Did you receive any tax forms (F 1099MISC) from IBS or CNS?
Was the payment to reimburse you for your travel and other related expenses? Most of the time the payment is considered reimbursement rather than payment for services and not taxable. However if you received Form 1099MISC you would need to report the amount as income and then deduct your expenses related to the income on Schedule C.
If you did receive a Form 1099MISC I would discuss with a tax expert regarding other tax (SE Tax) issues You would receive F 1099MISC if your total payment was more than $600
