Short answer
A swap is an overnight fee that applies when a trade is held open past the daily rollover time. It reflects the cost of holding a position overnight and is based on interest rate differences, instrument rules, and market conditions.
What is swap in trading?
Swap is the overnight adjustment applied to open positions.
If you open and close a trade within the same trading day, no swap is charged.
If the position remains open after rollover, a swap is applied automatically.
Swap can be:
- negative (a fee)
- positive (a small credit)
When is swap applied?
Daily rollover time
Swap is applied once per day at the broker’s rollover time (usually late evening platform time).
At rollover:
- the trading day is considered finished
- all open positions are carried to the next day
- swap is added or deducted
Triple swap day
On one specific weekday, swap is charged three times.
This happens because:
- markets are closed over the weekend
- three days of holding are accounted for at once
The exact day depends on the instrument.
Why does swap exist?
Swap exists because trading instruments are linked to real markets.
When you hold a position overnight, you are effectively:
- borrowing one currency
- lending another
- or holding a leveraged position
The swap reflects:
- interest rate differences
- funding costs
- market conventions
This is standard market mechanics, not a penalty.
Why swap amounts can differ
Swap size depends on several factors:
- the instrument you trade
- whether the position is Buy or Sell
- current interest rates
- market liquidity
- broker conditions
This is why swap values can change over time.
The illustration shows how swap is applied when a trade is held overnight.
Why this matters for traders
Understanding swap helps traders:
- avoid unexpected overnight costs
- plan holding periods correctly
- understand why profit changes without price movement
- choose appropriate strategies for short-term vs long-term trading
Many “mysterious losses” are simply swap fees.
H2: What’s next
Next article:
Why do prices and spreads differ between brokers?
This explains liquidity, pricing sources, and execution differences.
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