Belgian e-Invoicing is Live: Early Lessons from the First Weeks in Practice

The go-live of e-invoicing in Belgium has highlighted key challenges for tax managers, including sudden data quality issues, the complexity of maintaining control during the grace period, and the necessity for collaboration between tax, finance, and IT departments. Many organizations are discovering that their previously accepted data practices are no longer adequate, as automated validation now rejects invoices missing mandatory information.
The grace period (January 1, 2026, to March 31, 2026) offers operational relief but also complicates governance, with some organizations running multiple invoice flows, including compliant e-invoices and temporary workarounds. This situation raises critical questions about transparency and the resolution of exceptions, as failing to coordinate across departments could turn the grace period into a compliance risk.
The implementation of tax technology is crucial for providing visibility and early error detection across invoice flows, allowing teams to align responsibilities and stabilize processes. Effective e-invoicing requires not only passing technical checks but also ensuring that the data is meaningful and compliant, underscoring the ongoing importance of tax expertise in a largely automated environment.

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E-invoicing