What Is PL 94-142? Requirements, Origins, and Strain Today

Public Law 94-142, the Education for All Handicapped Children Act of 1975, is the federal law that first guaranteed every child with a disability in the United States the right to a free public education. President Gerald Ford signed it on November 29, 1975, and Congress renamed it the Individuals with Disabilities Education Act, or IDEA, in 1990. It is still the law today and now serves more than eight million children each year.

What the Law Requires Schools to Do

PL 94-142 built special education in the United States on five requirements that still stand.

A Free Appropriate Public Education

Every eligible child is entitled to a free appropriate public education, usually shortened to FAPE. The statute defines it as special education and related services provided at public expense, meeting state standards, and delivered under an individualized education program.¹ Families do not pay for the services their child receives at school, and states cannot use cost as a reason to deny them.

An Individualized Education Program

Each child receiving special education must have a written individualized education program, or IEP. A team that includes the child’s parents, teachers, and school representatives develops the plan, and parents are mandatory members of that team. The IEP records the child’s current academic and functional performance, sets measurable annual goals, lists the specific services the school will provide, and explains how progress will be tracked and reported to parents.² The team meets at least once a year to review and revise it. Once a student turns sixteen, the IEP must also include a transition plan covering postsecondary education, employment, and independent living.

The Least Restrictive Environment

Children with disabilities must be educated with non-disabled children “to the maximum extent appropriate.” A school can move a child out of the regular classroom only when the nature or severity of the disability is such that education there cannot be achieved satisfactorily even with supplementary aids and services.¹ Districts must keep a continuum of placements available, from the regular classroom through special classes, special schools, home instruction, and hospital or institutional settings, so that placement follows the child’s needs rather than administrative convenience.³ In 2022–23, more than 66 percent of children with disabilities spent 80 percent or more of the school day in general education classrooms.⁴

Nondiscriminatory Evaluation

Evaluation materials must be selected and administered so they are not racially or culturally discriminatory. Tests must be given in the child’s native language or usual mode of communication, and no single test or procedure can serve as the sole basis for a placement decision.¹

Due Process for Parents

The law gives parents procedural rights they can use to enforce their child’s entitlement. Schools must send prior written notice before changing a child’s identification, evaluation, or placement, and they must get parental consent before conducting an initial evaluation or starting special education services. When parents and the school disagree, families can request mediation, ask for a formal due process hearing, or file a complaint with the state education agency.⁵

Why Congress Passed It in 1975

Before this law, American public schools were educating only about one in five children with disabilities. Congress found that more than eight million children had handicapping conditions and that one million of them were shut out of public schools entirely, with more than half of the rest receiving services so inadequate they amounted to no real educational opportunity.¹⁶

The exclusion was written into state law. Many states allowed schools to turn away children who were deaf, blind, emotionally disturbed, or intellectually disabled. Children with undiagnosed conditions like learning disabilities got no supplemental help. Families who wanted services often had to travel long distances and pay out of pocket, because public schools refused to serve their children. Many people with significant disabilities were sent to state institutions that provided food, clothing, and shelter but little in the way of education or rehabilitation, and parents were routinely shut out of placement decisions for their own children.⁶

Two federal court cases forced the issue. In Pennsylvania Association for Retarded Citizens (PARC) v. Commonwealth of Pennsylvania, filed in January 1971, plaintiffs challenged a state law that let schools deny services to children who had not reached a “mental age of five years.” In October 1971 the court approved a consent decree striking down the exclusionary law, ordering free public education for children with intellectual disabilities, and creating procedural protections for parents.⁷ That decree became a template for the provisions Congress later wrote into PL 94-142.⁸

The next year, Mills v. Board of Education of the District of Columbia extended the principle to all disabilities. The lead plaintiff, twelve-year-old Peter Mills, was among thousands of D.C. children who had been expelled or excluded because of mental, behavioral, physical, or emotional conditions.⁹ Judge Joseph Waddy ruled on August 1, 1972, that no child could be denied a public education because of a disability, rejecting the school board’s argument that it lacked the money to serve them. Constitutional rights, the court held, could not be denied on grounds of expense.¹⁰ By 1973, right-to-education lawsuits were pending or recently decided in twenty-one states, and Congress moved to write a federal solution. The bill, S. 6, was sponsored by Senator Harrison Williams of New Jersey and twenty-three cosponsors and passed both chambers by veto-proof margins.¹¹

How the Law Has Changed Since 1975

Congress has amended PL 94-142 several times. Each round left the core framework in place and expanded who was covered or updated what schools had to do.

The 1986 amendments (PL 99-457) required states to provide early intervention services for children with disabilities from birth. Before that, coverage started at age three. These provisions are now known as IDEA Part C, and instead of an IEP each family receives an Individualized Family Service Plan.⁶¹²
The 1990 amendments (PL 101-476) renamed the statute the Individuals with Disabilities Education Act, added autism and traumatic brain injury as separate disability categories, and required transition planning in every student’s IEP.
The 1997 amendments (PL 105-17) emphasized access to the general curriculum, allowed states to extend the “developmental delay” classification up to age nine, and established formal mediation for disputes.
The 2004 amendments (PL 108-446) aligned IDEA with the No Child Left Behind Act, required early intervening services for struggling students not yet identified for special education, raised qualification standards for special education teachers, and increased accountability for outcomes.

