CASDI Is California State Disability Insurance. It is deductible if you itemize deductions on schedule A. In 2015, the rate is 0.90% and the salary cap is $104,378 for a maximum tax of $939.40. The amount of the tax is usually reported in Box 14 on the W-2.
Box 18 shows the total of your salary used to compute a local tax, if a local tax applies.
