Section 19343 Of Article 1. Claim For Refund From California Revenue And Taxation Code >> Division 2. >> Part 10.2. >> Chapter 6. >> Article 1.

. At the expiration of 90 days from the mailing of the notice specified in Section 19342, the Franchise Tax Board's action upon the disallowance of the interest shall be final unless within the 90-day period, the taxpayer appeals in writing from the action of the Franchise Tax Board to the board.