No, there isn't an IRS form for the affidavit. As @tagteam stated earlier in this thread:
You can easily generate a demand letter yourself and mail it to the noncompliant beneficiary(ies). There are also a number of sites with templates for affidavits and all you need to do is have them notarized.
Treasury Regulations § 301.6109-1 addresses this situation under (c) Requirement to furnish another's number
If the person making the return, statement, or other document does not know the taxpayer identifying number of the other person, and such other person is one that is described in paragraph (b)(2)(i), (ii), (iii), (vi), (vii), or (viii) of this section, such person must request the other person's number. The request should state that the identifying number is required to be furnished under authority of law. When the person making the return, statement, or other document does not know the number of the other person, and has complied with the request provision of this paragraph (c), such person must sign an affidavit on the transmittal document forwarding such returns, statements, or other documents to the Internal Revenue Service, so stating.
@pbakenshake
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