• a valid original identity card or passport (with current registration confirmation if you are resident in Germany)
• an insurance certificate for export license plates (issued only in paper form)
• the registration certificate part I (vehicle registration document)
• the registration certificate part II (vehicle registration document)
• the valid test certificate of the main inspection (HU), if an HU was already required for the first time, see the registration certificate part I if applicable;
• if the vehicle is still registered: the official registration numbers (number plates)
• an EC card
• the appointment confirmation

Additionally, if the vehicle owner does not submit the application in person:

• a legibly completed power of attorney in the original and a legible color copy of the ID card (identity card or passport) of the principal
• the authorized representative's ID card in the original
• Original SEPA mandate from the principal for the collection of vehicle tax, if applicable, with an account holder other than the applicant (if the tax is to be paid not by the owner themselves but by a so-called third party willing to pay, a copy of the third party's ID card is required).

additionally for companies:

• Company proof in the form of a commercial register extract, business registration or association register extract (for associations)

Additionally for new vehicles:

• CoC paper or EEC certificate of conformity