When we buy a ₹25 golgappa, we scan a QR code, nod at the shopkeeper, and walk away, no cash, no change, no second thought. That is perhaps the biggest achievement of the Unified Payments Interface's (UPI), not just that it has digitised payments, but it also made the movement of money almost invisible. August 25^th, 2026 marked a decade of UPI. What began in 2016 as an interoperable payment platform now operates across 11 countries and has become inbuilt with everyday commerce. Yet UPI's tenth anniversary has coincided with a very different conversation in Parliament. At the centre of that debate lies the Merchant Discount Rate (MDR). In simple terms, MDR is a fee paid by a merchant to the payment ecosystem for processing a digital transaction. It is not a fee charged directly to the customer. If you pay ₹500 through UPI, ₹500 still leaves your bank account; where MDR applies, the merchant receives slightly less after the processing charge. The government has clarified that person-to-person transactions will remain free and that the vast majority of merchant transactions are also expected to remain outside any future charge. Any future MDR, if introduced, would apply only to a limited category of merchant transactions above a specified threshold and at a nominal rate lower than debit or credit card MDRs. So why touch the law at all?

The answer lies in UPI's own success. When Zero-MDR was adopted in 2020, it was never meant to be a permanent economic arrangement, rather, it was a policy instrument, designed to get every kirana store, vegetable cart, and neighbourhood pharmacy onto a QR code without worrying about transaction costs. However, Zero-MDR never meant Zero Cost.

Behind every instant payment sits an ecosystem that customers never see, banks settling transactions in seconds, payment providers maintaining servers, cybersecurity teams chasing fraud, dispute-resolution systems still working long after the customer has left the shop. None of that runs for free. For years, government subsidy absorbed part of this cost. A Parliamentary Standing Committee has estimated the UPI ecosystem's annual operating cost at around ₹20,700 crore, against a 2026-27 budget allocation of just ₹2,000 crore for RuPay and low-value UPI incentives, meaning government support currently covers barely a tenth of the industry's real costs. This raises an argument that UPI has outgrown its subsidy model. Subsidies can be effective when the goal is adoption. But UPI is no longer waiting to be adopted. It is already embedded in everyday economic life. Continuing to finance a rapidly expanding payment network primarily through public incentives raises a legitimate question of fiscal sustainability. Financial inclusion was the challenge of the first decade, financial sustainability is the challenge of the second. Asking whether large commercial merchants should contribute a nominal processing fee is therefore not necessarily an attack on UPI's success. It may instead recognise it. Free access does not mean free infrastructure.

The next concern is regarding legal certainty and delegated legislation. The Parliament amended Section 10A of the Payment and Settlement Systems Act, 2007, which had previously created a statutory barrier against charging users for specified electronic payment modes. The amendment does not itself impose MDR. Instead, it removes the earlier statutory bar and creates room for the government to determine, through future notification, which payment modes will continue to enjoy protection from such charges. Parliament has not told who counts as a large merchant, what they must pay, when, or even whether they will pay at all, it has delegated that entire question to executive discretion, with the “UPI and Services Steering Committee” headed by the NPCI expected to work out the details once the amendment takes effect. That does not automatically make the framework unlawful. Delegated legislation is a normal feature of modern economic regulation. But it does raise a question of institutional accountability.

There is a further layer that is market concentration. UPI may be public infrastructure, but its user-facing market is highly competitive. PhonePe and Google Pay together process the overwhelming majority of UPI transactions, and NPCI's proposed 30% market-share cap on any single provider has now been deferred twice, most recently to the end of 2026. If MDR eventually becomes a significant revenue stream, the question cannot simply be who pays? It must also be who benefits? Payment aggregators are already seeking a fixed and direct share of any future MDR instead of depending on banks to distribute the revenue. The conversation, therefore, is no longer simply about charging merchants, it is about allocating value within the payments ecosystem. A sustainable revenue model for UPI is sensible. A model that unintentionally strengthens already dominant payment intermediaries is considerably harder to defend.

Equally important is the position of merchants themselves. If selected merchants begin paying MDR on higher-value transactions, businesses operating on thin margins may respond in subtler ways, preferring cash for expensive purchases, introducing minimum purchase conditions, or adjusting pricing structures to absorb processing costs. The current amendment does not clarify whether merchants will be permitted to recover MDR indirectly through surcharges or other commercial practices. Protecting consumers, therefore, may require more than simply declaring that users will not be charged. It may require regulating how merchant-side costs are passed through the market.

None of this means that MDR is inherently bad policy. On balance, a carefully designed MDR regime for large merchants could actually be the more sustainable choice. Consumers should remain protected, small businesses should not bear a disproportionate burden, and the pricing mechanism should be transparent and subject to meaningful regulatory oversight. For now, the ₹25 golgappa remains exactly what it feels like, a ₹25 golgappa. But beneath that simple QR scan is a much larger policy question. India spent a decade making digital payments feel free. The next decade will determine whether it can keep them accessible without pretending that the infrastructure behind them costs nothing. The challenge before lawmakers is not choosing between free payments and sustainable payments. It is designing a legal framework in which both can coexist. The real question is whether the businesses earning millions on that same digital highway should finally help maintain the road.