There is no federal deduction for making a contribution to a 529 plan. Some states allow a deduction on the state return. If your state is one, it will come up in the state interview.
For Indiana it’s at credits and taxes. Scroll down and select Indiana CollegeChoice 529 Plan. Screen shot at https://ttlc.intuit.com/community/college-education/discussion/no-place-to-put-in-indiana-529-for-tu...
