Why are historic equity and floating P/L described as "approximate"?
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No trading platform is capable of providing your actual historic account equity at a particular date in the past. On any site such as ours, calculations of historic floating P/L (and therefore equity) are done by calculating the open positions at that time and then using a historic price feed to work out the gain/loss on the open position. This is generally a very good approximation, but the figure will nevertheless not be 100% accurate.