Is there a tax credit for not having a vehicle?

Not for tax year 2021 or tax year 2022.

If signed by Gov. Gavin Newsom as expected, SB 457 would create a credit that takes effect with the 2023 tax year, allowing each household member who does not have a registered vehicle to receive a $1,000 tax credit. To qualify, single filers must earn less than $40,000 per year.

IF it ever gets passed into law that will start in 2023 ...

https://www.smartcitiesdive.com/news/california-sb457-car-free-tax-credit/631194/#:~:text=California%20residents%20who%20don't,state%20Assembly%20passed%20last%20week.

Along the same line, I wonder if they would ever consider crediting school taxes for anyone who does not currently have kids in school.    I suspect a lot of folks would support that.