Why are triple swaps charged on Wednesdays?

Triple swaps (or rollovers) are applied on Wednesdays to account for the weekend settlement cycle in global markets. In forex and many CFDs, positions settle on a T+2 basis (two business days later). When a trade is rolled over from Wednesday to Thursday, the settlement date skips ahead three days (Friday → Monday), since banks don’t process settlements on Saturdays and Sundays. To cover these two additional days, brokers and platforms apply three days’ worth of swap charges or credits on Wednesday night. This ensures weekend interest is fairly included, even though markets are closed.