Under the new tax laws, your 1099-DIV expenses are not deductible. You can no longer deduct investment fees.
"Investment fees, custodial fees, trust administration fees, and other expenses you paid for managing your investments that produce taxable income are miscellaneous itemized deductions and are no longer deductible."https://www.irs.gov/publications/p529#en_US_2018_publink10004392