McKinsey: Global Business Services Will Shrink 20–30% and Get More Strategic

McKinsey is telling global business services (GBS) leaders to expect their organizations to end up “20 to 30 percent smaller but dramatically more productive than they are today.” That’s the headline framing in the firm’s new piece on agentic AI’s effect on shared services, and the twist is that McKinsey doesn’t treat the shrinkage as the story. The story is what GBS becomes once it’s smaller: less a cost-cutting back office, more a strategic backbone for how the rest of the enterprise adopts AI.

Roughly half of advanced clients have already begun piloting AI use cases inside GBS, and McKinsey’s finding is that the successful ones aren’t automating isolated tasks — they’re reimagining entire end-to-end processes. That shift pushes GBS scope beyond transactional work like procure-to-pay into higher-value advisory functions: strategic procurement, forecasting, real-time compliance monitoring. McKinsey’s own framing captures the pitch: “AI isn’t replacing GBS; it’s actually augmenting it.”

The talent implication is the part with teeth. McKinsey argues companies need to move from a pyramid-shaped talent model to a “diamond” — fewer entry-level roles, a thicker middle tier of analytical staff, and a new layer of people who manage and govern AI agents rather than execute transactions directly. Implementation splits into two paths: “right-shore-first,” relocating work to GBS centers before automating, or “automate-first,” redesigning the process before consolidating it.

BCG’s companion research on agentic AI adoption puts a number on how early this still is broadly: only 5% of companies are genuinely “agent-first” today, even though 72% report some mix of production and pilot deployment, and BCG attributes 70% of what separates the leaders from everyone else to change management rather than algorithms. McKinsey’s GBS piece reads like a specific answer to that broader problem — a concrete operating model for where agentic AI governance actually lives once the pilots have to become permanent.