Investors & landlords

No - Do not change the $0 that TurboTax carried over from your federal return.  To be on the safe side, go ahead and prepare the NC nonresident return even though it shows no net income.  

The North Carolina Individual Income Tax Instructions state that you need to file a NC return if  "your total gross income from all sources both inside and outside of North Carolina exceeds the amount in the Filing Requirements Chart on Page 6 for your filing status.