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As expected, 2017 has brought a flurry of action relating to state gasoline taxes. As of this writing, six states (California, Indiana, Montana, South Carolina, Tennessee, and Utah) have enacted gas tax increases this year, bringing the total number of states that have raised or reformed their gas taxes to 24 since 2013.

These increases will play an important role in offsetting the loss of gas tax purchasing power caused by rising construction costs and improvements in vehicle fuel-efficiency. Although it’s worth mentioning that some of these long-overdue updates were paired with cuts in unrelated taxes that will create challenges for funding other areas of the budget, including education and health.

A summary of gas tax changes enacted since 2013 is below. This post will be updated in the weeks ahead as a handful of additional states continue to debate boosting their gas taxes.


2017 Enacted Legislation

  • California: A 12-cent gas tax increase and 20-cent diesel tax increase will take effect on Nov. 1, 2017. The new law also changes the formula that California uses to implement ongoing gas tax rate adjustments. Among those changes are a new provision allowing for gas tax increases based on the rate of inflation within the state’s borders.
  • Indiana: A 10-cent increase will take effect July 1, 2017. Further adjustments will occur between 2018 and 2024 based on a new formula that considers both inflation and the rate of growth in Indiana’s personal income. The new law also shifts the portion of sales tax revenue collected on gasoline purchases out of the general fund and toward transportation instead.
  • Montana: A 6-cent per gallon gas tax increase will be phased-in over 6 years. Most of the increase (4.5 cents) will take effect on July 1, 2017. The remainder will be implemented in 0.5 cent increments between July 1, 2019 and July 1, 2022. The state’s diesel tax will eventually rise by 2 cents, with most of that increase (1.5 cents) taking effect July 1, 2017.
  • South Carolina: The legislature overrode Gov. Henry McMaster’s veto to enact a 12-cent per gallon increase in the tax rate on both gasoline and diesel. The increase will be phased-in over 6 years, with the first increase (of 2 cents per gallon) taking effect on July 1, 2017.
  • Tennessee: The gas tax will rise by 6 cents and the diesel tax by 10 cents on July 1, 2017. While Gov. Bill Haslam initially proposed indexing the state’s gas tax rate to inflation, this reform was not included in the final package passed by the legislature.
  • Utah: A new law modifies the variable-rate gas tax formula enacted by Utah lawmakers in 2015 in a way that will allow for somewhat more robust revenue growth. The new formula is expected to result in a roughly 0.6-cent-per-gallon tax increase in 2019 and a 1.2-cent increase in 2020.

2016 Enacted Legislation

  • New Jersey: A 22.6-cent per gallon increase in the gasoline tax took effect on Nov. 1, 2016. The diesel tax will eventually rise by a similar amount, as a 15.9 cent increase went into effect on Jan. 1, 2017 and an additional increase is scheduled for July 1. Moving forward, New Jersey’s gas tax rate will vary based on a formula designed to raise a target amount of revenue.

2015 Enacted Legislation

  • Georgia: A 6.7-cent increase took effect July 1, 2015. A new formula for calculating the state’s tax rate will allow for future rate increases alongside inflation and vehicle fuel-efficiency improvements. This will allow the tax to retain its purchasing power in the years ahead. The first such increase (0.3 cents) under this formula took effect on Jan. 1, 2017.
  • Idaho: A 7-cent increase took effect July 1, 2015.
  • Iowa: A 10-cent increase took effect March 1, 2015.
  • Kentucky: Falling gas prices nearly resulted in a 5.1-cent gas tax cut in 2015, but lawmakers scaled that cut back to just 1.6 cents by setting a minimum “floor” on the state’s gas tax rate. The net result was a 3.5-cent-per-gallon increase relative to previous law.
  • Michigan: The state’s gasoline and diesel taxes rose by 7.3 cents and 11.3 cents, respectively, on Jan. 1, 2017. Beginning in 2022, the state’s gas tax will begin rising annually to keep pace with inflation.
  • Nebraska: A 6-cent increase was enacted over Gov. Pete Ricketts’ veto. Nebraska’s gas tax rate is rising in 1.5 cent increments over four years. The first two of those increases took effect on January 1 of 2016 and 2017.
  • North Carolina: Falling gas prices were expected to trigger a gas tax cut of 7.9 cents per gallon, but lawmakers scaled that cut down to just 3.5 cents, resulting in a 4.4 cent increase relative to previous law. Additionally, a reformed gas tax formula that takes population and energy prices into account will bring further gas tax increases in the years ahead. The first of those increases (0.3 cents) took effect on Jan. 1, 2017.
  • South Dakota: A 6-cent increase took effect April 1, 2015.
  • Utah: A 4.9-cent increase took effect on Jan. 1, 2016. Future increases will occur under a new formula that considers both fuel prices and inflation. This formula was modified under legislation enacted in 2017 to allow for faster gas tax revenue growth.
  • Washington State: An 11.9-cent increase was implemented in two stages: 7 cents on Aug.1, 2015, and a further 4.9 cents on July 1, 2016.

2014 Enacted Legislation

  • New Hampshire: A 4.2-cent increase took effect July 1, 2014.
  • Rhode Island: The gas tax rate was indexed to inflation. This resulted in a 1-cent increase on July 1, 2015 and will lead to further increases in most odd-numbered years thereafter (2017, 2019, etc).

2013 Enacted Legislation

  • Maryland: The first stage of a significant gas tax reform, which tied the tax rate to inflation and fuel prices, took effect on July 1, 2013. Since then, the state’s tax rate has increased by 10 cents above its early-2013 level.
  • Massachusetts: A 3-cent increase took effect July 31, 2013.
  • Pennsylvania: The first stage of a significant gas tax reform, tying the rate to fuel prices, took effect on Jan. 1, 2014. So far the gasoline tax rate has increased by 27 cents per gallon while the diesel tax has increased by 35.5 cents.
  • Vermont: A 5.9-cent increase and modest gas tax restructuring took effect May 1, 2013. Since Vermont’s gas tax rate is linked to gas prices, however, the actual rate has varied since then.
  • Virginia: As part of a larger transportation funding package, lawmakers raised statewide diesel taxes effective July 1, 2013, as well as gasoline taxes in the populous Hampton Roads region. Outside of Hampton Roads, gasoline taxes are 1.3 cents lower than they were before the reform, but a new formula included in the law will cause the tax rate to rise alongside gas prices in the years ahead.
  • Wyoming: A 10-cent increase took effect July 1, 2013. Gov. Matt Mead’s signature on this increase made Wyoming the first state to approve a gas tax increase in over three and a half years (no state enacted a gas tax increase in 2010, 2011, or 2012).
  • District of Columbia: Legislation approved in 2013 has yet to impact Washington D.C.’s gas tax rate in practice, though by tying its tax rate to fuel prices the District opened the door to potential gas tax rate increases in the future.