Direct answer
In forex, “swap” usually means a rollover or overnight carry adjustment applied to an open position when it is held beyond the broker’s daily cutoff time. If the position is closed before that cutoff, swap may not apply (or may apply differently). Swap is commonly shown as a daily charge or credit and may be positive or negative depending on the trade direction and the currencies in the pair.
Explanation: what swap is and how it works
Forex trades currencies in pairs (for example, Currency A versus Currency B). Even though most retail platforms show a price move as “buy” or “sell,” holding a position overnight is treated like keeping exposure to both currencies for longer than one trading day.
Swap is meant to reflect the cost or benefit of that overnight carry, which is often tied to the interest-rate differential between the two currencies in the pair. In simplified terms:
- If the interest-rate differential favors the side of the position, swap may be credited.
- If it does not favor the position, swap may be charged.
Swap is therefore not the same as a one-time transaction cost like a commission. It is typically time-based, changing with holding time and sometimes with day-to-day market conditions.
Whether swap is charged or credited can also depend on the direction of the trade:
- A “long” position means you hold one currency (buy) against the other.
- A “short” position means the opposite exposure. Because swap is linked to which currency you effectively hold longer, long and short positions can have different swap outcomes on the same pair.
Example checks and how to verify independently
Because swap details depend on the broker and the specific trading instrument, the most reliable verification is to check the contract specifications in your trading platform or account terms. Look for fields such as:
- Swap, rollover, or overnight fee for the instrument
- Whether the swap is listed per day and how it is applied
- Any notes about weekend or rollover timing (for example, swap treatment can differ on days when markets are closed)
You can also cross-check your expectation by comparing:
- Your position’s holding time relative to the daily cutoff
- Whether the broker calculates swap in a specific currency (or converts it)
Finally, if the platform distinguishes between swap for “long” and swap for “short,” use that information directly rather than assuming the sign.
Relevant limitations and risks
Swap meaning is conceptually clear, but the exact amount and sign are not universal across brokers. They depend on broker-specific terms, the instrument’s contract rules, and operational details such as the daily cutoff and rollover conventions. Also, swap is uncertain in the sense that it can vary over time and with market and account conditions.
This article explains the general concept of swap in forex, but it does not provide real-time figures, broker-specific calculations, or guarantees about future costs or credits. For any decision involving swap, you should use the swap/rollover information displayed in your own account for the exact instrument and conditions you are trading.
Limitations of this explanation
General explanations like this describe how swap typically works. Exact definitions and implementation can differ by provider, account type, and instrument. Where you need certainty, confirm using your platform’s swap/rollover details and the account’s terms and conditions.