Since you are not an employee, your only alternative is on Schedule C as non-employee compensation. You will have to pay Social Security and Medicare taxes on any profit.
Effective for tax years beginning after December 31, 2019, the new rules state that an amount includible in income and paid to them to aid the individual in the pursuit of graduate or postdoctoral study (such as fellowship, stipend, or similar amount) is treated as compensation for purposes of IRA contributions. Therefore, non-tuition fellowship and stipend income when included in taxable income now counts as compensation in order to make an IRA (both traditional and Roth) contribution. This allows those graduate and post-doctoral students to save more for their retirement than in the past.
SECURE ACT
