For many small practices, the billing problem is not a shortage of work. It is the gap between completing the work and turning it into an accurate invoice that reaches the client.
Time is recorded late. Draft bills wait for approval. Disbursements are missed. Completed matters remain in WIP longer than they should.
A stronger law firm billing process closes that gap and helps the firm turn work into cash more consistently. It also has a compliance dimension that is easy to overlook: under Rule 1.5 of the SRA Transparency Rules, firms are already required to publish clear costs information — the basis of charges, likely disbursements, and the key stages and timescales of a matter — for a defined set of services. A billing process that cannot reliably produce accurate, timely invoices makes it harder to honour the cost estimates the firm has already committed to publicly.
A law firm billing process starts before the invoice
Good billing begins when the matter opens, not when somebody decides it is time to raise a bill.
The fee basis, rates, billing contact, payment terms and expected billing frequency should be clear from the outset. This is also where the Transparency Rules obligation is easiest to meet properly: if the cost estimate given to the client at matter opening matches what the firm actually intends to bill and when, there is far less room for later dispute.
Once work begins, time and relevant costs need to reach the matter promptly. Otherwise, the finance team is forced to reconstruct information when the bill is eventually prepared. That creates delays and increases the chance that items will be overlooked.
Why WIP can become a cashflow problem
WIP represents work the firm has carried out but has not yet converted into an invoice.
Some WIP is expected. The problem arises when it grows because matters are not reviewed or draft bills remain in approval queues.
At that point, reported activity may look healthy while cash remains tight. This is one reason profitable law firms can still experience cash pressure. The firm has earned value, but the billing process has not yet converted it into something the client can pay.
Bill approval needs a clear owner
Drafting a bill does not mean the billing process is complete.
In small firms, approval often sits with a busy partner who may also be managing client work, supervision and business development. Without a defined timetable, draft bills can remain untouched for days or weeks.
We recommend making ownership explicit. Partners should receive a concise view of bills awaiting approval, how long they have been outstanding and what action is required. That creates accountability without producing another large finance report.
In practice: one client firm — a mixed commercial and private client practice — had draft bills sitting in an approval queue for an average of 11 days before a partner even looked at them, simply because no single person owned the review. Introducing a weekly 15-minute approval slot, with a standing list of anything over five days old, cut that average to under three days within a month, with no change to the underlying billing volume.
Better billing improves more than cashflow
Prompt billing also improves the client experience.
Clients are generally better able to understand invoices when they receive them close to the work being performed. Questions can be resolved while the matter is still fresh and unexpected large bills become less likely.
Regular billing can also make credit control easier because the firm identifies payment issues earlier. By contrast, issuing one large invoice months after the work was completed can make both explanation and collection harder — and sits awkwardly against the “likely timescales for each stage” that Rule 1.5 requires the firm to have already told the client.
What the SRA Transparency Rules require, and why billing process is the practical link
Transparency Rules requirement (Rule 1.5)
How billing process delivers it
Total cost or range of costs
Requires accurate WIP tracking against the original estimate
Basis of charges (hourly rate / fixed fee)
Set at matter opening, held consistently through billing
Key stages and likely timescales
Only credible if bills are actually issued at those stages
Disbursements and VAT treatment
Depends on costs reaching the matter promptly, not reconstructed later
The Rules set out what firms must tell clients up front. The billing process is what makes that commitment deliverable in practice, rather than an estimate the firm quietly drifts away from.
Measure how quickly work moves from WIP to cash
A good billing process should be visible through management information.
Partners should be able to see how much WIP remains unbilled, which draft bills are waiting for approval and how long invoices take to convert into cash. These measures connect billing directly to the wider financial health of the firm.
If WIP rises every month while billing remains flat, the firm needs to understand why. Likewise, growing revenue means less if debtors are increasing at the same time.
Technology should support the workflow
Systems such as Clio and Xero can support a strong billing process, but software cannot replace ownership.
Matter setup needs to be consistent. Time and expenses need to be recorded correctly. Draft bills need a clear approval route, and the accounting records should reflect the final position accurately.
Where those processes are disconnected, the technology can end up displaying the symptoms rather than solving the problem. We therefore focus first on the workflow and then on configuring systems to support it.
