Why lock-up remains the biggest silent drain on law firm profitability
Across the legal sector, many firms have been reporting healthy revenues and strong profitability on paper, yet the same firms are still experiencing persistent cash pressure. Partner drawings feel tighter than expected. Investment decisions are delayed. Working capital facilities are used more than planned. In most cases, this isn’t due to a lack of client work or a decline in demand, it’s driven by lock-up.
Lock-up represents the difference in time between the work being done and cash being received. The funds remain in the work in progress and unpaid bills portion of your finances. Due to the build being so gradual, it often escapes attention until it starts to restrict the firm’s ability to operate comfortably. By the time it becomes a notable problem, it has usually been embedded in the day-to-day behaviours of your business.
Why it matters
Lock-up is one of the most significant yet least visible drains on a law firm’s profitability. Having a high lock-up means that cash which has already been earned isn’t currently available to the firm. This, in turn, creates a misleading picture of the firm’s financial health, as reported profits don’t translate into usable cash.
For partners within the firm, this can mean uncertainty around drawings, unexpected calls for capital or pressure to reduce distributions. For leadership teams, it limits the firm’s ability to invest in the firm’s future, whether that be in people, technology or growth opportunities. If the issue persists over time, it can also increase reliance on overdrafts or external funding, adding a layer of unnecessary cost and risk to the equation.
Perhaps most importantly, consistent lockups mask the firm’s inefficiencies. Firms may believe they have a pricing issue, a resourcing issue or a demand issue, when the underlying problem is simply that value is not being converted into cash efficiently.
How it works
Lock-up rarely stems from a single failure. It develops through a repeated series of small, often well-intentioned, delays that eventually become habitual. Files remain open longer than necessary, billing is deferred until the matter feels complete (especially when interim billing would be a more appropriate course of action), draft bills remain unreviewed while fee earners prioritise receiving new work, and credit control becomes reactive rather than sticking to a more structured approach.
In many firms, ownership of lock-up is unclear. Fee earners assume finance will chase unfinalised bills. Finance teams often hesitate to challenge partners, meanwhile partners focus on fee generation rather than financial competency. Every individual delay feels like a minor setback, but collectively they extend the cash cycle significantly.
Because lock-up’s are usually spread across teams and matters, it can often be difficult to discover them without going through a proper analysis. Average days may look reasonable, while specific departments or partners carry disproportionate levels of unbilled or unpaid work. Without the correct level of in depth analysis, firms often underestimate the scale of the issue.
Who’s affected
Managing partners and finance directors will feel the impact most directly. They’re the ones responsible for cash flow, funding and financial stability - yet they may have limited amounts of control over the behaviours that drive lock-up. Partner tensions can arise when the profit margins look to be strong, but drawings remain constrained.
Partners are often affected through a decrease of flexibilities in their finances and increased scrutiny surrounding billing and credit control. Over a prolonged period of time, high lock-up can also affect firm valuations and succession planning, especially since exit arrangements primarily rely on predictable cash generation.
Fee earners are also indirectly affected too. Slower billing and extended lock-ups can often lead to pressure on write-offs, alterations needed for billing policies or a tightening of controls that stem from reactivity rather than support. In some cases, it can even influence decisions on the recruitment process, progression and investment in support.
When it applies
Lock-up isn’t just a seasonal issue or a year-end problem. It’s always applicable and needs to be regularly reviewed. It becomes most prominent during moments of stress or change, such as partner distribution discussions, lateral hires, mergers, office moves or investment in new systems.
It’s a common theme for periods of growth to exacerbate lock-up if processes don’t scale with the firm. Equally, times where trading periods are quieter can easily expose any weaknesses in billing discipline. Too many firms address their lock-up only in cases when cash becomes tight, but more often than not it’s too late to rectify the issue correctly.
The firms with the most effective processes treat lock-up as a constant management discipline rather than a seasonal clean-up exercise.
How DSK can help
DSK works with law firms in order to bring clarity to any lock-up and its underlying causes. This starts with performing a detailed analysis, not just recording headline averages, to identify where the cash is being trapped and why. The focus is on understanding behaviours, incentives and processes rather than allocating blame.
Our job is also to help firms design controls that are proportionate to their culture and structure. This may include an improvement in visibility of WIP and debt, clarifying ownership between partners and finance teams, refining billing timetables or introducing a way to forecast links between lock-up to drawings and decisions made.
The aim isn’t to enforce rigid rules to stop lock-ups, but to improve cash conversion in a way that supports fee earners and gives the firm an overall greater financial flexibility. Once addressed properly, reducing lock-up can unlock significant value without increasing fees or workload. Get in touch with our team here at DSK to find out how we can improve your processes.