How is the Schedule CA (540) Itemized Deductions Worksheet (line 29) calculated?

My total deduction in line 28 is 30k. I'm single and AGI is over 194,504. Turbotax put 6,000 in line 29 with no explanation. Last year 2017, my AGI is under the limit. I claimed the full 39k. Where does the 6,000 number of this year comes from?

posted

I have figured out. Use the worksheet buried inside 2018 Instructions for Schedule CA (540). Basically every dollar you earn above the AGI limit, it reduce your deduction by 6% down to the floor of 20% the original deduction.