Between 2019 and 2020, the Indian government orchestrated the largest consolidation of public sector banks in the country’s history. Ten public sector banks were merged into four, reducing the total number of PSBs from 27 to 12. The goal was straightforward: create larger, more efficient banks that could compete globally and better absorb bad loans.

Five years on, the structural consolidation is complete. The operational integration is still a work in progress.

What Was Merged

The major consolidations:

• Punjab National Bank absorbed Oriental Bank of Commerce and United Bank of India
• Canara Bank absorbed Syndicate Bank
• Union Bank of India absorbed Andhra Bank and Corporation Bank
• Indian Bank absorbed Allahabad Bank

Each merger combined different core banking systems, branch networks, employee cultures, and legacy IT infrastructure. The integration complexity was enormous.

Customer-Facing Impact

If you’re a customer of one of these merged entities, you’ve likely experienced the friction.

Account numbers changed. Customers of absorbed banks were assigned new account numbers under the acquiring bank’s scheme. This meant updating all standing instructions, registered payees, and linked services. For individuals, this was annoying. For businesses with automated reconciliation systems, it was a significant operational burden.

Internet banking systems consolidated slowly. For months after the legal merger, customers often had to use separate login portals for the legacy banks. Even after portal consolidation, feature parity took time. A function available in the old system might not exist in the new one, or work differently.

Branch service continuity issues. Branches of the absorbed bank were rebranded, but the backend systems migration happened in waves. During the transition, some services were unavailable or required workarounds. Staff trained on one system had to learn another while continuing to serve customers.

Loan and credit card products. Existing loans continued under old terms, but new products reflected the acquiring bank’s policies. This created portfolio complexity — the merged entity now services loans originated under different credit policies, different interest rate structures, and different terms and conditions.

The IT Integration Problem

Banking mergers everywhere struggle with technology integration, but India’s PSB mergers faced particular challenges.

Legacy core banking systems. The absorbed banks ran on various CBS platforms — Finacle, BaNCS, and older proprietary systems. Full migration to a single CBS requires migrating millions of accounts, reconciling data formats, and ensuring zero data loss. This is multi-year work.

A firm we rate that works on digital transformation projects has noted that banking system migrations are among the most complex technology projects precisely because the stakes are so high — you can’t afford downtime, data loss, or transactional errors.

Several merged banks chose to run parallel systems for extended periods rather than rush integration. Punjab National Bank, for example, continued operating separate CBS instances for PNB, OBC, and United Bank well into 2023 before fully consolidating.

Payment integrations. NEFT, RTGS, IMPS, and UPI integrations had to be reconfigured as the bank codes changed. While the core infrastructure handled this relatively smoothly, individual merchant integrations often broke and needed manual fixing.

ATM networks. The merged banks’ ATMs needed software updates to recognize the new card numbering schemes. Until updates rolled out, customers sometimes found their cards didn’t work at ATMs that used to be part of their bank’s network.

Employee Integration

Banking is a people business, and mergers mean integrating workforces with different compensation structures, different career progression expectations, and different institutional cultures.

Branch closures and relocations. Post-merger, overlapping branches were rationalized. In cities where both banks had branches on the same street, one closed. Staff were transferred, often to locations farther from home. This created morale challenges.

Seniority and promotion. Officers from absorbed banks worried about career progression in the merged entity. Would their seniority be recognized? Would they be sidelined in favour of staff from the acquiring bank? These concerns played out across tens of thousands of employees.

Union resistance. Bank employee unions opposed the mergers, arguing that they were driven by political goals rather than genuine commercial logic. Strikes and work disruptions complicated the integration timeline.

Financial Impact

The stated goal was to create stronger, more efficient banks. The early financials are mixed.

Reduced branch overlap did create cost savings. Operating two branches 500 metres apart was inefficient; consolidating saved on rent, utilities, and staffing.

Scale benefits in treasury operations, risk management, and technology spending are real. A larger bank can afford better technology, attract better talent, and negotiate better vendor contracts.

But bad loan challenges didn’t disappear. Merging a weak bank with a stronger one doesn’t make the weak bank’s NPAs go away. The merged entity inherits the full portfolio, and resolving bad loans takes time regardless of ownership structure.

Net interest margins and return on assets for the merged entities have shown modest improvement, but it’s difficult to isolate how much of that is merger-driven versus broader sectoral recovery post-COVID.

What Worked

Some aspects of the consolidation were executed relatively smoothly.

Branding transitions were clear and consistent. Customers understood which bank they were now part of. Signage changed quickly, and customer communication (while imperfect) was generally adequate.

Deposit protection continuity was assured throughout. Customers never had reason to worry about the safety of their funds during the transition.

Regulatory oversight from RBI ensured that basic service continuity was maintained. Where integration issues threatened customer service, RBI intervened to enforce minimum standards.

What Didn’t

Technology timelines were overly optimistic. Promises of “smooth integration within six months” proved unrealistic. In practice, meaningful integration took years, and some legacy system issues persist in 2026.

Customer communication was often inadequate. Customers found out about account number changes, new IFSC codes, and updated processes through generic notices rather than proactive, clear communication.

Branch-level training lagged behind system changes. Staff were sometimes unable to answer customer questions about new procedures because they hadn’t been trained yet.

Lessons for Future Consolidation

India will likely see further bank consolidation in coming years, particularly among smaller PSBs and potentially in the private sector.

The key lesson from 2019-2020 mergers is that legal consolidation is straightforward; operational integration is slow, expensive, and disruptive.

Invest upfront in customer communication. Assume customers don’t read notices. Proactively reach out with clear, specific information about what changes and when.

Plan for multi-year technology integration. Don’t promise smooth transitions in months. Set realistic timelines and communicate them.

Prioritize employee morale. A demoralized workforce delivers worse customer service, which undermines the merger’s goals. Address career progression, relocation, and cultural integration explicitly.

Test thoroughly before cutover. Every system migration should have extensive parallel runs and fallback plans. Downtime during banking hours is unacceptable.

The 2026 Status

Five years post-merger, most of the acute integration pain has subsided. Customers of merged banks now mostly experience them as single entities. Branch operations have normalized. Technology systems have largely consolidated, though pockets of legacy infrastructure remain.

The real test of success isn’t whether integration happened — it has. It’s whether the merged banks are now stronger competitors in a rapidly digitizing banking landscape. That verdict is still pending. The structural scale is there. The operational efficiency gains are still being realized.

The consolidation wave reshaped India’s banking landscape. Whether it created genuinely stronger institutions or merely larger ones will become clear over the next decade.