Separate four payment purposes
| Category | What it addresses | Question to ask |
|---|---|---|
| Reimbursement | Out-of-pocket expenses such as mileage, parking, lodging, meals, or childcare when approved | Which expenses qualify, and what proof is required? |
| Compensation | Time, effort, inconvenience, discomfort, or other contribution defined by the study | What amount accrues after each activity? |
| Appreciation | A token thank-you that may not match actual cost or time | When is it issued, and does withdrawal affect it? |
| Incentive or completion bonus | An additional amount tied to a milestone or completion | How large is it compared with accrued payment, and which milestone controls it? |
Federal advisory guidance (opens in a new tab) distinguishes these purposes because each raises different fairness and voluntariness questions. Payment can be a valid reason to consider research. Keep risk, possible benefit, alternatives, and medical suitability in their own review.
Ask how payment accrues
For FDA-regulated research, FDA payment guidance (opens in a new tab) states that payment should accrue as participation progresses and that the entire amount should not depend on completing the study. A small, reasonable completion incentive may be acceptable when the IRB reviews it.
Ask what happens after a screen failure, early discharge, missed visit, investigator removal, adverse event, protocol change, sponsor pause, or voluntary withdrawal. Request the answer in the consent materials or another approved written document.
Record when each payment is earned and paid
| Activity | Accrued amount | Expense reimbursement | Issue date | Condition |
|---|---|---|---|---|
| Screening | Record the stated amount | Parking or mileage, if approved | Record the stated timing | Ask whether screen failure changes it |
| Visit 1 | Record visit payment | Approved travel | Record timing | Ask what counts as completed |
| Diary period | Record period or entry rule | Data expense, if offered | Record timing | Ask how technical failure is reviewed |
| Final milestone | Record accrued visit payment | Approved travel | Record timing | List any separate completion incentive |
Use the actual study terms. This table is a reading method, not a standard payment structure.
Confirm timing and payment method
Ask whether payment arrives by check, direct deposit, prepaid card, electronic transfer, or another method. Record the processor, activation steps, identity or tax forms, transfer limits, inactivity or withdrawal fees, replacement process, and support number.
Translate “processed after the visit” into a date range. Ask when the site submits payment, when the processor releases it, and whom to contact after the deadline. Keep screenshots or statements that show amounts without exposing card numbers.
Prepare tax and benefits questions without guessing
Ask whether the payer expects to issue a tax form and what name appears as payer. Keep payment and expense-reimbursement records separate. Tax treatment can depend on the payment type, amount, jurisdiction, and your circumstances.
Benefits programs can use their own income and reporting rules. Ask a qualified tax professional or benefits administrator how the specific payment affects you. Do not rely on a study recruiter for individualized tax or eligibility advice.
Resolve a discrepancy with an itemized record
List the activity, date, promised amount, expected issue date, amount received, and supporting consent or schedule language. Send a concise question to the payment contact. Ask for an itemized reconciliation.
Escalate through the study coordinator, site payment office, principal investigator, or participant-rights contact according to the issue. Payment pressure that interferes with withdrawal or consent belongs in a rights conversation.
Sources for this guide
References for the definitions, rules, and findings discussed above. The dates below record source checks; they are separate from the article’s edit date.
- U.S. Food and Drug Administration. Payment and Reimbursement to Research Subjects (opens in a new tab). Checked September 5, 2026.
- Secretary’s Advisory Committee on Human Research Protections (SACHRP), HHS. Addressing Ethical Concerns: Offers of Payment to Research Participants (opens in a new tab). Checked September 5, 2026.
- National Institutes of Health IRB Office. Compensation for Research Participation (opens in a new tab). Checked September 5, 2026.
- Office for Human Research Protections. Informed Consent FAQs (opens in a new tab). Checked September 5, 2026.
- Office for Human Research Protections. Questions to Ask About Volunteering for a Research Study (opens in a new tab). Checked September 5, 2026.