Federal excise taxes contain tax expenditure provisions analogous to t
he tax expenditures imbedded in individual and corporate income taxati
on. These provisions generate revenue losses from exemptions or reduce
d tax rates for particular groups of producers or consumers of commodi
ties and services otherwise subject to excise taxation. The 244 tax ex
penditure provisions identified here are deviations from the ''normal
structure'' of nine different types of excise taxes. Theoretical issue
s involved in estimating resulting revenue losses are discussed, but e
stimates of revenue losses and studies of the efficiency of these tax
expenditures in accomplishing fiscal objectives remain subjects for fu
ture research.