You can not file as single when you are married. Your options to file are married filing jointly or married filing separate. In either case, your wife has to have either a social security number SSN or Individual Taxpayer Identification Number ITIN.
If your spouse does not have an SSN or an Individual Taxpayer ID Number ITIN you'll need to apply for one or the other before you can file your return.
If your spouse qualifies to get an SSN applying for one is easy. Go to Social Security Online, the administration's website, and search for Form SS-5. This form is the paperwork you need to fill out for a Social Security number.
If your spouse does not qualify for an SSN then you'll need to apply for an (ITIN). The IRS issues ITINs to foreign nationals and others who have federal tax reporting or filing requirements but don’t qualify for SSNs.
You can apply for an ITIN at the IRS website by downloading Form W-7.
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