Cabinet Decision No. 39 of 2019, Article 27, requires resident taxpayers and permanent establishments to notify the Authority of any changes affecting their tax status within 30 days. This includes changes in ownership, activity nature, address, or branch count. Notifications are only effective from the date the Authority is informed, and failure to notify may result in financial penalties. It also covers shifts to special tax regimes or participation in exempt projects. This ensuring the Authority's records accurately reflect the taxpayer's current operational and legal structure.