"Wisconsin does NOT allow deduction of HSA contributes from AGI."
Wisconsin has allowed the deduction of HSA contributions since 2011. Contributions made through the employer are removed from Wages in boxes 1, 3, and 5 on the employee's W-2. Contributions made directly to the HSA are deducted on line 12, Schedule 1 (1040).
In either case, since Wisconsin starts with federal AGI, the only way to keep HSA contributions out of WI AGI is to make the contributions an addition on line 4 of Form 1. Clearly, there is no addition for such contributions, as a look at the WI Instructions show.
Please note that in 2018 TurboTax worked the same way.
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