Thanks very much for the reply.
I was looking at the W-4 calculators, but since my spouse is a nonresident that's going to be treated as a resident for tax purposes, they won't have a W-4 since their income is only from Canada, but is going to be taxable in the U.S., so I'm not sure it would be very accurate for changing from MFS to MFJ on the W-4.
And they make much less than me since they are a student and not working full time (and when converting income from CAD to USD makes a difference as well), so we'd still be under the standard deduction for MFJ.
Filing jointly so that our combined income helps me to get health insurance for myself through the marketplace, as we were told as long as we file jointly that we could count joint income towards the requirement.
Though I supposed I could probably go through my pay stubs and change it to MFJ and have them withhold close to the same amount as MFS that's showing on my current year's stubs.
