The authoritative instrument for the distribution of all forms of official IRS tax guidance is the Internal Revenue Bulletin (IRB), a weekly collection of these and other items of general interest to the tax professional community.
perfidy definition: The definition of a perfidy is a deliberate betrayal. (noun) An example of a perfidy is spreading a best friend's secrets all over town....
perÂ·sistÂ·ent/pÃrÃsistÃnt/Adjective1. Continuing firmly or obstinately in a course of action in spite of difficulty or opposition. 2. Characterized by a specified habitual behavior pattern. 3. Continuing to exist despite efforts to eradicate it.