Protected taxpayer information (‘PTI’) is information the WRA has (or any person to which the WRA has delegated its functions), which could lead to that person being identified.
‘Gwybodaeth warchodedig am drethdalwyr’ yw gwybodaeth sydd gan ACC (neu unrhyw berson y mae ACC wedi dirprwyo ei swyddogaethau iddo), a allai arwain at adnabod y bobl hynny.