@ammon626 well congratulations are in order.
(a) what is your own status--- US person ( citizen/GreenCard/ Resident for Tax purposes ) or NRA ?
(b) If you were not a US person ( citizen/GreenCard/Resident for Tax purposes ), then we need to know which country you are from ? There may be tax treaty considerations.
(c) To amend a return ( from single ) to MFJ, your spouse needs to have a tax id ( TIN --- SSN / ITIN ). However, generally the TIN is not retroactive ( except for the current filing season ).
(d) Also note that if you filed as single while being married ( and filing form 1040 as a US person ), you may be subject to perjury jurat.
Having said all of the above , please answer my questions and I will circle back and help -- yes ?
