An "activity" has been defined as any occupation, profession, service, trade or the execution of a contract or any other business for the purpose of making profit.
Income tax is levied on partnerships and companies operating in Qatar whether they operate through branches or in partnership with foreign companies.
The Gregorian calendar is used for Qatar income tax purposes, but a taxpayer may apply to prepare his financial statements for a twelve-month period ending on a day other than 31 December.
The first accounting period may be more or less than twelve months, but it should not be less than six months or more than 18 months. A taxpayer should keep his accounting records in Qatari Riyals unless permission is obtained from the tax administration for them to be kept in a foreign currency.