Rollover: What It Means in Simple Terms

Rollover is the automatic carrying of an open position to the next trading day. At a certain moment (usually late in the evening by the broker's server time) the position is extended, and it is at exactly this moment that the swap is credited or debited. Understanding rollover is useful for those who hold positions overnight or trade closer to the end of the day.

What happens at rollover

Rollover is a technical procedure of switching the trading day for an open position. Forex operates around the clock but is conventionally divided into trading days, and at the moment of transition to a new day the position is carried over. It is at exactly this moment that the swap is applied to it, a charge or credit for holding, tied to the difference in the interest rates of the currencies in the pair. Rollover itself does not change the position, but it triggers the swap accrual.

Rollover and swap

Rollover and swap are closely linked: rollover is the procedure, and the swap is its financial consequence. If you hold a trade through the rollover moment, the swap is applied to it (positive or negative depending on the pair and direction). If you close the position before rollover, there is no swap. So an intraday trader who closes trades before evening usually does not encounter swap or rollover at all.

Triple rollover on Wednesday

An important nuance: on Wednesday there is often a triple rollover, three days' worth of swap is credited or debited at once. The reason is that settlement of currency trades happens with a delay, and the swap for the upcoming weekend (when the market is closed but interest on currencies keeps accruing) is debited on Wednesday. So on Wednesday evening the swap can be noticeably larger than usual, which is important to consider when holding positions through this moment.

Practical nuances

The rollover time depends on the broker (usually around midnight server time). At this moment the spread may widen and liquidity may drop, so trading right at rollover is not always convenient. For an intraday trader who closes trades before evening, rollover plays no role. For a swing or position trader who holds positions overnight, rollover (and the swap tied to it) is a factor to account for in calculations.

Practical takeaways

Rollover is the automatic carrying of a position to a new trading day, at the moment of which the swap is credited. It matters for those who hold positions overnight: if a trade passes through rollover, the swap is applied to it (positive or negative). Remember the triple rollover on Wednesday, when three days' worth of swap is credited. Keep in mind that at the rollover moment the spread may widen and liquidity may sag. For an intraday trader who closes trades before evening, rollover is insignificant. Understanding rollover and its relation to the swap helps swing and position traders correctly account for the costs of holding positions and not be surprised by charges on the account.

This material is for educational purposes and is not individual investment advice.