Card Brand Assessments: Reading the Network Fee Lines

Three layers in one bill

Visa's Core Rules (18 April 2026 edition) define the merchant discount rate for the US region as the percentage a merchant pays its acquirer for transacting on a credit card brand, and say it includes the interchange rate, network set fees associated with processing a transaction, network set fees associated with acceptance of the network's brand, and acquirer set processing fees. That definition gives you three layers: interchange, network fees (what statements often call assessments or brand fees) and the acquirer's or processor's own fees. The same definition says fees invoiced separately, such as terminal rental, are excluded from the merchant discount rate.

Interchange is not an assessment

Visa's US interchange schedule, dated 18 April 2026, says Visa uses interchange reimbursement fees as transfer fees between financial institutions, and that merchants do not pay interchange directly: they pay a merchant discount to their financial institution, which may bundle a variety of processing services. On an interchange-plus statement you will usually see interchange and network fees passed through, then a separate markup. On tiered or flat pricing all three are blended, and you cannot check the network layer without an itemised report.

Why the network numbers are hard to verify

Visa publishes its interchange schedule and a public edition of its rules, but the public rules say Visa omitted proprietary and competitive information. The network fee schedules that acquirers pay are generally not part of the public documents we checked. We did not find a public Mastercard, American Express or Discover US merchant fee schedule we could load, so we do not quote any network fee rates here. If someone quotes you an exact assessment percentage, ask where it is published.

How to check your assessment lines

Ask your provider for a list of every network fee it passes through, the network each fee comes from, and whether the amount is charged at cost. Then compare three consecutive statements. Illustrative example only, with made-up round numbers: if a statement shows $20,000 of Visa sales and a Visa assessment line of $30, that line works out to 0.15%. If next month the same kind of sales shows $40 on the same line, ask what changed: a network notice, a new fee name, or a change in how the provider bills it. A fee line with a network-sounding name that no network notice explains deserves a written question.

An assessment on your statement is not a non-compliance assessment

The word assessment does two jobs in card-network language, and confusing them wastes a phone call. On a merchant statement, an assessment line is the per-transaction or per-dollar network fee your acquirer passes through. In Visa's Core Rules the same word names something else entirely. Section 1.11.2.1 says a member that does not comply with the Visa Charter Documents or the Visa Rules will be subject to non-compliance assessments, that depending on the violation a non-compliance assessment may be levied per merchant, merchant outlet, transaction, device or card as defined by the impacted rule, and that Visa may assess, suspend or waive them in whole or in part to accommodate unique or extenuating circumstances. The rules also say Visa may, at its sole discretion, deviate from its published schedules, considering the type of violation, the nature of the damage including the amount incurred by Visa or its members, and whether the violation is repetitive. Two things follow for a merchant. First, a non-compliance assessment is a penalty aimed at a member — the acquiring bank — for a rule breach, not a routine cost of accepting cards, so it should not appear as a standing monthly line on your statement. Second, if one is passed down to you, it is attached to a specific rule and a specific event, and you are entitled to ask which rule, which transactions and which date. A charge described only as a network assessment, with no rule reference and no event behind it, is a pricing line your provider chose, and pricing lines are negotiable.

The fee lands on the acquirer before it lands on you

Network fees are billed to members, not to merchants. Visa's rule on acquirer payments to card acceptors (Section 1.5.6.2) says an acquirer must pay or credit its merchant's account promptly after transaction deposit, and that those payments must equal the transaction totals less credit transactions, applicable discounts, disputes, other agreed fees and merchant reserve funds where applicable. A network fee reaches you inside those discounts or inside other agreed fees — that is, through your contract, not through an invoice the network addresses to you. Two consequences follow. Your provider decides whether to pass a network fee through at cost, mark it up, or bury it in a blended rate, and nothing in the public rules forces one of those choices. And when a network fee changes, whether your bill changes depends on the change-notice terms in your agreement rather than on the network notice itself. Visa's rules do set a correction window for its own side of this: Section 1.11.1.1 says that if Visa confirms a member has underpaid or overpaid its fees it may process a fee adjustment, limited to the two years before the overpayment or underpayment was reported to Visa or before Visa discovered the adjustment was due, that Visa reserves the right to collect an underpayment beyond that two-year period, and that any collection or refund does not include interest. That is a member-to-Visa rule rather than a merchant-to-provider one, but it is a fair benchmark to name when you ask a provider to correct a billing error going back more than a month.

Debit is different

For debit cards issued by large banks, the Federal Reserve's Regulation II sets standards for the interchange fee the issuer may receive and allows a fraud-prevention adjustment; certain small issuers and some prepaid programs are exempt. The Federal Reserve's page also lists a proposal to lower the maximum interchange fee, so check the current rule before relying on any figure. Regulation II is about interchange and routing; it does not set the fees your processor charges you.