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What does IDNUM stand for?

IDNUM stands for Identification Number

This definition appears somewhat frequently

Samples in periodicals archive:

Proposed Rules--DFARS Transformation Authorization for Continued Contracts (DFARS Case 2003-D052) Proposed change permits contracting activities to assign an additional identification number to an existing contract, by issuing a separate "continued" contract, when continued performance under the existing contract number is not practical for administrative reasons.
Those preparers must provide all other required information such as name, address, relevant employer identification number, the preparer's individual identification number and phone number.
6111 (b)(2) requires taxpayers claiming a deduction, credit or other tax benefit by reason of a tax shelter, to include the tax shelter's identification number on their return.
In December 2003, the IRS implemented significant changes to its individual tax identification number (ITIN) program; see Olmstead, Tax Practice & Procedures, "ITIN Application Changes," TTA, April 2004, p.