What are overnight swap or rollover fees at forex brokers?

Overnight swap or rollover fees are interest adjustments applied when you hold a forex position past the broker’s daily cutoff time. Each currency in a pair has an underlying interest rate; when you buy one and sell the other, you effectively borrow in one currency and lend in the other. The broker passes on the net interest difference, minus or plus its own markup, as a fee or credit. Depending on the pair and the direction of your trade, you may either pay or receive a swap. These amounts can add up over time, especially on highly leveraged or long‑term positions, and are often tripled on a specific weekday to account for the weekend. Checking your broker’s swap table helps you understand the ongoing cost of holding trades overnight.