Once a quarter, open IFTA, Inc.’s tax-rate matrix for that quarter and paste one line per jurisdiction: STATE, diesel rate, gasoline rate in US dollars per gallon (e.g. TX, 0.2000, 0.2000). Canadian provinces use their two-letter codes. Preview first; lines that can’t be read are listed, never guessed. Customers’ IFTA pages then show estimated tax owed for that quarter.