### Question
Can you define what controlled group of corporations means?


### Answer
**Controlled group of corporations** is defined as the following in *26 CFR § 1.1563-1T*:

> any group of corporations which is either a *parent-subsidiary controlled group* (as defined in paragraph (a)(2) of this section), a *brother-sister controlled group* (as defined in paragraph (a)(3)(i) of this section), a *combined group* (as defined in paragraph (a)(4) of this section), or a
*life insurance controlled group* (as defined in paragraph (a)(5) of this section). 

#### Citation:
  - *26 CFR § 1.1563-1T*
