What is Merchant Discount Rate?

What Is the Merchant Discount Rate?

The Merchant Discount Rate, often abbreviated to MDR, is the fee that a merchant pays to their payment processor or acquiring bank for every card transaction. When a customer pays with a card and the transaction is approved, the merchant does not receive the full amount. A percentage is deducted before the funds hit the merchant's account, and that percentage is the MDR.

For example, if a customer pays 100 pounds with their debit card and the MDR is 1.5%, the merchant receives 98.50 pounds. The 1.50 pounds covers the costs of processing the transaction, and it is shared between several parties in the payment chain.

What the MDR Covers

The MDR is not a single fee going to a single company. It is a bundled rate that covers three main cost components:

Interchange Fee

This is the largest component, typically accounting for 70-80% of the total MDR. The interchange fee is set by the card networks (Visa, Mastercard) and paid by the merchant's acquiring bank to the cardholder's issuing bank. It compensates the issuing bank for the risk of lending funds to the cardholder and for the costs of maintaining the card programme.

Interchange rates vary depending on the type of card (debit, credit, corporate, rewards), the type of transaction (in-person, online, phone), and the merchant's industry. In the UK and EU, interchange fees are capped by regulation: 0.2% for consumer debit cards and 0.3% for consumer credit cards. Corporate cards are not subject to these caps.

Card Scheme Fee

Visa and Mastercard charge a fee for use of their network. This covers the infrastructure that routes transactions between banks, the brand and security programmes, and the dispute resolution systems. Scheme fees are generally smaller than interchange but can vary based on transaction volume and type.

Acquirer Margin

This is the acquiring bank's or payment processor's markup for providing the merchant account, the card terminal or payment gateway, reporting, settlement, and customer support. This is the most negotiable component of the MDR.

Pricing Models

There are different ways that payment processors present the MDR to merchants:

• Blended pricing combines all three components into a single flat percentage. Simple to understand, but makes it difficult to see what you are actually paying for
• Interchange plus pricing passes through the actual interchange and scheme fees and adds a fixed markup. More transparent and often cheaper for higher-volume businesses
• Tiered pricing groups transactions into categories (qualified, mid-qualified, non-qualified) with different rates. This model is widely criticised for its lack of transparency

Why the MDR Matters for Businesses

The MDR directly affects profitability. For a business processing a million pounds in card payments per year, the difference between an MDR of 1.2% and 1.8% is 6,000 pounds. For high-volume merchants, this adds up to substantial sums.

Understanding your MDR is also important for pricing decisions. If you sell low-margin products or services, the payment processing fee becomes a significant cost that needs to be factored into your pricing strategy. Some businesses add a surcharge for card payments to recover the MDR, although this is subject to regulations and card network rules.

Negotiating a better MDR requires understanding the components. The interchange fee is fixed, so you cannot negotiate it. The scheme fee is also largely fixed. But the acquirer margin is negotiable, and businesses with higher transaction volumes, lower chargeback rates, or lower average transaction risk are in a stronger position to negotiate.

MDR in Telephone and Phone Payments

Telephone payments are classified as card-not-present transactions, which generally attract higher interchange rates than face-to-face payments. This is because the card networks consider CNP transactions higher risk since the card is not physically present for verification.

The MDR for phone payments may therefore be higher than what the same merchant pays for in-store transactions. This is worth bearing in mind when calculating the cost of operating a contact centre payment channel. However, the security measures used, such as DTMF suppression and tokenisation, can help reduce chargeback rates, which may in turn help in negotiating a lower acquirer margin.

Some payment processors also offer different MDR structures for different channels, so it is worth asking whether your phone payment transactions can be priced separately from your online transactions.

Practical Considerations

• Review your MDR regularly. Payment processors often adjust rates, and competitive offers change. An annual review can save significant money
• Ask for interchange plus pricing if you process more than a few thousand pounds per month. The transparency is worth it
• Watch for hidden fees beyond the MDR, such as PCI non-compliance fees, minimum monthly charges, or gateway fees
• Corporate and international cards attract higher interchange rates than domestic consumer cards. If you have many of these transactions, they will increase your effective MDR
• Chargebacks increase costs. High chargeback rates can lead to higher MDRs or even account termination by the processor

The MDR is one of those costs that many businesses accept without question, but understanding it and actively managing it can have a real impact on your bottom line.