SWIFT ISO 15022 - Code TXBL Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Taxable Portion: Rate relating to the underlying security for which tax is charged. 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)