Merchant Discount Rate
What is merchant discount rate?
Merchant discount rate (MDR), also called the transaction discount rate (TDR), is the fee a merchant pays its to accept a debit or credit card payment. It's quoted as a percentage of each transaction's value, sometimes with a small fixed per-transaction fee added on top.
The MDR is not a single charge. It bundles three cost layers that flow to three different parties: paid to the cardholder's issuing bank, assessment fees charged by the such as Visa or Mastercard, and the acquirer's own markup for handling the transaction.
Key facts
- The merchant discount rate is also known as the transaction discount rate (TDR).
- It is expressed as a percentage of transaction value, occasionally with a flat per-transaction fee.
- It combines three costs: interchange, card network assessments, and the acquirer's markup.
- Interchange is the largest layer and is fixed by the card network; the acquirer's markup is where pricing competition happens.
- The rate changes with card type, transaction channel, , dispute history, and processing volume.
How the merchant discount rate is calculated
The MDR is the sum of three stacked components, each paid to a different participant in the payment.
- Interchange. Set by the card network and paid to the cardholder's issuing bank. It is the largest portion of the rate and varies by card type, region, merchant category, and whether the transaction is card-present or card-not-present.
- Assessment (scheme) fees. Charged by the card network itself for use of its rails. These are smaller than interchange and apply across all merchants on that network.
- Acquirer markup. The acquirer's margin for authorizing, clearing, and settling the payment. This is the layer a merchant can negotiate.
Interchange and assessment fees are pass-through costs the acquirer collects on behalf of the issuing bank and the network. The markup is the only component the acquirer keeps.
What affects the merchant discount rate
- Transaction channel. A usually carries a lower rate than a , because remote payments carry more fraud risk.
- Card type. Premium rewards cards and commercial cards carry higher interchange than standard debit cards.
- Merchant category code. The MCC signals the business type and its risk profile, which maps to different interchange tiers.
- Dispute history. A chargeback rate that approaches the network's marks the merchant as higher risk and pushes the rate up.
- Volume and tenure. Higher processing volume and a longer track record with the acquirer give a merchant more leverage to negotiate a lower markup.
How merchants lower the merchant discount rate
Two pricing models shape how much room a merchant has to reduce its MDR. Flat-rate (blended) pricing rolls every cost into one percentage, which is simple to read but hides the markup inside the headline number. Interchange-plus pricing lists the pass-through interchange and assessment fees separately from the acquirer's margin, so the negotiable portion is visible.
Because interchange is fixed by the card network, the markup is the part open to negotiation. Merchants that process higher volumes, keep dispute rates well below the network thresholds, and route transactions so they qualify for lower interchange tiers end up with a lower effective rate.
