How do I calculate the rollover adjustment? The Rollover adjustment can only be calculated at the time the rollover occurs. You can find more information, including rollover dates and calculation information, on our CFD Rollover page. Related articles Where can I see spread sizes? What is the minimum trading volume required before I can withdraw my bonus? What happens to my position when there is a contract rollover? Where can I see my trading history? How is the usable margin calculated?