(a) In general. The amount of any interchange transaction fee that
an issuer may receive or charge with respect to an electronic debit
transaction shall be reasonable and proportional to the cost incurred
by the issuer with respect to the electronic debit transaction.
(b) Determination of reasonable
and proportional fees. An issuer complies with the requirements
of paragraph (a) of this section only if each interchange transaction
fee received or charged by the issuer for an electronic
debit transaction is no more than the sum of—
(1) 21 cents and;
(2) 5 basis points multiplied by the value
of the transaction.
