New federal tax codes allows parents to use money in 529 plans to pay for tuition for Kindergarten – 12th grade. According to the Washington Post, starting with the 2018 tax year, you can withdraw $10,000 per student, per year from a 529 plan to pay for primary or secondary education. Unlike funding for college, however, this money can be spent only on school tuition, not textbooks, computers, or other fees or activities.
More information can found in this NY Times article.