Merchant discount rate, or MDR, is the fee a merchant pays to accept electronic payments, especially card payments.
MDR is usually calculated as a percentage of the transaction amount. It may also include a fixed fee per transaction, depending on the pricing model agreed with the acquirer, payment processor, PSP, or payment facilitator.
In simple terms, MDR is the cost a merchant pays for payment acceptance.
When a customer makes a payment, several parties may be involved in processing the transaction, including the issuer, acquirer, card network, payment processor, PSP, or payment gateway.
The merchant does not usually receive the full transaction amount. Payment fees are deducted before funds are settled to the merchant, or charged separately according to the provider's billing model.
For example, if a merchant accepts a card payment, the MDR may cover several cost components, such as interchange fees, scheme fees, acquiring fees, processor fees, and provider margins.
MDR can include different payment cost components depending on the payment method and provider setup.
Common components include:
The exact structure may vary by country, card type, payment method, transaction channel, merchant category, and provider contract.
MDR and interchange fee are related, but they are not the same. Interchange fee is one component of card payment cost. It is usually paid to the issuing bank involved in the transaction.
Merchant discount rate is the broader fee charged to the merchant for accepting the payment. It may include interchange fees, scheme fees, acquiring fees, processing fees, and provider markup. In simple terms, interchange is one part of the cost. MDR is the total merchant-facing rate.
MDR is often expressed as a percentage of the transaction amount, while a transaction fee can be a fixed amount, a percentage, or a combination of both. For example, a merchant may pay 2.5% MDR, a fixed fee per transaction, or a blended pricing model such as a percentage plus a fixed amount.
In everyday payment discussions, MDR and transaction fee are sometimes used loosely, but MDR usually refers to the merchant's overall payment acceptance rate.
MDR matters because payment costs directly affect merchant margins. A small difference in payment fees can become significant at scale, especially for businesses with high transaction volumes, low-margin products, cross-border payments, or multiple payment methods.
For merchants, understanding MDR helps with pricing, profitability analysis, provider comparison, and cost optimization. For PSPs and payment businesses, MDR affects commercial strategy, merchant pricing, provider relationships, and revenue models.
MDR can vary based on several factors, including:
High-risk industries, international transactions, premium cards, and low-volume merchants may face higher MDR than lower-risk or higher-volume businesses.
MDR is usually monitored together with settlement reports, provider fees, transaction volumes, refunds, chargebacks, and reconciliation data. For businesses working with several PSPs, acquirers, markets, currencies, and payment methods, the effective cost of payment acceptance can vary across providers and routes. Payment teams need clear data to understand where costs come from and how they affect margins.
A central payment infrastructure layer can help businesses compare payment costs across providers, monitor fees, and reconcile settlement data more clearly. Corefy supports this by centralizing payment data across multiple providers, routes, currencies, and methods, helping teams analyze payment costs alongside transaction performance.
