Transportation funding in Illinois is generated from a variety of sources, including federal, state, local, and system-generated revenues. The state, transportation agencies, and local governments use these funds to construct, operate, administer, and maintain the current roadway and transit system, as well as improve and enhance the system to meet present-day and future transportation needs. Within the state’s larger budgeting process, transportation funding is composed of both operating and capital funding.
State operating support for transit continues to fall short of total costs
The proposed FY25 state operating budget allocates almost $4.5 billion to the Illinois Department of Transportation (IDOT), an increase of $337 million (or 8.2 percent) compared to FY24 enacted appropriations. The proposed budget includes a 10 percent funding increase for both paratransit services and reduced transit fare programs in northeastern Illinois. Specifically, the appropriations were increased from $9.1 million to $10 million between FY24 and FY25 and from $19.1 million to $21 million for paratransit and reduced fare costs, respectively.
However, this level of state support remains a small share of the total costs incurred by the Regional Transportation Authority (RTA) and its service boards. For comparison, paratransit expenses in northeastern Illinois are estimated to be almost $265 million in 2025, and the regional reduced fare program has an annual cost of approximately $83 million. The level of funding proposed in the budget only covers about 4 percent and 25 percent of the cost for these paratransit and reduced fare programs, respectively. Given the looming fiscal cliff facing the transit operating budget in 2026, CMAP called for the state to fully fund both paratransit and reduced fare programs in the RTA region in PART. Without greater state support, these mandates will continue to constrain funding for transit.
Transit funding changes do not advance greater transportation funding goals
The budget also proposes to use an additional $175 million from the Road Fund to supplement the state’s annual contribution to the Public Transportation Fund (PTF) and the Downstate Public Transportation Fund (DPTF), which support transit operations in northeastern and downstate Illinois, respectively. In northeastern Illinois, the state funds the PTF by matching a portion of local RTA sales tax receipts with state dollars, including an initial contribution of $150 million from the Road Fund, additional Road Fund monies for RTA debt service reimbursements, and state general funds. By increasing the Road Fund’s share of the state’s total contribution to transit operations — estimated to be $1.1 billion across the PTF and the DPTF — the FY25 budget proposal effectively allows an additional $175 million to flow into the General Fund for other uses. As a result, the Road Fund contribution towards transit operations will account for 54 percent of the total PTF and DPTF appropriations, compared to 20 to 25 percent in past years.
At the same time, the state has been shifting the revenues collected via state sales taxes on motor fuels from the General Fund to the Road Fund in recent years. This aligns with the Transportation Taxes and Fees Lockbox Amendment to the Illinois Constitution (the lockbox amendment) that ensures transportation revenues cannot be spent for non-transportation purposes. Beginning in fiscal year 2022, the state implemented a five-year phased approach to divert all motor fuel sales tax receipts to the Road Fund by fiscal year 2026. The FY25 budget proposes that the Road Fund receive 80 percent of these gasoline sales tax receipts, estimated to be $758 million total — a $162 million increase over last year. The increase is, however, offset by the proposed $175 million transfer from the Road Fund to the PTF.
On its surface, the proposal to use additional Road Fund dollars to fund the PTF aligns with principles shared by the lockbox amendment and PART. The PART report recommends using transportation revenues to fund transportation costs wherever possible. However, in practice, tapping the Road Fund to fund the PTF reduces the total state funding available for transportation purposes. Rather than growing over time, the combined General Fund deposits into the PTF and the Road Fund are projected to be $4 million less in FY25 than FY24. This practice could exacerbate the chronic underfunding of our transportation system and set a challenging precedent for addressing broader transportation needs in northeastern Illinois and across the state. Greater reforms are urgently needed to meet the transportation system’s operating and capital needs.
Figure 2: Shifting the funding burden of the Public Transportation Fund from the General Fund to the Road Fund effectively decreases the total funding available for transportation operations.
