If someone asked you right now for your Steuernummer, would you accidentally give them your Steuer-ID instead? You’re not alone.
This is one of the most common tax confusions foreigners face in Germany and it causes real problems on tax returns and registration forms.
In this guide, I’ll explain the difference between the Steuer-ID and the Steuernummer in plain English, show you exactly where to find each one, and tell you what to do if you’ve lost them.
Steuer-ID vs. Steuernummer: Understanding the Key Difference in German Tax Numbers
What Is the Steuer-ID (Identifikationsnummer / IdNr)?
Your Steuer-ID also called the Identifikationsnummer or IdNr is your personal tax identification number in Germany.
It is permanent. It never changes, no matter where you move within Germany.
When you first arrive in Germany and register at the Einwohnermeldeamt (local registration office), the Bundeszentralamt für Steuern (Federal Central Tax Office) automatically sends you a letter with your Steuer-ID. This is the number that stays with you for life.
What Is the Steuernummer (German Tax Office File Number)?
Your Steuernummer is a different number it’s assigned by your local Finanzamt (tax office).
Unlike the Steuer-ID, the Steuernummer can change. If you move to a different region and a new Finanzamt becomes responsible for you, you’ll receive a new Steuernummer. Your Steuer-ID, however, always stays the same.
Think of it this way: your Steuer-ID is you as a person. Your Steuernummer is your file number at the tax office.
Quick Rule: Which Number Goes on Which Form?
If a form asks for IdNr or Steuer-ID use your permanent identification number.
If a form asks for Steuernummer use the number assigned by your Finanzamt.
How the Steuer-ID Compares to Tax IDs in Other Countries
To help put this in context, here’s how the German Steuer-ID compares to equivalent numbers in other countries:
USA Social Security Number (SSN)
UK National Insurance Number (NINO)
Nigeria National Identification Number (NIN)
Pakistan CNIC Number
India Aadhaar Number
Kenya National ID Number
Ghana Ghana Card Number
South Africa South African ID Number
Note: This is not a perfect one-to-one match in every country, as some countries use different systems. But the comparison helps you understand what role the German Steuer-ID plays.
Where to Find Your Steuer-ID and Steuernummer in Germany
How to Find Your Steuer-ID (Tax Identification Number)
Check the letter you received from the Bundeszentralamt für Steuern after your first registration in Germany.
Look at your payslip your Steuer-ID is usually printed there.
Check any official tax documents you’ve received.
If you’ve lost it, you can request it again through the BZSt website (Bundeszentralamt für Steuern). Fill out the online form and they’ll mail it to your registered address.
How to Find Your Steuernummer (Finanzamt Tax Number)
Check your Einkommensteuerbescheid this is your tax assessment letter from the Finanzamt. Your Steuernummer usually appears on the first page at the top.
Any official correspondence from the Finanzamt will also show your Steuernummer.
If you’re self-employed, you will definitely have received your Steuernummer already.
If you can’t find any letters, call your local Finanzamt directly, give them your name and date of birth, and they can confirm it. You can also visit in person.
ELSTER: The Online Platform to Contact the Finanzamt and Retrieve Your Tax Numbers
ELSTER (elster.de) is the official German online portal for communicating with the Finanzamt.
Important: ELSTER registration is not instant. After signing up, you’ll need to wait for an activation code to arrive by post. Once you receive it, you complete the setup using a certificate key.
Once you have access, you can find your Steuernummer inside your ELSTER account and use the platform to communicate directly with your tax office including requesting your tax number if needed.
Many people don’t know ELSTER exists. It’s a very useful tool, especially for foreigners navigating the German tax system.
Final Thoughts: Don’t Confuse Your German Tax Numbers
Getting your Steuer-ID and Steuernummer mixed up is a very common mistake but now you know the difference.
Your Steuer-ID is permanent and tied to you as a person.Your Steuernummer is your file number at the local Finanzamt and can change if you move.
Keep both numbers somewhere safe, check your payslips and Finanzamt letters, and use ELSTER if you need to communicate with the tax office. You’ve got this.
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