Married but complicated

I am married, but not stayed for a single day together in same state.

 

I live and work in a State Tax state and spouse lives and works in a state with no state payroll tax.

 

Spouse might not share their W2

 

can I change my tax filing from married and filing jointly to married single ?

 

will I be fined ( because payed less tax of joint filing ) ?

 

Am I responsible for any of her taxes if filing married filing single ?