After your tax return has been fully processed you can change it to a joint return provided both spouses agree to file jointly.
https://ttlc.intuit.com/questions/1899507-how-do-i-amend-a-separate-return-to-married-filing-jointly
A 1040X cannot be e-filed. It must be printed and mailed. It will take about 2-4 months for the IRS to process an amended return.
Wait about 3 weeks and you can check the status of your amended return:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1
After your tax return has been fully processed you can change it to a joint return provided both spouses agree to file jointly.
https://ttlc.intuit.com/questions/1899507-how-do-i-amend-a-separate-return-to-married-filing-jointly
A 1040X cannot be e-filed. It must be printed and mailed. It will take about 2-4 months for the IRS to process an amended return.
Wait about 3 weeks and you can check the status of your amended return:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1