You have to crack the UPSC Civil Servant exam to become an IRS officer. The way to become an IRS officer goes as the following: Clear 10+2 with at least 60% marks.  Complete graduation from a recognized university.  Crack the two stages of the UPSC exam - Prelims and Mains.  Qualify for the interview round.  Now choose the Indian Revenue Service as your field of work to become an IRS officer.