Originally Posted by tomvancouver

Your eups are initially taken out of your eup bank when you request the upgrade, but at the time you fly, they are redeposited, and any eups that are due to expire first are debited (i.e the rolled over ones, which are given an expiry date of Jan 15th, to distinguish them from the base eups which have a date of 16 Jan).
So you will be OK