While Indiana is one State that tends to ignore homeschools and the registration may be voluntary, parents of children with disabilities who choose to homeschool may be held to a higher standard than a parent of a non-disabled child. “Appropriate” is a much different standard than is “equivalent.”
I believe very strongly that it is better to prevent fires than to try to put them out. While Indiana may not “require” homeschoolers to register, it is better for parents of children with disabilities to do so. It is not unheard of for public schools in Indiana to report parents of children with disabilities to Child Protective Services when they homeschool, alleging that the parents are not providing their children with an appropriate education.
Parents of children with disabilities must be proactive, not reactive. I still advise these parents to document everything that the State asks for. It helps protect them. The same may not be true for parents who homeschool children without disabilities. That is not my area of expertise.