California Code, Revenue and Taxation Code - RTC § 6703

(a) Subject to the limitations in subdivisions (b) and (c), the department may by notice of levy, served personally, by first-class mail, or by electronic transmission or other electronic technology, require all persons having in their possession, or under their control, any credits or other personal property belonging to a retailer or other person liable for any amount under this part to withhold from such credits or other personal property the amount of any tax, interest, or penalties due from such retailer or other person, or the amount of any liability incurred by them under this part, and to transmit the amount withheld to the department at such times as it may designate. The notice of levy shall have the same effect as a levy pursuant to a writ of execution.

(b) The person served shall continue to withhold pursuant to the notice of levy until the amount specified in the notice, including accrued interest, has been paid in full, until the notice is withdrawn, or until one year from the date the notice is received, whichever occurs first.

(c) The amount required to be withheld is the lesser of the following:

(d) For the purposes of this section, the term “payments” does not include earnings as that term is defined in subdivision (a) of Section 706.011 of the Code of Civil Procedure or funds in a deposit account as defined in paragraph (29) of subdivision (a) of Section 9102 of the Commercial Code. The term “payments” does include any of the following:

(e) In the case of a financial institution, to be effective, the notice shall state the amount due from the taxpayer and shall be delivered, mailed, or served by electronic transmission or other electronic technology to the branch or office of the financial institution where the credits or other property is held, unless another branch or office is designated by the financial institution to receive the notice.