Quote Originally Posted by David Merrill View Post
It might be wiser to consider the SSA is the source for the Taxpayer ID #. Then it does not matter any more about benefits, it is a matter of identifying you, or not.
Sure, but I think Taxd2death was more about what one might be able to do if you've already provided a SSN to a place you work - what remedies are then available to remove that participation.

Would 26 CFR 31.3402(P)-1(d) "...desires that the [voluntary withholding] agreement terminate on a specific date" be applicable here?