Ok ... so you told the second employer that you did not need to have any more SS tax withheld from your paycheck and the actually did NOT do any more SS withholding ???? That is not allowed ... they cannot withhold the SS taxes from your paycheck ... they MUST withhold them and you must wait to get the excess refunded on your tax return. If they did that so that they could also escape the employer's portion of the SS taxes then they are in for a surprise when the SS administration catches up with them.
If the actually did put a number in box 3 and a zero in box 4 then you have a mess that the IRS may not like ... you might be able to efile by putting a zero in both boxes 3 & 4 but don't be surprised when you get a notice from the IRS and/or the SS administration later.
