State tax filing

Maybe & it depends.  When you signed up for the Marketplace insurance you had to indicate an estimate of how much you would make during the year.  Based on that amount you were given a possible tax credit you could use in full or part to reduce the monthly payments.  If your income is less you could be eligible for a credit on your return.  If the income is more you may owe back some/part of the credit you took in advance.