Union dues will be entered in your Federal portion of TurboTax, and then automatically transfer over to your New York return.
To get to this screen, follow the instructions below:
When logged into Turbo Tax:
1.) Click Federal
2.) Deductions & Credits
3.) Employment Expenses
4.) Job Expenses for W-2 Income
5.) Click Yes to having these types of expenses, and then answer the questions that follow
6.) When you arrive at the screen that says Any other expenses? Enter your Union Dues here.
The union dues will automatically be transferred over to your IT-196, which is your resident, nonresident, and part-year resident itemized deductions form onto line 21 (Unreimbursed Employee Expenses - job travel, union dues, etc).
Unfortunately, while they are technically 100% deductible this year, they are only such if you Itemize your returns on your New York state return.
If your Standard Deduction is still higher than the sum of all of your Itemized Deductions, it will automatically apply your standard deduction on line 34 of your New York IT-201 return in order to give you the most benefit. This is why you may not see anything change when you enter the information.
I'm certainly not seeing this happen for me, now even in October!
Because the Union Dues is not even a standard entry field in the online TurboTax, rather it is an add-on "Other Job Expenses" that you type in, there's no way for the NY return to know this is eligible expense for the NY addition adjustment to the itemized deductions. There are only 4 obscure categories allowed, union dues undoubtedly being the most common!