If your husband is not a US citizen, you can file MFS without him, provided you haven't made any previous elections to file jointly with him. You can also file jointly with him, applying for an ITIN at the same time as you file next year's return. Sometimes one saves more money than the other, but you can't switch back and forth nilly-willy, so you need to have a clear picture in your mind of not just the benefits in this year, but for the long-term future, including inheritance tax issues and immigration issues.
The best way to plan whether to file jointly or not is to have an income-and-inheritance tax planning session with a qualified dual professional to determine what the short-term and long-term benefits and drawbacks are to your international marriage. You can then make informed decisions to get your life sorted. Total time: 1 hour investment of your time. Think about how much time you'd like to spend sorting out these issues on your own.
