The tax with no ceiling: California's SDI
Everyone talks about California's brackets - up to 13.3% all-in once the 1% Behavioral Health surtax kicks in above $1M - but the line that changed paychecks most in recent years is SDI. Since 2024 the State Disability Insurance premium applies to EVERY dollar of wages, no cap, and for 2026 the rate rose to 1.3%. On a $300,000 salary that is $3,900 a year - more than many states' entire income tax - and it is why high California salaries feel the pinch beyond the brackets.
Two softeners are easy to miss. First, the $153-per-allowance exemption credit comes off your computed tax - a credit most quick calculators skip. Second, earn under $18,896 (single) and California withholds no income tax at all under the 2026 low-income exemption.
One honesty note: the FTB publishes its inflation-indexed 2026 schedules in late December; until then this page applies the latest published schedules - the same ones the EDD's official 2026 withholding tables reuse. The update lands in the changelog the day it is out.