State tax filing

I’m not sure, I’ve never seen this request before when I’ve completed my taxes. 
It asks if I’m single, then jumps down to ask me if last years return was filed and if it was for a full 12 months (YES), and was I a US citizen last year (YES) and then since I answered yes to both, it tells me I need to enter last years WV tax liability after credits. 
it just doesn’t tell me how to find that value.