In the UK small brewers (I can't recall the cutoff point) are charged a function of a flat rate by volume by alcohol percent:
(6.63 * hl * %abv)
So a 10 hl batch of 4.2% abv would be about 278 GBP.
or
8.52 US barrels = 537 USD
or
63 USD / US barrel
Bigger brewers are double that and they are lobbying hard to take the tax break
away from the little guys...
Cheers,
Jeff Rosenmeier (Rosie)
Chairman of the Beer
Lovibonds Brewery Ltd
Henley-on-Thames, Englandshire
W: www.lovibonds.com
F: LovibondsBrewery
T: @Lovibonds