30 million adults in California x $1,000 x 12 months = $360 billion / year.

20% of adults are on Medicaid though, so if they're excluded it's $288 billion / year.

California's total current budget is around $210 billion. So taxes would more than double.

On average each adult's taxes would go up by the amount of the UBI. The specifics of who would bear more of a tax burden would depend on how it's taxed. Under this plan, taxing consumption and excluding Medicaid recipients would mean the tax burden would fall disproportionately on low income households.