Colorado Revised Statutes Title 39. Taxation § 39-29-106. Tax on the severance of coal

(1) In addition to any other tax, there shall be levied, collected, and paid for each taxable year a tax upon the severance of all coal in this state. Such tax shall be levied against every person engaged in the severance of coal. Subject to the exemption and credits authorized in subsections (2), (3), and (4) of this section, the rate of the tax shall be thirty-six cents per ton of coal.

(3) For taxable years commencing prior to January 1, 2026, there is allowed, as a credit against the tax imposed by subsection (1) of this section, an amount equal to the percentage set forth in subsection (3.5) of this section of such tax for coal produced from underground mines.

(3.5) The percentage for the credits allowed under subsections (3) and (4) of this section is equal to:

(4) For taxable years commencing prior to January 1, 2026, there is allowed, as an additional credit against the tax imposed by subsection (1) of this section, an amount equal to the percentage set forth in subsection (3.5) of this section of such tax for the production of lignitic coal, as such coal is classified by the American society for testing and materials (ASTM) in their D 388 standard for the classification of coals by rank.

(5) For every full one and one-half percent change in the index of producers' prices for all commodities prepared by the bureau of labor statistics of the United States department of labor, the tax rate provided in subsection (1) of this section shall be increased or decreased one percent. The executive director shall determine such adjustments to the rate of tax based upon changes in the index of producers' prices from the level of such index as of January, 1978, to the level of such index as of the last month of the quarter immediately preceding the quarter for which any taxes are due.