Steuer-ID vs Steuernummer: What's the Difference and Which Do You Need?

Two Numbers, Endless Confusion

Germany has two different tax identification numbers, and almost every expat mixes them up. Here is the definitive explanation.

Steuerliche Identifikationsnummer (Steuer-ID)

What It Is

An 11-digit number assigned to every person registered in Germany. It is your personal, permanent tax identifier — like a Social Security number for tax purposes.

When You Get It

• Automatically mailed to you 2-4 weeks after your Anmeldung (address registration)
• Arrives in a letter from the Bundeszentralamt fuer Steuern (Federal Central Tax Office)
• You receive it once in your lifetime — it never changes, even if you move cities or change jobs

Format

11 digits, e.g.: 12 345 678 901

Who Needs It

• Your employer: To process your payroll and withhold the correct income tax
• Your bank: To apply the Sparerpauschbetrag (tax-free savings allowance) and report interest income
• Your Krankenkasse: For reporting insurance contributions to the tax office
• The Kindergeld application: Familienkasse requires the Steuer-ID of both parents and the child

What If You Lost It?

You can request it again from the Bundeszentralamt fuer Steuern:
- Online at bzst.de (takes 4-6 weeks by mail)
- It is also printed on your last Steuerbescheid (tax assessment notice)
- Your employer's HR department likely has it on file

Steuernummer

What It Is

A tax file number assigned by your local Finanzamt (tax office). Think of it as your "case number" at a specific tax office.

When You Get It

• Assigned when you file your first tax return or when you register a business
• Can also be assigned automatically by the Finanzamt based on your Anmeldung
• If you move to a different Finanzamt district, you get a new Steuernummer

Format

Varies by state. Typically 10-13 digits, e.g.: 123/456/78901 (with slashes)

Who Needs It

• Used on your Steuererklaerung (tax return) to identify your tax file
• Freelancers and businesses: Required on every invoice (Rechnung)
• Finanzamt correspondence: All letters reference your Steuernummer
• Steuerberater: Your tax advisor needs it to file on your behalf

What If You Do Not Have One Yet?

If you have never filed a tax return and do not run a business, you might not have a Steuernummer yet. File your first return — the Finanzamt will assign one and print it on your Steuerbescheid.

Quick Comparison

| | Steuer-ID | Steuernummer |
|---|---|---|
| Digits | 11 | 10-13 (varies by state) |
| Assigned by | Bundeszentralamt fuer Steuern | Local Finanzamt |
| When | After Anmeldung (automatic) | After first tax return or business registration |
| Changes? | Never | Yes, when you move to a different Finanzamt district |
| Used for | Employer, bank, Kindergeld | Tax returns, invoices, Finanzamt correspondence |
| Format | Numbers only | Numbers with slashes |

Which One Does Your Employer Need?

Your employer needs your Steuer-ID (the 11-digit permanent one). They use it to pull your electronic tax deduction features (ELStAM) from the Finanzamt, which determines your tax class and allowances.

If your employer asks for your "Steuernummer," they almost certainly mean your Steuer-ID. Clarify which one they need to avoid delays.

A Third Number: USt-IdNr.

If you are a freelancer or run a business, you may also encounter the Umsatzsteuer-Identifikationsnummer (USt-IdNr.) — your VAT identification number. This is separate from both the Steuer-ID and Steuernummer and is used exclusively for EU cross-border business transactions.

Take Action

Upload your tax documents to Clario and get a plain-English summary — free, no credit card needed.