父母在美等待綠卡期間,因沒有社安號,需要把他們列為dependents以報稅,請問該如何處理?謝謝指教!
If they have filed I-485, they can apply for EAD and then, use the EAD to apply for the SSN. Or they may apply for ITIN from IRS. See this link for ITIN:
http://www.irs.gov/Individuals/Individual-Taxpayer-Identification-Number-(ITIN)