SWIFT ISO 15022 - Code TXFR Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Tax Free: Rate relating to the underlying security which is not taxable. Usages Message type Field number Tag MT564 (Corporate Action Notification) 64 92a (Rate) MT564 (Corporate Action Notification) 95 92a (Rate) MT566 (Corporate Action Confirmation) 45 92a (Rate) MT566 (Corporate Action Confirmation) 85 92a (Rate)