Entering 0 does not mean anything to the state, IRS or TurboTax. It is something that frequently causes errors. If you have a state name in box 15, but only 0 in box 16 and 17, then the best thing to do is to leave boxes 15 to 17 blank. Otherwise, the program is looking to generate a form for the state but there is no need for the form.
You are not adding any income or making any subtractions by entering 0. It will not have any type of affect on the numbers on your return or the forms that are PROPERLY generated. If you enter a $0 on some forms it will generate a form that should not be included on your return. This in turn would create other issues with your return.
It is much better to just leave blanks where there are 0's.
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