"This assessment is enforceable now; however, I have chosen not to seek recovery of this debt until a later date. The reason for not enforcing payment of the debt now is that my enquiries into the claims for overpaid output tax are ongoing"; (2) The review conclusion letter of5 February 2025 says that [the assessing officer] "advised in the decision letter that this assessment is enforceable, and they will not seek recovery of this debt until a later date as enquiries into the claims for overpaid income tax are still ongoing."