What Is a Swap/Overnight Cost in Forex?

A swap, also known as an overnight cost or rollover, is a financing adjustment applied when a forex or CFD position remains open beyond the broker’s daily rollover time.

In forex trading, each currency has an interest rate associated with it. Because currencies are traded in pairs, holding a position means simultaneously buying one currency and selling another.

The difference between the interest rates of those two currencies, together with the broker’s pricing conditions, can result in either a charge or a credit being applied to the trading account.

Key Takeaways

• A swap is an overnight financing adjustment applied to positions held past the broker’s rollover time.
• Swaps can be either positive or negative.
• The amount depends on the currency pair, trade direction, interest-rate differential, and broker conditions.
• Swap is generally more relevant to swing and position traders than to day traders.
• Several days of swap may be applied at once on a triple-swap day.
• Traders planning to hold positions overnight should check the applicable swap rates before entering a trade.

How Does Swap Work?

Swap depends on three main factors: the currency pair, the direction of the trade, and the broker’s trading conditions.

If you are holding the currency with the higher interest rate and selling the one with the lower interest rate, you may receive a positive swap. If you are holding the lower-interest-rate currency and selling the higher-interest-rate one, you may pay a negative swap.

For example, if a trader keeps a EUR/USD position open overnight, the swap will depend on the interest rate difference between the euro and the US dollar, as well as whether the trader is buying or selling the pair. The same pair can have a different swap for long and short positions.

Is Swap Always a Cost?

No. Swaps can be either positive or negative.
A positive swap means the adjustment is added to your account. A negative swap means the adjustment is deducted from your account.

The actual price movement of the trade is usually far more important than the overnight adjustment. A position may earn a small positive swap but still lose money if the market moves against it.

Why Overnight Costs Matter

Swap matters most for traders who hold positions for longer than one trading day, and that’s why swap should be considered before entering a trade, not after the position has already been open for several nights.

A trade that looks profitable on the chart may become less attractive once overnight costs are included.

Spread vs Swap

Both spreads and swaps affect a trade’s pricing, and traders should be aware of both before entering a position. However, which one has more impact on your trades depends on your time orientation.

Short-term traders, like day traders, for instance, will barely notice swaps, because they tend to close their positions before rollovers happen. For long-term traders, like swing and position traders, spreads aren’t as noticeable, while swaps can accumulate over the course of a longer position and significantly affect the outcome.

What Is Triple Swap?

Another thing traders need to be aware of are triple swaps.

Because forex markets close over the weekend, brokers usually apply three days’ worth of swap on one specific weekday, commonly Wednesday. This is known as triple swap day.

On that day, the overnight adjustment can be much larger than usual. Traders who hold positions overnight should check their platform or contract specifications to understand when triple swap applies.

Conclusion

In simple terms, swap is the overnight financing adjustment for holding a forex position beyond the trading day. It can work for or against the trader, but it should always be part of the plan before deciding to hold a trade overnight.

Before keeping a trade open overnight, traders should check the current swap rate, the broker’s rollover time, and whether a triple-swap day is coming.