### Question
Can you define what 12-month period means?


### Answer
**12-month period** is defined as the following in *26 CFR § 1.443-1*:

> the period of 52 or 53 weeks (depending on the taxpayer's 52-53-week taxable year) beginning on the first day of the short period

#### Citation:
  - *26 CFR § 1.443-1*
