Miscellaneous: What was meant by “For some recipients, this may be analogous to Social Security number (SSN) or Employer Identification Number (EIN)” with respect to the TIN?

What was meant by “For some recipients, this may be analogous to Social Security number (SSN) or Employer Identification Number (EIN)” with respect to the TIN?

Some recipients may be individual providers for whom their TIN will be their SSN; similarly, for some entities the TIN will be the EIN.

(Added 10/28/2020)