Regardless of which of the four options you choose to submit your tax declaration in Germany, you will need to have the following documents handy:

• Your employment tax statement (Lohnsteuerbescheinigung)
• Your tax ID (Steuer-ID, TIN, or Steuer-Identifikationsnummer)
• Your tax number (Steuernummer)
• Your German bank account details (IBAN, BIC)
• Proof of any income from outside of Germany
• Your receipts of any work-related, special, or exceptional expenses
• Details of your children (if applicable)
• Amount and period for which you received child benefits (Kindergeld)
• Expenses for daycare or education
• Any other income or benefit

Credit: Content by Anshul Srivastava
DISCLAIMER: The information provided here is for general informational purposes only and does not constitute professional tax, legal, or financial advice. I am not a licensed tax consultant under German law. For tailored advice specific to your situation, please contact a certified Steuerberater or tax advisor.