All taxes billed are for the period of January 1 through December 31.  The taxes are collected in two portions (summer and winter) to make it easier on the taxpayer.  Different taxing authorities collect at different times. For instance, schools collect their portion of tax dollars on the summer tax bill but are not listed on the winter tax bill.  The Fire Department collects its portion of tax dollars on the winter tax bill but are not listed on the summer tax bill