Cal. RTC § 18416.5

(a) The Franchise Tax Board may, by regulation, implement an alternative communication method that would allow the Franchise Tax Board, at the request of the taxpayer or the taxpayer’s authorized representative, to provide notification to the taxpayer in a preferred electronic communication method designated by the taxpayer that a notice, statement, bill, or other communication required or authorized under Part 10 (commencing with Section 17001), this part, or Part 11 (commencing with Section 23001) is available for viewing in the taxpayer’s limited access secure folder on the Franchise Tax Board’s internet website and would allow the taxpayer or the taxpayer’s authorized representative to file a protest, notification, and other communication to the Franchise Tax Board in a secure manner. Prior to obtaining the consent of a taxpayer to participate in the alternative communication method authorized by this section, the Franchise Tax Board shall advise the taxpayer or the taxpayer’s authorized representative of the ramifications of electing to receive notifications from the Franchise Tax Board in the manner selected and of failing to take appropriate action in response to one or more of those notifications.

(b) Sending electronic notification to a taxpayer or the taxpayer’s authorized representative pursuant to the taxpayer’s request made in accordance with regulations authorized under subdivision (a) shall not be considered a violation of Section 19542 or 19542.1. Any electronic notification provided to a taxpayer using the alternative communication method authorized by this section shall include plain language advising the taxpayer that a failure to act may cause the taxpayer to forego procedural or administrative rights to challenge the proposed action.

(c) Notwithstanding any other law regarding the use of United States mail, any notice, statement, bill, protest, and other communication from the Franchise Tax Board to a taxpayer or the taxpayer’s authorized representative and from a taxpayer or the taxpayer’s authorized representative to the Franchise Tax Board pursuant to the alternative communication method authorized by this section shall be treated as if it were mailed by United States mail, postage prepaid.