In the case of an insurer not transacting title insurance in this State, the basis of the tax is, in respect to each year, the amount of gross premiums, less return premiums, received in such year by such insurer upon its business done in this State. “Gross premiums” do not include premiums received for reinsurance and for ocean marine insurance. Gross premiums of reciprocal or interinsurance exchanges shall be determined as provided in Section 1530 of the Insurance Code. For purposes of the tax imposed by this chapter, “gross premiums” shall be deemed to include home protection contract fees defined in Section 12740 of the Insurance
Code.