Use and collection of Social Security numbers
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
We will collect Social Security numbers only when it is necessary and we are authorized to do so. At least annually, the Privacy Act Office will inform employees who are authorized to collect information that:
(a) Individuals may not be denied any right, benefit or privilege as a result of refusing to provide their Social Security numbers, unless the collection is authorized either by a statute or by a regulation issued prior to 1975; and
(b) They must inform individuals who are asked to provide their Social Security numbers:
(1) If providing a Social Security number is mandatory or voluntary;
(2) If any statutory or regulatory authority authorizes collection of a Social Security number; and
(3) The uses that will be made of the Social Security number.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.