Withholding tax no of the Austrian tax authority

A first-time assignment of a withholding tax number (from 1.1.2019) is made when the tax office receives an application for a refund procedure in Austria for the first time, this application has been successfully scanned and then noted in the system. This withholding tax number is sent with a separate letter. The withholding tax number can also be found on all notices issued to the applicant and must be used for all future refund applications.