Internal Revenue Service - (512) 499-5875 - 3651 S I H 35, Austin, TX Internal Revenue Service - (512) 499-5127 - 825 E Rundberg Ln, Austin, TX Tax Professional Examiners Brd - (512) 305-7300 - 333 Guadalupe St Ste 2-520, Austin, TX. Bummerang · 9 years ago. Thumbs up. 0.