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Most people know about the daily rollover. Fewer notice that the last day of the month, and especially the last day of a quarter, can behave differently. Banks adjust balance sheets, and the demand for funding around those dates pushes forward points around. For a retail trader that mostly shows up as odd swap values on a given day, but it can also show up in spreads.

During those windows, the swap rates on a pair can jump to values that look like errors. A pair that normally charges 0.5 points can show 3 or 4 for one night, then return to normal.

There's also the matter of month-end flows in the real market. Large fund managers rebalance currency hedges, and the effect is concentrated into the London fix. That is a different topic, but the quote behavior that day around 4pm London is worth watching.

A scalper who isn't holding overnight can ignore most of it. But anyone running a trade that straddles the rollover timestamp on the last business day should look at the swap before pressing the button, since the platform shows the current figure in the symbol specification.

A good place to see the effect is the swap column on a position held across the last business day of a quarter, compared with the same position a week earlier. A tiny test position held over rollover on a demo or micro account makes the difference visible for the price of a few cents.

Has an unusual swap figure ever shown up in the trade history on a month-end?

The one that caught my attention was a small AUDJPY swing position held across the end of a quarter. The swap that night was several times the normal figure and in the wrong direction, so the position paid more in one night than it had earned in the previous week. I checked the broker's announcement afterwards, and they had in fact posted a note about the funding adjustment that I hadn't read.

Since then I look at the symbol specification on the last business day of every month for anything I'm planning to hold. It takes a minute, and if the swap looks unusual I either close before rollover or cut the size.

The month-end fix point is one I've seen in my own trading too. On the last day of the month, the half hour before 16:00 London often feels different on GBPUSD, with moves that don't fit the rest of the day. I don't trade into it any more, and I treat any level from that window with suspicion for the next morning.