### Question
How does the law define 12-month period?


### Answer
Under *26 CFR § 1.443-1*, **12-month period** is defined as:

> 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*
