Trump Team Eyes Gradual Gas Tax Return After Holiday Ends

How long would a federal fuel tax phase-in take?

The Trump administration is considering a gradual restoration of federal fuel taxes after any suspension ends, potentially stretching the phase-in over more than a year to avoid supply shortages, according to officials familiar with the planning.

The federal diesel tax currently stands at 24.4 cents per gallon. A suspension would drop that cost immediately from every gallon a carrier buys, $122 off a 500-gallon fill, $610 off a week's fuel for a five-truck fleet running 600 miles per day. The question now is how long that relief lasts and whether the tax comes back all at once or in steps.

Officials are drafting language that would bring the taxes back incrementally to prevent the kind of supply disruptions that hit fuel markets when policy changes land abruptly. The phased approach under discussion would restore the 18.4-cent gasoline tax and the 24.4-cent diesel tax in stages, possibly over 12 to 18 months, rather than flipping the full levy back on in a single day.

Why a gradual return matters for diesel buyers

A staggered phase-in changes the math for carriers deciding whether to lock fuel prices or ride the spot market. If the diesel tax comes back in four quarterly steps: say, 6.1 cents per quarter, a fleet buying 10,000 gallons a month sees fuel costs rise $610 every three months instead of $2,440 overnight. That spread gives dispatchers time to adjust lane bids and renegotiate fuel surcharge tables with shippers.

The timing also matters against the current diesel price backdrop. Diesel hit $5.66 per gallon on May 15 as Brent crude jumped to $108 on supply disruptions tied to the Iran conflict. A 24.4-cent tax suspension would pull the pump price back to $5.42, still elevated, but enough to shave $1,220 off a weekly fuel bill for a five-truck operation. If that suspension expires abruptly while crude remains above $100, the combined hit could push diesel back toward $6.

The supply-shortage concern driving the gradual-return proposal stems from refinery behavior during past tax holidays. When taxes drop, retail demand typically jumps as consumers and fleets both increase purchases to capture the savings. When the holiday ends suddenly, refiners and distributors sometimes hold back inventory in anticipation of the tax restart, creating short-term tightness at the rack. A phased restoration smooths that demand curve and reduces the incentive to hoard supply ahead of the tax coming back.

What a phase-in looks like in practice

No final language has been released, but the structure under discussion would likely tie each increment to a calendar quarter or a fixed interval. One scenario: the diesel tax returns in four equal steps of 6.1 cents, starting three months after the holiday ends. Another: a smaller initial step, say, 4 cents, followed by three larger ones, giving fleets more time to adjust before the bulk of the tax returns.

The phase-in would apply to both the Highway Trust Fund tax (the 24.4-cent diesel levy and 18.4-cent gasoline levy) and any related excise taxes suspended under the same authority. The gradual return does not change the total amount of tax ultimately paid: it only spreads the restoration over time to avoid a single-day price shock.

For owner-operators and small fleets, the key variable is how the phase-in overlaps with crude oil prices and refinery margins. If Brent crude falls back below $90 by the time the tax starts returning, the incremental increases may be absorbed by declining wholesale costs. If crude stays above $100, as it has since early May, each step up in the tax becomes a direct hit to the settlement statement with no offset.

The fuel cost split for a 10-truck fleet

A 10-truck fleet running 600 miles per day per truck at 6 miles per gallon burns roughly 20,000 gallons a month. At the current $5.66 diesel price, that's $113,200 in monthly fuel cost. A 24.4-cent tax suspension drops the price to $5.42 and cuts the monthly bill to $108,400: a $4,800 savings.

If the tax returns in four quarterly steps of 6.1 cents each, the fleet's fuel cost rises $1,220 per month every three months. The first quarter after the phase-in starts, diesel climbs to $5.48 and the monthly bill hits $109,600. Three months later, another 6.1 cents brings diesel to $5.54 and the bill to $110,800. By the fourth quarter, the full 24.4 cents is back and the fleet is paying $113,200 again, right where it started, assuming the underlying wholesale price hasn't moved.

The advantage of the phase-in is predictability. A fleet knows the tax is coming back in steps and can adjust bids, fuel surcharge agreements, and hedging strategies accordingly. The risk is that crude prices rise during the phase-in period, compounding the tax increases. If Brent climbs another $10 per barrel while the diesel tax is returning, the fleet could see pump prices jump 50 to 60 cents per gallon over six months: far more than the 24.4-cent tax alone.

What happens if the phase-in doesn't happen

If the administration opts for an immediate restoration instead of a gradual return, the diesel tax comes back in full on a single date. That scenario puts maximum pressure on carriers to time fuel purchases and lock prices ahead of the restart. Fleets with storage capacity or access to bulk fuel contracts gain an edge. Owner-operators buying at the pump take the full hit overnight.

The supply-shortage risk also rises. Refiners and distributors anticipating a sudden tax restart may reduce rack sales in the days leading up to the change, creating short-term tightness and price spikes at the retail level. That dynamic played out during state-level gas tax holidays in 2022, when some markets saw pump prices jump more than the tax itself in the week after the holiday ended.

The phased approach under discussion is designed to avoid that outcome by giving the supply chain time to adjust and removing the incentive to hoard inventory ahead of a single restart date. Whether it works depends on how predictable the phase-in schedule is and whether the administration sticks to the announced timeline without last-minute changes.

The timing question no one can answer yet

The biggest unknown is when any suspension starts and how long it lasts before the phase-in begins. If the tax holiday runs six months and the phase-in takes another 12, carriers get 18 months of partial relief. If the holiday runs three months and the phase-in takes six, the relief window is shorter and the cost curve steeper.

Officials have not set a timeline for either the suspension or the phase-in. The language under discussion is preliminary, and the final structure will depend on legislative negotiations and budget scoring. What's clear is that the administration is planning for a gradual return rather than a cliff, and that the phase-in period could stretch beyond a year to smooth the transition and avoid supply disruptions.

For small fleets, the takeaway is simple: if a diesel tax suspension happens, plan for the tax to come back in steps, not all at once. Lock fuel prices or hedge exposure based on the phase-in schedule, not the suspension end date. And watch crude oil prices, if Brent stays above $100 while the tax is returning, the combined hit could push diesel costs higher than they were before the holiday started.