Nonresident alien individuals present in the U.S. for too many days in a calendar year may be classified as residents for federal income tax purposes under the substantial presence test. If such individuals are stuck in the U.S. due to medical conditions, those days of presence may be excluded in making the days computations pursuant to statutory provisions.
There are nonresident alien individuals who are in the U.S. during the current COVID-19 crises who are unable to leave due to travel bans and similar limitations, but not due to their own illness. It is uncertain whether the medical exception applies to them.
As a relief measure, the IRS has issued a Revenue Procedure. . .