Backers say lowering taxes would result in more purchases and would increase state revenue to levels prior to privatization.
Since the state's liquor system went private, prices have been too high for some consumers.
In fact, last month, Idaho regulators reported Washingtonians crossing the border seeking cheaper booze boosted the Gem State's coffers by $10 million.
However, according to fiscal impact estimates prepared by state agencies, cutting taxes for booze would cost the state $20 million in the first two years of implementation and more than $46 million two years later. Local governments would also lose millions.
The bill is being introduced with only two weeks left in the legislative session.