If you are a nonresident alien, you should file a nonresident return for the 3 months you were in the US.
TurboTax does not support nonresident or dual status
returns.
However we have a partnership with Sprintax offering a
nonresident/dual status tax filing solution to our TurboTax customers.
Visit
the TurboTax/Sprintax site for more info or to get started.
However, there is an option to file married filing jointly as full year residents. You and your wife would need to enter your worldwide income for calendar year 2018 (including any income you earned before arriving in the US). The US resident return allows for more deductions and allows a foreign tax credit on income that is taxed both in the US and in another country. If you take this option for filing, you will have to print and manually attach the following statement to your return. You will need to mail your return.
To do this follow
these steps.
1.
Attach a statement to your tax return, signed by both spouses, that states that
one spouse is a nonresident alien and the other is a U.S. citizen or resident
alien, and you are choosing to both be treated as US residents for the tax year.
2.
List the name, address and Social Security number (or Individual Taxpayer
Identification number) of each spouse.
You can find more information on page 8 of the IRS Publication 519
If you do not have a social security number, then you will need to apply for one or if you do not qualify for one, you will need to file Form W-7 to apply for an individual taxpayer identification number (ITIN).
Please see the following information on applying for an ITIN.
https://www.irs.gov/pub/irs-pdf/fw7.pdf
https://www.irs.gov/pub/irs-pdf/iw7.pdf
