27 CFR § 26.262a - Computation of effective tax rate.
(1) The numerator will be the sum of:
(iii) The proof gallons of all distilled spirits derived from eligible flavors used in the product, multiplied by the tax rate prescribed by 26 U.S.C. 5001, but only to the extent that such distilled spirits exceed 2 1/2% of the denominator prescribed in paragraph (a)(2) of this section.
(2) The denominator will be the sum of:
(i) The proof gallons of all distilled spirits used in the product, including distilled spirits derived from eligible flavors; and
(b) In determining the effective tax rate, quantities of distilled spirits, eligible wine, and eligible flavors will be expressed to the nearest tenth of a proof gallon. The effective tax rate may be rounded to as many decimal places as the proprietor deems appropriate, provided that, such rate is expressed no less exactly than the rate rounded to the nearest whole cent, and the effective tax rates for all products will be consistently expressed to the same number of decimal places. In such case, if the number is less than five it will be dropped; if it is five or over, a unit will be added.
(c) The following is an example of the use of the formula.
|Distilled spirits||2249.1 proof gallons.|
|Eligible wine (14% alcohol by volume)||2265.0 wine gallons.|
|Eligible wine (19% alcohol by volume)||1020.0 wine gallons.|
|Eligible flavors||100.9 proof gallons.|