Trust through performance

Long-term partnerships are the best proof of successful collaboration. Here is a selection of companies we have helped optimize their indirect tax processes in SAP.

Our clients

K+S Aktiengesellschaft
Lanxess AG
Bilfinger AG
STIEBEL ELTRON GmbH & Co. KG
Vattenfall GmbH
Raiffeisen Waren GmbH
R. Stahl AG
Drägerwerk AG & Co. KGaA
Tennet TSO GmbH
Hochland SE

"A reliable partner for us in the field of tax technology (tax determination)—technically excellent, professional, and always dependable, even when it comes to complex requirements."

Lanxess AG

"With kallman, we have found an experienced partner that delivers reliably, works in a structured manner, and supports our VAT tax determination solution with competence and high expertise, both during implementation and in ongoing operations."

Drägerwerk AG & Co. KGaA

Book reference

The book ‘Umsatzsteuer in SAP S/4HANA’ is now regarded as an indispensable standard work for anyone involved in VAT processing in SAP systems. The book provides a sound basis for anyone who wants to understand, configure and optimise VAT processes in SAP S/4HANA. In the fourth edition, the three kallman partners Lars Bohn, Adam Dubielecki and Martin Grote have expanded ‘Umsatzsteuer in SAP S/4HANA’ to include many current topics.

Practical instructions with clear examples
Dealing with complex VAT scenarios (e.g. in the context of cross-border deliveries)
Market overview of third-party solutions
Suitable for SAP consultants, tax experts and IT managers

Find out more about the book on the Rheinwerk Verlag website or contact us directly if you have any questions or need support. We look forward to accompanying you on your way to optimal VAT processing!

The fourth edition of ‘Umsatzsteuer in SAP S/4HANA’ was published on 7 January 2025 and can be ordered on the Rheinwerk Verlag website: Link

"A must-have for all those who deal with VAT in the SAP environment. Including the latest information on how a Tax Compliance Management System (Tax CMS) can be set up on the basis of SAP Risk and Assurance Management."

Chief Product Owner, SAP SE