MDR (Merchant Discount Rate)
Total percentage fee merchant pays for payment processing. Includes interchange, scheme fees, and processor markup. High-risk: 3-8%; low-risk: 1.5-3%.
Overview
What is MDR?
The Merchant Discount Rate (MDR) is the total percentage fee merchants pay for each card transaction, representing the combined cost of interchange fees (paid to issuing banks, typically 1.5-2.5%), scheme/network fees (paid to Visa/Mastercard, typically 0.15-0.30%), and processor markup (your PSP's fee, typically 0.3-5% depending on risk). Understanding MDR breakdown helps merchants evaluate whether pricing is competitive and identify optimization opportunities.
MDR structure: For a typical transaction at 2.9% total cost, the breakdown might be: 1.8% interchange (non-negotiable, set by card networks), 0.15% scheme fees (non-negotiable, set by Visa/Mastercard), and 0.95% processor markup (negotiable, your PSP's profit). The processor markup is the only component merchants can negotiate - everything else is pass-through costs from card networks and banks.
High-risk vs. low-risk MDR variance is dramatic. Low-risk merchants (retail, restaurants, professional services) pay 1.5-3% total MDR with processor markups of 0.3-0.8%. High-risk merchants (gaming, nutra, adult, dating) pay 3-8% total MDR with processor markups of 1.5-5% because processors demand higher margins to offset elevated chargeback risk, longer reserve periods tying up processor capital, and regulatory/reputational risks of high-risk verticals.
MDR optimization strategies: (1) Negotiate processor markup based on volume and performance - merchants processing $1M+ monthly with <1% chargeback rates should push for 0.5-1% reductions in processor markup, (2) Optimize interchange qualification through AVS/CVV matching and proper transaction categorization to qualify for lower "qualified" rates vs. "non-qualified" rates 0.5-1% higher, (3) Favor debit over credit when possible (debit interchange is 0.5-1.5% lower), (4) Multi-PSP arbitrage where you route transactions to PSPs offering better rates for specific card types or geographies. For $5M annual volume, MDR optimization saves $50K-200K annually without operational changes.
In depth
Everything you need to know.
Each transaction incurs MDR as percentage of amount. $100 purchase at 3% MDR costs $3, merchant receives $97. Splits: $1.80 interchange, $0.15 network fees, $1.05 processor markup. Deducted automatically during settlement.
MDR directly impacts profit. Reducing from 4% to 3% on $10M saves $100K annually. High-risk pay 2-3X more (6% vs 2%), costing $400K extra. Negotiating processor markup from 2% to 1.5% saves $50K.
Illustrative example — not a specific client engagement.
- $8M merchant negotiated MDR from 3.8% to 3.1%, saving $56K annually
- Improved interchange qualification from 65% to 88%, reducing MDR 2.9% to 2.4%, saving $50K on $10M
- Multi-PSP routing by card type dropped blended rate 3.2% to 2.7%, saving $75K on $15M
- Negotiate based on volume: $1M+ should get 1-1.5% markup
- Request interchange-plus pricing showing exact breakdown
- Implement AVS/CVV for lowest interchange
- Monitor for downgrade fees
- Accepting first quote without negotiation
- Not understanding only processor markup is negotiable
- Comparing MDR without considering reserves
- Missing AVS/CVV costing 0.3-0.8% in downgrades
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