I am sending my amended tax returns by mail from Germany with FEDEX. I'm confused where I am supposed to send the documents...
International - Where to File Form 1040-X Addresses for Taxpayers and Tax Professionals
Department of the Treasury
Internal Revenue Service
Austin, TX 73301-0215
USA
or is it this address because I am using a private service?
https://www.irs.gov/filing/submission-processing-center-street-addresses-for-private-delivery-servic...
