The real question is whether the cost stays confined to the merchant side or finds its way into prices. For a decade, UPI has run on one promise: instant, free and frictionless. That promise is now being tested. Parliament has cleared the legal path for a Merchant Discount Rate (MDR) on UPI transactions. Untangling what this actually means matters more than the headlines around it. The Taxation and Other Laws (Amendment) Bill, 2026, passed by both Houses this month, amends Se