A swing trader holds a short position for eleven nights, closes it 40 pips in profit and finds the account up considerably less than the pip count suggests. The missing amount sits in the account history under a line most people never open: swap. On a pair with a wide rate gap and a size of a few lots, eleven nights of financing is not a rounding error.
What the charge is for
A spot forex trade is an agreement to exchange two currencies with settlement two business days forward. Retail traders do not want settlement, they want the price exposure, so the broker rolls the position: the near contract is closed and reopened at the next value date. That roll has a price, because the two currencies pay different interest rates over the period.
Directionally the logic is simple. Being long a pair means holding the base currency and owing the quote currency. If the base pays more interest than the quote, the differential favours you and the position may be credited. If it pays less, you are debited. That mechanism is the whole basis of the carry trade, and on a leveraged retail account it works in miniature every night.
Where the broker's number comes from
Two components. The first is the market differential, taken from tomorrow-next swap points quoted in the interbank market, which move with policy rates and with month-end and year-end demand for balance sheet. The second is the broker's markup, applied to both sides. Because the markup is applied to the long swap and the short swap, the pair of numbers is usually asymmetric: a small positive differential shows up as a small credit one way and a larger debit the other.
Instruments other than currency pairs work slightly differently. On indices and commodity CFDs, the financing is typically built from a reference rate for the currency of the instrument plus a spread, applied to the notional value. Gold behaves like a dollar-funded position for this purpose, so a long position carries a financing cost that scales with the size held and the prevailing dollar rate.
The triple charge, and other calendar traps
| Night | Financing applied | Reason |
|---|---|---|
| Monday to Thursday | One day | Standard roll to the next value date |
| Wednesday for most FX pairs | Three days | The roll crosses the weekend under two-day settlement |
| Friday for many index and commodity CFDs | Three days | Different settlement convention on the underlying |
| Around public holidays | Varies | A closed settlement market pushes the value date further out |
Triple swap night is the one that surprises people. A carry-negative position opened on a Wednesday afternoon and held for eighteen hours can pay three days of financing for what feels like an overnight trade. It cuts both ways: a carry-positive position collects three days as well, though the markup usually removes most of the benefit.
The same window carries a second cost. Liquidity thins around the rollover and spreads widen for a few minutes, which matters for stops sitting close to price. We cover the behaviour in spread widening at rollover, and it is worth knowing the exact rollover time your broker uses, since it is a server time rather than your local one.
Swap rates are not fixed. Brokers revise them as policy rates and market funding conditions change, sometimes with little notice. A position sized on last month's financing cost can be paying a different rate today, so check the current figures rather than a saved screenshot.
Reading the number before you hold
Every platform exposes swap per lot per night in the instrument's specification, quoted either in points or directly in the account currency. Do the arithmetic before opening a position you intend to hold: multiply the per-lot figure by your size, then by the number of nights you expect to be in, and add a triple night if a Wednesday falls inside the window. Compare that total against the profit target. If financing eats a fifth of the target, the trade needs a different timeframe or a different instrument.
This changes strategy selection more than most traders expect. Intraday methods pay nothing, which is one genuine advantage of day trading over swing trading on carry-negative pairs. Position traders holding for months have to treat financing as a fixed cost of the idea, priced in at entry, in the same way a business prices rent.
From the operator's side the same line is a revenue decision. Swap markup is configured per instrument and per account group, sits alongside spread markup and commission, and is one of the few charges a client rarely compares before opening an account. Firms that set it aggressively find out later through complaints from swing traders, which is why the sensible default is a modest markup and a published table rather than a number buried in the contract specification.
Swap-free accounts and what replaces the charge
Accounts offered for religious compliance remove the interest component. What usually replaces it is an administration fee per lot per night, frequently after a grace period of a few days, and the fee does not vary with the rate differential. On a pair where the standard swap is deeply negative the swap-free version can be cheaper; on a pair with a small or positive swap it is usually more expensive. The conditions vary by firm and by instrument, and are set out in Islamic account rules.
One warning applies to every version. Some firms restrict swap-free status to certain instruments or withdraw it if the account is used mainly to farm the exemption on high-carry pairs. Read the account terms rather than the marketing page, because the exclusions are where the operational reality lives.
"If a trader cannot tell me the swap on the pair they are about to hold for a month, they do not know the cost of their own idea. It takes ten seconds to look up and it changes the answer more often than people think."
— Alex Onta, Executive Director, SINGUARD
Key Takeaways
- Swap is the cost of rolling a position to the next value date, built from the interest rate differential plus the broker's markup.
- Most currency pairs charge three days of financing on the Wednesday roll; many index and commodity CFDs use Friday instead.
- The charge scales with notional size, not with margin, so higher leverage does nothing to reduce it.
- Swap-free accounts substitute a flat administration fee, which can be cheaper or dearer than the standard swap depending on the pair.
Frequently Asked Questions
Why is the swap charged three times on Wednesday?
Spot foreign exchange settles two business days forward. A position held over Wednesday night rolls to a settlement date that falls after the weekend, so three days of financing are applied in one charge. Some instruments use a different triple day, and holidays can shift it, which is why the broker's contract specification is the source to check.
Can a swap be positive?
Yes. If the currency you are long carries a higher interest rate than the one you are short, the differential works in your favour and the position may be credited. The broker's markup is deducted from that credit, so a small differential often nets to a debit on both sides of a pair.
Do swap-free accounts remove the cost of holding?
They remove the interest component for religious compliance reasons and usually replace it with an administration fee, often after a grace period of a few days. The fee is a fixed amount per lot per night rather than a rate differential, so it can be higher or lower than a standard swap depending on the instrument.