Reg. B governs when no other reg does:
Sec. 202.13 Information for monitoring purposes.
(a) Information to be requested—(1) A creditor that receives an application for credit primarily to purchase (or to refinance a home purchase loan) a dwelling occupied or to be occupied by the applicant as a principal residence, where the extension of credit will be secured by the dwelling, shall request as part of the application the following information regarding the applicant(s):
(i) Ethnicity, using the categories Hispanic or Latino, or not Hispanic or Latino; and race, using the categories American Indian or Alaska Native, Asian, Black or African American, Native Hawaiian or Other Pacific Islander, and White;
(ii) Sex;
(iii) Marital status, using the categories married, unmarried, and separated; and (iv) Age.
(2) Dwelling means a residential structure that contains one to four units, whether or not that structure is attached to real property. The term includes, but is not limited to, an individual condominium or cooperative unit and a mobile or other manufactured home.
(b) Obtaining information. Questions regarding ethnicity, race, sex, marital status, and age may be listed, at the creditor’s option, on the application form or on a separate form that refers to the application. The applicant(s) shall be asked but not required to supply the requested information. If the applicant(s) chooses not to provide the information or any part of it, that fact shall be noted on the form. The creditor shall then also note on the form, to the extent possible, the ethnicity, race, and sex of the applicant(s) on the basis of visual observation or surname.
(c) Disclosure to applicant(s). The creditor shall inform the applicant(s) that the information regarding ethnicity, race, sex, marital status, and age is being requested by the federal government for the purpose of monitoring compliance with federal statutes that prohibit creditors from discriminating against applicants on those bases. The creditor shall also inform the applicant(s) that if the applicant(s) chooses not to provide the information, the creditor is required to note the ethnicity, race and sex on the basis of visual observation or surname.
You may also wish to look at the commentary for this section.
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