Under the new tax law, investment expenses aren't deductible on your federal return, but some states still allow you to deduct them on your state return.
To enter your Investment Expenses -
Click on Federal Taxes (Personal using Home and Business)
Click on Deductions and Credits
Click on I'll choose what I work on (if shown)
Scroll down to Retirement and Investments
On Other Investment Expenses, click on the start or update button