Confirmation of the VAT identification numbers

Mini series: All about the VAT ID – Part 11

In this multi-part series of articles, we would like to introduce you to what a Value Added Tax ID (VAT ID) is. In addition, we would like to cover interesting topics worth knowing about the topic of USt-ID and shed some light on the subject.

We hope you enjoy reading!

Confirmation of VAT identification numbers

From the beginning of 2020, the verification of the VAT identification number (VAT ID) is of key importance. In order to claim tax exemption, it is urgent for companies to verify the VAT ID of the purchaser in many cases.

What is the difference between a simple and a qualified confirmation?

The simple confirmation provides information about the validity of the foreign VAT ID at the time of the request/verification.

With a qualified confirmation, you will also receive information as to whether the company master data you have filed (company name including legal form, company location, postal code and street) match the data registered in the entrepreneur file of the respective EU member state.

Important: A legally compliant verification of the VAT ID must be carried out by a qualified confirmation of the BZSt.

Qualified confirmation from the Federal Central Tax Office (BZSt)

With Optimus USt-ID Prüfer, you have a software-based solution that allows you to quickly and easily request a qualified confirmation from the BZSt by mail. In addition, USt-ID Prüfer allows you to check a large number of company master data electronically, quickly and with little time required.

Free trial version of the Optimus VAT ID checker

Test the Optimus USt-ID checker now for 7 days free of charge and without obligation at The trial period ends automatically after the 7 days.

Do you have any further questions or do you need more information about the USt-ID Checker?

If so, please feel free to contact us by phone at +49 721 98175650 or by email at