Deloitte tells its own consultants: AI is coming for the billable hour

The business move

Deloitte has openly warned its consultants that the consulting industry’s traditional billable hour model faces a massive threat from AI. Internal presentations at Deloitte project that by 2035, hourly billing will shrink to a “thin sliver” of the market, replaced by AI-driven agents that automate many advisory tasks. Other top firms like McKinsey and BCG are already testing new revenue approaches that move away from time-based fees.

Why it matters

The billable hour has been consulting’s backbone for decades. Moving away from it means transforming how firms price and deliver value. AI agents can churn through data and deliver insights faster and cheaper than human consultants, starving billable hours at scale. This pressures consultancies to rethink entire business models and compensation structures. It will also reshape how clients evaluate consulting value — no longer paying for time but for outcomes potentially delivered by AI. This shift speeds automation’s impact on a high-dollar professional service sector, challenging the long-standing premium placed on expert human hours.

Who gains and who gets squeezed

Clients stand to gain from lower costs and faster turnaround as AI agents replace routine consulting work. Cutting billable hours lowers friction for procurement and increases transparency around deliverables. On the flip side, consultants face shrinking revenue pools, intensified competition, and pressure to build skills managing or complementing AI tools. Firms that fail to adapt risk losing market share. Leading consultancies experimenting with new pricing and service models will gain an edge, while those clinging to hourly billing face obsolescence.

What to watch next

How Deloitte, McKinsey, and BCG monetize non-hourly advisory services will be key. Watch for new bundled pricing, subscription, or outcome-based contracts backed by AI capabilities. Also, see how consulting workforces evolve — will more roles shift toward AI supervision, integration, and strategic use? Regulation or client pushback around AI replacing human judgment in advisory roles could complicate matters. Overall, this trend tightens cost pressures and forces rapid recalibration for high-end consulting business models.

AI Quick Briefs Editorial Desk