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What should I do to secure an accurate TIN from my Payee?

It would be useful to refer to the Instructions for Form SS-4, lines 1 and 2, (https://www.irs.gov/pub/irs-pdf/iss4.pdf) to determine what name may have been submitted to the IRS. Ultimately, the name submitted for TIN Matching should be the legal name from line 1 or the trade name from line 2 if a return using this name has already been filed and accepted. The legal name of the entity will create the best potential to match because IRS maintains prior name controls for an EIN even after a name change has been made.

For additional information see Publication 2108a, Online TIN Matching Program.