Yes, you can file jointly. You are considered as married in the US and allowed to file jointly on your US taxes. You can use TurboTax to file. However, you cannot e-file but must paper file.
Since you are a resident and your wife is not, you can make an election to treat her as a resident. Please see Nonresident to resident. You can use the program to prepare all your tax forms, print them out and attach the statement to your paperwork to submit to IRS by mail.
As far as the tax treaty, you will enter as a negative amount to offset your income which you have already entered. Here are the steps (online):
- After sign in to your program, select Take me to my return
- From the top, go to Wages/Income
- Scroll down all the way to the Less Common Income section, under Misc Income 1099A, 1099C, select Start
- Next screen, scroll down to Other reportable income, select Start
- On the screen, Other Taxable Income, enter info with a negative amount.
