Funding the elective deferral directly from your personal account is a bit improper. It has to be effectively treated as the S corp retaining the elective deferral amount and the S corp making the deposit so that the S corp can report the elective deferral with code in box 7 of the Form 1099-R as required. The amount of the elective deferral must also be excluded from box 1 of your W-2.
