Variation margin explained: meaning for forex traders
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
Variation margin is the additional cash a broker or clearing house collects from a trader when an open position moves against them. It tops up the account to cover the unrealised loss, protecting the counterparty from default. Unlike initial margin, it is recalculated continuously as prices change.
What is variation margin?
Variation margin is the daily, or sometimes intraday, transfer of funds that reflects changes in the mark to market value of open derivative positions. When a position loses value, the losing party posts variation margin to the winning party, usually through a clearing house or directly to the broker. It exists separately from initial margin, which is the upfront collateral required to open the position. In centrally cleared markets the calculation runs at least daily, while in retail forex the broker recalculates exposure tick by tick and issues a margin call or liquidation if equity falls below the maintenance threshold.
How traders use variation margin
Retail forex traders rarely see the phrase variation margin on their platform, but the mechanic is identical to the margin call they receive when floating losses eat into free margin. The broker marks every open position to the current bid or ask, deducts the running loss from account equity, and if equity drops below the maintenance margin level the platform either requests more funds or auto-liquidates positions. Institutional desks treat variation margin as a daily cash flow item, posting or receiving funds to the central counterparty after the settlement window. The desk monitors variation margin obligations against available liquidity, since a large adverse move can drain working capital before the position is closed, forcing forced selling elsewhere in the portfolio to meet the call.
Common misconceptions about variation margin
Traders often confuse variation margin with initial margin. Initial margin is the static deposit required to open a trade, while variation margin is the variable top up that reflects ongoing losses. A second misconception is that variation margin only applies to futures and cleared swaps. In practice every leveraged broker applies the same logic to retail CFD and spot forex accounts, just under different terminology such as margin call or stop out. A third error is assuming the funds are a fee. They are not a cost, they are collateral transferred to the winning counterparty and would flow back if the position later recovered.
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Frequently asked
What is the difference between initial margin and variation margin?
Initial margin is the upfront collateral a trader must deposit to open a position, calculated from notional size, leverage, and instrument volatility. Variation margin is the ongoing adjustment that tracks unrealised profit or loss as the market moves. Initial margin stays roughly fixed for the life of the trade, while variation margin is recalculated daily by clearing houses and continuously by retail brokers, flowing from the losing side to the winning side.
Does variation margin apply to retail forex accounts?
Yes, although retail platforms rarely use the term explicitly. When a position moves against a trader, the broker marks the equity down in real time and compares it against the maintenance margin requirement. If equity falls below the stop out level, the broker liquidates positions to recover the shortfall. This is functionally identical to a variation margin call in the cleared derivatives market, just executed automatically by the platform.
How often is variation margin calculated?
In centrally cleared markets such as futures and cleared interest rate swaps, the clearing house calculates variation margin at least once per day at the settlement price, and may issue intraday calls during volatile sessions. In retail forex and CFD accounts, the broker marks the position to market tick by tick, so the equivalent of variation margin is being calculated every time the price quote updates. Settlement of any shortfall happens instantly through account equity rather than a separate cash transfer.
What happens if a trader cannot meet a variation margin call?
If a trader fails to post variation margin within the required window, the counterparty has the right to close out the position and seize the initial margin to cover the loss. On retail platforms this happens automatically through the stop out mechanism, with no opportunity to fund the account first. In institutional contexts the clearing member is liable, and persistent failure to meet calls can trigger default procedures and the use of mutualised default funds.
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