Definition of Tax Year
According to article 8 of Law 4172/2013 it is defined that the tax year coincides with the calendar year, ending on 31.12. of each year.
An exception of this rule make the legal persons having a double-entry bookkeeping, which, if wished, can define as the end of each financial period the 30.06. of each year.
In case that the company's shares (either of a Societe Anonyme or of a Limited Liability Company) of a domestic legal person belong to a foreign legal person at a percentage of over 50%, then, those domestic legal persons, if wished, define as their tax year, the tax year of the foreign legal person, more specifically, 30.09. or 31.03. or 28.10. or at any other date the foreign legal person might have as closing date of its financial period.