ViDA is here. What changes for your invoices, ERP and accounting

The EU's ViDA package changes VAT rules in stages. An ERP team needs to distinguish domestic invoicing, cross-border B2B transactions and platform sales before choosing an implementation date or interface.

Match the timetable to the transaction

OSS and IOSS clarifications apply from January 2027. Single VAT Registration measures follow in July 2028 alongside rules for short-term accommodation and road passenger transport platforms. Member States may defer those platform measures until January 2030. Digital reporting for cross-border B2B transactions starts in July 2030.

Confirm domestic scope and effective dates under the relevant country's law. The EU timetable alone does not set the deadline for every Slovak invoice.

Define the message and delivery contract

EN 16931 defines an e-invoice semantic model. UBL and CII are supported syntaxes. The applicable profile adds rules and required fields, while delivery requirements are specified separately. Where structured invoicing is required, a PDF for human readers does not replace the data message. An XML export alone does not prove correctness.

Map partner identifiers, VAT components, currency and order references to their sources. Give each field an owner. Before replacing the ERP, ask whether the existing supplier can support the required profile and interface.

Test failure as well as normal delivery

• Send a standard invoice, a credit note and a foreign-currency document. Check totals and references to the original.
• Send the same message twice. The importer must not create a second invoice.
• Interrupt the connection after acceptance. Delivery status should prevent blind retries.
• Omit a required field, then correct the rejected document. Give the error an owner and a traceable state.

Set retention, access and archive requirements from applicable law. Keep acknowledgements and corrections, and test archive recovery so documents remain findable after migration.

Our software modernization service starts with the current process. A technical assessment can establish the interface and data changes needed for a specific scheme.