The bos 9 checkbox applies if you file Form 1040NR or 1040NR-EZ and didn’t receive wages as an employee subject to U.S. income tax withholding.
If this applies to you, print out a copy of Form 4868 and mail it into the IRS. The form and instructions can be found by clicking on this link: https://www.irs.gov/pub/irs-pdf/f4868.pdf
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