Many Happy Returns (1986)

In this satire of the I.R.S., George Segal plays an Average Joe targeted for the Audit from Hell. His bank accounts are frozen, his home and business are attached by the government, and his wife leaves him. Segal is forced to move into the house of his obnoxious brother-in-law where lot of Odd Couple-type comedy ensues. Segal then plots to turn the tables on the I.R.S., and win back his wife and life.