As of July 1, 2012, the state’s diesel fuel tax rate increased to 51.2¢ per gallon, up 5¢ per gallon from the previous fiscal year.
By law, the diesel fuel tax rate consists of a (1) base rate of 29 cents per gallon and (2) variable rate that resets each July 1, which the Department of Revenue Services commissioner calculates. The commissioner annually, by June 15, calculates the variable rate by multiplying the (1) average wholesale price for diesel fuel during the 12 month period ending on the preceding March 31 and (2) petroleum products gross earnings tax rate in effect during the same 12 months, rounded to the nearest 10th of a cent. The commissioner must use wholesale price information published by the Oil Price Information Service and average the price information for Hartford/Rocky Hill and New Haven
