The hidden cost of holding overnight
If you hold a leveraged position past the daily cut-off (often around 5 p.m. New York time), most brokers apply a 'swap' or 'rollover' charge — a small daily fee (or occasionally a credit) for keeping the position open overnight. Over days and weeks, these charges quietly erode profits or deepen losses, even when the price itself has barely moved.
This is why a trade can look flat or slightly up when you go to bed and slightly down when you wake up. The market did not have to move; the swap was deducted.
Why swaps exist
Because you are effectively borrowing to hold a leveraged position, there is an interest cost, based on the difference between the interest rates of the two things you are trading (for a currency pair) or a financing rate (for indices, commodities and shares). Depending on direction, this can be a charge or, less commonly, a small credit.
Two quirks catch beginners out. Many brokers apply a 'triple swap' on one day of the week to account for the weekend, so that day's charge is three times the usual. And swaps are typically larger, and always charged, on some instruments more than others.
How to see and manage swaps
You can usually view the swap rates for each instrument in your platform's contract specifications, and the actual charges appear in your account history against each held position. Check them before you hold anything overnight, especially on the triple-swap day.
To manage them: prefer shorter-term trades that you close before the daily cut-off if swaps are eating your edge; factor the daily swap into any trade you plan to hold for days or weeks; and be aware that on some positions the overnight cost can quietly exceed the profit you were hoping for.
A note on "swap-free" accounts
Some brokers offer 'swap-free' or Islamic accounts that do not charge conventional swap. These can suit those who need them, but read the terms: brokers often replace the swap with an administration or holding fee, and there may be limits on how long you can hold. 'Swap-free' rarely means 'cost-free'.
The general takeaway: overnight costs are real and predictable. Once you know they exist and where to find them, they stop being a nasty surprise and become just another cost you plan around.