If, within 60 days of the date of the notice described in Sec. 404.521, the overpaid individual notifies us that he or she is exercising a right described in Sec. 404.522(a) and submits evidence pursuant to Sec. 404.522(b) or requests a waiver under Sec. 404.506, we will suspend any notice to the Department of the Treasury until we have issued written findings that affirm that an overpayment is past due and legally enforceable and, if applicable, make a determination that a waiver request cannot be granted. [56 FR 52469, Oct. 21, 1991, as amended at 62 FR 64278, Dec. 5, 1997]