Every time a customer swipes a credit or debit card at your shop, you pay a merchant discount rate (MDR) to the card network and acquiring bank. For small merchants, that rate typically ranges from 1.5% to 2% of the transaction value. On a ₹1,000 purchase, you’re paying ₹15-20 just to accept the payment.

UPI transactions, by contrast, have zero MDR for merchants. The government subsidises the infrastructure cost as part of the Digital India initiative, and payment service providers (PSPs) like PhonePe, Google Pay, and Paytm don’t charge merchants for receiving UPI payments. The cost difference is stark, and it’s having real consequences for how merchants choose to accept payments.

The Economics for Small Merchants

For a small retailer with thin margins — a kirana store, a restaurant, a local clothing shop — 1.5-2% per transaction is significant. A shop with ₹5 lakh in monthly card sales pays ₹7,500-10,000 in MDR fees. That’s rent money. That’s an employee’s salary.

The same shop accepting ₹5 lakh in UPI payments pays nothing. Zero. The incentive structure is obvious.

This is why you see “UPI only” or “cards = 2% surcharge” signs in thousands of small shops across India. Merchants are rational actors responding to pricing signals. When one payment method costs 1.5% and another costs zero, the choice is clear.

Why Card Networks Argue MDR Is Justified

To be fair, card networks aren’t just collecting fees for nothing. MDR covers several costs:

Fraud protection and chargebacks. Card networks provide dispute resolution, fraud monitoring, and chargeback mechanisms that protect both merchants and consumers. If a customer claims they didn’t authorise a transaction, the card network investigates and may reverse the charge. This costs money.

Rewards programs. Credit card cashback and reward points are funded partly through MDR. Merchants subsidise the rewards that cardholders receive. This creates a transfer from merchants to customers.

Infrastructure and security. Payment gateway technology, PCI-DSS compliance, tokenisation, and network maintenance all require investment. Card networks argue that MDR funds the security infrastructure that makes card payments safe.

Credit underwriting for credit cards. When someone uses a credit card, the issuing bank is extending short-term credit. The risk and cost of that credit are partly covered by MDR and interest charges.

These arguments have validity for credit cards. For debit cards — which don’t involve credit risk or expensive rewards programs — the MDR justification is weaker. And it doesn’t change the fact that merchants still prefer to avoid the cost when UPI is available.

Consumer Impact: Card Surcharges

RBI regulations technically prohibit merchants from charging extra for card payments. The RBI’s Payment and Settlement Systems Regulations state that merchants cannot levy charges for digital payments.

In practice, many merchants ignore this rule. You’ll find restaurants adding “2% credit card charge” to the bill, petrol pumps offering discounts for cash or UPI, and shops that simply refuse card payments under a certain amount. Enforcement is inconsistent, and merchants calculate that the risk of penalty is lower than the cost of paying MDR.

The practical result is that consumers are subtly pushed toward UPI. Which, from a digital payments adoption perspective, is arguably what the government wants. But it does create a two-tier system where card-based rewards programs become less attractive because it’s harder to actually use cards without penalties.

Premium Merchants and Cards

High-end retailers, hotels, and restaurants still accept cards without surcharges because their customer base expects it. Credit card users in India tend to be higher-income consumers who are less price-sensitive and more likely to value rewards programs. For premium merchants, accepting cards is part of the service offering.

But even in this segment, UPI adoption is growing. I was at a boutique hotel in Goa last month that prominently displayed UPI QR codes at checkout alongside the card terminal. Both options available, but the UPI option was clearly preferred.

Credit Card Growth vs UPI Dominance

Despite UPI’s cost advantage, credit cards are still growing in India. NPCI data shows UPI transactions reached 12.5 billion in February 2026, up from 11.4 billion in February 2025. But credit card spending is also growing — the RBI reports credit card transaction value increased 18% year-on-year in the same period.

The growth isn’t contradictory. Different use cases favour different payment methods:

• Small transactions, local merchants: UPI dominates
• Online shopping, large purchases: Cards and UPI are both used, depending on rewards and offers
• Merchants who want to avoid transaction fees: UPI only
• International payments, travel bookings: Cards remain essential

Credit cards also provide a line of credit, which UPI doesn’t. For households managing cash flow, credit cards enable purchases today with payment 30-45 days later. That feature alone sustains card usage despite MDR disadvantages for merchants.

What Might Change

If card networks reduced MDR significantly — say, to 0.5% or even zero for debit cards — the merchant preference for UPI would diminish. But that would require either card networks accepting lower profits or the government subsidising card infrastructure the way it subsidises UPI.

Neither seems imminent. Card networks are for-profit entities answerable to shareholders. UPI infrastructure is government-backed with explicit policy goals around financial inclusion and digital payment adoption. The structural cost difference is likely to persist.

There’s also discussion around introducing charges for UPI transactions beyond a certain volume or value threshold to recover some infrastructure costs. If that happens — and it’s been discussed at RBI policy forums — the cost gap between UPI and cards would narrow. But as of March 2026, UPI remains free for merchants and consumers, and any attempt to introduce charges would face significant political resistance.

The Bottom Line

For merchants, UPI’s zero cost makes it the rational choice for payment acceptance. For consumers, UPI works seamlessly for most transactions, though credit cards retain advantages for credit access and rewards. The result is a payments landscape where UPI handles the volume and cards handle specific use cases where credit or rewards justify the cost.

Card networks will need to find value propositions beyond simply processing transactions if they want to remain relevant in a market where a free alternative exists. Enhanced fraud protection, better rewards structures, or integration with credit products might differentiate cards enough to justify MDR. But for everyday retail transactions at small merchants, UPI’s economics are hard to beat.