What good billing looks like in a small firm
A small practice does not need a complicated billing department. It needs a dependable rhythm.
Time recording should remain current, WIP should be reviewed regularly and draft bills should have defined approval deadlines. Once invoices are issued, collection responsibility should also be clear.
The process must continue when a partner is on holiday, in court or focused on a major matter. That consistency is what turns billing from a month-end scramble into a normal part of financial management.
How AM Strategic can help
At AM Strategic, we help law firms design and operate billing processes that connect WIP, Clio, Xero, collections and management reporting.
Our role is not simply to produce invoices. We help create a finance process that shows partners where work is sitting, what needs approval and how effectively billed fees are converting into cash — and that keeps the firm’s actual billing practice aligned with what it has already told clients to expect.
If delayed billing or growing WIP is putting pressure on your firm’s cashflow, book a consultation with AM Strategic to review your current process.
Frequently Asked Questions
1. What should a good law firm billing process include? It should cover matter setup, time and cost recording, WIP review, draft preparation, approval, invoice issue and collection.
2. How does the SRA Transparency Rules regime affect billing? Rule 1.5 requires firms to publish clear costs information — total cost or range, basis of charges, disbursements and likely timescales — for defined services. A billing process that cannot deliver accurate, timely invoices makes it harder to stay consistent with that published information.
3. Why do law firms build up large amounts of WIP? Common causes include late time recording, infrequent billing, delayed approvals and a lack of ownership over which matters should be billed.
4. Can better billing improve cashflow? Yes. Faster billing reduces the first part of lock-up by shortening the period between completing work and issuing the invoice.
5. Can billing be outsourced? Yes. Elements of billing administration can be outsourced, while the firm retains the appropriate responsibility and approval over its fees and client relationships.
Adam Bent is a trusted financial leadership expert with 30 years of experience helping startups and small to medium-sized businesses achieve faster growth. He guides companies to success through strategic financial planning and implementation, using his expertise to build actionable turnaround plans for businesses in financial distress.
Having seen many entrepreneurs with great ideas struggle due to a lack of financial expertise, Adam specialises in translating vision into viable, practical financial models, offering dedicated support every step of the way.
Driven by the reward of seeing businesses thrive, he founded AM Strategic Consultancy to help companies realise their full growth potential.
Adam Bent is licensed and regulated by the AAT under licence number 1005891.
For many small practices, the billing problem is not a shortage of work. It is the gap between completing the work and turning it into an accurate invoice that reaches the client.
Time is recorded late. Draft bills wait for approval. Disbursements are missed. Completed matters remain in WIP longer than they should.
A stronger law firm billing process closes that gap and helps the firm turn work into cash more consistently. It also has a compliance dimension that is easy to overlook: under Rule 1.5 of the SRA Transparency Rules, firms are already required to publish clear costs information — the basis of charges, likely disbursements, and the key stages and timescales of a matter — for a defined set of services. A billing process that cannot reliably produce accurate, timely invoices makes it harder to honour the cost estimates the firm has already committed to publicly.
A law firm billing process starts before the invoice
Good billing begins when the matter opens, not when somebody decides it is time to raise a bill.
The fee basis, rates, billing contact, payment terms and expected billing frequency should be clear from the outset. This is also where the Transparency Rules obligation is easiest to meet properly: if the cost estimate given to the client at matter opening matches what the firm actually intends to bill and when, there is far less room for later dispute.
Once work begins, time and relevant costs need to reach the matter promptly. Otherwise, the finance team is forced to reconstruct information when the bill is eventually prepared. That creates delays and increases the chance that items will be overlooked.
Why WIP can become a cashflow problem
WIP represents work the firm has carried out but has not yet converted into an invoice.
Some WIP is expected. The problem arises when it grows because matters are not reviewed or draft bills remain in approval queues.
At that point, reported activity may look healthy while cash remains tight. This is one reason profitable law firms can still experience cash pressure. The firm has earned value, but the billing process has not yet converted it into something the client can pay.
Bill approval needs a clear owner
Drafting a bill does not mean the billing process is complete.
In small firms, approval often sits with a busy partner who may also be managing client work, supervision and business development. Without a defined timetable, draft bills can remain untouched for days or weeks.
