US Citizen Married to a Belgium Citizen
Question: I am a US citizen who lives and works in Belgium and recently married a Belgium citizen. I have filed my returns for three previous years when I was single and living and working in Belgium. Can I file MFS?
Answer: Yes, you can file as MFS. I think that you would want to claim him as a dependent which you can do if he is a Non-Resident alien with no US Sourced Income. See Pub 54. However you are going to have to obtain an ITIN or SSN for your spouse.
You should also consider electing for your spouse to be taxed as U.S Person for tax purposes, and then filing joint returns. In that case, even if spouse has income, he will probably be eligible for the foreign earned income exclusion.
To file joint returns, the non-resident spouse MUST have an ITIN. If you file without requesting for ITIN, IRS will deny your joint status. The return is filed on paper along with the W-7 and supporting documentation.
To file separately and claim the spousal exemption, an ITIN is also required.
***Disclaimer: This communication is not intended as tax advice, and no tax accountant -client relationship results**