A rollover is the interest paid or earned on an open position held past the close of the NY trading at 1700 ET reflecting the interest rate differential between the two currencies. The spot forex market is traded on a two-day value date. For example, for trades executed on Monday, the value date is Wednesday. However, if a position is opened on Monday and held overnight (remains open after 1700 ET), the value date is now Thursday. The exception is a position opened and held overnight on Wednesday. The normal value date would be Saturday; because banks are closed on Saturday the value date is actually the following Monday. Due to the weekend, positions held overnight on Wednesday incur or earn an extra two days of interest. Trades with a value date that falls on a holiday will also incur or earn additional interest.
