### Question
How is the "12-month period" defined?


### Answer
The term **12-month period** is defined in *26 CFR § 1.443–1* as follows -

> 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*
