After you file

If my father hasnt filed 2019 though.......and I was claimed on 2018...will they look at his last return...and base my eligibility ..off of his 2018 return that might have me as an adult dependant? That is what I am concerned about..I read a reputable article that if you were claimed as a dependant in 2018 or 2019 you wont recieve the stimulous.