CBIC had earlier mandated quoting of Document Identification Number (DIN) on all communications with taxpayers to enhance transparency. However, documents issued through the GST common portal already carry a Reference Number (RFN), which is system-generated, unique, and verifiable online. These RFNs include key details like the date, type of communication, and issuing office.

Given this, CBIC has now clarified that quoting DIN on such communications is not necessary. Any communication issued via the common portal with a valid RFN will be treated as a proper and valid notice. Accordingly, the earlier circulars mandating DIN (Circular No. 122/41/2019 and 128/47/2019) stand modified to this extent.