File jointly! There are virtually NO advantages to filing Married Filing Separately.
By Law, you
cannot file as SINGLE.
B/C/D) In each case, you must file jointly because you filed jointly with your wife on your federal return. But in each case, you will pay taxes ONLY on income earned within the respective state, because your wife is NOT a resident of California.
You will pay taxes on your California return on YOUR California income.
She will pay AZ taxes (filing as a part-year resident) on her AZ income only.
She will pay OR taxes (filing as a part-year resident) on her OR income only.
FICA TAXES:
1) Your wife should NOT be paying FICA taxes. See link below:
Nonresident Spouse Treated as a Resident
2) Once you show her employer's payroll department the link below, they should refund the FICA taxes already withheld, because they (the employer) gets money back as well.
3-4) It does NOT MATTER whether you file jointly or not, your wife is entitled to the FICA refund. If the employer refuses, she can get it back by filing Form 843 in 2009. Your filing status is
irrelevent.