The requirement of subparagraph (3) of this paragraph that the employee is required to accept such lodging as a condition of his employment means that he be required to accept the lodging in order to enable him properly to perform the duties of his employment. Lodging will be regarded as furnished to enable the employee properly to perform the duties of his employment when, for example, the lodging is furnished because the employee is required to be available for duty at all times or because the employee could not perform the services required of him unless he is furnished such lodging. If the tests described in subparagraphs (1), (2), and (3) of this paragraph are met, the exclusion shall apply irrespective of whether a charge is made, or whether, under an employment contract or statute fixing the terms of employment, such lodging is furnished as compensation. If the employer furnishes the employee lodging for which the employee is charged an unvarying amount irrespective of whether he accepts the lodging, the amount of the charge made by the employer for such lodging is not, as such, part of the compensation includible in the gross income of the employee; whether the value of the lodging is excludable from gross income under section 119 is determined by applying the other rules of this paragraph. If the tests described in subparagraph (1), (2), and (3) of this paragraph are not met, the employee shall include in gross income the value of the lodging regardless of whether it exceeds or is less than the amount charged. In the absence of evidence to the contrary, the value of the lodging may be deemed to be equal to the amount charged.
The condition of either paragraph (d)(3)(ii) (A) or (B) of this section is not satisfied if the requirement described therein and imposed either by a foreign government or unrelated person applies primarily to U.S. employers and not to a significant number of third country employers or applies primarily to employers of U.S. employees and not to a significant number of employers of third country employees.
26 C.F.R. §1.119-1