Swap Rates, Rollover and the True Cost of Holding Positions
Every position you hold overnight generates a swap credit or charge. Over weeks and months, this hidden cost can meaningfully drag on your returns — or add to them if you understand carry.
What Is a Swap Rate?
A swap rate (also called rollover or overnight financing) is the interest credited or charged to your account when you hold a forex position open past the end of the trading day (5 PM New York time). It reflects the interest rate differential between the two currencies in the pair you are trading.
How Swaps Are Calculated
The swap is based on the overnight interest rate differential (usually the LIBOR/SOFR equivalent plus broker markup) between the two currencies. If you are long a high-interest currency and short a low-interest currency, you receive the swap (positive carry). If the reverse, you pay the swap (negative carry).
Example: AUD/JPY long. Australia's cash rate is 4.35%, Japan's is 0.1%. The differential is ~4.25% annually. Divided by 365, that is roughly 0.0116% per day. On 1 standard lot ($100,000 notional), that is approximately $11.64 per day in swap income — before the broker's markup.
Triple Swap on Wednesdays
Because the forex market does not settle on weekends, Wednesday's rollover accounts for three days of swap (Wednesday, Saturday, Sunday). Your platform will show three times the normal swap on Wednesday night. This is not an error — it is standard settlement convention.
When Swaps Become a Real Cost
For position traders holding trades for days to weeks, swaps become a meaningful P&L component. Negative swap pairs (typically USD longs against high-yielding currencies) accumulate daily charges that erode profit margins on smaller-winner strategies.
A strategy with a 20-pip average winner and a 5-pip daily negative swap effectively needs 25 pips of price movement to break even on a 5-day hold. This changes setup selection and holding period calculations significantly.
Swap-Free (Islamic) Accounts
Brokers offer swap-free accounts for traders whose religious beliefs prohibit interest. Instead of swap charges, these accounts may apply an administration fee after a certain number of days. The structure varies by broker. If swaps significantly impact your strategy, these accounts are worth comparing.
Swap is not background noise — it is a daily compounding cost or income that serious position traders calculate before taking any multi-day trade.