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Legacy Modernisation — The ₹47,000 Crore Problem India's Banks Can No Longer Ignore

Jun 2025
8 min read
Legacy Modernisation — The ₹47,000 Crore Problem India's Banks Can No Longer Ignore

India's Banking Paradox

India's banking sector operates the world's most innovative real-time payments infrastructure — UPI processed 16.73 billion transactions in December 2024 alone — while simultaneously running core banking systems built in the 1980s and 1990s on COBOL and mainframe architectures that were never designed for this volume or pace.

The Hidden Cost of Legacy

The Reserve Bank of India's 2025 Financial Stability Report identified legacy IT infrastructure as one of the top five systemic risks to the Indian banking sector. Not because the old systems fail — most are extraordinarily robust — but because they make change prohibitively expensive and dangerously slow.

  • Every new product launch — BNPL, co-branded cards, account aggregator APIs — requires expensive integration with legacy systems
  • Workarounds accumulate, integration debt compounds, and the cost of the next change increases
  • Goldman Sachs and JPMorgan have spent years and significant capital on similar modernisation
  • HDFC Bank and Kotak Mahindra Bank have both made public commitments to core system modernisation

The Modernisation Imperative

The enterprises that complete this work unlock the ability to ship at the pace the market demands. Those that delay are paying an increasing hidden tax on every product decision they make.

The Strategic Stake

When a bank wants to launch a new product, the limiting factor is almost never market demand or regulatory approval. It is the time and cost required to build capability into or around a core system that wasn't designed for it. That is the ₹47,000 crore problem.

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