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Yes, the period (.) separators in the GIIN are required. The GIIN, or Global Intermediary Identification Number, is a 19-character identification number assigned by the FATCA Registration System to financial institutions and direct reporting non-financial foreign entities. The format of the GIIN is specified as XXXXXX.XXXXX.XX.XXX, which includes periods as separators. These periods account for three characters in the 19-character identification number and are essential for the correct format of the GIIN.
Sources:
Publication 5216 (8/2020)
Publication 1179 (10/2023)
