Rev. & Tax. Code, § 18703

(a) Except as otherwise provided in subdivision (b), this article shall remain operative only until January 1 of the seventh calendar year following the first appearance of the Parkinson’s Disease Research Voluntary Tax Contribution Fund on the tax return, and is repealed as of December 1 of that year.

(b) (1) By September 1 of the second calendar year and by September 1 of each subsequent calendar year that the Parkinson’s Disease Research Voluntary Tax Contribution Fund appears on the tax return, the Franchise Tax Board shall determine whether the amount of contributions estimated to be received during the calendar year will equal or exceed the minimum contribution amount for the calendar year. The Franchise Tax Board shall estimate the amount of contributions to be received by using the actual amounts received and an estimate of the contributions that will be received by the end of that calendar year.

(2) If the Franchise Tax Board determines that the amount of the contributions estimated to be received during a calendar year will not at least equal the minimum contribution amount for the calendar year, this article shall be inoperative with respect to taxable years beginning on or after January 1 of that calendar year and shall be repealed on December 1 of that year.

(3) For purposes of this section, the minimum contribution amount for a calendar year means two hundred fifty thousand dollars ($250,000).