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BETTESWORTHConstruction

Highway Construction Funding: Who Pays, Where the Money Comes From, and How It Flows

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Highway construction in the United States is paid for with a mix of federal, state, and local money—not by the federal government alone. In 2024, states and local governments supplied 84% of highway revenue, while the federal government supplied 16%; federal aid commonly helps pay for eligible work but usually requires a nonfederal match and is generally reimbursed as a project proceeds.

The key distinction is between who supplies revenue, who spends it, and how federal assistance reaches a project. Those are not the same accounting measure. The latest national figures reported by the Federal Highway Administration (FHWA) show why: the federal government provided $54 billion in highway revenue and $64 billion in payments to state and local governments in 2024, but only $5 billion was counted as direct federal highway spending.

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How is highway construction paid for?

Highway construction is financed through a layered system. Federal taxes support federal-aid programs; states and local governments raise their own revenue and choose or manage many projects; and the project sponsor typically combines available funds to cover eligible costs. A sponsor may also borrow, using bonds or federal credit assistance, and repay that financing over time.

For 2024, FHWA reports $325 billion in highway revenue and $332 billion in highway spending nationwide. The revenue figure describes funds raised or received by each level of government; the spending figure describes where highway money was spent. They are not expected to match in every year: timing, borrowing, transfers, and the treatment of federal aid affect the totals. FHWA’s 2026 national highway funding and spending tables report these amounts.

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Level of government Highway revenue, 2024 Share of revenue Highway spending, 2024 Share of spending
State $177 billion 55% $206 billion 62%
Local $94 billion 29% $121 billion 36%
Federal direct spending $54 billion 16% $5 billion 2%
Total $325 billion 100% $332 billion 100%

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The federal spending line needs special care: it is direct federal spending, not all federal money supporting highways. FHWA separately reports $64 billion in intergovernmental highway payments in 2024—payments from the federal government to states and localities. Those recipients then administer or spend the aid, so it is not counted again as direct federal spending. In short, $5 billion does not mean federal involvement was limited to $5 billion; nor does $64 billion mean the federal government paid the entire highway bill.

What is the Highway Trust Fund?

The Highway Trust Fund is the principal federal financing source for the Federal-aid Highway Program. FHWA says 77% of the $54 billion in federal highway revenue in 2024 came from the Trust Fund’s highway account. It is supported by federal highway-user taxes, including motor-fuel taxes, tire taxes, taxes on trucks and trailers, and the Heavy Vehicle Use Tax.

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Federal fuel-tax rates have remained unchanged since 1997: 18.4 cents per gallon for gasoline and 24.4 cents per gallon for diesel. These are federal rates; state fuel taxes are separate, vary by state, and contribute to state transportation funding. The rates and 2024 revenue figures are in FHWA’s national funding and spending report.

The Trust Fund does not function like a dedicated account that automatically pays a contractor whenever a road needs work. Congress authorizes transportation programs and funding levels, then federal agencies administer the programs under statutory rules. FHWA describes the operational sequence as authorization, apportionment or distribution, obligation, and cash outlay:

  1. Congress authorizes programs. Federal surface-transportation law establishes programs, eligibility rules, and funding authority.
  2. FHWA apportions or distributes funds. Much of the money is allocated to states using formulas established in law; some programs use other distribution methods.
  3. Congress sets an obligation limitation. This limits how much of the authorized budget authority may be committed during a particular period.
  4. FHWA obligates funds for an eligible project. At a recipient’s request, FHWA commits the federal share to a qualifying project, subject to program requirements.
  5. Cash is paid out as eligible costs are incurred. The sponsor submits costs and receives federal reimbursement under the applicable procedures.

Authorization, obligation, and cash payment are different stages. A program’s authorization does not mean a particular project has already secured a federal commitment, and an obligation is not the same as cash already paid to the contractor.

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Does the federal government pay the whole highway construction bill?

Usually, no. Federal-aid is generally a cost-sharing arrangement: a state or local sponsor covers the nonfederal portion and follows federal project requirements to obtain the federal share. FHWA’s Federal-aid Essentials companion guide puts it plainly: “Two important characteristics of Federal-aid are that it is both a reimbursable and matching program.”

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For many federal-aid projects, the usual federal share is 80%, with the state or local sponsor providing 20%. Interstate projects generally have a 90% federal share. These are common shares, not universal rules: statutory exceptions apply, and certain specialized programs may permit 100% federal participation. The applicable share depends on the program, project, and law. FHWA explains the rules in its pages on federal share and obligation and introducing federal-aid funding.

Reimbursement changes how a project must manage cash. A sponsor normally incurs eligible project costs—often paying the contractor as work is completed—then submits documentation to receive the federal portion. The sponsor therefore needs cash or financing to cover its share and to manage the timing between paying costs and receiving reimbursement. Federal approval does not remove the sponsor’s responsibility to deliver the work, meet eligibility and oversight requirements, and provide any required match.

How do state and local governments raise road money?

State and local funding mixes differ by jurisdiction, and most projects draw on more than one source. FHWA identifies fuel and vehicle taxes, tolls, property and sales taxes, general-fund appropriations, impact fees, and other charges among the sources governments can use. A state might dedicate vehicle-related taxes to transportation, while a city or county might rely more heavily on property taxes, local sales taxes, or general revenues.

These sources differ in who pays and how predictably revenue arrives. Fuel and vehicle taxes are tied to road use or vehicle ownership. Toll revenue comes from users of a tolled facility. Property and sales taxes are broader taxes that may support roads alongside other public services. Impact fees and other charges can help fund infrastructure associated with development, subject to applicable rules. A general-fund appropriation is a budget decision rather than a dedicated highway-user tax.

