Which State to file taxes?
I am 26 years old and have been attending Graduate School in TX for the last two years. My parents live in OK and I have left my address the same as theirs for mail purposes while in Graduate School. While in Texas I have been renting an apartment, paying utilities and earning an income. All income earned has been in TX. In addition, I failed change my drivers license until this month, Feb. 2020. I graduated in August 2019, stayed in TX, then accepted a full time position in October 2019 in TX. Do I only file a TX federal tax return, or do I need to file an OK state return too given I did not change my address on my W-2 with the University and employer while in school? I do have one W-2 with the correct address. I'm just not sure given TX does not have a state tax, but OK does.