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The legal basics: one affidavit, one evaluation a year
Under Florida Statute 1002.41, home education starts with a written notice of intent, the affidavit, filed with the district superintendent in the county where you live. In St. Johns County, that is the district's home education office. File within 30 days of the date you start, and it is a one-time filing, not an annual ritual. The notice lists the full legal names, addresses, and birthdates of the children in your program, and the district may not ask for anything beyond that.
Each year, by the anniversary of your registration, you file one of several approved evaluation options: a portfolio review and discussion with a Florida-certified teacher, a nationally norm-referenced achievement test, an evaluation by a licensed psychologist, or another valid measurement you agree on with the superintendent. Parents keep a portfolio of activity logs and work samples available for inspection on 15 days' written notice. That is the whole legal structure. It is genuinely light.
The St. Johns County home education page breaks down the filing, the evaluation options, and the local forms step by step, and it is the first place to go when you are ready to start.