The Unified Payments Interface (UPI) and Merchant Discount Rate (MDR): A Study Guide

This study guide provides a comprehensive overview of the legal, economic, and operational framework of the Unified Payments Interface (UPI) in India, with a specific focus on the evolving regulations surrounding Merchant Discount Rates (MDR) and Prepaid Payment Instruments (PPI).

Part 1: Review Quiz

Instructions: Answer the following questions in 2–3 sentences based on the provided source context.

1. What is the fundamental definition of UPI as a payment rail?

2. What does the "UPI-Law" explicitly prohibit regarding transaction charges?

3. Explain the significance of the NPCI Circular dated March 24, 2023, regarding PPIs.

4. How is a "small merchant" defined in the context of digital payment turnover?

5. Describe the "passive smoking" analogy used to criticize PPI-based UPI charges.

6. What are the standard and special transaction limits for UPI as of 2026?

7. What is the purpose and transaction limit of "UPI Lite"?

8. Under what circumstances does Google Pay impose a convenience fee, and what is excluded?

9. What is the "Additional Factor Authentication (AFA)" waiver, and how does it vary by category?

10. According to Finance Minister Nirmala Sitharaman in 2026, what is the future of MDR on UPI?

Part 2: Answer Key

1. Fundamental Definition: UPI is a payment rail designed for the real-time transfer of funds from one account to another. It facilitates account-to-account transfers where money from the sender’s account is remitted to the receiver’s account instantly.

2. The UPI-Law: According to Section 10A of the Payment and Settlement Systems (PSS) Act, 2007, no bank or system provider operating UPI may impose any charge, directly or indirectly, on a person making or receiving a payment. This mandate ensures that UPI remains a free "prescribed electronic mode" of payment for both consumers and merchants.

3. NPCI Circular (March 24, 2023): This circular introduced interchange rates of up to 1.1% for using prepaid payment instruments (PPI), such as wallets, to make merchant payments via UPI. This established interoperability, allowing a wallet from one provider (e.g., PhonePe) to pay a merchant via another provider's QR code (e.g., Paytm).

4. Small Merchant Definition: A small merchant is characterized by the RBI as having an annual turnover of no more than Rs 20 lakh. This is equivalent to an average daily sale of approximately Rs 5,480 to Rs 5,500.

5. Passive Smoking Analogy: The analogy equates normal UPI users to "passive smokers" who suffer from the "pollution" of higher prices. Because merchants often bake the cost of PPI-based MDR into their overall business overheads, users who pay via free "plain vanilla" UPI effectively cross-subsidize the costs generated by PPI wallet users.

6. Transaction Limits (2026): Regular person-to-person (P2P) transfers are generally limited to Rs 1,00,000 per transaction. However, higher limits apply to specific categories: Rs 2,00,000 for insurance and mutual funds, and up to Rs 5,00,000 for IPO applications and government securities.

7. UPI Lite: UPI Lite is designed for small, rapid transactions and allows a wallet balance of up to Rs 5,000. Individual payments are capped at Rs 1,000, and the total daily usage cannot exceed Rs 10,000; these transactions do not require a PIN or OTP.

8. Google Pay Convenience Fees: Google Pay charges a convenience fee (0.5% to 1% plus GST) specifically for utility bill payments—such as electricity and gas—made using credit or debit cards. Crucially, UPI transactions linked directly to bank accounts remain free of these platform fees.

9. AFA Waiver: The AFA waiver removes the requirement for a PIN or OTP for smaller transactions to speed up the checkout process. While the default merchant waiver limit is Rs 15,000, it is increased to Rs 1,00,000 for recurring payments like mutual fund SIPs, insurance premiums, and credit card bills.

10. Future of MDR (2026 Update): The government has clarified that any future MDR framework will only target a limited category of merchant transactions above a high threshold. Small merchants (e.g., street vendors, auto drivers) and ordinary consumers will continue to use UPI without transaction charges.

Part 3: Essay Questions

Instructions: Use the following prompts to develop in-depth arguments regarding the economics and legality of digital payments in India. (No answers provided).

1. The Conflict of Interoperability: Analyze the tension between the technological goal of PPI-UPI interoperability and the legal mandate of zero charges under the PSS Act. Does charging for wallet-based UPI transactions violate the spirit of "prescribed electronic modes"?

2. The Economics of Cross-Subsidization: Evaluate the argument that the absence of a surcharge for high-cost payment instruments leads to an overall increase in retail prices. Should merchants be allowed to pass on MDR costs only to those users who choose more expensive payment methods?

3. Sustainability vs. Accessibility: Discuss the Finance Ministry's view that a "sustainable revenue stream" is necessary for UPI innovation. How can the government balance the need for fintech firms to generate revenue with the objective of maintaining "Har Payment Digital"?

4. UPI as a Public Good: Compare the government's responsibility for funding the physical currency system (printing and management) with its responsibility for funding the UPI ecosystem. Should the RBI provision for UPI costs in the same way it manages cash?

5. The Impact of Threshold-Based MDR: Assess the potential consequences of introducing MDR only for "large merchants" and "high-value transactions." How might this affect the adoption of digital payments among large retailers compared to small vendors?

Part 4: Glossary of Key Terms