S.4160

Prohibits certain credit and debit card interchange fees.

Prohibits payment card networks from implementing an interchange fee when the fee includes a percentage multiplied by the gross dollar amount of a debit or credit card transaction, or does not exclude any attributable tax or gratuity from the gross dollar amount. Prohibits payment card networks from increasing the rate of an interchange fee or other similar fee that applies to the portion of an electronic payment transaction other than the portion attributable to a tax or gratuity.