There is no federal deduction or credit for K-12 tuition. Some state do allow a deduction on the state return. If yours is one, that question will come up in the state interview.
If you had a distribution from a ESA or 529 plan, K-2 tuition is a qualified expense for federal. You enter the tuition in the 1099-Q section of TT. It does not get entered anywhere on the federal forms, just the TT worksheet, unless some of the distribution is taxable.
