1. Except as otherwise provided in this section, in a county whose population is 700,000 or more and in which a commission has been created and a tax is imposed pursuant to NRS 373.030:

(a) The board may by ordinance impose:

(1) An excise tax on each gallon of motor vehicle fuel, except aviation fuel, sold in the county in an amount equal to the product obtained by multiplying 3.6 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 3.6 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(b) The board may by ordinance impose:

(1) An excise tax on each gallon of motor vehicle fuel, except aviation fuel, sold in the county in an amount equal to the product obtained by multiplying 1.75 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 1.75 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(c) The board may by ordinance impose:

(1) An excise tax on each gallon of motor vehicle fuel, except aviation fuel, sold in the county in an amount equal to the product obtained by multiplying 1 cent per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 1 cent per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(d) The board may by ordinance impose:

(1) An excise tax on each gallon of motor vehicle fuel, except aviation fuel, sold in the county in an amount equal to the product obtained by multiplying 9 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 9 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(e) The board may by ordinance impose:

(1) An excise tax on each gallon of motor vehicle fuel, except aviation fuel, sold in the county in an amount equal to the product obtained by multiplying 18.455 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 18.455 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(f) The board may by ordinance impose:

(1) An excise tax on each gallon of motor vehicle fuel, except aviation fuel, sold in the county in an amount equal to the product obtained by multiplying 18.4 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 18.4 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(g) The board may by ordinance impose:

(1) An excise tax on each gallon of special fuel that consists of an emulsion of water-phased hydrocarbon fuel sold in the county in an amount equal to the product obtained by multiplying 19 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 19 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(h) The board may by ordinance impose:

(1) An excise tax on each gallon of special fuel that consists of liquefied petroleum gas sold in the county in an amount equal to the product obtained by multiplying 22 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 22 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(i) The board may by ordinance impose:

(1) An excise tax on each gallon of special fuel that consists of compressed natural gas sold in the county in an amount equal to the product obtained by multiplying 21 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 21 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(j) The board may by ordinance impose:

(1) An excise tax on each gallon of special fuel sold in the county, other than any special fuel described in paragraph (g), (h) or (i), in an amount equal to the product obtained by multiplying 27.75 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 27.75 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(k) The board may by ordinance impose:

(1) An excise tax on each gallon of special fuel that consists of liquefied petroleum gas sold in the county in an amount equal to the product obtained by multiplying 18.3 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 18.3 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(l) The board may by ordinance impose:

(1) An excise tax on each gallon of special fuel that consists of compressed natural gas sold in the county in an amount equal to the product obtained by multiplying 18.3 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 18.3 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

(m) The board may by ordinance impose:

(1) An excise tax on each gallon of special fuel sold in the county, other than any special fuel described in paragraph (k) or (l), which is taxed by the Federal Government at a rate per gallon or gallon equivalent of 24.4 cents or more, in an amount equal to the product obtained by multiplying 24.4 cents per gallon by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the ordinance becomes effective; and

(2) Except as otherwise provided in subsection 5, an annual increase in the tax imposed pursuant to subparagraph (1), on the first day of each fiscal year following the fiscal year in which that tax becomes effective, in the amount determined by adding 24.4 cents per gallon to the amount of the tax imposed pursuant to subparagraph (1) during the immediately preceding fiscal year, then multiplying that sum by the lesser of the applicable percentage or the adjusted average highway and street construction inflation index for the fiscal year in which the increase becomes effective.

2. An ordinance authorized by this section must be approved by a two-thirds majority of the members of the board. If the board adopts an ordinance authorized by this section, the ordinance must impose all of the taxes authorized by this section. Upon the adoption of such an ordinance, and except as otherwise provided in subsection 5, no further action by the board is necessary to effectuate the annual increases in the taxes imposed by the ordinance.

3. If the board adopts an ordinance imposing the taxes authorized by this section, the ordinance:

(a) Must be adopted before October 1, 2013;

(b) Must become effective on January 1, 2014; and

(c) Is not affected by any changes in the population of the county which occur after the adoption of the ordinance.

4. The applicable percentage specified by the board for the taxes imposed pursuant to this section must be the same percentage for each tax imposed pursuant to this section. Except as otherwise provided in subsection 5, the board may amend the applicable percentage by ordinance from time to time, but any such amendment must not become effective earlier than 90 days after the date of the adoption of the ordinance amending the applicable percentage. Except as otherwise provided in subsection 4 of NRS 373.120, the applicable percentage must not be amended to reduce the applicable percentage at any time that bonds are outstanding which are secured by the taxes imposed pursuant to this section.

