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An ERO, or Electronic Return Originator, is a person or company that prepares and electronically files tax returns on behalf of taxpayers. In the context of Form 8453-CORP, which is the U.S. Corporation Income Tax Declaration for an IRS e-file Return, the ERO is the entity that prepared and submitted the corporate tax return electronically. They're responsible for ensuring the information is accurate and complete before it's sent off to the IRS.