The management of lock-up is often overlooked in legal firms, despite it being of huge importance within a dynamic legal sector – with the uncertainty around the MoJ consultation and ongoing consolidation of the market.
The importance may be appreciated by those in the finance teams and involved in the day-to-day management, but there tends not to be the required focus from fee earners.
There are many relatively small steps which can be taken which can reap significant rewards, increasing the available working capital without increasing fees or undertaking a cost-cutting exercise.
In legal firms, lock up measures the time taken to convert work done into cash received. It is typically calculated as:
Lock up days = WIP days + Debtor days
Where:
In most firms lock-up will be by far the largest component of working capital because it represents cash that the firm has earned but not yet received. High lock up means the firm is effectively funding its clients’ legal work, often for months, while still paying staff and overheads. Even highly profitable firms can experience cash pressure if lock up is poorly controlled.
Consider a firm with annual fee income of £10 million. This equates to average daily revenue of approximately £27,000.
If total lock up is:
A reduction of just 30 lock-up days releases roughly £800,000 of cash, which can be used to invest, support revenue growth or simply be paid to owners. No need to negotiate higher fees with clients, nor any time-consuming cost cutting exercise – simply faster conversion of existing work into cash. This illustrates why lock up is often described as the quickest and lowest risk route to improving working capital in legal firms.
Time recording underpins the entire lock up cycle. If time is recorded late or inaccurately, billing is delayed and WIP becomes distorted.
Key controls include:
There are numerous software packages available to support these controls, so long as they are used consistently and to their full potential!
Strong time recording shortens the gap between work done and billing decisions, allowing WIP to move more quickly through the system.
WIP represents value created but not yet billed. In many firms, WIP can accumulate unnecessarily due to delayed billing decisions rather than genuine commercial reasons.
Effective WIP management focuses on:
In order to support this, management data should be shared regularly and KPI’s implemented to ensure that there is the requisite focus on effective WIP management.
The longer WIP remains unbilled, the higher the risk of disputes, discounts and write offs, all of which reduce both cash and profitability.
Extended debtor days place direct strain on working capital and can mask deeper client or relationship issues.
Good debtor control includes:
It is essential that there is a commercial mindset underpinning the work; there should be a regular review of the terms & conditions surrounding payment which are communicated with both clients and fee earners to ensure that they are understood and enforced, together with the internal finance function.
All of the above can feel burdensome for fee earners, who often see billing and WIP management as a separate exercise away from their core role but, in reality, it is of equal importance to advising clients and should be embedded in the client workflows, not a stand-alone matter to be considered once a month / separately. That approach is inefficient and potentially poor client care. It is best to bill with the advice / as soon as the contract allows and while matters are fresh in mind.
This should form part of firm-wide KPIs and individual objectives.
Lock up is particularly challenging in legal firms due to several structural and cultural factors:
As a result, lock up issues often persist not because they are unnoticed, but because they are difficult to challenge.
Irrespective of the size of the legal firm, improving lock-up delivers a wide range of benefits:
The benefits are clear and measurable:
A small firm with 130 days of lock up ties up around £1.1m in WIP and debtors. Reducing lock up by 25 days could release over £200k, easing reliance on overdrafts and improving resilience against unanticipated expenditure.
For a mid-tier firm, a 30–40 day reduction in lock up can release £800k–£1.5m. This can significantly reduce borrowing, smooth drawings, and fund strategic investments in technology or additional hires.
In larger firms, each lock up day can represent £130k+ of cash. Even relatively small improvements can deliver multi million pound working capital benefits and strengthen lender covenant headroom.
Effective lock up management requires a combination of process, discipline, and accountability.
Practical steps include:
By reducing lock up, legal firms can unlock significant working capital, strengthen financial stability, and fund growth, all without increasing fees or compromising client service.
Lock up is not simply a finance issue; it is a strategic lever that well run legal firms actively manage.
If you’d like to discuss how your firm can improve lock-up, strengthen cash flow and unlock working capital, our specialist professional services team would be happy to help. Get in touch with us today.
What is lock-up in a legal firm?Lock-up in a legal firm measures the time taken to convert work done into cash received. It is calculated as WIP days (the average time between work being carried out and the bill being raised) plus debtor days (the average time between a bill being issued and cash being collected). In most firms, lock-up represents the largest component of working capital.
Why does lock-up matter for law firm cash flow?High lock-up means a firm is effectively funding its clients’ legal work, often for months, while continuing to pay staff and overheads. Even highly profitable firms can experience cash pressure if lock-up is poorly controlled. Reducing lock-up releases cash already earned without requiring fee increases or cost-cutting.
How much cash can reducing lock-up release?The impact is significant. For a firm with £10m in annual fees, reducing lock-up by 30 days releases roughly £800,000 of cash. A smaller firm with £3m in fees could release over £200,000 from a 25-day reduction. In larger firms with £50m+ in fees, each lock-up day can represent more than £130,000 of working capital.
What are the main causes of high lock-up in law firms?Lock-up tends to be high due to a combination of structural and cultural factors. Partners are often reluctant to disrupt client relationships by chasing payment. Long and uncertain matter lifecycles — particularly in litigation — delay billing. Corporate and public sector clients frequently impose extended payment terms, and fixed or contingent fee structures can defer cash receipt further.
How can legal firms reduce WIP days?WIP days fall when billing decisions are made faster. Moving to monthly or milestone-based billing rather than waiting for matter completion, raising interim bills on long-running cases, holding regular WIP reviews to identify unbilled completed work, and discussing escalating costs with clients early can all help to reduce WIP days. The longer WIP remains unbilled, the greater the risk of disputes, discounts, and write-offs.
What role does time recording play in managing lock-up?Time recording underpins the entire lock-up cycle. When time is recorded late or inaccurately, billing is delayed and WIP figures become distorted. Firms should set clear expectations for daily or contemporaneous recording, provide simple time-capture tools, and run regular exception reports to highlight missing entries. Strong time recording shortens the gap between work done and the billing decision.
How should law firms manage debtor days effectively?Good debtor control starts before work begins. Payment terms should be agreed and communicated clearly at the outset. Bills should be issued promptly once approved, followed up consistently before invoices become overdue, with a clear escalation process — including pausing work if necessary — where non-payment persists. Embedding this discipline within client workflows, rather than treating it as a separate finance function task, produces better results.
What KPIs should legal firms track for lock-up management?Firms should track total lock-up days broken down by fee earner and department, alongside WIP days and debtor days separately. Regular structured reviews against these KPIs, with transparency across the firm, enable early intervention on ageing items. Lock-up metrics should form part of both firm-wide performance targets and individual fee earner objectives.
What are the benefits of reducing lock-up days for a law firm?Reducing lock-up delivers stronger liquidity, lower borrowing costs, more predictable cash flow forecasts, and reduced pressure around tax, VAT, and drawings payments. It also lowers the risk of write-offs and improves realised profitability. Firms become more resilient during economic downturns and better placed to fund strategic investments in technology or additional hires.
Is lock-up management only relevant for large law firms?Lock-up management matters at every size. A small firm with £3m in fees and 130 days of lock-up has around £1.1m tied up in WIP and debtors. A mid-tier firm with £10-15m in fees can release £800,000 to £1.5m from a 30-40 day reduction. The principles — faster billing, consistent debtor follow-up, and firm-wide KPIs — apply regardless of firm size.
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