TRN or Temporary Reference Number is a unique 15-digit reference number that is generated when you successfully submit all the fields of PART A (first page) of the new registration application and successfully
validate your mobile number and e-mail ID by correctly entering the respective OTPs.

Your TRN is sent to you via SMS and e-mail. It is valid for 15 days from the date of creation.

After TRN is generated, note it down and access PART B of your new registration application on the GST Portal in the pre-login mode by entering the TRN.

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