As of 15 September 2025, the Hungarian Tax Authority (NAV) has tightened the validation rules for online invoice data reporting. Fifteen former WARN messages have been reclassified as ERROR, meaning
Attention: Stricter Online Invoice Reporting Rules in Hungary – Check Your Invoicing Software!
2025. September 23.
As of 15 September 2025, the Hungarian Tax Authority (NAV) has tightened the validation rules for online invoice data reporting. Fifteen former WARN messages have been reclassified as ERROR, meaning