@andylitax cannot fully answer --- are you a US Resident for tax purposes or are you a Non-Resident Alien living in the USA or a Non-Resident Alien living abroad with US income; which country are you a citizen/resident of ?
Generally , I would say you still have to file , even if the tax liability is zero -- there also may have been withholding requirements based actual facts and circumstances.
So please answer with the details asked for
