On 1st October 2020, the Hungarian Tax Authority has published the development documentation of the Online Invoicing 3.0 version and the new XML schema definitions. Based on these the necessary developments relating to the conversion can be initiated. The referred documents can be found on the following link: https://onlineszamla.nav.gov.hu/dokumentaciok.
Upload of further supporting materials, such as sample XMLs, the English language specification document is in progress, these are not yet available.
The current 2.0. version continues to be applicable, the mandatory conversion deadline to the 3.0 version is 1st April 2021. We recommend starting the necessary developments in due course.
We do hope that we could be at your service with this information. Should you have any further queries, please feel free, to contact us!