The General Assembly is due to convene on May 16, 2018, a month after your taxes are due. That is why TurboTax is giving you this warning. To avoid the possibility of having to amend your North Carolina return, we can help you file an extension. This is done at the end of the state return. TurboTax asks if you want to file an extension and pay what is owed.
I've included a very good article that addresses your concerns:
https://files.nc.gov/ncdor/documents/files/impact_of_17_and_18_fed_leg_02162018.pdf?0IpBJlP1a8zQO4un...
