UPI Zero MDR Policy Explained: Who Pays for Free Digital Payments

Context

India's Unified Payments Interface has democratised retail transactions across the subcontinent, but the underlying Zero-MDR mandate has turned digital payments into a policy trade-off between universal public access and the commercial sustainability of banking intermediaries. While consumers enjoy zero transaction costs, the statutory ban on merchant fees has deprived payment aggregators and acquiring banks of direct revenue. This dynamic has forced payment companies into auxiliary monetization channels like unsecured digital lending, hardware subscription rentals, and government budgetary reimbursements. Evaluating this payment model requires examining statutory provisions, market structures, and the economic balance necessary to sustain critical digital public infrastructure.

Merchant fee structures across India's digital payments architecture face recurring scrutiny as the Union Government balances digital adoption with fintech commercial viability. As of March 2024, the structural absence of organic merchant transaction fees continues to spark debates across financial and regulatory institutions regarding the long-term health of banking infrastructure.

The legal anchor of this regime rests on Section 10A of the Payment and Settlement Systems Act, 2007, which was inserted via the Finance (No. 2) Act, 2019. Under this provision, banks and system providers are prohibited from levying any charge or Merchant Discount Rate (MDR) on payers or merchants using prescribed electronic modes.

To operationalise this framework, the Central Board of Direct Taxes issued CBDT Notification No. 105/2019 under Section 269SU of the Income-tax Act, 1961, formally mandating a zero-MDR regime starting January 1, 2020, for RuPay debit cards, BHIM-UPI QR codes, and BHIM-UPI.

The National Payments Corporation of India operates as the foundational utility architect for retail settlement across the Indian economy. Incorporated in December 2008, NPCI was established as a not-for-profit company under Section 25 of the Companies Act, 1956 (now Section 8 of the Companies Act, 2013) as a joint initiative of the Reserve Bank of India and the Indian Banks' Association.

Statutory authority to operate retail payment rails—including Unified Payments Interface (UPI), Immediate Payment Service (IMPS), RuPay, and the National Automated Clearing House (NACH)—is granted by the Reserve Bank of India under Section 4 of the Payment and Settlement Systems Act, 2007.

A standard UPI transaction relies on a four-party structural workflow that moves funds instantly between disparate core banking systems:

1. Payer and Payer PSP (Payment Service Provider): The end-user initiates an authentication request via a Third-Party Application Provider (TPAP) or bank application, prompting the Payer PSP to route debits to the remitter bank.
2. Remitter Bank: The issuing bank verifies the user's secure credentials, executes an internal ledger debit, and transmits an encrypted payment message to the central switch.
3. NPCI Central Switch: The system operates as the central routing hub, validating routing metadata, securing settlement records, and directing instructions to the beneficiary's institution.
4. Beneficiary Bank and Payee PSP: The acquiring institution receives transaction instructions, credits the recipient's bank account, and sends an automated cryptographic confirmation back through the payment network.

Merchant Discount Rate represents the processing fee charged to a commercial merchant for accepting payments via electronic clearing channels. According to the Reserve Bank of India, MDR compensates acquiring banks, network switches, and payment facilitators for terminal deployment, switch maintenance, risk management, and clearing infrastructure.

In standard global electronic transactions, MDR is split across three distinct operational segments:

• Interchange Fee: The largest share of MDR, paid by the merchant's acquiring bank directly to the card- or account-issuing bank to offset account servicing, credit risk, and customer maintenance costs.
• Acquirer Processing Margin: The operational fee retained by the merchant's acquiring bank and payment aggregators for onboarding merchants, providing point-of-sale hardware, and managing settlements.
• Network Switching Fee: A minor fee paid to the transaction switch (such as NPCI, Visa, or Mastercard) for routing, cryptographic validation, and ledger settlement.

Prior to the zero-MDR policy, the Reserve Bank of India rationalised debit card fees on December 6, 2017, establishing tiered fee caps: small merchants with turnover up to ₹20 lakh were charged a maximum MDR of 0.40% capped at ₹200 per transaction, while standard merchants paid up to 0.90% capped at ₹1,000 per transaction.

To introduce targeted financial sustainability into payment routing without burdening retail users, NPCI updated its fee framework for Prepaid Payment Instruments (PPIs). Effective April 1, 2023, NPCI introduced an interchange fee ranging from 0.5% to 1.1% on Person-to-Merchant (P2M) transactions above ₹2,000 executed via interoperable PPI wallets across UPI rails.

The operational mechanics of this PPI interchange rule operate across specific technical boundaries:

• P2M Wallet Transactions Exceeding ₹2,000: When a consumer uses a prepaid wallet (e.g., a digital wallet app) to scan a merchant's standard UPI QR code for a transaction above ₹2,000, the merchant's acquiring bank pays an interchange fee to the wallet provider.
• Wallet-Loading Service Charge: PPI issuers must remit a 15-basis-point (0.15%) loading charge to the remitter bank when customers load wallet balances exceeding ₹2,000 via account transfers.
• Total Consumer Exemption: Normal consumers pay zero fees when making retail payments from wallets or bank accounts.
• Complete Exemption for Account-to-Account UPI: Peer-to-Peer (P2P) transfers and standard bank-account-to-bank-account Person-to-Merchant (P2M) transactions remain completely exempt from MDR and interchange charges.

