WTH aims to make processes more efficient and transparent. Starting January 1, 2025, we will exclusively create, process, and archive electronic invoices. The hybrid data format “ZUGFeRD” (Central User Guide of the Forum for Electronic Invoicing Germany) will be used. This ensures WTH invoices are machine-readable and can be automatically processed by recipients via the embedded XML file. At the same time, the invoice will also be available as a visual document (PDF file) for recipients who cannot process electronic invoices.