5. Upon the adoption of an ordinance authorized by this section:

(a) For the period beginning on January 1, 2014, and ending on December 31, 2016, no further action by the board is necessary to effectuate the annual increases in the taxes imposed by the ordinance.

(b) For the period beginning on January 1, 2017, and ending on December 31, 2026, the annual increases in the taxes authorized by this section and imposed by the ordinance may not be effectuated unless a question is placed on the ballot at the general election on November 8, 2016, which asks the voters in the county whether to authorize the board to impose, for the period beginning on January 1, 2017, the increases authorized by this section in the taxes imposed by the ordinance and the question is approved by a majority of the registered voters voting on the question. If the question is approved by a majority of such voters, no further action by the board is necessary to effectuate the annual increases in the taxes authorized by this section and imposed by the ordinance. If the question is not approved by a majority of such voters, the board shall not impose any additional annual increases in the taxes authorized by this section and imposed by the ordinance after November 8, 2016, but any annual increases in such taxes imposed by the ordinance on or before November 8, 2016, are not affected, amended, reduced or eliminated and must be continued for any period during which bonds are outstanding that are secured by such taxes imposed by the ordinance.

(c) For the period beginning on January 1, 2027, if the question placed on the ballot pursuant to paragraph (b) is approved by a majority of the registered voters in the county voting on the question, the annual increases in the taxes authorized by this section and imposed by the ordinance may be effectuated if a question is placed on the ballot at the general election on November 3, 2026, which asks the voters in the county whether to authorize the board to impose, for the period beginning on January 1, 2027, the increases authorized by this section in the taxes imposed by the ordinance and the question is approved by a majority of the registered voters voting on the question. If the question is approved at the general election on November 3, 2026, by a majority of such voters, no further action by the board is necessary to effectuate the annual increases in the taxes authorized by this section and imposed by the ordinance. If the question is not approved by a majority of such voters, the board shall not impose any additional annual increases in the taxes authorized by this section and imposed by the ordinance after November 3, 2026, but any annual increases in such taxes imposed by the ordinance on or before November 3, 2026, are not affected, amended, reduced or eliminated and must be continued for any period during which bonds are outstanding that are secured by such taxes imposed by the ordinance.

6. As used in this section:

(a) “Adjusted average highway and street construction inflation index” means:

(1) For the fiscal year in which an ordinance adopted pursuant to this section becomes effective, the percentage obtained by adding the average highway and street construction inflation index for that fiscal year to:

(I) If the average highway and street construction inflation index for the immediately preceding fiscal year is greater than the applicable percentage, the remainder obtained by subtracting the applicable percentage from the average highway and street construction inflation index for the immediately preceding fiscal year; or

(II) If the average highway and street construction inflation index for the immediately preceding fiscal year is less than or equal to the applicable percentage, zero; and

(2) For each fiscal year following the fiscal year in which the ordinance becomes effective, the percentage obtained by adding the average highway and street construction inflation index for that fiscal year to:

(I) If the adjusted average highway and street construction inflation index for the immediately preceding fiscal year is greater than the applicable percentage, the remainder obtained by subtracting the applicable percentage from the adjusted average highway and street construction inflation index for the immediately preceding fiscal year; or

(II) If the adjusted average highway and street construction inflation index for the immediately preceding fiscal year is less than or equal to the applicable percentage, zero.

(b) “Applicable percentage” means the lesser of 7.8 percent or the percentage specified by the board in any ordinance imposing a tax pursuant to this section.

(c) “Average highway and street construction inflation index” means for a fiscal year the average percentage increase in the highway and street construction inflation index for the 10 calendar years immediately preceding the beginning of that fiscal year.

(d) “Highway and street construction inflation index” means:

(1) The Producer Price Index for Highway and Street Construction until that Index ceased to be published; and

(2) The Producer Price Index for Other Nonresidential Construction thereafter or, if that Index ceases to be published by the United States Department of Labor, the published index that most closely measures inflation in the costs of highway and street construction, as determined by the commission.

(e) “Special fuel” has the meaning ascribed to it in NRS 366.060.

(Added to NRS by 2013, 3532; A 2015, 2041, 2065)