26 CFR · Internal Revenue
§ 301.7701-11 — Social security number.
eCFR · current through Aug 10, 2026
§ 301.7701-11 Social security number.
For purposes of this chapter, the term social security number means the taxpayer identifying number of an individual or estate which is assigned pursuant to section 6011(b) or corresponding provisions of prior law, or pursuant to section 6109, and in which nine digits are separated by hyphens as follows: 000-00-0000. Such term does not include a number with a letter as a suffix which is used to identify an auxiliary beneficiary under the social security program. The terms “account number” and “social security number” refer to the same number.
[T.D. 7306, 39 FR 9947, Mar. 15, 1974]
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Nearby Sections
11
§ 301.7701-6
Definitions; person, fiduciary.§ 301.7701-7
Trusts—domestic and foreign.§ 301.7701-9
Secretary or his delegate.§ 301.7701-10
District director.§ 301.7701-11
Social security number.§ 301.7701-12
Employer identification number.§ 301.7701-13
Pre-1970 domestic building and loan association.§ 301.7701-13A
Post-1969 domestic building and loan association.§ 301.7701-14
Cooperative bank.§ 301.7701-15
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