26 C.F.R. § 1.106-1

(a) The gross income of an employee does not include the contributions that the employer makes to an accident or health plan for compensation (through insurance or otherwise) to the employee for personal injuries or sickness incurred by the employee, the employee's spouse, the employee's dependents (as defined in section 152 determined without regard to section 152(b)(1), (b)(2), or (d)(1)(B)), or any child (as defined in section 152(f)(1)) of the employee who as of the end of the taxable year has not attained age 27. The employer may contribute to an accident or health plan either by paying the premium (or a portion of the premium) on a policy of accident or health insurance covering one or more of his employees, or by contributing to a separate trust or fund (including a fund referred to in section 105(e)) which provides accident or health benefits directly or through insurance to one or more of his employees. However, if such insurance policy, trust, or fund provides other benefits in addition to accident or health benefits, section 106 applies only to the portion of the employer's contribution which is allocable to accident or health benefits. See paragraph (d) of § 1.104-1 and §§ 1.105-1 through 1.105-5, inclusive, for regulations relating to exclusion from an employee's gross income of amounts received through accident or health insurance and through accident or health plans. For the treatment of the payment of premiums for accident or health insurance from a qualified trust under section 401(a), see §§ 1.72-15 and 1.402(a)-1(e).

(b) Effective/applicability date. The first and last sentences of paragraph (a) of this section apply for taxable years beginning on or after January 1, 2015.