Forex Swap
What Is a Forex Swap?
A Forex Swap (or Rollover) is the interest paid or earned for holding a currency position overnight. It represents the difference in interest rates between the two currencies in the pair, adjusted for broker fees.
In the spot forex market, trades technically take 2 days to settle (T+2). However, most traders are speculators who never intend to take physical delivery of 100,000 Euros. To prevent this delivery, brokers automatically "roll over" open positions at the end of each trading day (5:00 PM New York time) to the next settlement date. This rollover is not free. Since you are effectively borrowing one currency to buy another, you have to deal with the interest rates set by the central banks of those currencies. The **Swap** is the net interest calculation. * **Long EUR/USD:** You bought Euros (earning Euro interest) and sold Dollars (paying Dollar interest). * **Short EUR/USD:** You sold Euros (paying Euro interest) and bought Dollars (earning Dollar interest).
Key Takeaways
- Swap occurs when a position is held past the daily rollover time (5 PM EST).
- You earn interest on the currency you bought and pay interest on the currency you sold.
- If the rate you earn is higher than the rate you pay, you get a "Positive Swap" (credit).
- If the rate you pay is higher, you get a "Negative Swap" (debit).
- Wednesday is "Triple Swap Day" to account for the weekend settlement.
How Forex Swaps Work
The swap formula is simple in principle but adjusted by brokers. **Swap = (Interest Rate of Base Currency - Interest Rate of Quote Currency) - Broker Markup** * **Positive Swap (Positive Carry):** If you are Long a high-interest currency against a low-interest currency (e.g., Long USD/JPY when US rates are 5% and Japan is 0%), you *earn* money every night. * **Negative Swap (Negative Carry):** If you are Short that same pair, or if the interest differential is smaller than the broker's fee, you *pay* money every night. Because brokers add a markup to spread costs, it is common to see negative swap rates for *both* Long and Short positions on many pairs.
Triple Swap Wednesday
Forex markets are closed on weekends, but banks still charge interest on Saturday and Sunday. To account for this without opening the market, the industry charges 3 days' worth of swap on **Wednesday**. Why Wednesday? A trade opened Wednesday settles Friday (T+2). If you roll it over, the new settlement date jumps to Monday. That jump covers Friday, Saturday, and Sunday. Traders engaging in the "Carry Trade" love holding positions on Wednesdays to capture this triple payout.
Real-World Example: Calculating Swap
Interest Rates: USD = 5.0%, JPY = 0.0%. Broker Markup = 0.5%.
FAQs
No. Mathematically, one side pays and the other earns. However, due to broker markups/fees, it is very common for swap to be *negative* on both sides (you pay to hold Long, and you pay to hold Short).
Your trading platform (like MetaTrader 4/5 or cTrader) lists the "Swap Long" and "Swap Short" values in the contract specifications for each pair. These rates change frequently based on central bank policies and interbank liquidity.
No. If you open and close your trade within the same trading day (before 5 PM EST), the position never rolls over, and you pay zero swap. Swap only applies to overnight positions.
The Bottom Line
The Forex Swap is an often-overlooked cost (or bonus) of trading. For day traders, it is irrelevant. For swing and position traders, it is critical. A negative swap can slowly bleed a profitable trade dry over weeks, while a positive swap ("positive carry") can add a significant yield to the capital appreciation, acting as a tailwind for the trade. Smart traders always check the swap direction before holding a trade long-term.
Related Terms
More in Forex Trading
At a Glance
Key Takeaways
- Swap occurs when a position is held past the daily rollover time (5 PM EST).
- You earn interest on the currency you bought and pay interest on the currency you sold.
- If the rate you earn is higher than the rate you pay, you get a "Positive Swap" (credit).
- If the rate you pay is higher, you get a "Negative Swap" (debit).