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Law Firm Operations & Productivity

Who’s On Trial: Your Billing Model

By Sagar Pratap SinghPublished 14 May 2025Last updated 30 Sept 2026

71% of clients prefer a flat fee for the whole case, yet 90% of US legal dollars still flow through hourly billing. How to pilot flat fees without losing margin.

Full issue

The billable hour is not dead, and anyone who says so has not read a large-firm invoice lately. But it is losing the argument with clients, and AI is about to turn that argument into a margin problem. The firms that build a flat-fee option now will own the matters where price certainty decides who gets hired.

Clients have already voted

Clio's 2024 Legal Trends Report found 71% of clients would rather pay a flat fee for their entire case, and 51% would prefer flat fees for individual activities. Clio's May 2026 report on solo and small firms repeats the 71% figure. Two years, same answer. The complaint underneath is simple: an hourly quote moves all the uncertainty onto the buyer. Thomson Reuters Institute put it bluntly, calling hourly rates "set arbitrarily" and detached from any measure of quality.

Firms have not moved with them

Thomson Reuters' 2026 State of the US Legal Market report says 90% of legal dollars still flow through hourly billing, and worked rates rose a record 7.3% in 2025. Clio's 2026 report found 86% of solos and 78% of small firms have not changed their pricing at all, despite adopting AI. The "billable hour is effectively dead" line people love to quote comes from a 2017 Georgetown and Thomson Reuters report. Nine years later, the hour still pays most of the bills.

Why the lag? Ask it five times. Firms stay hourly because it feels safe. It feels safe because they do not know their true cost per matter. They do not know it because time data sits in billing software that nobody analyses by matter type. So a fixed fee feels like a guess, and nobody guesses with partner compensation on the line. The root cause is not culture. It is missing cost data, and that is fixable.

AI turns preference into a margin problem

Clio estimates up to 74% of hourly billable tasks could be automated. If you bill by the hour, every hour AI saves is revenue you hand back, and ABA Formal Opinion 512 is clear that hourly lawyers bill actual time. On a fixed fee, the same efficiency becomes margin. That argument did not exist in this form three years ago.

Flat fees also fix cash flow. Clio found flat-fee firms are five times more likely to send the bill as soon as the work is done and nearly twice as likely to be paid almost immediately. Firms now bill 34% more of their cases on flat fees than in 2016.

How to switch without betting the firm

Start with one predictable matter type: a simple estate plan, a trademark filing, the pre-suit phase of a PI claim. Pull the last 20 closed matters of that type, find the median hours and the spread, and price at the median plus a margin for variance. Put the scope in writing, including what reverts to hourly. Offer both options for a quarter and watch what clients pick.

Then lower your delivery cost. Push work to the lowest competent level: paralegals, automation, or remote support staff. As an illustration, if a partner's hour costs $300 and a trained paralegal's costs $50, moving document collation down changes the math of every flat fee you quote. Remote and outsourced teams also absorb volume spikes without a permanent salary line, which matters when a fixed fee caps revenue per matter.

Finally, change what you reward. If bonuses track billed hours, lawyers will quietly sink the pilot. Reward margin per matter and client retention.

What to do this week

Pick one repeatable matter type and pull hours data from your last 20 closed files.
Write a one-page flat-fee scope: included work, exclusions, hourly add-ons.
Add a flat-fee option to your next five engagement letters and track acceptance.
List three tasks in that matter type you can move to a paralegal, a tool or a remote team.