The short answer
Adding a surcharge to credit-card transactions to recoup your processing fees is legal in most of the US, but only if you run a fully compliant surcharge program. The networks (Visa, Mastercard, Amex, Discover) publish the rules; the Federal government leaves it to states; and the enforcement is split between the networks (which can fine you or shut off your account) and the FTC/state AGs (which can sue you for deceptive pricing).
The five compliance pillars
- Registration. You must notify Visa and Mastercard in writing at least 30 days before your first surcharged transaction. No exceptions. Most processors register on your behalf when you enable the feature; verify they've done it.
- Disclosure signage. Clear, prominent notice at the point of entry (store door), at point of sale (checkout counter), and on receipts. Online: clear notice at checkout before the customer enters card data, and on the order confirmation.
- Receipt language. The surcharge must be a separate line item, labeled as a "surcharge," showing both the percentage and the dollar amount. It cannot be labeled as "fee," "service charge," or "convenience fee."
- Surcharge cap. Maximum is the lesser of 4% or your actual cost of accepting credit cards. If your effective credit-card rate is 2.9%, your surcharge ceiling is 2.9% — not the full 4%. Exceeding your cost is the single most common enforcement action.
- Debit carve-out. Debit cards and prepaid cards can never be surcharged, even when run as signature debit. You must be able to distinguish them at checkout (via BIN lookup) and exempt them from the surcharge automatically.
State-law landmines
Ten states have laws restricting or banning credit-card surcharges. As of 2026, surcharging is outright banned or heavily restricted in: Connecticut, Massachusetts, Maine. Court rulings have limited or voided bans in California, Colorado, Florida, Kansas, New York, Oklahoma, and Texas — but the operational safe approach is to check each state-of-customer rule before charging. Multi-state e-commerce operators typically need a BIN + billing-state lookup to exempt transactions from restricted states.
What operators need to know
- Dual pricing ≠ surcharging. "Cash discount" programs (see cash discount program) and "dual pricing" programs use different rules and are not subject to the 4% cap. Pick the model that fits your channel before you build it.
- Online compliance is harder. Disclosures must be prominent and must appear before card entry, not after. Buried "by proceeding, you agree" language fails network audits.
- Violations come with real money. Visa can fine you $5,000 per violation plus termination; Mastercard goes up to $25,000/month for repeated violations. Enforcement is usually triggered by customer complaints to the networks.
- Multi-brand operators need per-brand compliance. Each brand registers separately, must have its own signage/receipts, and must respect the state laws where its customers live. There's no portfolio-wide waiver.
When surcharging makes sense
For B2B and high-ticket transactions where customers expect to absorb processing costs, surcharging typically returns 90-95% of credit-card fees. For consumer e-commerce, customer-experience cost usually exceeds the savings and a cash discount or dual pricing model is better. See also surcharge program.