Here is how to report union dues that are not on a slip:
If you're using TurboTax Online:
Click on the “Find” icon in the top right and search for “Union”. Select “Union or Professional Dues” from the list and then click the “Go” button.
If you're using TurboTax CD/Download EasyStep Interview method:
Select “Payments Profile” from under “Deductions & Credits” in the left side menu. Check off “Union, professional or like dues not reported on a T-Slip”, then click the “Continue” button until you reach the “Union or professional membership fees” page.
If you're using TurboTax CD/Download Forms method:
Click on the “Forms” icon in the blue menu. Search for “Union”. Select “Union dues - Union or Professional Dues paid” from the list and then click the “OK” button.