Why one night is charged three times
Forex trades settle two business days forward, so a position held over Wednesday night settles on Friday, while one held over Thursday night settles on Monday — crossing the weekend. To cover those two extra days a triple swap is charged on a single night, which for most forex brokers is Wednesday.
That is why a trader holding for a few days finds a Thursday debit three times the usual size. The number is not an error, and the tripled night can differ by asset and by broker, so confirm it in the contract specifications.
When swap becomes a decision, not a detail
A position closed the same day incurs no swap at all, which is why it means nothing to scalping. On a style that holds for weeks it can move from a marginal line item to the factor that decides whether the strategy is profitable.
The practical rule: compute expected swap against the profit target before entry, not after. If swap eats a meaningful share of the target, the trade needs either a further target or a shorter horizon. See swing trading.
Where this cost sits in the stack
The cost of a trade is not one number but a stack: the spread is paid once on entry, slippage may be added on entry and again on exit, and swap repeats every night. Liquidity and volatility are not direct costs, but they set the size of the first two layers.
Measure the spread alone and the trade looks like it costs $3; held over three nights the real figure is closer to $9.50. That gap is not an accounting detail: if you risk 1% of a $1,000 account — $10 — the stack has consumed almost the entire trade before price has moved at all.
The formula
Approximate swap = position size × swap points × nights held (with one night charged ×3)
A worked example
On the reference account — 0.10 lots of gold — assume a swap of $1.50 per night on the buy side. Held three nights that is $4.50, and if the tripled night falls inside those three it becomes $7.50.
Set against 1% risk on a $1,000 account — $10 — swap alone has consumed half to three quarters of the risk before price has moved. Add spread and slippage and the full cost approaches $9.50, effectively the whole trade.
Common mistakes with this term
- Ignoring swap on longer-horizon strategies because the nightly figure is small, when it compounds.
- Treating the triple charge as a broker error, when it covers weekend settlement.
- Assuming a positive swap is guaranteed income, when it moves with interest rates and can turn negative.