If at least one of you were in the US for at least 183 days in 2018, you can file a full year resident return as married filing jointly if you print your return and attach a statement (see below for information on this statement), to your return before mailing. You cannot e-file.
You will both need to report your worldwide income for calendar year 2018. You can use the foreign tax credit to help offset double taxation.
If only one of you was in the US for at least 183 days in 2018, then you need to use the statement, Nonresident Spouse Treated as a Resident, on page 9 of Publication 519.
If both of you were in the US for more than 183 days in 2018, then you need to use the statement, Choosing Resident Alien Status on page 8 of Publication 519.
Publication 519
