PreK-12 Education

Volume XI of the Fully Funding the EBF series continues CTBA’s modeling of fully funding the EBF to 90% of Adequacy. The update for the FY 2026 Enacted budget uses the shortfall from the ISBE EBF calculations for FY 2026 (released in August of 2025). The Report looks at four different funding scenarios and explains fluctuations in local revenue for districts in the past few years. The analysis includes the full funding model based on the current minimum increase of $300 million annually both with and without considering inflation, if the state were to up the funding to $500 million annually, as well as the annual amount to fund the EBF by FY 2027 as the statute requires.

Volume IX of the Fully Funding the EBF series continues CTBA’s modeling of fully funding the EBF to 90% of Adequacy. Volume IX uses the proposed Fiscal Year 2025 General Fund Budget appropriations for the Evidence-Based Funding formula, but uses a projected shortfall based on the ISBE EBF calculated shortfall for FY 2024 (released in August of 2023). The new release maintains the four scenarios, including the full funding model based on an increase of $500 million annually using Scenario 2: Funding the EBF on a Fully Inflation-Adjusted Basis, By Making a Nominal Minimum Target Level Increase Annually.

After seven years of implementation, including six that included New Tier Funding, or new year-over-year funding, Illinois' funding formula for K-12 Education—the Evidence Based Funding for Student Success Act, or EBF—has worked towards its promise of closing the drastic funding gaps between school in property-rich and property-poor districts,  as well as between schools in predominantly white communities and schools that serve predominantly Black and Latinx students, putting the funding responsibility on the state to ensure equity for districts with less local resources. The EBF accomplishes this by distributing new K-12 funding to those districts that are furthest away from having adequate resources, and furthest away from hitting their respective "Adequacy Targets" --which is the amount the research indicates is required to provide the level of education the students they serve need to succeed academically.

The EBF replaced a formula that was based on a one-size fits all "Foundation Level" of per-pupil funding that was both inadequate in amount and inequitable in distribution. In fact, Illinois' disinvestment had been so inadequate that local property tax revenue became the primary method from which education was funded. Now, seven years later, the EBF has drastically changed public education funding allocation and has worked to close Adequacy Funding Gaps for students across all regions of the state and from all demographics by continuing to increase the state level investment each year.

Volume VIII of the Fully Funding the EBF series continues CTBA’s modeling of fully funding the EBF to 90% of Adequacy, which aligns with the Illinois State Board of Education’s methodology. Volume VIII uses the new tier funding and the calculated shortfall based on the ISBE EBF calculated shortfall for FY 2024 (released in August 2023) as well as references Illinois Department of Revenue Corporate Personal Property Replacement Tax from FY 2019-FY2023.

Volume VII of the Fully Funding the EBF series continues CTBA’s modeling of fully funding the EBF to 90% of Adequacy, which aligns more closely with the Illinois State Board of Education’s methodology. Volume VII uses the propsed Fiscal Year 2024 General Fund Budget appropriations for the Evidence-Based Funding formula, but uses a projected shortfall (similar to that of Volume V), based on the ISBE EBF calculated shortfall for FY 2023 (released in August 2022). The new release maintains the four scenarios but adds the full funding model based on an increase of $500 million annually using Scenario 2: Funding the EBF on a Fully Inflation-Adjusted Basis, By Making a Nominal Minimum Target Level Increase Annually

After six years of implementation, five of which included new year-over-year funding, Illinois’ school funding formula – the Evidence Based Funding for Student Success Act, or EBF – has worked towards its promise of closing Illinois’ drastic funding and achievement gaps between schools in property-rich and property-poor districts, as well as between schools in predominantly white communities and schools that serve predominantly students of color. The EBF accomplishes this by distributing new K-12 funding to those districts that are furthest away from having the resources to fund their respective “Adequacy Targets” – which is the amount the research indicates is required to provide the level of education the students they serve need to succeed academically.

The EBF replaced an old formula that was based on a one-size-fits-all “Foundation Level” of per-pupil funding that was both inadequate in amount and inequitable in distribution. Indeed, the state’s historic investment in K-12 has been so inadequate that local property tax revenue became the primary method of funding education. But after six years of the EBF, the formula has proven that it is working as intended to counter historic inequities by investing more at the state level each year, closing Adequacy Funding Gaps for students in every region of the state and of every race and ethnicity.

Beginning in 2017, Illinois decision makers replaced one of the least-equitable K-12 public education funding formulas in the country with the Evidence-Based Funding for Student Success Act, or EBF. The EBF commits to implementing best practice in school funding by investing a year-to-year increased Minimum Target Level of $300 million each fiscal year.  Illinois met the Minimum Target Level for increased year-to-year state funding of K-12 education in each of the first three fiscal years—FY 2018, 2019, and 2020—during which the EBF was implemented. That streak now stands to be broken, however, as the FY 2021 General Fund Budget, which recently passed, does not increase K-12 funding under the EBF, but rather holds it level with FY 2020.

The Impact of Underfunding the Evidence-Based Funding Formula report analyzes the steps the EBF takes when the Minimum Target Level is not satisfied and how limited or no new Tier funding would impact districts by Tier, income level, race, and geography. The report also analyzes how state funding would be allocated if the state is unable to hold funding level with the prior fiscal year, resulting in a reduction in funding for the EBF.