Decoding the real costs behind UPI's zero-fee model amid escalating transaction volumes

The widespread use of India’s UPI system has brought to light the complex economics of its zero-fee structure, with growing transaction volumes challenging its sustainability and revealing layered costs for merchants and providers alike.

The uproar around Unified Payments Interface charges has a familiar pattern: a surge of social media alarm, followed by a closer look at the mechanics of the system and a far more nuanced picture. The Commune Mag recently argued that many users mistake the absence of a visible fee for a promise that every part of the UPI network is costless. In reality, each payment moves through a chain of banks, apps and the National Payments Corporation of India, all of which require infrastructure, compliance and security spending.

That background matters because UPI has become enormous. LiveMint reported that the system processed 22.72 billion transactions worth ₹28.92 trillion in June 2026 alone, or about 757 million transactions a day. At that scale, debate over the merchant discount rate, or MDR, is no longer a technical footnote but a question about who pays to keep the network running. Supporters of the current zero-fee model say it has driven adoption, while critics argue the arrangement becomes harder to sustain as volumes rise and commercial use expands.

The economics are not quite as simple as “free” or “charged”. Zoho Payments says standard person-to-merchant UPI debits are still operating under the government-backed zero-MDR structure, but merchants can still face other expenses, including platform fees, failed-transaction handling, refund processing and recovery work. Razorpay has made a similar distinction, arguing that payment gateways still incur real costs in providing business-grade infrastructure even when the headline MDR is zero.

There are also exceptions that complicate the public debate. According to reports from Medianama and other industry outlets, NPCI lowered certain fees linked to RuPay credit card payments made through UPI from April 1, 2026, a move that affected how some fintech firms handle those transactions. Takkada has also noted that some merchants may encounter per-transaction app charges or other costs layered on top of the zero-MDR headline, which means the real price of accepting UPI can depend on the payment route, the provider and the merchant’s own transaction profile. For small businesses, the practical lesson is not that UPI has become expensive, but that its cost structure is more complex than the slogans suggest.