SWIFT ISO 15022 - Code TAXR Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Tax Refund: Relates to a tax refund from the authorities on the associated corporate action event. Usages Message type Field number Tag MT564 (Corporate Action Notification) 51 22F (Indicator) MT566 (Corporate Action Confirmation) 37 22F (Indicator)