The advertising industry’s long-discussed shift from paying agencies for people’s time to paying for results is stalling at exactly the moment many predicted it would accelerate, according to Adweek’s latest Agencies Advantage analysis published this week.
The traditional model charges clients by the full-time-equivalent — the number of staff hours assigned to an account. That model is under pressure from two directions at once. Artificial intelligence is compressing the time it takes to produce work, which shrinks the billable base, while clients facing tight budgets are asking harder questions about what their fees actually buy. The alternative, known as outcome-based or performance pay, ties agency compensation to agreed results such as sales growth or other business metrics.
Senior agency figures quoted in the reporting describe time-based billing as the old system, and some predict brands will move decisively toward value-based arrangements. Coca-Cola has been among the large advertisers signalling that its next agency relationships should connect advertising more directly to performance and sales, a position its marketing leadership has set out publicly on stage this autumn.
Yet the transition is proving slow in practice. While many agencies are testing outcome-based deals with individual clients, few are ready to convert an entire business to the model, and the reporting suggests brands themselves are hesitating. Performance pay transfers risk to agencies, but it also demands clean attribution, agreed baselines and a willingness on the client side to share the sales data needed to judge results — all of which take time to negotiate.
The stakes are structural rather than cosmetic. If AI tools genuinely allow smaller teams to deliver the same output, a fee model built on headcount produces falling revenue for agencies even when the work performs well. Holding companies and independents alike are therefore experimenting with hybrid structures: a reduced retainer for access to senior talent and technology, plus success fees linked to campaign outcomes.
There are also cultural obstacles. Outcome-based contracts work best where marketing effects can be isolated, and they work worst in brand-building activity whose payoff arrives over quarters rather than weeks. That pushes agencies toward measurable short-term activations and can underfund the slower work that builds pricing power.
For now, the industry sits between models. Agencies want the stability of retainers; clients want accountability; and AI keeps eroding the logic of the hourly rate underneath both. The Adweek analysis suggests the likely path is gradual — pilot performance deals on well-measured accounts first, then wider adoption only once both sides trust the numbers. On Friday, October 9, 2026, that trust is still being built.
Related reading: Global Ad Spend to Grow 11.9% to $1.34 Trillion in 2026, WARC Forecasts
