Skip to Content
Streetsblog USA home
Streetsblog USA home
Log In
The current gas tax is too low to keep the Highway Trust Fund solvent -- what would happen if the tax is cut? Source: Congressional Budget Office

Ben Smith of Politico mentioned a little tidbit that has eluded some of us: The federal gas tax expires September 30, at the same time as the current reauthorization extension. Most of it, anyway -- 4.3 cents of the current 18.4-cent-per-gallon tax will stay.

The gas tax isn't part of the reauthorization; it's just a coincidence that the dates are the same. Regardless, it's another thing to worry about on that day.

Smith cites an accountant's memo which details exactly what's expiring:

— All but 4.3 cents-per-gallon of the taxes on highway gasoline, diesel fuel, kerosene, and alternative fuels (Secs. 4041(a) and 4081(d)(1))— Reduced rate of tax on partially exempt methanol or ethanol fuel (Sec. 4041(m))— Tax on retail sale of heavy highway vehicles (Sec. 4051(c))— Tax on heavy truck tires (Sec. 4071(d))— Annual use tax on heavy highway vehicles (Sec. 4481(f))

"What could possibly go wrong?" tweets kclightrail.

No one on Capitol Hill is seriously suggesting an increase in the tax, and transportation advocates are just hoping no one targets it for a cut. So, while the expiration of the reauthorization is the subject of much fanfare, the impending expiration of the gas tax has mostly flown under the radar, and that's just the way many advocates want it.

But the date is circled on the staff calendar over at Transportation for America. "In this political climate, who knows if Congress will suddenly decide to cut the gas tax?" said T4America's Steve Davis.

Indeed, as advocates have pushed (to no avail) for a higher gas tax to fund the nation's transportation needs, they may now find themselves having to defend the too-low tax we now have.

Stay in touch

Sign up for our free newsletter

More from Streetsblog USA

Friday Video: Buenos Aires Will Challenge Everything You Think You Know About Buses

The Paris of South America has an amazing bus system — but it doesn't run like North American ones at all.

March 13, 2026

Friday’s Headlines Change How We Keep Score

The way the U.S. measures traffic death rates skews public perception toward the status quo.

March 13, 2026

Talking Headways Podcast: Buildings are Here to Help People

Jeremy Wells on his book, Managing the Magic of Old Places: Crafting Public Policies for People-Centered Historic Preservation.

March 12, 2026

Bus Companies Say There’s a Better Way to Take a ‘Great American Road Trip’ This Summer

"Our eventual goal is to make inter-city bus travel every American's first consideration when they think about how to get from one city to the next."

March 12, 2026

Opinion: Make This Summer’s World Cup A Car-Free Paradise

NYC has a major opportunity to support people who don't drive during the World Cup. Could other host cities do it, too?

March 12, 2026

Thursday’s Headlines Can’t Keep Up

While other developed nations are building more transit lines as their populations increase, the U.S. is not.

March 12, 2026
See all posts