Parents are often offered one plan name or the other as if they were two sizes of the same thing. They are not. An IEP and a 504 plan come from two different laws, qualify children in different ways, and deliver different kinds of help.
An IEP, an Individualized Education Program, comes from the IDEA, the federal special education law. It is built around teaching: if your child qualifies, the school must provide specially designed instruction and the services your child needs to benefit from it, under 34 CFR Part 300.
A 504 plan comes from Section 504 of the Rehabilitation Act, a civil rights law. It is built around access: a student with a disability must not be shut out of the school's programs, and must receive a free appropriate public education under 34 CFR §104.33. It usually delivers accommodations rather than separate teaching.
For an IEP, your child must fit one of the disability categories in the IDEA, and, because of that disability, need special education. Both parts must be true. A child can have a medical diagnosis and still not qualify, if the school finds the child does not need specially designed instruction.
For a 504 plan, the test is broader. Your child must have a physical or mental condition that substantially limits a major life activity, such as learning, reading, concentrating, or thinking, under 34 CFR §104.3. No set category, and no need to need special teaching. That is why some children who do not qualify for an IEP still qualify for a 504 plan.
An IEP delivers instruction. It is a detailed written plan with present levels, measurable goals, the special education and related services to be provided, how progress will be measured and reported, and accommodations for tests, under 34 CFR Part 300.
A 504 plan delivers access. It is usually a shorter plan listing accommodations: changes to seating, timing, testing conditions, materials, or the environment that remove a barrier, while the child learns the same general curriculum. It does not usually include teaching goals. Both plans should be in writing and shared with teachers. Keep your copy, and check it is actually happening in class.
You can ask in writing for an evaluation under either law, or ask for both to be considered. Under the IDEA, once the school receives your signed consent, the evaluation must be conducted within 60 days unless your state has set its own timeframe (34 CFR §300.301(c)). Under Section 504, the school must evaluate a child it believes has a disability before deciding placement (34 CFR §104.35). If the school refuses under either law, ask for the reasons in writing.
In practice, a child who qualifies for an IEP does not usually also need a separate 504 plan, because the IEP can include accommodations as well as instruction, and Section 504 protections still apply. Schools therefore normally serve an eligible child through the IEP alone. If you are offered a 504 plan instead of an IEP, ask in writing why the school believes your child does not need specially designed instruction.
Knock on the IEP door first if your child needs teaching itself to change: different instruction, a specialist's time, or goals apart from the general curriculum. Knock on the 504 door first if your child can learn the general curriculum once a barrier is removed: time, seating, testing conditions, or access to materials. If you are not sure, ask in writing for your child to be considered under both. Asking does not lock you in.
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