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 25. What is the definition of swaps? Why do Traders Hold Positions Overnight and How are Swap Rates Calculated When Trading Forex and Calculating the Rate for Forex?

A forex swap (or rollover rate) is an interest fee paid or earned for holding a trading position past 5:00 PM EST. Traders hold positions overnight to capitalize on multi-day technical trends, long-term fundamental forecasts, or to profit directly from the interest rate differential between the two traded currencies. [1, 2, 3, 4]



How Swap Rates Work


When you trade forex, you simultaneously borrow one currency to buy another. Since central banks pay interest on their respective currencies, holding an overnight position means you are either collecting interest on the currency you bought or paying interest on the currency you borrowed.
  • Positive Swap: If you hold a long position in a currency with a higher interest rate against a currency with a lower interest rate, you earn interest (a net credit to your account).
  • Negative Swap: If the currency you bought has a lower interest rate than the currency you borrowed, you pay the difference (a net debit from your account). [2]
How the Swap Rate is Calculated


While brokers automatically calculate and apply these values to your account, the daily overnight swap is fundamentally determined by the interbank borrowing costs and your broker's administrative markup. The general formula used to estimate the daily swap fee is: [3, 5, 6]


$\text{Swap} = \left( \frac{\text{Contract Size} \times (\text{Interest Rate Differential} \pm \text{Broker Markup})}{100} \right) \times \left( \frac{\text{Current Price}}{\text{Number of Days in Year}} \right)$


Where:
  • Contract Size: The total volume of your trade (e.g., $1 \text{ standard lot} = 100,000 \text{ units}$).
  • Interest Rate Differential: The difference between the target interest rates set by the central banks of the two currencies in your pair.
  • Broker Markup: Additional fees added by your broker (usually around $0.5\%$). [3, 5, 6, 7]
To explore live, broker-specific swap rates and calculate your potential overnight holding costs, check out dedicated educational tools and resources like Dukascopy's Forex Swap Guide or FP Markets Swap Rates Guide.





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