Swap Rate and Rollover: The Overnight Cost Most Traders Underestimate
Macro Glossary, Forex Mechanics
By Ken Chigbo, macro trader and founder of KenMacro, 18+ years in markets.
Updated 2026-05-20
The desk’s answer
Swap rate (also called rollover) is the interest debited or credited to a forex position held past the broker’s rollover cut-off, typically 22:00 UTC. It reflects the overnight interest rate differential between the two currencies plus the broker’s markup. Long a high-yield currency against a low-yield one earns swap; the reverse pays swap. Triple swap is charged on Wednesday to cover the weekend (Saturday and Sunday). For positions held more than a few days, swap can dwarf the spread as a cost.
Defined term, Swap rate (rollover)
The swap rate, also called rollover, is the interest debited or credited to a forex position held past the broker’s daily rollover time (typically 22:00 UTC). It is calculated from the overnight interest rate differential between the two currencies in the pair plus the broker’s markup, and applied per lot per night, with a triple swap charge on Wednesday to cover the weekend.
How swap is calculated
The theoretical swap on a forex pair is the overnight rate of the base currency minus the overnight rate of the quote currency, expressed per lot. Long EUR/USD with the ECB at 3.50 percent and the Fed at 5.25 percent has a theoretical short-side return: paying USD funding (5.25 percent) and receiving EUR funding (3.50 percent), a 1.75 percent annualised cost on a 100,000 euro notional, roughly 4.80 dollars per night per standard lot. Brokers add their markup to the bid and ask sides, which is why most retail traders pay swap on both directions, not just the wrong side of the rate differential.
Triple swap and the weekend
Forex positions accrue interest seven days a week even though the market is closed Saturday and Sunday. Brokers charge three days of swap on Wednesday (the rollover that funds the upcoming weekend), so a Wednesday rollover bills Wednesday plus the two weekend days. This is mechanical and visible in the swap-rate schedule on every broker. For multi-day holders the Wednesday triple bill is the single largest day of swap and can be a meaningful fraction of weekly profit and loss on a leveraged position. Some brokers shift the triple to Friday in special weeks.
Reading swap as a real trading cost
On a standard lot held for a week, swap can equal or exceed the spread paid on entry. Carry strategies depend on collecting swap on the right side. Most retail traders ignore swap because the per-night number is small, but a 5-pip-equivalent per night on a 50-pip-stop trade held for two weeks is 70 pips of cost, larger than most edges. Swap-free Islamic accounts (offered by many brokers) zero out swap but typically widen the spread and add an administration fee to compensate, which the desk verifies on a funded account before assuming it is a free option.
Frequently asked
What is the swap rate in forex?
The swap rate is the interest debited or credited to a forex position held past the broker’s daily rollover cut-off, typically 22:00 UTC. It reflects the overnight interest rate differential between the two currencies in the pair plus the broker’s markup, applied per lot per night.
Why is there a triple swap on Wednesday?
Because forex positions accrue interest seven days a week even though the spot market is closed Saturday and Sunday. Brokers charge three days of swap on Wednesday’s rollover to cover the upcoming weekend, so Wednesday is the heaviest swap day for multi-day holders.
Can I avoid paying swap?
Yes, by closing positions before the broker’s rollover cut-off, by trading swap-free Islamic accounts (which usually carry wider spreads or admin fees), or by being on the receive side of the rate differential. For active intraday traders swap is rarely a meaningful cost; for swing and position traders it can be.
What this means at the desk
Add swap to the cost stack alongside spread and slippage when sizing a multi-day hold. Wednesday is the heaviest day.
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Knowing the term is step one. The next question is always which broker actually serves you well. The desk audits eight brokers on regulation by entity, true cost, and honest fit, with the regulatory caveats the comparison sites bury.
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