26 C.F.R. § 301.6723-1
Example 1. Individual A, who has two dependents ages 7 and 9, files his 1990 Form 1040 in 1991. The Form 1040 requires him to provide the TINs of his two dependents, which A fails to do. Because A fails to comply timely with two requirements to include on his return the TIN of another person, a $50 penalty under paragraph (a) of this section is imposed on A for each of the two failures, for a total penalty of $100.
Example 2. In 1991 Individual B opens with Bank X an account which pays reportable interest under section 6049. When B opens the account, Bank X requests that B provide his TIN on a Form W-9. B does not provide his TIN as required by § 301.6109-1(b) . As a result B fails to comply timely with a specified information reporting requirement under paragraph (a) of this section for furnishing his TIN to another person. Therefore, a $50 penalty is imposed on B under paragraph (a) of this section for the failure. See section 6721(a) for the penalty to which X may be subject if X files a Form 1099-INT (relating to payments of interest) for calendar year 1991 without B's TIN. See section 3406(a)(1)(A) which requires X to impose backup withholding on reportable payments of interest to B's account.
Example 3. In 1991 Individual C is a nonresident alien with an account inside the U.S. with Bank Z. The account pays interest that would be reportable under section 6049 but for the fact that it is paid to a nonresident alien. Under section 6109 and § 301.6109-1(b) , Bank Z is required to request the TIN from C. C claims that he is a nonresident alien and that his account is not subject to information reporting under section 6049. Because of this, C contends he is not required to provide any TIN information. As a result of this discussion, Bank Z then requests C to provide it with a Form W-8 in order for C to certify that he is a nonresident alien which C fails to do. C fails to comply timely with a specified information reporting requirement under paragraph (a) of this section to furnish his TIN to another person. Therefore, a penalty is imposed on C under paragraph (a) of this section for the failure. See section 6721(a) for the penalty that may be imposed on Z if Z files a Form 1099-INT for calendar year 1991 without C's TIN. See section 3406(a)(1)(A) under which Z is required to impose backup withholding on reportable payment of interest to C's account.
Example 4. In 1991 Partnership D opens with Bank Y an account that pays reportable interest under section 6049. When D opens the account, Y requests the partnership's employer identification number (EIN) on a Form W-9 as required under § 301.6109-1(b) . The partnership provides its EIN on the Form W-9. Y files an information return with respect to D for the 1991 calendar year. Subsequently, the Internal Revenue Service later notifies Y that D's EIN is incorrect as defined under section 3406 and § 35a.3406-1(a)(6). D fails to comply timely with a specified reporting requirement under paragraph (a) of this section of furnishing its correct EIN to another person. Therefore, a penalty is imposed on D under paragraph (a) of this section for the failure. See section 6721(a) for the penalty to which Y may be subject if Y files a Form 1099-INT for calendar year 1991 without D's correct EIN. See section 3406(a)(1)(B), which requires Y to impose backup withholding on reportable payments of interest to B's account when the Internal Revenue Service or a broker has notified Y that the EIN is incorrect.
26 C.F.R. §301.6723-1