The period of 12 consecutive calendar months, which does not correspond with a calendar year.
It is applied by a written notification to a tax office (in Slovakia no later than 30 days after creation of an entity (a company) or at least 15 days before the amendment of the accounting period and in the Czech Republic at least 3 months before the amendment is scheduled). The same accounting period, i.e. a marketing year applies to an entity for one accounting period at the least.
The usual reason to determine a marketing year within an accounting period is to reflect a natural marketing cycle (season) or to adapt to a foreign parent company.