Stipend: A predefined payment to participants for their time, effort, and inconvenience associated with trial participation. Federal tax law requires participants to report a payments of $2,000 or more per calendar year to the IRS and provide Social Security Number and Individual Taxpayer Identification Number to study team.
Reimbursement: Repayment for actual, documented expenses incurred during study participation. Clear limitations and allowable categories must be defined in the agreement, informed consent document, and study budget. Backup requirements, such as receipts, should also be explicitly mentioned.