Cal. Rev. & Tax. Code § 24311

For taxable years beginning on or after September 1, 2020, and before January 1, 2023, gross income does not include grant allocations received by a taxpayer pursuant to the California Microbusiness COVID-19 Relief Program that is administered by the Office of Small Business Advocate pursuant to Article 9 (commencing with Section 12100.90) of Chapter 1.6 of Part 2 of Division 3 of Title 2 of the Government Code.