The W-4 does not change your filing status., The W-4 determines what the withholding rate is from your salary and wages. The employers uses the information on the W-4 to determine how much to withhold from salary.
If you do not have an employer then you will not be completing a W-4.
Your actual filing status is determined by your status at the end of the year, which you declair when you complete the return.
If you are married, and not yet divorced, your choices at the end of the year are:
1. Married seperate
2. Married joint.
3. Head of household , but ONLY IF, you have lived seperate and apart for the last six months of the year, AND ALSO that you have a qualifying child living with you. (or live seperate and apart by written or legal seperation agreement AND have a qualifying child living with you).
If you have been divorced at the end of the year, your only choices for a filing status are:
2. head of household if you have a qualifying child living with you.,
To file a U.S. tax return in any status, you AND your spouse has to have a SSN or ITIN number. If there is no ITIN number, then the person has to apply for one. The application can be turned in along with the tax return.