Kindergarten is not mandatory in Wisconsin! However, compulsory attendance in Wisconsin begins the year the child turns 6 on or before September 1st, so your child must be enrolled in school: public, private, tribal, or homeschool. If you are homeschooling, you must include this child on a PI-1206 Homeschool Report. See When and How to File the PI-1206 Homeschool Report.
Because kindergarten is not compulsory, there is not a space on the PI-1206 Homeschool Report for children in kindergarten. You will need to decide whether to designate this child as “first grade” or “ungraded.” The grade designation in no way restricts what educational materials or activities you, as the homeschool administrator, provide for your child.
If you decide to enroll a child who turns 6 on or before September 1st in public, private, or tribal school kindergarten (or any other grade), and later decide to withdraw them, you will need to file the PI-1206 Homeschool Report at the proper time. More information can be found on the Withdrawing from School page.