These investment advisor fees were deductible on both Federal and state taxes in 2017 if using itemized deductions.
California chose to not conform to the changes implemented at the Federal Level with the tax changes of 2017 effective in 2018. Your investment advisory fees as well as all previously acceptable California itemized deductions are still allowable for California Income Tax.
California Itemized Deductions
California Law (R&TC section 17076)
California conforms, under the PITL, to the federal rules relating to miscellaneous itemized
deductions under IRC section 67, as of the specified date of January 1, 2015,246 with
modifications, but does not conform to the federal suspension of all miscellaneous itemized
California supports most of the (pre-2018) IRS-approved itemized deductions you can claim on your Federal income tax, but with some California-specific limitations. Before you attempt to claim any itemized deductions you must verify that it is allowed on your California tax return, even if you were able to claim it on your Federal return.
A variety of expenses can be itemized as deductions on your California tax return. Here's a list of some of the most popular itemized deductions.