How Does Rollover Work in Forex?
Rollover in forex refers to the process of extending the settlement date of an open position from one trading day to the next. Because spot forex trades theoretically settle two business days after they are executed, any position that remains open past the daily cutoff time is rolled over to a new settlement date, and a swap charge or credit is applied to reflect the interest rate differential between the two currencies involved.
For most retail forex traders, rollover is an automatic process that happens in the background. Understanding how it works helps traders account for the ongoing cost or benefit of holding positions overnight.
Why Rollover Exists
The forex market operates on spot settlement conventions, meaning transactions theoretically settle two business days after the trade date, a system known as T+2. This is a legacy of the time when banks needed two working days to process international currency transfers.
In practice, retail traders do not take physical delivery of currencies and have no intention of settling these transactions. Instead, at the end of each trading day, any open positions are automatically rolled forward to a new settlement date by the broker. This process is the rollover.
To roll the position forward, the broker closes the trade at the current day’s settlement date and simultaneously reopens it at the next settlement date. The difference in price between the two settlement dates reflects the interest rate differential between the two currencies and appears in the account as a swap charge or credit.
How the Rollover Rate Is Calculated
The rollover rate is based on the overnight interest rates of the two currencies in the pair, specifically the rate at which banks lend to each other in the interbank market. These rates are influenced by the central bank interest rates of the respective currencies.
When you are long a currency with a higher interest rate and short a currency with a lower interest rate, the rollover works in your favour and you receive a credit. When you are long a lower rate currency and short a higher rate currency, you pay a debit.
The actual rollover rate applied by a retail broker also includes the broker’s own margin, which means the rate applied is not purely the raw interbank differential. Brokers typically adjust the rate to include their own spread on the rollover.
The Rollover Cutoff Time
The rollover happens at a specific time each day, which varies by broker but is typically around 17:00 New York time or 22:00 GMT. Any position that is open at that exact moment is subject to the rollover process and the associated swap charge or credit.
Positions opened after the cutoff time and closed before the next cutoff time are not subject to rollover. Day traders who close all their positions before the cutoff time avoid swap charges and credits entirely.
The Wednesday Rollover
One important detail of the rollover system is what happens on Wednesday. Because forex settles on a T+2 basis, a position rolled on Wednesday is settling for Friday, and the next business day settlement after Friday is the following Monday. This means the Wednesday rollover covers three days of interest rather than one.
As a result, the swap or rollover charge applied on Wednesday is typically three times the normal daily rate. Traders who hold positions through the Wednesday cutoff time should be aware of this increased charge or credit.
Rollover and the Carry Trade
The relationship between rollover and interest rate differentials is the foundation of the carry trade strategy. In a carry trade, a trader buys a currency with a high interest rate against a currency with a low interest rate, with the intention of collecting a positive rollover credit each night the position is held.
The carry trade works when interest rate differentials are significant and the exchange rate remains stable or moves in the trader’s favour. It becomes unprofitable if the exchange rate moves against the trader by more than the accumulated rollover credits, or if interest rates change in a way that reduces or eliminates the differential.
Rollover and Islamic Accounts
For traders who cannot pay or receive interest for religious reasons, many brokers offer Islamic or swap free accounts. On these accounts, the rollover mechanism is disabled and no swap charges or credits are applied to overnight positions. The broker typically manages the cost of this through alternative fee arrangements.
Frequently Asked Questions
What is rollover in forex? Rollover is the process of extending the settlement date of an open forex position from one trading day to the next. It results in a swap charge or credit being applied to the account, reflecting the interest rate differential between the two currencies in the pair.
Is rollover the same as a swap? The terms are closely related and often used interchangeably. The rollover is the process of extending the settlement date. The swap is the charge or credit that results from the rollover. In practice, traders often refer to the charge or credit as either the rollover or the swap.
When does rollover happen? Rollover occurs at the broker’s daily cutoff time, typically around 17:00 New York time or 22:00 GMT. Any position open at that moment is rolled to the next settlement date and the corresponding swap is applied.
Can rollover be positive? Yes. If the currency you are long has a higher interest rate than the currency you are short, the rollover results in a credit to your account rather than a charge. This positive rollover is a key feature of carry trade strategies.
Why is Wednesday rollover larger? The Wednesday rollover is typically three times the standard daily rate because a position rolled on Wednesday settles for Friday, and the next business day after Friday is Monday. This covers three days of interest in a single rollover event.
Do day traders pay rollover? No. Rollover only applies to positions that are open at the daily cutoff time. Traders who open and close all positions within the same trading day before the cutoff avoid all rollover charges and credits.
How do I find the rollover rate for a pair? Rollover rates are typically available in the instrument specifications section of your trading platform. They are usually listed as the long swap rate and short swap rate for each pair. These rates change over time as central bank interest rates change, so it is worth checking current rates rather than relying on historical figures.