Source : Webster's Revised Unabridged Dictionary (1913)

Taxer \Tax"er\, n.
   1. One who taxes.

   2. One of two officers chosen yearly to regulate the assize
      of bread, and to see the true gauge of weights and
      measures is observed. [Camb. Univ., Eng.] [Written also
      {taxor}.]

Source : WordNet®

taxer
     n : a bureaucrat who levies taxes