In box 20 of my w2s for locality name it shows CASDI and in box 18 it shows my Gross pay. I dont think I have ever had anything in those boxes. Is this normal?

[marsmedina]

Box 14 is llisted as "GROSS $" with my gross pay listed, which is the same as box 18. 

[Fern]

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.