Treasury Regulations, Subchapter D, Sec. 41.6109-1
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Sec. 41.6109-1 Identifying numbers
Every person required under §41.6011(a)–1 to make a return must provide the identifying number required by the instructions to the form on which the return is made.
[T.D. 8879, 65 FR 17155, Mar. 31, 2000]