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Governments can also set aside current revenue until construction begins or issue bonds to pay for work upfront and repay the debt over time. A bond is a financing method, not a new source of recurring operating revenue: it shifts when project money is available and when taxpayers or users repay it. Because highway finance statistics record bond proceeds when debt is issued, a year’s reported receipts can jump even though the borrowed amount will be repaid in later years. That is one reason a single year’s revenue should not be read as a simple measure of that year’s tax collections.

How does federal highway funding reach a state or local project?

The route depends on the program. Much federal highway assistance is distributed to states by formula, while competitive discretionary grants require applicants to seek awards through a separate selection process. After a state receives formula funds, its transportation department or, where applicable, a metropolitan planning organization (MPO) helps select projects under federal requirements and regional planning processes.

The Surface Transportation Block Grant (STBG) is an example of a flexible formula program. FHWA makes STBG funds available to states according to a statutory formula, and state DOTs or MPOs select projects within program rules. A formula allocation gives a state a funding framework; it does not automatically choose a particular road project or guarantee that a local proposal will be funded. FHWA’s STBG program overview describes the program.

Discretionary grants work differently. Governments and eligible project sponsors submit applications, and awards are selected through the program’s stated criteria and available funding. A grant announcement or application opportunity should not be confused with an award, and an award should not be confused with final reimbursement for construction costs. The funding lifecycle still has to move through eligibility review, project development, obligation, construction, and payment.

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For a local road, the local agency may own the facility and lead project development, while a state DOT coordinates federal-aid procedures or administers aspects of delivery. The exact arrangement varies by program and state. The FHWA overview of the Federal-aid Highway Program explains the federal-state-local structure.

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Why do local governments matter so much?

Counties, cities, towns, and other local public agencies own and operate about 75% of the highway network—roughly 2.9 million miles, according to FHWA’s Federal-aid Essentials material. Local ownership helps explain why local governments account for a substantial share of highway revenue and spending even though federal-aid programs are often discussed as state-federal partnerships.

FHWA estimates that about 7,000 local public agencies manage $7 billion annually in Federal-aid projects, around 15% of the total program. A local agency may have to coordinate planning, design, right-of-way, procurement, construction oversight, and federal documentation while relying on a state DOT for parts of the federal-aid process. The federal share is not simply handed to a local contractor: the eligible recipient and project sponsor must operate within program requirements.

Network-mile totals can differ across FHWA publications because tables define and group road systems differently. The 2026 national summary reports 4.2 million miles of public roads in one context, while Federal-aid program guidance uses 3.9 million miles in another. Those figures should not be treated as a direct contradiction or substituted for the specific local-ownership estimate; check the scope of the table before comparing network totals.

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How do bonds and federal credit tools fit in?

Grants and taxes are not the only means of assembling project capital. States and localities can issue bonds, and FHWA describes State Infrastructure Banks (SIBs) and Transportation Infrastructure Finance and Innovation Act (TIFIA) credit assistance as tools that can complement federal grant reimbursement. They may help a sponsor borrow, recycle repayments, or attract additional capital for eligible transportation work.

Credit assistance is financing, not a grant that erases project costs. A borrower still needs an eligible project, a sponsor able to meet legal and program conditions, and a viable repayment structure. Borrowing can accelerate construction or spread payment over time, but it adds repayment obligations and may introduce financing costs. FHWA’s Financing Federal-Aid Highways appendix discusses financing approaches.

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How to read a highway funding announcement

To understand what a funding announcement actually means, identify five things before assuming who will pay the bill:

  1. Government level: Is the money federal, state, local, or a combination?
  2. Revenue or financing source: Is it a user tax, general tax, toll, grant, bond proceeds, or credit assistance?
  3. Allocation method: Is the money formula-apportioned, competitively awarded, or appropriated through another process?
  4. Cash-flow treatment: Is the sponsor receiving an advance, a loan, or reimbursement after eligible costs are incurred?
  5. Match and obligations: What nonfederal share, repayment commitment, eligibility conditions, or spending deadline applies?

For example, a headline saying a project “received federal funding” may refer to a federal grant award or an obligation of federal-aid funds, not to the federal government paying 100% of construction. The project may still require state or local matching funds, and the sponsor may initially carry costs while reimbursement is processed. Conversely, a project can be built with state or local money without relying on a federal-aid program, depending on the project and the funding choices available.

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What is the clearest way to understand who pays?

Think of highway construction as a funding stack rather than a single check. The federal government supplies a minority share of national highway revenue and channels much of its aid through programs with eligibility, matching, and reimbursement rules. State and local governments raise the largest combined share of highway revenue, select and administer many projects, and pay a large part of construction costs directly or through financing. The mix for any specific road depends on its owner, location, program eligibility, available revenue, and project sponsor’s ability to provide the required match or repayment.

Frequently Asked Questions

Why can reported highway revenue and spending totals differ in the same year?

They track different events and can reflect different timing: borrowing may be recorded as revenue when bonds are issued, while construction spending occurs later. Intergovernmental transfers also move money between governments, so the same federal aid has to be distinguished from direct federal spending and recipient spending.

Can a city or county receive federal highway aid directly?

Local agencies manage many Federal-aid projects, but the delivery and administration route depends on the program and state. A city or county may work through its state DOT or another designated process and must meet the applicable project, documentation, and oversight requirements.

Are federal gas taxes the same as state gas taxes?

No. Federal fuel-tax rates are separate from state fuel taxes, which are set by individual states and may vary. State fuel-tax revenue can support state transportation programs in addition to federal-aid available through the Highway Trust Fund.

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Does getting a grant mean a highway project can start construction immediately?

Not necessarily. A grant or funding selection is one stage; a project may still need planning, environmental and design work, approvals, matching funds, right-of-way, and an FHWA obligation or other required commitment before eligible construction costs can be reimbursed.

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