What is the Evidence-Based Funding (EBF) model?

State funding formulas calculate an 'adequacy target' for each district based on student needs (poverty, English learners, special education) and compare it to available local resources. Districts furthest from their target receive the most new state funding.

What does the funding gap mean?

The funding gap is the difference between what a district needs (its adequacy target) and what it currently receives from all sources. A district at 90% of its adequacy target has a 10% funding gap. States aim to bring all districts to at least 90% adequacy over time.

How are EBF tiers determined?

Districts are grouped into four tiers based on their percentage of adequacy: Tier 1 (below 70%), Tier 2 (70-90%), Tier 3 (90-100%), and Tier 4 (above 100%). New state funding flows primarily to Tier 1 and Tier 2 districts to close the biggest gaps first.

Bolingbrook, IL School Funding Gaps & Adequacy

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School Funding — FY2026i

NCES

State funding formulas determine whether your school districts have enough money. Here's where they stand.

How School Funding Works

State funding formulas calculate an Adequacy Target for each district, the estimated cost to provide an adequate education. Districts are then compared against that target.

Districts are assigned to Tiers 1-4 based on their percentage of adequacy. Tier 1 districts (most underfunded) receive the largest share of new state funding.

Tier 1: Below 60% of adequacy

Tier 2: 60% to below 90% of adequacy

Tier 3: 90% to below 100% of adequacy

Tier 4: At or above 100% of adequacy

Source: State Education Funding Data

Avg % of Adequacyi

91.5%

Adequacy Gapi

$191.2M

Funding vs. Needi

Indian Prairie C U SCH Dist 20484.06%

$329.2M funded$391.6M target

Plainfield School Dist 20278.59%

$286.1M funded$364.0M target

Naperville C U Dist 203123%

$282.1M funded$229.3M target

Valley View CUSD #365u81.3%

$195.6M funded$240.6M target

Community High School Dist 99119.38%

$90.2M funded$75.6M target

Woodridge School Dist 6889.93%

$39.9M funded$44.3M target

Lemont-Bromberek CSD 113a96.29%

$36.1M funded$37.5M target

Lemont Twp H S Dist 210103.89%

$21.6M funded$20.8M target

District Detail

Indian Prairie C U SCH Dist 204Tier 2

84.06% funded$62.4M gap

60-90% of adequacy — receives moderate new state funding

The state estimates it costs $391.6M to adequately educate all students in this district. The district currently has $329.2M in resources — that's 84.06% of what it needs. There's a $62.4M gap between what the district has and what it needs.

What it needsi

$391.6M

What it hasi

$329.2M

From the statei

$43.5M

This district is better funded than 60% of districts statewide.

Plainfield School Dist 202Tier 2

78.59% funded$77.9M gap

60-90% of adequacy — receives moderate new state funding

The state estimates it costs $364.0M to adequately educate all students in this district. The district currently has $286.1M in resources — that's 78.59% of what it needs. There's a $77.9M gap between what the district has and what it needs.

What it needsi

$364.0M

What it hasi

$286.1M

From the statei

$141.0M

This district is better funded than 45% of districts statewide.

Naperville C U Dist 203Tier 4

123% funded

At or above 100% of adequacy — fully funded

The state estimates it costs $229.3M to adequately educate all students in this district. The district currently has $282.1M in resources — that's 123% of what it needs. This district meets or exceeds its funding target.

What it needsi

$229.3M

What it hasi

$282.1M

From the statei

$12.7M

This district is better funded than 91% of districts statewide.

Valley View CUSD #365uTier 2

81.3% funded$45.0M gap

60-90% of adequacy — receives moderate new state funding

The state estimates it costs $240.6M to adequately educate all students in this district. The district currently has $195.6M in resources — that's 81.3% of what it needs. There's a $45.0M gap between what the district has and what it needs.

What it needsi

$240.6M

What it hasi

$195.6M

From the statei

$51.4M

This district is better funded than 53% of districts statewide.

Community High School Dist 99Tier 4

119.38% funded

At or above 100% of adequacy — fully funded

The state estimates it costs $75.6M to adequately educate all students in this district. The district currently has $90.2M in resources — that's 119.38% of what it needs. This district meets or exceeds its funding target.

What it needsi

$75.6M

What it hasi

$90.2M

From the statei

$4.0M

This district is better funded than 90% of districts statewide.

Woodridge School Dist 68Tier 2

89.93% funded$4.5M gap

60-90% of adequacy — receives moderate new state funding

The state estimates it costs $44.3M to adequately educate all students in this district. The district currently has $39.9M in resources — that's 89.93% of what it needs. There's a $4.5M gap between what the district has and what it needs.

What it needsi

$44.3M

What it hasi

$39.9M

From the statei

$4.2M

This district is better funded than 66% of districts statewide.

Lemont-Bromberek CSD 113aTier 3

96.29% funded$1.4M gap

90-100% of adequacy — receives limited new state funding

The state estimates it costs $37.5M to adequately educate all students in this district. The district currently has $36.1M in resources — that's 96.29% of what it needs. There's a $1.4M gap between what the district has and what it needs.

What it needsi

$37.5M

What it hasi

$36.1M

From the statei

$1.8M

This district is better funded than 72% of districts statewide.

Lemont Twp H S Dist 210Tier 4

103.89% funded

At or above 100% of adequacy — fully funded

The state estimates it costs $20.8M to adequately educate all students in this district. The district currently has $21.6M in resources — that's 103.89% of what it needs. This district meets or exceeds its funding target.

What it needsi

$20.8M

What it hasi

$21.6M

From the statei

$884K

This district is better funded than 80% of districts statewide.

Statewide Tier Distributioni

Tier 1: 36

Tier 2: 579 (yours)

Tier 3: 96 (yours)

Tier 4: 221 (yours)