Swap Fees Explained: What You Pay (or Earn) to Hold a Trade Overnight

If you have ever opened a trade, left it running overnight, and noticed a small debit or credit appear on your account the next morning, you have met the swap fee. It is one of the least understood line items on a retail trading statement — partly because it is invisible during the day, and partly because it can go either way depending on the pair, the direction, and the day of the week.

Swap is not a broker markup dressed up in jargon. It is the cost — or the benefit — of financing a leveraged position across the daily settlement cut. Understanding where the number comes from makes it much easier to plan trades that stay open for more than a session, especially in a week like this one, where the PMI calendar runs from Tuesday through Wednesday across Australia, the eurozone, and the UK, and many traders will be sitting on positions across two or three rollovers.

What the Swap Actually Pays For

When you trade a currency pair on margin, you are effectively borrowing one currency to buy another. In EURUSD, going long means you are notionally holding euros funded by borrowed dollars. Going short means the reverse — you are holding dollars funded by borrowed euros.

Each of those currencies has its own overnight interest rate, set by its central bank and reflected in short-term money-market rates. The swap is the net of those two rates, applied to the notional value of your position, and adjusted for the broker's financing spread.

If the currency you are long pays a higher overnight rate than the currency you are short, the swap is typically positive — you receive a small credit. If the reverse is true, the swap is negative — you pay. The direction of the trade matters as much as the pair itself. The same EURUSD chart, held long or short, can produce swaps of opposite signs.

On instruments other than FX — indices, commodities, crypto CFDs — the swap works on the same financing principle, but the reference rate is usually a benchmark rate plus a spread, since there is no second currency to net against.

The Rollover Cut and the Triple-Swap Day

Swap is applied once per trading day, at the daily rollover — typically 00:00 server time on most CFD platforms. If your position is open when the clock ticks over, you get charged (or credited) for one day. If you close before rollover and reopen after, you skip it.

There is one wrinkle every trader eventually meets: the triple-swap day. Because value dates on FX settle two business days forward, positions held over a weekend need to be financed for Saturday and Sunday as well. Most brokers, including us, book that three-day charge on Wednesday night — the rollover that covers Thursday's value date, which lands on Monday.

So a Wednesday-to-Thursday hold picks up three days of swap in one hit. For a negative-swap pair, that can be the single biggest overnight cost of the week. For a positive-swap pair, it is the single biggest credit. Traders planning entries around Wednesday's flash PMIs should be aware of this — a trade opened Wednesday morning and held into Thursday will settle three days of financing, not one.

A Worked Example (For Illustration)

Assume — purely for illustration — a trader goes long 1 standard lot of a hypothetical FX pair where the long-currency overnight rate is 4.50% and the short-currency rate is 1.00%. Notional exposure is $100,000.

The raw rate differential is 3.50% per year. On $100,000, that works out to roughly $9.60 per day of positive carry before the broker's financing spread. After a typical financing spread of, say, 0.75%, the net might be around $7.50 per day credit.

Now flip it. The same trader goes short the same pair. Now they are paying the 4.50% side and receiving the 1.00% side — a negative 3.50% differential before spread, and after the broker's financing spread is added against them (it always widens the cost for the client, in either direction), the daily debit could be around $11.60.

Over a five-day hold that spans a Wednesday triple-swap, the long trader collects roughly $52.50 in swap credit (four normal days plus three-day Wednesday minus one). The short trader pays roughly $81.20. On a position sized at 1 lot with, say, 100 pips of price movement, that is meaningful — swap can eat 8-10 pips of a winning short, or add the same to a winning long. The numbers here are illustrative only; live swap rates change as central-bank rates and money-market spreads change, and are published on the instrument specifications page.

Why Swap Rates Move — and Where to Check Yours

Swap rates are not fixed. They move whenever the underlying interest-rate differential moves, which means every central-bank decision, every shift in short-term money-market rates, and every change in a broker's financing spread flows through to the number you see on your ticket.

That is why traders holding carry-style positions across a central-bank week can see their swap credit shrink — or a swap debit deepen — even though the pair itself has not moved. A pair that paid positive swap six months ago can pay negative swap today if the rate differential has narrowed or flipped.

Every instrument we offer has its current long-swap and short-swap values published on its contract specifications page inside the platform. Those figures are the definitive numbers for that trading day. If you are planning to hold a position for more than a session or two, it is worth checking both sides of the swap before you open the trade — not after.

One Takeaway

Swap is not a trap and not a bonus — it is the financing cost of running a leveraged position past the daily cut. For intraday traders who close everything before rollover, it does not exist. For swing traders holding positions across a week, it can quietly become the second-largest line item on the statement after the spread.

The practical habit: before you open any position you might hold overnight, check both the long-swap and short-swap for that instrument, note whether Wednesday falls inside your intended hold, and size accordingly. That single check turns swap from a mystery line item into a number you have already accounted for.