The situation is that my client submitted a Form 8288-A with an old SSN and received a stamped copy from IRS a while ago. Then, he filed his personal tax return with a new SSN after getting VISA. Is it possible to amend the Form 8288-A and claim the withholding?
In fact, I called IRS and they told me to read the Publication 17, which is not helpful at all lols~.