The information provided by Hal_Al is correct. For Wisconsin, you need to look for a page titled, 'Here's the income that Wisconsin handles differently'. While on that screen, scroll to the Education section and click Start or Update beside College Savings Account. This is where you can enter your 529 plan contributions.
I'm not specifically familiar with your state software. The following is a "generic" answer.
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; usually in the "Here's how Wisconsin handles income differently" section.
Thank you for your answer. Wisconsin does offer this deduction, but Turbotax does not prompt to enter this in the state section and I cannot find a place to enter this information.
The information provided by Hal_Al is correct. For Wisconsin, you need to look for a page titled, 'Here's the income that Wisconsin handles differently'. While on that screen, scroll to the Education section and click Start or Update beside College Savings Account. This is where you can enter your 529 plan contributions.