Start with the arithmetic, because it settles most of the argument. A signal on EURUSD with a 25 pip stop, on an account of 5,000.00 USD, at 1% risk. Fifty units of risk over 25 pips is 2.00 per pip, which on a standard lot of 100,000 is 0.20 lots. Take the same signal to a 25,000.00 USD account at the same 1% and you get 1.00 lot. One instruction, two sizes, identical proportional risk. That is what scaling is supposed to mean.
Risk percentage is the only rule that scales on its own
Fixed lots does not scale. If you set 0.05 lots, both accounts trade 0.05 lots, and the small account is now carrying five times the proportional risk of the large one. That is fine when you have one account and have chosen the number deliberately. It stops being fine the moment a second account of a different size exists, and the failure is silent, because both accounts fill correctly and only the drawdown differs.
The multiplier does not scale either, for a subtler reason. It copies whatever size the provider posted, scaled by your factor. A provider's 1.00 lot carries no information without knowing their balance, so the multiplier you would need for a proportional result is a number you cannot compute. Worse, if the provider changes their own account size, your risk changes and nothing tells you. The full comparison of the three rules is in the settings guide.
The floor that breaks small accounts
Every broker publishes a minimum lot, commonly 0.01 on a standard retail account, and some publish a step size above that. Run 0.5% risk on a 500.00 USD account against a 90 pip stop and the correct size is well below 0.01. The copier cannot place 0.004 lots. So either it rounds up to the minimum, which means you are taking more risk than your rule specified, or it refuses the trade.
Both answers are defensible and you should know which one you have configured. Rounding up quietly converts a 0.5% rule into something larger on exactly the widest-stopped trades, which are the ones you least wanted to oversize. Refusing means a small account sits out a category of setups and its results will not resemble the channel's. Neither is a bug. The real conclusion is that below a certain balance, a sizing rule stops having room to work, and the honest fix is a smaller account of a different kind or a different channel, as covered in lots and position sizes.
Split targets have the same floor. Splitting 0.03 lots across three take profits gives 0.01 each and works. Splitting 0.02 across three does not, and what happens instead depends on the rounding rule rather than on your intention.
Accounts in different currencies
An account denominated in EUR and one in USD do not produce the same lot size from the same percentage, because the risk amount converts and the pip value on the instrument may be quoted in a third currency. This is ordinary and it is handled, but it means you should not expect two accounts of nominally similar size in different currencies to show identical lots on the same signal. Compare percentage drawdown, not lots.
The same applies to account leverage. Leverage does not change the correct position size under a risk-percentage rule, since the size follows the stop distance and the balance. What it changes is whether the margin is available to hold that position at all, which is why a size that is right by the rule can still be refused for insufficient free margin. That distinction is worth understanding properly, and it is set out in margin and margin calls.
Prop accounts scale differently on purpose
An evaluation account with a daily loss limit is not sized by a percentage of balance in any useful sense, because the constraint is the firm's rule rather than your appetite. A 1% risk rule on an account with a 4% daily loss limit means four losing trades in one session ends the account, and copied signals from several channels can produce four losing trades in one session without anyone intending it. Size against the daily limit, not the balance, and read the firm's published rules on copied trades before connecting anything.
What to compare when you review the month
Percentage return and percentage drawdown, never lots and never currency amounts. Two accounts running identical instructions at different sizes will show completely different figures in money and near-identical figures in percentage, and any gap in the percentages is the thing worth investigating. If the small account is down more in percentage terms than the large one on the same trades, the minimum lot floor is the first suspect, because rounding up is silently concentrated in the widest-stopped signals.
Trade count is the second comparison. If one account took fewer trades than the other, the difference is refusals, and each refusal carries a reason: insufficient free margin, a spread above the guard, the position cap, or a symbol missing from that broker's list. That count usually explains more of a divergence than sizing does.
A workable arrangement for two accounts
Same channels, same risk percentage, same target handling, one live and one demo. The demo is not there to make money. It is there so that at the end of a month you have two statements produced by identical instructions, and any gap between them is fills, spread, swap and rejections rather than configuration. At the published rate, a second connected account is $9.00 USD a month, and it is the cheapest instrument available for answering why a channel's record and your account disagree. The account mechanics are in connecting a trading account.
Leveraged trading carries a high risk of loss, and running one signal across several accounts multiplies exposure rather than diversifying it. Software sizes positions. It does not decide how much of your capital belongs in the market.
"People add a second account and copy the same lot size onto it because it feels tidy. Tidy is how a small account ends up taking five times the risk of a large one on identical trades."
— Roman Onta, Executive Director, SINGUARD
Key Takeaways
- Risk percentage sized from the signal's own stop is the only rule that produces proportional positions across accounts of different sizes.
- A multiplier copies the provider's posted size, which carries no meaning without their balance and changes silently when they change it.
- Below a certain balance the correct size falls under the broker's minimum lot, so the copier must either oversize or refuse, and you should know which you configured.
- Prop evaluation accounts should be sized against the firm's daily loss limit rather than the balance, and against its published rules on copied trades.
Frequently Asked Questions
Why do two accounts show different lot sizes on the same signal?
Because risk percentage works from each account's own balance and the signal's stop distance. Different balances, currencies or account currencies produce different lots from the same instruction, which is the intended behaviour.
Can I copy one signal to five accounts at once?
Yes, with each account connected and configured separately. Understand that this multiplies exposure rather than spreading it, since all five accounts hold the same trade at the same time.
What if the calculated size is below my broker's minimum?
The copier either rounds up to the minimum or refuses the trade, depending on how you set it. Rounding up means exceeding your stated risk on the widest-stopped signals, which are the ones you least want oversized.
About the Author
Roman Onta is an Executive Director at SINGUARD. He builds the Prop Firm CRM, the Broker CRM, Scalegram and CopySignals side by side with his brother Alex Onta, and he helped on the design of eTrader, the division Alex built and leads. His ground is worldwide payment processing, AML compliance and the corporate structures brokers are built on, work the two of them carry together, shaped by executive roles in the UAE and international corporates. He lives and works in Dubai for most of the year. Meet the executive duo leading Singuard's five divisions.