Federal Funding

The U.S. government uses its Federal taxing authority to levy several taxes supporting transportation funding through the Highway Trust Fund. In addition, some funding for surface transportation is sourced from the General Fund of the U.S. Treasury.

Federal Motor Fuel Taxes

The motor fuel tax is a per-gallon excise tax levied on gasoline, diesel, and other special fuels, and is deposited into the Federal Highway Trust Fund (HTF). Motor fuel taxes provide the majority of the revenue used for Federal surface transportation funding.

The HTF was established by the Federal-aid Highway Act of 1956 for the direct purpose of funding the construction of an Interstate Highway System and aiding in the finance of primary, secondary, and urban routes. Prior to establishment of the HTF, a federal motor fuel tax of 1 cent per gallon was enacted in 1932 and increased, extended, and rescinded multiple times until 1955. Revenue was not collected in a dedicated fund, but instead was pooled with the General Fund of the Treasury. Similarly, cash to pay for obligations incurred for the Federal highway program came from the General Fund.

Initially set at 3 cents per gallon in 1956, the motor fuel tax was increased to 4 cents per gallon in 1959. Then after a 24-year hiatus, motor fuel taxes were increased to 9 cents per gallon in 1983 and a new dedicated Mass Transit Account was established alongside the existing Highway Account and was funded with one-ninth of the revenues coming into the HTF. The next year, the motor fuel tax on diesel fuel was increased separately by 6 cents per gallon, a differential that remains today.

Since 1987, except from January 1996 to October 1997, an additional 0.1 cent per gallon has been levied and deposited in the Leaking Underground Storage Tank Trust Fund.

In 1990, a 5-cent increase was passed as part of the Omnibus Budget Reconciliation Act, raising the Federal motor fuel tax to 14 cents per gallon for gasoline and 20 cents per gallon for diesel fuel. However, this legislation also directed half of the increase to the General Fund of the Treasury for deficit reduction. A final fuel tax increase of 4.3 cents per gallon was enacted in 1993 to further aid in deficit reduction, bringing the motor fuel tax to its current level of 18.3 cents per gallon for gasoline and 24.3 cents per gallon for diesel fuel. This bill ended the redirection of 2.5 cents to the General Fund in 1995, but instead, the 4.3-cent increase was used for deficit reduction until the Taxpayers Relief Act of 1997 ended that provision. The current tax rates on motor fuels are shown in the table.

Distribution of Tax
Type of Excise TaxTax rate (cents)Highway AccountMass Transit Account
Gasoline118.3 per gallon84%16%
Diesel124.3 per gallon88%12%
Gasohol118.3 per gallon84%16%
Liquefied petroleum gas18.3 per gallon88%12%
Liquefied natural gas24.3 per gallon92%8%
Compressed natural gas18.3 per gallon93%7%

1 In addition to these rates, a 0.1-cent per gallon tax is levied and deposited in the Leaking Underground Storage Tank Trust Fund.


Most of the excise taxes credited to the HTF are not collected directly from the consumer. Instead, they are paid to the Internal Revenue Service by the producer or importer of the taxable product. User taxes are deposited in the General Fund of the Treasury, and the amounts equivalent to these taxes are then transferred to the HTF. Monthly transfers are made based on estimates and are later adjusted on the basis of actual tax receipts, as shown in the figure.


Federal legislation requires generally that funds paid into the HTF be returned to the states for various highway program areas in accordance with legislatively established formulas. Prior to the Moving Ahead for Progress in the 21st Century Act (MAP-21) enacted in 2012, each apportioned highway program funded by the HTF had its own formula for distribution, and the total amount of Federal assistance a State received was the sum of the amounts it received for each program. Additionally, a set of complex procedures dictated the method for apportioning HTF funding among the states. MAP-21 requires FHWA to divide the total authorized amount among the states in the following manner:

As under MAP-21, the Fixing America’s Surface Transportation (FAST) Act – enacted in late 2015 – authorizes a single amount for each year for all apportioned highway programs combined. That amount is apportioned among the States, and then each State’s apportionment is divided among the individual apportioned programs.


Funding Federal-aid Highways
This FHWA publication typically has been updated following the enactment of new highway or surface transportation acts. The report explains the funding of Federal-aid highways and follows the financial process from inception in an authorization act to payment from the HTF, and includes discussion of the congressional and Federal agency actions that occur throughout. This January 2017 update of the report incorporates changes in funding procedures brought about by MAP-21 and the FAST Act.

MAP-21 Apportionment of Federal Highway Tax Revenues
FAST Act Apportionment of Federal Highway Tax Revenues
Further detail on the apportionment process is found on FHWA’s MAP-21 and FAST Act websites.

Highway Statistics (published annually)
These publications are prepared by the FHWA Office of Highway Policy Information presenting and analyzing statistics of general interest on motor fuel, motor vehicles, driver licensing, highway-user taxation, state highway finance, highway mileage, and Federal aid for highways. They also include highway finance data for municipalities, counties, townships, and other units of local government.

Other Federal Taxes

Several other taxes are collected by the Federal government and deposited in the HTF.

Truck Tire Excise Tax

Based on maximum rated load capacity and collected from the manufacturer or importer and passed on to the retailer and ultimate consumer:

Truck and Trailer Sales Tax

Heavy Vehicle Use Tax

Use of the General Fund

While the Highway Trust Fund, backed by motor fuel taxes and several other Federal taxes, provides most surface transportation funding, some revenue comes from the Federal General Fund. Most of the Federal funding derived from the General Fund is used to support intercity passenger rail and Amtrak through FRA and mass transit capital investment grants through FTA. Other uses of the General Fund include USDOT agency operations, emergency highway relief beyond authorized levels, the RAISE discretionary grant program (formerly TIGER and BUILD programs), and transportation research. The General Fund has also been used since 2008 to cover shortfalls in the Highway Trust Fund’s ability to meet its obligations.

Intercity Passenger Rail

All funding administered by the FRA comes from the General Fund. This includes state intercity passenger rail capital assistance to states and operating, capital, and efficiency incentive grants to Amtrak.

Capital Investment Grants

New Starts, Small Starts, and Core Capacity fixed guideway capital projects administered by FTA under Title 49, Section 5309.

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