- From September 2025, the validation rules for the NAV Online Invoice system will become stricter. The changes will affect not only invoicing software but also accounting and taxation processes. New rules can be tested from September 1, 2025, allowing companies and developers to prepare. The aim is to ensure more accurate and reliable invoice data, benefiting both the authorities and businesses. The changes include the introduction of new WARN messages, the removal of some existing WARN messages, and the conversion of some WARN messages to ERROR messages, which will block data submission if not corrected. The NAV has specified which warnings will become blocking errors, such as issues with performance period dates, missing elements in XML, and incorrect tax markings. These changes necessitate a review of invoicing processes.
Source: grantthornton.hu
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.
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