Deloitte warns consultants: AI will reshape billing by 2035

Consulting powerhouse Deloitte has told its own ranks to brace for a radical shift: within 11 years, the classic billable-hour model may shrink to a mere remnant of the consulting market. An internal presentation projects that AI agents will handle routine tasks now billed by the hour, leaving firms scrambling for new ways to charge clients.

The coming AI reshuffle in professional services

Internal slides circulated at Deloitte paint a stark picture: AI-driven automation will erode the volume of work that consultants currently log and invoice by the hour. The message is blunt—“Our model is toast,” one consultant summarized the briefing. Rather than clinging to time-based fees, the firm is signaling a pivot toward value-driven or outcome-based pricing, mirroring shifts already under scrutiny at rivals McKinsey and BCG.

Why hourly billing is losing its grip

The traditional model relies on human labor logged in six-minute increments, a system built for a pre-AI era. As generative AI takes over document review, data analysis, and even drafting, the volume of billable minutes naturally declines. Consulting leaders now face a choice: either defend the shrinking slice of hourly work or rethink how they price expertise altogether.

What comes next for the big three

McKinsey and BCG have begun testing subscription-style retainers, fixed-fee projects, and performance-linked bonuses to cushion the blow. Deloitte’s forecast suggests that by 2035 most engagements will be structured around outcomes rather than hours, with AI agents serving as co-pilots rather than line items on an invoice. The message is clear: adapt or risk being outpaced by the very tools that once promised efficiency gains.

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Source: The Decoder. AI-assisted editorial synthesis — TechnoExpress.