Forex Swap Explained: Overnight Rollover Fees and Swap-Free Accounts

Forex is traded on margin, which means your broker is funding most of your position. Hold it past the daily cut-off and someone has to pay the interest on that money. That payment is swap, and it can quietly add or remove a meaningful slice of a swing trader's monthly profit.

What is a forex swap?

When you buy EUR/USD you are, in effect, borrowing dollars to buy euros. You pay interest on the dollars and earn interest on the euros. The net of the two, adjusted by the broker, is the swap, also called rollover or overnight financing. It is applied once a day, at the moment the trading day rolls over, which is 5pm New York time, 10pm in the UK for most of the year and 9pm during the weeks when the clocks are out of step.

• If the currency you bought pays a higher rate than the one you sold, you may receive swap.
• If it pays a lower rate, you pay swap.
• The broker adds a markup to both sides, so even on a pair with identical rates, both long and short swap are usually slightly negative.

Nothing is charged if you open and close within the same trading day. Day traders rarely see swap at all. Anyone holding for days or weeks sees it every night.

How swap is calculated

Brokers quote swap in one of two ways.

Swap in points

Most MetaTrader brokers list swap long and swap short in points, where a point is the last decimal of the quote (a pipette on a five-digit broker). The daily charge is:

Swap = swap points x lots x point value

Suppose EUR/USD shows swap long -7.2 and swap short +2.1. One point on one standard lot is $1 (a pip is $10, a point is a tenth of that).

• Holding 1 lot long overnight costs 7.2 x 1 x $1 = $7.20.
• Holding 1 lot short earns 2.1 x 1 x $1 = $2.10.
• On 0.1 lots the figures are 72 cents and 21 cents.

The positive side is almost always smaller than the negative side. That gap is the broker's margin.

Swap in percent

Some brokers quote an annual percentage of the position value. A rate of -2.5% on a $108,000 EUR/USD position is 108,000 x 0.025 / 365 = about $7.40 a night. Divide by 360 at some brokers. The result is in the same range as the points method; it is just stated differently.

The triple swap day

Spot forex settles T+2, two business days after the trade. A position held over Wednesday night is deemed to settle on Friday, and rolling it forward one day lands on Monday, which carries the interest for Saturday and Sunday too. So Wednesday's swap is three times the normal amount at most brokers.

Some brokers apply the triple day on Friday instead, and bank holidays in the US can move it. Check the specification. If you are paying $7 a night on a position, the Wednesday charge is $21, and a trader who closes at 9:55pm on Wednesday and reopens at 10:05pm has saved $14 for the cost of two spreads.

What swap does to a swing trade

Take a one-lot long on EUR/USD held for two weeks at -7.2 points a night. Ten trading nights, two of them triple:

• Eight single nights: 8 x $7.20 = $57.60
• Two triple nights: 2 x $21.60 = $43.20
• Total swap: $100.80

On a trade targeting 150 pips ($1,500) that is a 7% haircut. On a trade that limps to a 30 pip gain ($300) it is a third of the profit gone. The swing trading guide goes into how to budget for it; the short version is that swap belongs in the plan next to the spread, not as an afterthought when the statement arrives.

Compare the same two weeks on a pair with a positive carry in your direction and the position is paying you to hold it. That difference is the basis of the carry trade.

The carry trade

A carry trade buys a high-interest currency against a low-interest one and collects the swap, hoping the exchange rate does not move enough to wipe it out. When central bank rates are far apart, as between the yen and the dollar for much of the 2020s, the daily credit on the right side can be substantial on a large position.

Two warnings. First, the carry is small per day and the exchange rate risk is large per day. A year of positive swap on a yen pair can disappear in a week of yen strength, as happened in August 2024. Second, the broker's markup means you receive less than the true rate differential and pay more than it when you are the wrong way round. Carry works as a tailwind on a trade you would take anyway. It rarely works as the whole reason for the trade.

Our COT report is worth a look here: when speculators are crowded into a carry trade, the unwind tends to be fast.

Swap on gold and indices

Gold has no interest rate, so XAUUSD swap is pure financing: you pay the dollar rate plus markup to hold long, and both long and short are usually negative. On gold the nightly charge on one lot (100 oz at $2,650 is $265,000 of exposure) can be $20 or more. Indices and shares work the same way, financed at the relevant benchmark rate plus a markup. The gold trading strategy guide covers how this changes the maths for multi-week gold positions.

Swap-free accounts

Swap-free or Islamic accounts remove the interest element for traders whose faith prohibits it. Most brokers now offer them to anyone who asks, but they are not free. Typically there is a grace period of a few days, after which a fixed admin fee per lot per night applies, often at a level similar to or higher than the swap it replaces. Some brokers also widen spreads on swap-free accounts. For a position held three days they can be cheaper. For a position held three weeks they usually are not. Read the fee schedule, not the headline.

How to find your broker's swap rates

• MetaTrader 4 and 5: Market Watch, right-click the pair, Specification. Look for Swap Long, Swap Short, Swap Type (points or percent) and the 3-day swap day.
• cTrader: Symbol information panel.
• Broker website: most publish a full table under contract specifications, updated at least weekly as rates move.

Rates change whenever a central bank moves or the broker adjusts its markup, so the figure you saw last month may not be the one you are charged tonight. The economic calendar flags the rate decisions that move them.

The practical rules

1. Know your rollover time. 10pm UK for most of the year. Positions open at that moment are charged.
2. Check the swap before any multi-day trade. Points x lots x point value. Write the nightly figure in the plan.
3. Mind Wednesday. Three days of swap in one night.
4. Add swap to spread for the true cost. Spread is paid once, swap is paid nightly. Together they are what your edge has to beat. The spread guide covers the other half.
5. Treat positive carry as a bonus, not a strategy. The exchange rate is still the trade.

Swap will not make or break a good trader. It does separate the swing traders who know what their month cost from the ones who find out afterwards.