What a Swap Actually Is
A swap — also called a rollover or overnight financing fee — is the interest adjustment applied to a position you hold past the daily market cut-off (usually 22:00 UTC). Every forex trade is technically the purchase of one currency funded by the sale of another, and each currency carries its own interest rate. When you hold overnight, that interest-rate difference is credited to or debited from your account.
The result can be negative (you pay) or positive (you earn), depending on which currency you are long, which you are short, and the gap between their interest rates. On short intraday trades that close the same day, swaps do not apply — but on multi-day positions they add up quietly.
Open an Eightcap account or Pepperstone to see live swap rates in the platform before you trade; both display them per instrument.
Why the Fee Exists
Swaps are not an arbitrary broker charge — they reflect the real cost of carrying a leveraged currency position. Because you control a large notional amount with a small margin deposit, the broker effectively finances the rest, and the interest-rate differential between the two currencies is settled each night.
If you are long a currency with a higher interest rate against one with a lower rate, you may receive a positive swap. If you are long the lower-rate currency, you pay. Brokers also add a small markup to the raw interbank differential, which is why the debit is usually a little larger than the credit on the same pair.
How It Is Calculated
Swap is quoted per lot, per night, and shown separately for long and short positions. A worked example on one standard lot:
- EUR/USD, long, 1.0 lot: swap of −$6.80 per night. Holding for 4 nights costs about $27.20.
- EUR/USD, short, 1.0 lot: swap of +$1.20 per night. Holding for 4 nights earns about $4.80.
One quirk trips up beginners: triple swap Wednesday. Because spot forex settles two business days forward, the weekend's financing is booked in a single charge on Wednesday. So the Wednesday-night swap is usually three times the normal figure. Check your platform's swap table before holding over a Wednesday.
Positive Swap and the Carry Trade
When the swap is in your favour, holding the position pays you a small amount each night. Some traders build strategies around this — the "carry trade" — by going long a higher-yielding currency against a lower-yielding one and collecting the differential over weeks or months.
The catch is that the interest earned is tiny relative to the currency risk. A carry position can collect swap for months and then lose all of it in a single adverse move, because leverage amplifies the price risk far beyond the yield. Positive swap is a bonus on a well-chosen position, never a reason to hold a losing one.
Swap-Free (Islamic) Accounts
Most regulated brokers offer a swap-free or "Islamic" account for clients whose beliefs prohibit paying or earning interest. Instead of nightly swaps, these accounts typically charge a fixed administration fee on positions held beyond a set number of days. If you plan to hold longer-term positions and want predictable costs, it is worth comparing a swap-free structure against standard swaps.
How Swaps Fit Your Total Cost
Swap is the third cost of trading, alongside the spread and any commission. For a scalper it is irrelevant; for a swing or position trader it can dwarf the spread. Always add it to your all-in cost the same way you would compare spread vs commission or shop for the lowest-spread forex brokers. Because swap scales with position size and leverage, it also ties directly to how leverage works — a larger position pays a larger nightly swap.
If you are learning to read costs in the platform, our tutorial on how to read forex spreads shows where the swap column lives, and you can compare regulated brokers in our forex brokers category.
The Bottom Line
Swaps are small per night but compound on longer trades, and the triple-Wednesday charge catches people out. Before holding any position overnight, open the platform's swap table, check both the long and short figures, and factor them into your expected return. For the funding-rate equivalent in crypto markets, our sister site covers it in best crypto exchanges, and YieldNav explains how interest-rate differentials drive returns in traditional investing.
Risk warning: CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. A majority of retail investor accounts lose money when trading CFDs — commonly disclosed at between 51% and 89%. Swap rates change with central-bank policy, capital is at risk, and availability varies by country.
This article is for informational and educational purposes only and does not constitute financial advice. Verify current swap rates directly with your broker before holding positions overnight.