How Margin and Partial Exits Differ Between FX Futures and Spot

Summary

The document asks how selling part of a leveraged euro position affects borrowed funds and reinvestable profit. Its answer discusses FX futures and says that, in that setting, proceeds from selling a portion do not directly repay a spot-style loan. Instead, account margin rises with the position’s gain. It illustrates this with a small account, leverage, and an exchange-rate increase, describing the gain as a return on the initial margin.

The response also flags that futures are contracts rather than ownership of a fixed number of euros, so selling half a currency holding may describe a different instrument. This distinction is the main useful lesson: margin mechanics depend on whether the exposure is a futures contract or leveraged spot FX. The answer is tentative and does not fully explain futures mark-to-market, contract sizing, margin requirements, fees, or how a broker handles a partial close. Its arithmetic and wording should therefore be treated as an illustrative opinion, not a complete account of how all FX products work.

Key ideas

• A futures position is a contract and does not represent ownership of a specified number of euros.
• The answer distinguishes futures margin from borrowed funds used to finance a leveraged spot position.
• In the described futures example, gains increase available margin rather than repaying a spot-style loan.
• The instrument type and broker rules determine how a partial close affects exposure and account funds.
• The response is tentative and leaves contract sizing and detailed margin mechanics unexplained.

Tags

# Partial scaling out - how does it work with margin


# Partial scaling out - how does it work with margin












How does scaling out exactly work? For example if I have \$2 in my account, and buy 100 euros (say exchange rate is 1 eur = 1 usd) with 2% margin (so \$98 borrowed). It rises to say 1.02 USD for EUR and I sell 50 euros and get \$51. Does all of the \$51 go to paying the \$98 (so there is no profit in my account that I can reinvest)? If not, then how much will go to paying the \$98?

## Answer by KaiSqDist (score 1, accepted)

https://quant.stackexchange.com/a/80144

Not quite sure what you mean by scaling out, but within the context of investing in FX futures contracts, nothing goes to paying the $98. The available margin in your account just rises from \$2 to \$3 (100% profit) as the \$1 profit comes from (1/2%*0.02, which is an appreciation of the EUR to the USD).

If you are investing in futures contracts, technically you can't sell 50 Euros, so maybe I am talking about something separate from the instrument you are discussing about. But just putting my opinion here so that your post gets more traction.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.