Bo:
1) You are
not obligated to pay Social Security and Medicare taxes while you were a student not on OPT status. That much I am pretty sure about. However, when you entered OPT status, I believe you should have applied for and received a H-1 visa. Once you do get a H-1 visa, you immediately become liable for Social Security and Medicare taxes. However, if you plan to only teach, give lectures or conduct research for a maximum period of three years, then your visa may be another type (maybe J-1). Consult IRS Pub 519 (which can be downloaded from
www.irs.gov) and contact the Human Resource department of the university for whom you work to resolve this issue. If you are F-1 for part of the year and H-1 for the rest of the year, you should seek a refund from the university for the Social Security and Medicare taxes withheld for the period you were on F-1 visa status. If they refuse to refund the withheld taxes, get their refusal in writing and file Form 843 (see page 46, IRS Pub 519) to get the refund from the IRS.
2,3 & 4) Which tax form to file depends on the resolution of question #1:
- If your visa status changes to J-1, I believe you are exempt from ALL tax withholding and liabilities for up to three years.
- If you are on a F-1 visa for the entire year of 2005, then you need to file Form 1040NR or 1040NR-EZ. You cannot claim your wife as a dependent, so there is no requirement for her to get either a SSN or a Individual Tax Identification Number (ITIN). If you file Form 1040NR or 1040NR-EZ, you can claim the China tax treaty exemption for (I believe ) $5,000.
- If you are on a F-1 visa until Sep 2005, then convert to a H-1 visa, you can:
-- file Form 1040NR or 1040NR-EZ with all the restrictions/benefits noted above, OR
-- file as a dual status alien (a complicated process which actually serves no useful purpose and should be avoided if at all possible), OR
-- file as a
resident alien under the First Year Choice. Under this option, you would file Form 1040/1040A/1040EZ. You would need to get your wife an ITIN, because yo0u want to be able to file jointly with her. You would lose the China tax treaty exemption, but that is more than offset by being able to claim the $10,000 standard deduction for a married couple filing jointly. After 2005, if you remain in the United States, you are then forced to file as a resident alien until you return to China.