Rollover and Swap: The Cost of Holding Positions Overnight
Rollover is the process of extending an open position to the next day, and swap is the interest cost or credit applied for doing so.
Rollover and Swap: The Cost of Holding Positions Overnight
When you hold a leveraged position overnight, the trade does not simply pause until morning. The broker rolls it forward to the next trading day and applies a small interest charge or credit called the swap. Together, rollover and swap represent the cost (or benefit) of holding a position across the day boundary.
What Is Rollover?
Rollover is the process of closing your current position at the end of the day and simultaneously opening an identical one for the next day. In practice this happens automatically — your position stays open, but the settlement date moves forward. In forex, the standard settlement is T+2 (two business days). To avoid taking physical delivery of a currency, your broker rolls the position each night.
What Is the Swap?
The swap (or financing charge) is the interest you pay or receive for holding a leveraged position overnight. It is based on the interest rate difference between the two currencies in a forex pair. Buy the higher-yielding currency and you typically receive swap (positive); buy the lower-yielding currency and you typically pay swap (negative). For other leveraged instruments like CFDs on stocks or indices, brokers charge daily financing based on a benchmark rate plus a spread.
How Swap Is Calculated
A simplified forex swap formula:
Swap = (Position size) × (Swap rate) × (Number of nights)
Swap rates are quoted in pips or as a percentage and vary by broker — usually smallest for liquid pairs and largest for exotics. Example: you hold 1 standard lot of EUR/USD overnight; if the swap rate is -2 pips, you pay about $20 for one night.
Triple Swap on Wednesdays
A quirk of forex rollover: Wednesday is typically "triple swap" day. Because forex settles T+2, positions held open on Wednesday settle on Friday, and the weekend counts. Brokers apply three days of swap on Wednesday to cover Saturday and Sunday. Holidays can also produce triple swap on different days.
Why Swaps Matter
For short-term trades, swap costs are small but they compound quickly. Holding for weeks means swap can exceed the spread you paid to enter; carry trades aim to collect positive swap over time; long leveraged positions slowly bleed if swap is negative; and brokers charge different swap rates for the same pair. Typical impact runs from none intraday and small overnight, to noticeable over a week, significant over a month, and able to exceed spread costs over three months.
How to Reduce Swap Costs
To reduce swap costs, close positions before the daily cutoff (usually 5 PM New York time), avoid triple-Wednesday holds unless your thesis justifies it, compare broker swap rates (some are far cheaper), hold the higher-yielding side of a pair when possible, and consider swap-free accounts if available. Rollover and swap are the price of holding a leveraged position across the day boundary — small per night but accumulating over longer holds.