In the case of an insurer transacting title insurance in this State, the "basis of the annual tax" is, in respect to each year, all income upon business done in this State, except:
"Investments" as used in this subdivision includes property acquired by such insurer in the settlement or adjustment of claims against it but excludes investments in title plants and title records. Income derived directly or indirectly from the use of title plants and title records is included in the basis of the annual tax.
In the case of an insurer transacting title insurance in this State which has a trust department and does a trust business under the banking laws of this State, there shall be excluded from the basis of the annual tax imposed by this section, the income of, and from the assets of, such trust department and such trust business, if such income is taxed by this State or included in the measure of any tax imposed by this State.
The provisions of this paragraph (3) of subdivision (f) shall not apply as to personal income taxes, nor as to ad valorem taxes on real or personal property nor as to special purpose obligations or assessments heretofore imposed by another state or foreign country in connection with particular kinds of insurance, other than property insurance; except that deductions, from premium taxes or other taxes otherwise payable, allowed on account of real estate or personal property taxes paid shall be taken into consideration in determining the propriety and extent of retaliatory action under this paragraph (3) of subdivision (f).
For the purposes of this paragraph (3) of subdivision (f) the domicile of an alien insurer, other than insurers formed under the laws of Canada, shall be that state in which is located its principal place of business in the United States.
In the case of an insurer formed under the laws of Canada or a province thereof, its domicile shall be deemed to be that province in which its head office is situated.
The provisions of this paragraph (3) of subdivision (f) shall also be applicable to reciprocals or interinsurance exchanges and fraternal benefit societies.
A corporate or other attorney in fact of each exchange shall annually compute the amount of tax that would be payable by it under prevailing law except for the provisions of this section, and any management fee due from each exchange to its corporate or other attorney in fact shall be reduced pro tanto by a sum equivalent to the amount so computed.
Cal. Const. art. XIII § 28