Critically evaluate the role of interoperable digital payment systems like UPI in reducing cash dependency and formalizing India's economy.

Interoperability — the ability to pay any bank account from any app — is UPI's defining feature. Recognised by the IMF (June 2025) as the world's largest real-time payment system by volume [2], UPI has visibly displaced cash, though its formalisation impact is narrower than its headline numbers suggest.

Success in reducing cash dependency

• Scale: volumes rose from 2 crore transactions (FY 2016-17) to 24,162 crore (FY 2025-26) — an almost 12,000-fold surge [1].
• Universal acceptance: banks live on UPI grew from 44 to 703 [1], covering 491 million individuals and 65 million merchants [3].
• Low-cost onboarding: QR-based acceptance lets street vendors take digital payments without costly POS terminals, displacing cash at the everyday retail level [3].
• Global benchmark: ~49% of global real-time payment volume (ACI Worldwide, 2024) [2], now live in seven countries including UAE, Singapore and France [1].

Contribution to formalisation

• Each payment leaves an auditable digital trail, widening the data base for cash-flow-based lending to small enterprises.
• Transaction value grew from ₹1 lakh crore (FY 2017-18) to ₹139 lakh crore (FY 2022-23), a CAGR of 168% [4], indicating deepening merchant, not merely peer-to-peer, use.

Critical limitations

• Small-ticket skew: FY 2025-26 value (~₹314 lakh crore) over 24,162 crore transactions implies an average ticket near ₹1,300 [1] — high-value informal dealings, especially in real estate, still run on cash.
• Digital trail ≠ tax net: a vendor accepting UPI need not register for GST; the data exists but is not automatically integrated with tax administration.
• Access gap: with 491 million users [3], a large share of adults — elderly, low-literacy, poor-connectivity — remain outside.
• Rising payment frauds and concentration of volumes in a few private apps pose consumer-protection and systemic risks.

UPI has decisively formalised the payment habit; formalising the economy requires linking its trail to tax, credit and social-security systems. Strengthening grievance redress, cybersecurity and offline/feature-phone access can convert this digital public infrastructure into genuine, inclusive economic formalisation.