cap decides whether you should.
- Demo has to prove behaviour, not a balance: the cap held, the plan followed, a red run survived at unchanged size.
- Borrowed money, rent and emergency funds never belong in a trading account, whatever the amount.
So the honest answer has two parts. To learn, you need nothing but time. To ever trade with real money, you need money whose disappearance would change nothing, and enough of it that the 1% cap is physically possible. Any other number is a sales pitch. The size of an account has never kept one alive; the rules attached to it do.
The honest caveat
Educational content, not financial advice, and not a recommendation to deposit any amount or to trade with real money. Our programme trades demo throughout, and the figures above are illustrative arithmetic. Practise on demo first. Trading leveraged products involves significant risk and you can lose money quickly; never trade with money you cannot afford to lose. Results are never guaranteed, and the leverage limits quoted are the FCA's published rules for UK retail clients, which can change.
The Traderess coaching team
Written the way we coach — direct, structured, no shortcuts.