@nikeshv , As I understand the situation here :
(a) you are H1-B and having met the Substantial Presence Test are considered Resident for Tax Purposes. Taxed by the US on your world income.
(b) your wife is on dependent visa H-4 and thus also considered a Resident for Tax purposes.
At this stage , you have only two valid filing status --- 1. Married Filing Joint ( MFJ) or 2. Married Filing Separate ( MFS). Head of Household status (HoH) requires the presence and support of a qualified child / person AND unmarried or considered unmarried ( living away from spouse for at least the second of half of a tax year ). MFJ is generally the most tax benign fling status for most filers.
If your spouse goes to school, and she changes to F-1 ( independent & student visa ), depending on facts and circumstances at the time she may or may not get exemption from counting presence because she has already been a resident for tax purposes. Her ITIN may be replaced by SSN but F-1 status is not a work visa ( although one does get special permission to work on campus or during OPT/CPT but still must be "full time student" ). Thus I don't see any changes to your filing status. Don't know if I understand what you are trying to achieve. Can you please tell more
Namaste ji
pk
@Anonymous_
