The mystery from today?s picture refers to just past weeks. It is clear that Felix (the accountant) is not yet back from his christmass holiday leave this year. Very well! December is a favourite month among accountants. Only those have a problem who work for large companies and have to prepare reports rights after the month-end. January or December without distinction, they have to calculate deferred tax every month. Why not combine that with calculations of advances for CIT using the very helpful expert calculator.