Swaps are one of the least understood costs in forex and CFD trading, partly because they’re invisible until you hold a position past a certain time of night. Close a trade the same day and you’ll never see one. Hold it overnight and a small charge, or occasionally a small credit, appears on your account. Over a single day it’s easy to ignore. Over weeks of holding, it adds up enough to matter.
The short version: a swap, also called a rollover fee, is an interest adjustment applied to positions held overnight. It comes from the interest-rate difference between the two currencies in a pair, it can be a charge or a credit depending on your direction, and it only applies to forex and CFD positions, not futures. Day traders who close before the daily rollover rarely deal with it; anyone holding overnight or over the weekend should understand it. Here’s how it works.
What a Swap Is
A swap is a type of interest charged or earned on a leveraged position held open past the broker’s daily rollover time. It’s applied to the nominal value of the position, so a larger position carries a larger swap. Depending on the rate and the direction of your trade, the swap can be negative, meaning you pay it, or positive, meaning you’re credited. In practice, because of the way brokers price it, a negative swap is the more common outcome.
Why Swaps Exist
Swaps trace back to two facts: you’re trading on leverage, and a forex trade is really two trades at once. When you open a leveraged position you’re effectively borrowing to fund it, and in forex specifically you buy one currency while selling another. You earn interest on the currency you hold and owe interest on the currency you’re effectively borrowing. The swap is the net of those two interest rates, the rate differential between the pair.
If the currency you bought has a higher underlying interest rate than the one you sold, the differential can work in your favor and produce a positive swap. More often, once a broker’s markup is added on top, the net lands negative regardless of direction. For instruments with a high cost of carry, like some commodities, swaps tend to be negative on both the long and short side.
Positive vs Negative Swap
The sign of the swap depends on the rate differential and your direction. Buy the higher-yielding currency and sell the lower-yielding one, and you may earn a positive swap. Take the opposite side and you’ll usually pay. This is the basis of the carry trade, a long-term approach that holds a higher-interest currency against a lower-interest one specifically to collect the daily positive swap. The catch is that an adverse price move can wipe out months of collected interest in a single session, so the swap is rarely a reason to hold a position on its own.
When Swaps Are Charged, and Triple Swap
The swap is applied once per day at the broker’s rollover time, commonly around midnight server time. Because the market is closed on weekends but interest still accrues, brokers compensate with a triple swap on one day of the week, usually Wednesday or Friday depending on the instrument and broker. Hold a position overnight on that day and you’re charged three times the normal swap to cover the weekend. The practical upshot is simple: if you close before the daily rollover, no swap applies at all, which is why intraday traders mostly avoid the topic.
How Swaps Are Calculated
The exact figure depends on the broker, the instrument, your direction, the nominal value, and how many days you hold. Brokers usually publish the rate per lot or in relation to the pip value of the position, and the daily charge works out to the swap rate multiplied by that value. The numbers are small on any given night, often a fraction of the position’s value, but they’re charged every day a position stays open, so the impact scales with how long you hold rather than how big a single move is.
Swap-Free (Islamic) Accounts
A swap-free account, often called an Islamic account, doesn’t charge or pay overnight interest. These exist because Islamic finance prohibits charging or earning interest, and many brokers and prop firms offer them. The trade-off is that swap-free accounts frequently replace the swap with a different cost, such as a flat administration fee after a position is held for a set number of days, though some carry no extra fee at all. If you’re considering one for long holds, read the terms to see what, if anything, takes the swap’s place.
How Swaps Differ in Futures
Futures don’t have a daily swap line at all. Instead, the cost of carry, which includes interest and storage, is built into the futures price across contract months, so a contract for a later month already reflects that cost rather than billing it to you each night. Holding a position long term means rolling from the expiring contract into the next one before expiry, rather than paying a nightly fee. The cost is still there, it’s just expressed through the price curve and the roll instead of an overnight charge. Our guide to futures versus CFDs covers more of these structural differences.
Why Swaps Matter in a Prop Account
For most evaluation strategies, swaps are a minor concern. Day traders and scalpers who flatten before the rollover never pay them, so the cost is effectively zero. Swing and position traders are the ones who need to plan for it, because every overnight and every triple-swap day adds to the running cost of the trade, and that cost counts toward your profit and loss and therefore toward your drawdown just like any other loss.
There are two prop-specific wrinkles. Because most prop accounts are simulated, the firm decides whether to apply swaps at all in its environment, and many forex and CFD firms offer swap-free accounts as standard. Separately, swaps are not the same as a weekend-holding rule: some firms prohibit holding positions over the weekend entirely, regardless of swap, so check the firm’s overnight and weekend policy before you build a strategy around holding trades.
How to Manage Swap Costs
If your strategy allows it, closing intraday sidesteps swaps completely. If you hold, fold the daily swap into your plan rather than treating it as a surprise, and avoid carrying a position into triple-swap day unless you mean to. For genuinely long holds, a swap-free account can help, as long as you’ve checked what replacement fee it carries. Above all, confirm your firm’s swap treatment and its weekend-holding rule before you rely on overnight positions, so the cost and the rules are both known going in.
Bottom Line
A swap is the overnight interest on a leveraged forex or CFD position, set by the rate difference between the two currencies, and it’s usually a small charge though occasionally a credit. It’s irrelevant if you close intraday and meaningful if you hold for days or over weekends, when triple swaps and compounding turn a trivial nightly figure into a real cost. Futures handle the same idea through the price curve and contract rolls instead. In a prop account, day traders can largely forget about swaps, while anyone holding overnight should know the firm’s swap treatment and weekend rule, and price the cost into every position they intend to keep.
Frequently Asked Questions
What is a swap or rollover fee?
It’s an interest adjustment applied to a forex or CFD position held open past the broker’s daily rollover time. Depending on the rate and your direction, you either pay it or, less often, earn it.
Why am I charged a swap?
Because a leveraged forex trade involves holding one currency and effectively borrowing another, you owe interest on one side and earn it on the other. The swap is the net of those rates, and a broker markup usually tips it into a charge.
What is triple swap?
To account for interest over the closed weekend, brokers charge three times the normal swap on one day of the week, usually Wednesday or Friday depending on the instrument. Holding overnight on that day means a triple charge.
What is a swap-free account?
A swap-free or Islamic account doesn’t charge or pay overnight interest, in line with Islamic finance rules. Many of these accounts replace the swap with a flat administration fee after a set holding period, though some have no extra fee.
Do futures have swaps?
No. Futures build the cost of carry into the price across contract months, so instead of a nightly swap you roll into the next contract before expiry. The cost exists but is expressed through the price curve rather than an overnight charge.
Do prop firms charge swaps?
It varies. Because most prop accounts are simulated, the firm decides whether to apply swaps, and many forex and CFD firms offer swap-free accounts as standard. Check the firm’s swap treatment, and separately its weekend-holding rule, before relying on overnight trades.