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What address should I send the Form 3531 (along with Form 1040 with the wet signature) to?
Form 3531 says " To Reply, use the return address on the mailing envelope or refer to IRS.gov and search "where to file". The envelope was mailed from "Internal Revenue Services, Submission Processing Center, Austin TX 73301". My original 1040 was supposed to (and did) go to "Department of Treasury, Internal Revenue Services, Ogden, UT, [removed]".
I assume I have to mail it to the Austin, TX address above, correct?