I have some stock options that I need to urgently sell. This will make me jump my current tax bracket. But, I do have a wife who is currently on a F1 visa and doesn't have a ssn. If she and I file taxes jointly then my tax bracket will be higher than if I were filing individually.=====>>>>>>>>>>>>> You , as a us citizen/ green card holder,file as married filing separately and your spouse files nonresident tax return or You may file joint return as residents. Both of you must report both us source and worldwide income for the year on your fed/state returns. If she and you file taxes jointly then your tax bracket will be lowerer than if you were filing individually as single.
Can I somehow file taxes jointly with her? Will she need an itin?=======>>>>>>>yes; F1 visa holders can get SSN. So your spouse should get it. Filing joint return will not affect the green card or citizenship process. So, if your spouse has a SSN or ITIN, yes, it will usually be better to file jointly.