AI Adoption Has Forced Law Firms to Rethink Billing
Automation has reached 90% of legal professionals, threatening the standard billable-hour model.
Updated on Oct. 10, 2026 in Artificial Intelligence
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Ninety percent of legal professionals in the U.K. and Ireland are using artificial intelligence to automate research and drafting. This shift has enabled 80% of firms to handle higher workloads without increasing headcount, creating pressure on traditional billable-hour business models.
Why it matters
AI is decoupling output from time spent, a change that threatens a billing structure that has defined the legal industry for decades. As automation absorbs administrative tasks once performed by junior lawyers, firms are being forced to find new ways to define value.
While 72% of legal work is currently billed by the hour, that figure is projected to drop to 44% within three years. Currently, 20% of firms that have widely adopted AI report difficulty meeting their billable-hour targets.
The players
A&O Shearman
A global law firm using AI agents to accelerate loan agreement reviews and regulatory analysis.
Slaughter and May
A London-based law firm that integrated AI across its full practice footprint in 2026.
The details
Law firms are deploying AI agents—specialized software designed to execute autonomous tasks—to review complex loan agreements and analyze regulatory filings in minutes rather than hours. This automation replaces the repetitive research and drafting workflows traditionally used to train junior staff. Because AI allows for faster document processing, the human labor component of legal services is shrinking, leading to a disconnect between legacy billing and modern efficiency.
Timeline
2026: Slaughter and May implemented AI across all practice areas.
Next 2-3 years: The share of hourly-billed work is projected to fall to 44%.
The Tech Race
This transition marks a rapid departure from the traditional hourly model toward efficiency-based pricing. The industry is currently locked in a race to redefine associate training as automated agents replace the manual tasks that previously anchored junior lawyer development.
For legal professionals, the shift is already changing work-life balance, with 51% currently working evenings and 22% working weekends. As firms transition to fixed or value-based pricing, clients should expect more predictable billing structures as the hours-worked metric declines in relevance.
The takeaway
The billable-hour model is in a period of decline as law firms prioritize efficiency over time-based labor. Legal professionals should watch for firms shifting to flat-fee arrangements or subscription-based models over the next 24 to 36 months.
Further reading
For more on the industry-wide shift toward automation, read our analysis in Artificial Intelligence.
Source note: This article includes information reported by CNBC.
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