Situation: I worked out of state for a few years (Texas) and have not filed a return during this time. I've never paid much attention to these things since I always claim zero dependents. Something I did not even consider since I have never worked out of state and kept a residence in another (Missouri) state is state taxes. The state I was working in has not state income tax. This can be paid but now I'm concerned about state taxes.
Question: Will they charge me a "significant" penalty when I file taxes? Should I get a Tax Attorney to deal with any issues relating to this?