"He would have known all the deductible state taxes when he did federal the first time."
That's true, if he was a W-2 employee and entered his 2017 W-2 properly including Boxes 15-19, and if he properly entered any estimated state tax payments or other state tax payments made during 2017. Maybe it's me that needs that coffee.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
