What is the tax ID (Steueridentifikationsnummer)?

The tax ID (Steueridentifikationsnummer) is a unique identification number all German residents receive. This is the number the tax office (Finanzamt) uses to identify you. You receive that number after registering your address in Germany. Do not confuse the tax ID with the tax number (Steuernummer). For more details, see this guide.

The tax ID is also called a Steuerliche Identifikationsnummer, Persönliche Identificationsnummer, Identifikationsnummer, Steuer-IdNr.IdNr or SteuerID.