It is considered a business expense of your self-employment business. It should be listed under "Other Common Business Expenses" and then go to the bottom and list it as Other Misc. Expense.
"Your work-related educational expenses must be for education that:
- maintains or improves your job skills; OR
- is required by your employer or by law to keep your salary, status or job.
The education cannot
- be part of a program that will qualify you for a new trade or business; or
- be needed to meet the minimal educational requirements of your trade or business."
Source:
https://www.irs.gov/credits-deductions/individuals/deducting-work-related-educational-expenses