The 2004 amendments were the last major reauthorization, making IDEA one of the longest-lapsed education statutes in federal law.¹³

What the Law Looks Like Today

The reach of PL 94-142 has grown substantially. In the 1976–77 school year, the first year under the law, about 3.7 million students ages three through twenty-one received special education services. That figure reached 4.7 million by 1990–91, 7.1 million under Part B in 2018–19, and more than eight million by 2022–23 when infants and toddlers served under Part C are included, a group that alone numbered more than 441,000.⁶

Outcomes have improved as well. In 1994–95, 52 percent of students with disabilities ages fourteen through twenty-one graduated with a regular diploma and 34 percent dropped out. By 2017–18, nearly 73 percent left school with a regular diploma and the dropout rate was 16 percent.⁶ The workforce grew from about 695,000 special education teachers and related service personnel in 2005–06 to more than 942,000 by 2017–18.

Where the Law Is Under Strain

Three pressures are worth knowing if you rely on IDEA services or work in a district that provides them.

Funding. When Congress passed PL 94-142, it committed to covering 40 percent of the extra average per-pupil cost of educating children with disabilities. That promise has never been kept. Federal funding has historically covered roughly 18 percent of the cost and by some more recent estimates has fallen below 13 percent.¹⁴¹⁵ Local districts absorb the difference, which shows up as rationed services, delayed evaluations, and personnel shortages. Part B appropriations grew from about $5 billion in fiscal year 2000 to roughly $14.2 billion in fiscal year 2023, but that has not kept pace with the number of students served or the cost of services.¹⁶ In April 2025, Representative Jared Huffman and Senator Chris Van Hollen reintroduced the IDEA Full Funding Act, which would require mandatory annual increases over ten years to reach the 40 percent commitment.

Disproportionality. Research indicates that Black students are more likely to be classified with intellectual disabilities or emotional disturbances, Hispanic students with specific learning disabilities, and American Indian and Alaska Native students face higher dropout rates and less time in regular classroom settings.¹⁷ Current federal regulations require states to use risk ratios to analyze disparities, and districts found to have significant disproportionality must reserve 15 percent of their IDEA Part B funds for coordinated early intervening services and publicly report their policy revisions.¹⁸

Staffing. Districts across the country report critical shortages of special education teachers, school psychologists, and speech-language pathologists. Those shortages produce larger caseloads, missed evaluation deadlines, and IEPs that are written but not fully carried out.¹⁹

Where the law is housed. Following a March 2025 executive order directing the dismantling of the U.S. Department of Education, the administration announced in June 2026 that it would transfer oversight of special education programs from the Department’s Office of Special Education and Rehabilitative Services to the Department of Health and Human Services through an interagency agreement, without congressional approval.²⁰ Education Secretary Linda McMahon said existing legal rights for students would not change and that the Education Department retains statutory responsibility for the programs.²¹ Organizations including The Arc, the National Association of School Psychologists, and the Council for Exceptional Children have opposed the move, and recent budget legislation restricting the transfer of IDEA funds to other agencies has raised questions about how the arrangement will hold up.

1
U.S. Government Publishing Office. Education for All Handicapped Children Act of 1975, 89 Stat. 773
2
Center for Parent Information and Resources. Contents of the IEP
3
Wrightslaw. LRE FAQs and Inclusion
4
U.S. Department of Education. About IDEA
5
Center for Parent Information and Resources. Parental Rights Under IDEA
6
U.S. Department of Education. IDEA History
7
Civil Rights Litigation Clearinghouse. PARC v. Commonwealth of Pennsylvania
8
Public Interest Law Center. Pennsylvania Association for Retarded Citizens (PARC) v. Commonwealth of Pennsylvania
9
Justia. Mills v. Board of Education, 348 F. Supp. 866
10
Embryo Project Encyclopedia. Mills v. Board of Education of District of Columbia (1972)
11
Gerald R. Ford Presidential Library. Memorandum From the Office of Management and Budget on S. 6
12
IDEA Infant Toddler Coordinators Association. At a Glance: An Introduction to Part C
13
Brookings Institution. Trump Administration Weighs Future of Special Education Oversight and Funding
14
National Council on Disability. Broken Promises: The Underfunding of IDEA
15
Office of Representative Jared Huffman. Huffman, Van Hollen Reintroduce Bicameral Legislation to Fully Fund Special Education
16
U.S. Department of Education. IDEA Grants to States (Part B, Sec. 611)
17
American Bar Association. Education Department’s Proposal Weakens Oversight of Racial Disparities in Special Education
18
U.S. Department of Education. OSEP Monitoring: Significant Disproportionality Reporting Under IDEA Part B
19
The Hill. IDEA Funding Gap Widens
20
Chalkbeat. Trump Administration Moves Sped, Civil Rights From Education Department
21
K-12 Dive. Takeaways From the Ed. Dept.-HHS Special Education Agreement