The statutory abolition of merchant fees has generated structural tensions across India's digital economy. The framework functions as an institutional debate between treating digital rails as a utility versus maintaining the commercial solvency of market intermediaries.

The Economic Rationale for Free Payments (Digital Public Good)

Framed under the G20 India Digital Public Infrastructure architecture, digital payments operate as a Digital Public Good (DPG) exhibiting high upfront fixed development costs, near-zero marginal cost per additional transaction, and universal access.

Advocates argue that maintaining zero MDR creates distinct public-welfare advantages:

• Elimination of Cash-Handling Externalities: Moving retail volume to traceable digital ledgers reduces cash-printing expenses, suppresses informal black-money velocity, and lowers physical currency transit risks.
• Rapid Bottom-of-the-Pyramid Onboarding: Removing acceptance fees enables small street vendors and micro-enterprises to adopt QR-code payments without denting narrow trade margins.
• Expanded Formalisation and Direct Tax Visibility: Digital audit trails generate transaction records, broadening the direct tax base under Section 269SU of the Income-tax Act, 1961.

The Structural Risks to Intermediaries and Financial Stability

Conversely, the absence of commercial transaction revenue creates vulnerabilities across the domestic payment architecture. According to the Reserve Bank of India's 2022 Discussion Paper on Charges in Payment Systems, suppressing direct fee recovery poses operational risks:

• Infrastructure Under-Investment: Deprived of organic transaction revenues, acquiring banks face margin pressure, risking under-investment in server capacity, cybersecurity defences, and dispute resolution systems.

• Distorted Monetization Models: Third-Party Application Providers face asymmetric unit economics, driving them to cross-sell retail credit, merchant working capital loans, insurance, and investment products using customer digital footprint data.

• Alternative Hardware Levies: To secure cash flow, fintech aggregators have deployed subscription-based monthly rental fees on audio payment confirmation boxes ("Soundboxes") and point-of-sale hardware.

• Fiscal Dependency on State Subsidies: Between FY 2021-22 and FY 2024-25, the Ministry of Finance allocated approximately ₹8,730 crore in budgetary financial incentives to reimburse acquiring and issuing banks for processing zero-MDR UPI and RuPay transactions.

• Market Concentration Risks: Market share concentration has grown on UPI rails. In response, NPCI proposed a 30% volume market-share cap on individual TPAP applications, extending the compliance deadline to December 31, 2024.

Cross-border central banking frameworks approach retail electronic interchange by enforcing statutory fee caps rather than absolute bans. This approach balances payment system security with consumer cost protection.

Resolving India's digital payment trilemma—balancing financial inclusion, commercial viability, and systemic risk mitigation—requires calibrated policy reforms.

• Graduated, Tiered MDR for High-Turnover Merchants: Policy makers could introduce a low, tiered MDR structure on large commercial enterprises while preserving absolute zero-MDR protection for small and micro-merchants, mirroring the Reserve Bank of India's 2017 debit card tiered framework.
• Dedicated Digital Infrastructure Resilience Fund: Transitioning from discretionary annual MeitY budget allocations to a statutory development fund financed by minor interchange levies on corporate transactions would guarantee funding for cybersecurity and core banking switch upgrades.
• Enforcing Market Share Diversification: Implementing NPCI's 30% TPAP volume cap will reduce systemic single-point-of-failure risks and encourage public and private sector banks to invest in native UPI applications.
• Strengthening Algorithmic Consumer Protections: As payment intermediaries monetize non-fee payment workflows through retail lending and financial distribution, the Reserve Bank of India must maintain regulatory oversight on digital lending apps to protect consumer data privacy.

• Statutory Foundation: Section 10A of the Payment and Settlement Systems Act, 2007, inserted via the Finance (No. 2) Act, 2019, prohibits banks and system providers from levying MDR on prescribed digital payment modes.
• Corporate Structure: NPCI operates retail systems under Section 4 of the PSS Act, 2007, and is incorporated as a not-for-profit entity under Section 8 of the Companies Act, 2013.
• PPI Interchange Scope: Effective April 1, 2023, an interchange fee of 0.5% to 1.1% applies to merchant (P2M) UPI transactions above ₹2,000 made via Prepaid Payment Instruments (wallets), while standard bank-to-bank UPI remains free.
• Fiscal Compensations: To offset the zero-MDR policy, the Ministry of Finance allocated approximately ₹8,730 crore between FY 2021-22 and FY 2024-25 to support acquiring and issuing banks.
• Global Precedents: Unlike India's statutory ban, the European Union (Regulation 2015/751) and the United States (Durbin Amendment) regulate digital payment margins via interchange caps rather than complete fee prohibitions.