In the decade since its launch, India’s Unified Payments Interface (UPI) has evolved from a promising digital experiment into critical economic infrastructure. Against this backdrop, the Union Finance Ministry has notified that the National Payments Corporation of India (NPCI) will operationalise a 0.4% Merchant Discount Rate (MDR) on specified merchant transactions above ₹2,000 from October 15. While consumers will not be charged directly, this marks a significant departure from UPI’s zero-MDR model for merchants. While the reasoning is understandable, considering the costs to run UPI, one question deserves an answer: what has UPI cost India, and what has it saved?

The costs are easy to see as servers, security and fraud controls show up on balance sheets, while the savings are scattered across the economy. For example, take a small shopkeeper. Before digital payments, taking cash meant counting notes, keeping change, guarding the till and making trips to the bank, with the added risk of theft. UPI removed most of that, with customers also saving themselves a few trips to the ATM. Further, banks now handle less physical cash, businesses reconcile accounts faster, lenders are able to read a small trader’s cash flow from digital records, and most importantly, the government gets a trail that helps with formalisation and tax compliance. None of this is revenue to UPI; it is spread across banks, consumers and the exchequer.