TaxNumber.php
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- TaxNumber
- German tax number (Steuernummer, BT-32) as described in "Prüfung der Steuer- und Steueridentifikationsnummer" of the Bayerisches Landesamt für Steuern (ELSTER, as of 2 September 2026): the 13-digit ELSTER format FFFF0BBBUUUUP (NRW: FFFF0BBBBUUUP), the 12-digit federal format without the 0, and the notation of the federal states on tax notices (e.g. 181/815/08155 in Bavaria, 133/8150/8159 in NRW).