Merchant Discount Rate
What Is the Merchant Discount Rate? Definition and How It Works
Definition
The Merchant Discount Rate (MDR) is the total percentage fee a merchant pays to its acquiring bank on each card transaction, comprising interchange paid to the issuing bank, scheme fees paid to the card network, and the acquirer's own processing margin.
How it works
MDR is the all-in cost of accepting a card payment, expressed as a percentage of the transaction amount. When a merchant receives $100 from a customer paying by card, the merchant receives less than $100 after MDR: a 2% MDR on a $100 transaction means the merchant nets $98.
The three components of MDR are: interchange (the largest component, set by card networks and paid to the issuer), scheme fees (set by card networks, paid to the network), and acquirer margin (the acquirer's commercial pricing above the pass-through costs). Only the acquirer margin is negotiable.
MDR is quoted in two main ways. Blended pricing quotes a single flat rate that bundles all three components. This is simple to understand but hides the individual components and makes optimisation impossible. Interchange-plus pricing quotes interchange at actual cost plus a fixed acquirer margin. This transparency enables merchants to see exactly what they are paying for each transaction type and to identify cost optimisation opportunities.
Effective MDR varies across a merchant's transaction mix even under a single blended rate: a transaction on a UK debit card at an EU merchant has different cost components than a US premium credit card transaction at the same merchant. Blended pricing averages across the mix; interchange-plus exposes the variation.
Why it matters
MDR is a revenue-sharing mechanism: every card payment involves the merchant sharing a portion of the transaction value with the issuer (via interchange), the card network (via scheme fees), and the acquirer (via margin). Understanding the size and negotiability of each component is the basis for cost optimisation.
Benchmarking MDR requires interchange-plus visibility: comparing MDR across acquirers under blended pricing is difficult because blended rates include different cost structures. Interchange-plus structures make comparisons meaningful because the pass-through costs are fixed by the card networks and the only variable is the acquirer's margin.
MDR negotiation is meaningful at volume: acquirer margin is typically 10-30 basis points above interchange-plus pass-through costs. At $100M of annual card volume, a 10 basis point margin reduction is $100,000 per year. Negotiation is most impactful for merchants who can demonstrate volume, low chargeback rates, and competitive alternatives.
Card mix management can reduce effective MDR: routing debit cards through a debit-optimised acquirer, submitting Level 2/3 data for commercial card transactions, and ensuring correct MCC classification all reduce the interchange component of MDR without negotiating anything with the acquirer.
With PXP
PXP prices enterprise merchants on interchange-plus structures, passing interchange and scheme fees at actual cost with a transparent acquiring margin. MDR data by transaction type and card category is available in PXP's cost reporting, enabling merchants to identify their highest-cost transaction segments.
Frequently asked questions
What are the three components of the Merchant Discount Rate?
MDR comprises: interchange (set by card networks, paid to the issuing bank, typically 70-80% of total MDR), scheme fees (set by card networks, paid to the card network, typically 10-15% of MDR), and acquirer margin (the acquirer's commercial pricing above pass-through costs, typically 10-20% of MDR). Only the acquirer margin is negotiable; interchange and scheme fees are fixed by the card networks.
What is the difference between blended MDR and interchange-plus MDR?
Blended MDR is a single flat rate that combines interchange, scheme fees, and acquirer margin into one number. Simple to understand but opaque, it hides the actual cost components and makes optimisation difficult. Interchange-plus MDR passes interchange and scheme fees at actual cost and charges a fixed acquirer margin on top. More complex to read but fully transparent, enabling merchants to see exactly what each transaction type costs and where optimisation is possible.
How do merchants negotiate a lower MDR?
MDR negotiation focuses on the acquirer margin, which is the only component under the acquirer's control. Leverage factors include: higher transaction volume (more volume = lower per-transaction economics for the acquirer), lower chargeback rates (lower risk = lower margin requirement), competitive bids from other acquirers (credible alternative = negotiating pressure), and contract length commitments. Merchants with multiple acquirer relationships have more leverage than single-acquirer merchants.
What is a good MDR for e-commerce merchants?
There is no universal benchmark because MDR varies significantly by card mix, geography, and volume. EU merchants benefit from interchange caps under the IFR. US merchants pay higher interchange rates. As a rough guide, a US e-commerce merchant on interchange-plus with competitive acquirer margins should expect an effective MDR of 1.8-2.5% on a typical consumer credit card mix. Merchants above that range should review their interchange optimisation and acquirer margin.
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