As an Authorized ERO (Electronic Return Originator), we receive notification from the IRS on a Form 9325.
IRS Publication 1345 is periodically updated but no changes have been made in over 4 years.
The latest IRS Revenue Procedures (rev procs) refer to it: “The ERO must, at the request of the taxpayer, provide the Declaration Control Number (DCN) and the date the electronic individual income tax return data was accepted by the IRS. Form 9325, Acknowledgement and General Information for Taxpayers Who File Returns Electronically, may be used for this purpose.”
This document is what we use to track the status of all electronically filed tax returns whether they be Corporate, Partnership, Estates and Trusts, Individual Income Tax, etc.