Public schools in the United States are required by federal law to provide eligible students with disabilities a free education suited to their needs. This explainer walks through how the Individuals with Disabilities Education Act, usually called IDEA, defines that right, how a student gets evaluated and served, and what families and schools can do when they disagree.
What IDEA guarantees
IDEA is a federal statute, codified in Title 20 of the U.S. Code, that sets conditions for states and school districts that accept federal special education funds. Its central promise is a “free appropriate public education,” abbreviated FAPE. According to the statutory definition in Section 1401, FAPE means special education and related services that are provided at public expense, under public supervision and without charge to families, that meet state educational agency standards, and that are delivered in line with the child’s individualized education program.
Under Section 1412, states must make FAPE available to eligible children between ages 3 and 21, inclusive. The statute says this includes children who have been suspended or expelled. It also lists limited exceptions, mainly for some students ages 3 to 5 and 18 to 21 where state law or a court order conflicts, and for children already served under the separate early intervention program for infants and toddlers.
Who counts as a “child with a disability”?
Eligibility is not automatic with a diagnosis. The statute, in Section 1401, defines a child with a disability as one who has a listed condition and who, because of it, needs special education and related services. The listed conditions include:
- intellectual disability
- hearing impairment, including deafness
- speech or language impairment
- visual impairment, including blindness
- emotional disturbance
- orthopedic impairment
- autism
- traumatic brain injury
- other health impairment
- specific learning disability
Both parts matter: the condition and the need for specialized instruction. For children ages 3 through 9, the statute lets a state or local agency choose to include children experiencing developmental delays in physical, cognitive, communication, social-emotional or adaptive development, again if they need special education and related services.
How many students are served?
The National Center for Education Statistics reports that in the 2022–23 school year, 7.5 million students ages 3 to 21 were served under IDEA, which it puts at 15 percent of public school students. The agency’s breakdown by category for that year looks like this:
| Disability category | Share of students served under IDEA |
|---|---|
| Specific learning disabilities | 32% |
| Speech or language impairments | 19% |
| Other health impairments | 15% |
| Autism | 13% |
| Developmental delays | 7% |
| Intellectual disabilities | 6% |
| Emotional disturbances | 4% |
Other categories, such as multiple disabilities and hearing, orthopedic or visual impairments, were each 2 percent or less, according to the same data. Category counts reflect how districts classify students, so they are a measure of administrative labels as much as of underlying conditions.
How does an evaluation start?
A child is typically referred by a parent or the school. Before any initial evaluation, the district must get informed consent from the parent. Section 1414 says consent to be evaluated does not amount to consent to receive special education services; that is sought separately before services begin.
Once a parent consents, the statute requires the evaluation to be completed within 60 days, or within a different timeframe if the state has set one. Exceptions apply, for example if the child enrolls in a new district partway through or if a parent repeatedly fails to bring the child in for evaluation. The evaluation is meant to determine both whether the child has a disability and what the child’s educational needs are.
If a parent does not consent to an evaluation, the statute says the district may pursue it through the formal dispute procedures, subject to state law. If a parent refuses services after a child is found eligible, the district is not considered to have violated FAPE for the services that were declined.
Reevaluations follow a rhythm too. According to Section 1414, they occur when the district finds one warranted or when a parent or teacher asks. They may happen no more than once a year unless both sides agree, and at least once every three years unless parent and district agree it is unnecessary.
What is in an IEP, and who writes it?
The individualized education program, or IEP, is the written plan that turns eligibility into specific services. Section 1414 says each IEP must include:
- the child’s present levels of academic achievement and functional performance;
- measurable annual goals, both academic and functional;
- how progress toward the goals will be measured and reported;
- the special education, related services, supplementary aids and program modifications to be provided;
- an explanation of any time the child will not participate with nondisabled peers;
- any accommodations on assessments, with a justification if an alternate assessment is used;
- the projected start date, frequency, location and duration of services; and
- transition planning, which must begin no later than the first IEP in effect when the student turns 16 and be updated annually.
The IEP team includes the parents, at least one regular education teacher if the child is or may be in the regular classroom, at least one special education teacher or provider, a qualified district representative, and someone who can interpret evaluation results. The child may attend when appropriate, and parents or the district may add others. The team must review the IEP at least once a year, and an IEP must be in effect at the start of each school year.
What does “least restrictive environment” mean?
Section 1412 directs that children with disabilities be educated alongside children without disabilities to the greatest extent appropriate. Removal to special classes, separate schools or other settings is allowed only when the nature or severity of the disability is such that education in regular classes cannot be achieved satisfactorily even with supplementary aids and services.
National data show a wide range of placements. According to the NCES, in fall 2022, 95 percent of school-age students served under IDEA were enrolled in regular schools, and 67 percent spent 80 percent or more of the school day in general classes. Another 16 percent spent 40 to 79 percent of the day there, and 13 percent spent less than 40 percent. Time in general classes varied sharply by category: 89 percent of students with speech or language impairments reached the 80-percent mark, compared with 21 percent of those with intellectual disabilities and 16 percent of those with multiple disabilities.
What if a family and school disagree?
IDEA builds in procedural safeguards, set out in Section 1415. The main steps are:
- Prior written notice. The school must notify parents in writing before it proposes or refuses to change a child’s identification, evaluation, placement or FAPE, explaining its reasons and the options it considered.
- Mediation. Voluntary mediation is available, with an impartial mediator paid for by the state. Discussions are confidential, and a signed agreement is enforceable in court. Mediation cannot be used to delay a due process hearing.
- Due process complaint. Either a parent or the school can file a complaint about identification, evaluation, placement or FAPE. Complaints generally must be filed within two years of when the party knew or should have known of the action, though states may set a different limit.
- Resolution session. Before a hearing, the school must convene a meeting within 15 days of receiving the complaint. If the issue is not resolved within 30 days, the hearing may proceed.
- Stay-put. While a dispute is pending, the child generally remains in the current educational placement unless the parties agree otherwise. Discipline cases follow separate rules.
- Appeal. Under Section 1415, a party unhappy with the final decision may bring a civil action in state or federal court within 90 days, and courts may award attorneys’ fees to prevailing parents within statutory limits.
Because states run their own hearing systems within this federal frame, the details of deadlines and procedures can differ. For how that split between federal and state court systems works more broadly, see how federal and state courts differ.
Where the money comes from
IDEA sets rules, but special education is paid for from the same pools as the rest of schooling. Federal, state and local money all play a part. For the mix of local, state and federal revenue and why it varies between districts, see how property taxes help fund local schools. Federal appropriations for education programs also depend on the annual budget process described in how federal funding and shutdowns work.
A framework with local variation
IDEA gives families a set of enforceable steps: consent before evaluation, a written plan with measurable goals, a strong presumption toward inclusion in regular classes, and a path to challenge decisions. What it cannot show on its own is how well any one district applies those steps. Timelines, service levels and dispute outcomes differ across states and districts, and national tallies such as those from the NCES describe who is served rather than how well. Families with questions about a specific child’s situation can start with the school’s special education office or their state education agency, and may consult a qualified education advocate or attorney.
This article is general information about how a federal law works, not legal advice.
Sources: U.S. Government Publishing Office; National Center for Education Statistics
