Direct answer to the question
Forex swap fees can change over time, and they often vary as underlying interest-rate inputs and broker calculations move. However, “change daily” is not guaranteed as a rule: whether you see a different swap fee each day depends on the rate updates and the broker’s calculation and posting schedule.
How a forex swap fee works
In many forex accounts, the swap fee (also called rollover or overnight financing) is the cost or credit for holding a position overnight. Conceptually, it is linked to the interest-rate differential between the two currencies in the pair.
Because those interest-rate differentials are driven by benchmark rates, they can change when markets reprice interest expectations or when scheduled rate changes occur. Even if the market moves, a specific broker may not update the displayed or posted swap value at the same frequency as the underlying benchmarks.
Also, brokers may apply additional rules from the contract terms of the instrument you trade, such as:
- how they compute the overnight portion,
- whether the swap is charged/credited on specific days,
- and how they handle rollovers around weekends.
So the swap fee is “dynamic,” but the visible change frequency (daily versus less frequent) is partly an operational detail.
Example checks you can run
If you want to verify how it behaves on your account, use comparisons rather than assumptions:
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Compare the swap amounts across multiple consecutive settlement days for the same instrument and position direction. Note whether both the sign (cost vs credit) and magnitude change.
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Compare overnight swap postings right after major calendar events (for example, days when interest-rate related benchmarks move). If inputs shifted, your swap cost may shift too.
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Check whether your broker treats rollover differently around weekends. Swap postings can reflect more than one day of holding in practice, which can make a “daily” pattern look inconsistent.
These checks help distinguish “swap changes because inputs changed” from “swap posted on a different schedule.”
Limitations and uncertainty
- This explanation does not assume any real-time data for your broker or your account.
- You cannot infer future swap behavior from past values alone; the underlying inputs and calculation rules can change.
- The exact frequency and method of updating swap fees are contract- and broker-specific, so the only fully reliable way to confirm “daily change” for your situation is to observe your own posted swap amounts over time.