IRS system issues a unique 9-digit Employer Identification Number (EIN) for all businesses operating in US for the tax administration purpose. IRS e-file system uses a combination of your EIN and your name as a unique identifier for the name control for validation purpose. On an e-filed return, if a taxpayer’s unique ID doesn’t match the IRS records, it’s rejected. Please note that SSN cannot be used to file form 2290.
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