![Total Public Transportation Fund (PTF) and Downstate Public Transportation Fund (DPTF) revenues by source. Road Fynd transfers to the PTF are $280 million in FY2022, $272 million in FY2023, estimated $253 million in FY2024, and proposed $424 millionin FY2025. FY2025 status quo would be $249 million. General Fund transfers to the PDT & DPTF are $618 million in FY2022, $654 million in FY2023, estimated $671 million in FY2024, and proposed $505 million in FY2025. FY2025 status quo could be $680 million.](/documents/10180/1761231/public+transportation+funds+revenues.png/c4d6aba4-54dc-3cc0-5e72-23a05e2fddaf?t=1715964009138)
Additionally, the long-term fiscal sustainability of the Road Fund is still in question. Although the Road Fund has benefited from new additional revenue from the sales tax on motor fuels, motor fuel tax and motor vehicle and license fee revenues continue to decline. As a result, direct Road Fund receipts in FY25 are projected to be $64 million less than FY24.
Transportation capital funding is losing purchasing power
Finally, the governor’s capital budget proposal is 4.8 percent larger than FY24, growing from $48.7 billion to a proposed $51.0 billion. IDOT continues to receive the most funding in the capital budget, but its percent share of total appropriated capital funding decreased slightly between FY24 and FY25 (from 56.2 percent, or $27.4 billion, in FY24 to 54.5 percent, or $27.8 billion, in FY25). As a result, the increase in IDOT capital appropriations is $428 million, or only 1.6 percent.
Importantly, growth in highway construction costs, which increased almost 12 percent from 2022 to 2023, far exceeds the increase provided for IDOT capital spending. Due to recent supply chain challenges, raw material cost growth, and labor cost growth, these increases are eroding the purchasing power of funds committed to capital infrastructure. Figure 3 shows how both the FY24 and proposed FY25 budgets fail to keep pace with these trends.
Figure 3: Recent trends in highway construction costs and inflation impact the purchasing power of funds budgeted for transportation capital costs.
![Percent change in the capital budget, highway construction cost growth, and inflation. From FY23-24 to FY24-25, capital budget changes from 1.1% to 4.8%. Highway construction costs drops from 13.8% to 7.3%. Inflation decreases from 3.3% to 2.3%.](/documents/10180/1761231/state+budget+and+cost+growth.png/2175ded5-f94d-69eb-2df4-b9379168bde6?t=1715963339582)
Given that Rebuild Illinois — the state’s 2019 comprehensive capital plan which committed $44.8 billion to infrastructure investments over six years — is scheduled to expire in 2025, and a transit budget shortfall is expected in 2026, new, more robust, and more reliable revenue sources are needed to support the operation, maintenance, and investment in our transportation system’s assets. Since its passage, Rebuild Illinois has been critical to preventing the state of good repair backlog from growing, and instrumental as a local match to leverage federal funds through the Infrastructure Investment and Jobs Act (IIJA). Moving forward, federal representatives, state, and local officials must pursue additional transportation funding that continues to advance the state of good repair and responds to operating needs.
Notable transportation projects are moving forward
IDOT’s proposed capital budget does include $300 million in reappropriated funds for the I-290/Blue Line Modernization Project. State support for this corridor is a priority for the region, and CMAP, IDOT, and the Chicago Transit Authority have signed a Joint Statement of Understanding to advance planning and improvement efforts. Other notable projects that received funding in the capital budget include:
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Amtrak’s Chicago Hub Improvement Program, which received a $94 million federal grant through the Federal-State Partnership, funded by the IIJA. In addition to upgrades to Chicago’s Union Station, improvements will include new connections and trackage to better separate passenger and freight trains, as well as the repair or replacement of century-old bridges to deliver faster and more reliable Amtrak and Metra service.
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The 75th Street Corridor Improvement Project, which received a reappropriation of $66.5 million. This is the largest project in the Chicago Region Environmental and Transportation Efficiency (CREATE) Program, and will ultimately eliminate the most congested rail chokepoint in the Chicago terminal — the Belt Junction — where 30 Metra and 90 freight trains cross paths each day.
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A new $44.7 million appropriation that acts as a local match and unlocks an additional $149 million of federal funding to install networks of electric vehicle charging stations through the National Electric Vehicle Infrastructure program under the IIJA.
Following the passage of Public Act 103-0317, which directs IDOT to initiate a prequalification process for the design and development of a South Suburban Airport in Peotone, the proposed capital budget also appropriates funding for the airport and reappropriates $162 million for an interchange at Eagle Creek Road.