California Code, Insurance Code - INS § 12387

Where a title insurer organized or incorporated under the laws of any state other than California does business in California, if the laws of the state of its domicile obligate such company to create and maintain an unearned premium reserve for purposes substantially similar to those of this article, any amounts required by the law of such state to be added to such reserve by reason of business done in California shall be deducted from any amounts required by this article to be set aside by such title insurer in an unearned premium reserve for its California business.

The provisions of this section shall be applicable only to title insurers organized or incorporated in those states whose laws provide that a title insurer organized and incorporated under the laws of California and which does business in such other state will be permitted a deduction substantially similar to that provided by this section with respect to any unearned premium reserve requirements for business done in that state.