The German Federal Chamber of Tax Advisors (BStBK) has published an 18-page FAQ document addressing implementation challenges for Germany's mandatory B2B e-invoicing regime, which introduced receiving obligations from 1 January 2025 with sending obligations following from 2027-2028 based on turnover thresholds.
The guidance addresses three critical error categories that affect VAT deduction rights: format errors (non-compliance with EN 16931 syntax), business rule errors (violations of logical dependencies within e-invoice data), and content errors (missing or incorrect VAT-required information under sections 14 and 14a of the VAT Act). Format errors during transition periods allow VAT deduction only temporarily, while business rule and content errors affecting VAT mandatory information generally exclude VAT deduction rights.
Technical Validation and Processing
The FAQ establishes that businesses can rely on technical validation results from suitable validation applications for format and business rule compliance, with the KoSIT validator recommended for validation checks. However, validation software cannot replace manual review for content errors such as incorrect tax rates or inadequate service descriptions, requiring visualization tools for human-readable verification.
For hybrid formats like ZUGFeRD, the structured XML data takes precedence over PDF visual components for VAT purposes, though minor technical deviations or supplementary information in the visual layer will not be challenged provided they do not alter the essential content.
GoBD Compliance and Archiving
The guidance clarifies that structured e-invoice datasets must be preserved in their original form to meet GoBD requirements, with machine readability for tax authorities ensured throughout the eight-year retention period. When tax advisers handle client e-invoices, the unchanged structured dataset forwarded to the adviser satisfies archiving obligations without requiring duplicate storage at the original recipient.
E-mails serving purely as transport mechanisms need not be retained, though businesses may choose to preserve them for audit trail documentation. However, e-mails containing business or tax-relevant information beyond mere transmission must be archived electronically.
Sector-Specific Provisions
For construction industry applications, the FAQ permits simplified structured content showing only trade-specific totals until 30 June 2030, provided detailed breakdowns following GAEB standards appear in human-readable attachments referenced within the structured portion. This accommodation recognizes current technical limitations in representing complex construction invoicing within standard EN 16931 formats.
The guidance notes that final invoices and advance payments present ongoing challenges within current data field structures, recommending workarounds such as issuing remainder invoices after deducting advances or embedding missing information in unstructured attachments.
Context
This comprehensive FAQ represents the first detailed professional guidance on Germany's ambitious e-invoicing transformation, addressing practical implementation gaps that emerged during the initial rollout phase. The document's technical specificity reflects the complexity of harmonizing diverse business processes with standardized electronic formats while maintaining VAT compliance, positioning German tax practitioners for the broader European trend toward mandatory B2B e-invoicing.
