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c- 20% of the declared taxable income resulting from producing, mining, design and engineering, and design and assembly activities is tax exempted provided that the related exploitation permit is acquired.
d- The declared profit resulting from industrial and mining activities appropriated for the renovation, expansion, completion of existing industrial and mining units and / or being reserved for setting up new industrial and mining units is tax exempt.
e- 100% of income resulting from the export of finished industrial goods, agricultural products, and the related convertible & supplementary industry products and 50% of income resulting from export of other goods and commodities intended for promoting the export of non-oil commodities are tax exempt. The list of tax exempt products is suggested by the Ministries of Economic Affairs & Finance, Commerce, Agriculture, Construction, and Industry during each development plan and approved by the Council of Ministers.
f- 100% of income resulting from transited commodities through Iran is tax exempt provided that no modification is made to the nature of the commodity(s) in question.
 
g- Companies with enlisted shares on the stock exchange are exempted from 10% corporate income tax, provided that the related equity transactions are registered by the stock exchange agents. Moreover, the dividend allocated or paid to shareholders is tax exempt provided that:
a) the share of the company are enlisted;
b) the shareholder' share of equity is less than 5%;
c) the number of shareholders within the company is not less than 100.
h- All tourist institution, agencies, hotels etc. which have obtained the related permit from the Ministry of Culture and Islamic Guidance are exempted from 50% of their annual tax (5 star hotel are an exception to this rule).
 
- FTZ
Any business or industrial activity in the Free Trade Zones is exempted from any kind of taxation (inclusive of revenue tax or taxes levied on profits) for a period of 15 years. The laborer working in the production units is exempted from income tax. The import of the following goods will be exempted from any customs duty, but not from the service expenses or fees
a- Raw material, any goods consumable or applied in the course of any investment projects machinery together with their spare parts
b- Tools and construction material used for building, setting up and establishing production, commercial, service, residential or infrastructure units (exclusive of decoration appliances or furniture).

TAX YEAR
For a corporate entity the tax year is defined as an Iranian year starting from 1st of Farvardin (21st of March) and ending on the last day of Isfand (20th March). However, in the case of legal entities with different financial year it is possible to assume their financial year as the basis for tax assessment. The deadline for submitting the returns and accounting records is 4 months after the end of the financial year.