If you put money into a 529 saving plan, you can take a deduction and lower your Ohio income on contributions you made to a 529 savings plan. This deduction is limited to $4,000 per beneficiary per year. Contributions exceeding the $4,000 limitation may be deducted on future years' returns until fully utilized, subject to the annual limitation of $4,000 per beneficiary.
When you go through the Ohio state return, on the screen titled Here's the income that Ohio handles differently, scroll down to Education. From there you can enter your 529 plan contributions.

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