We recommend making ownership explicit. Partners should receive a concise view of bills awaiting approval, how long they have been outstanding and what action is required. That creates accountability without producing another large finance report.
In practice: one client firm — a mixed commercial and private client practice — had draft bills sitting in an approval queue for an average of 11 days before a partner even looked at them, simply because no single person owned the review. Introducing a weekly 15-minute approval slot, with a standing list of anything over five days old, cut that average to under three days within a month, with no change to the underlying billing volume.
Better billing improves more than cashflow
Prompt billing also improves the client experience.
Clients are generally better able to understand invoices when they receive them close to the work being performed. Questions can be resolved while the matter is still fresh and unexpected large bills become less likely.
Regular billing can also make credit control easier because the firm identifies payment issues earlier. By contrast, issuing one large invoice months after the work was completed can make both explanation and collection harder — and sits awkwardly against the “likely timescales for each stage” that Rule 1.5 requires the firm to have already told the client.
What the SRA Transparency Rules require, and why billing process is the practical link
The Rules set out what firms must tell clients up front. The billing process is what makes that commitment deliverable in practice, rather than an estimate the firm quietly drifts away from.
Measure how quickly work moves from WIP to cash
A good billing process should be visible through management information.
Partners should be able to see how much WIP remains unbilled, which draft bills are waiting for approval and how long invoices take to convert into cash. These measures connect billing directly to the wider financial health of the firm.
If WIP rises every month while billing remains flat, the firm needs to understand why. Likewise, growing revenue means less if debtors are increasing at the same time.
Technology should support the workflow
Systems such as Clio and Xero can support a strong billing process, but software cannot replace ownership.
Matter setup needs to be consistent. Time and expenses need to be recorded correctly. Draft bills need a clear approval route, and the accounting records should reflect the final position accurately.
Where those processes are disconnected, the technology can end up displaying the symptoms rather than solving the problem. We therefore focus first on the workflow and then on configuring systems to support it.
What good billing looks like in a small firm
A small practice does not need a complicated billing department. It needs a dependable rhythm.
Time recording should remain current, WIP should be reviewed regularly and draft bills should have defined approval deadlines. Once invoices are issued, collection responsibility should also be clear.
The process must continue when a partner is on holiday, in court or focused on a major matter. That consistency is what turns billing from a month-end scramble into a normal part of financial management.
How AM Strategic can help
At AM Strategic, we help law firms design and operate billing processes that connect WIP, Clio, Xero, collections and management reporting.
Our role is not simply to produce invoices. We help create a finance process that shows partners where work is sitting, what needs approval and how effectively billed fees are converting into cash — and that keeps the firm’s actual billing practice aligned with what it has already told clients to expect.
If delayed billing or growing WIP is putting pressure on your firm’s cashflow, book a consultation with AM Strategic to review your current process.
Frequently Asked Questions
1. What should a good law firm billing process include? It should cover matter setup, time and cost recording, WIP review, draft preparation, approval, invoice issue and collection.
2. How does the SRA Transparency Rules regime affect billing? Rule 1.5 requires firms to publish clear costs information — total cost or range, basis of charges, disbursements and likely timescales — for defined services. A billing process that cannot deliver accurate, timely invoices makes it harder to stay consistent with that published information.
3. Why do law firms build up large amounts of WIP? Common causes include late time recording, infrequent billing, delayed approvals and a lack of ownership over which matters should be billed.
4. Can better billing improve cashflow? Yes. Faster billing reduces the first part of lock-up by shortening the period between completing work and issuing the invoice.
5. Can billing be outsourced? Yes. Elements of billing administration can be outsourced, while the firm retains the appropriate responsibility and approval over its fees and client relationships.
Source: SRA Transparency Rules, Rule 1.5 (sra.org.uk).
Adam Bent is a trusted financial leadership expert with 30 years of experience helping startups and small to medium-sized businesses achieve faster growth. He guides companies to success through strategic financial planning and implementation, using his expertise to build actionable turnaround plans for businesses in financial distress.
Having seen many entrepreneurs with great ideas struggle due to a lack of financial expertise, Adam specialises in translating vision into viable, practical financial models, offering dedicated support every step of the way.
Driven by the reward of seeing businesses thrive, he founded AM Strategic Consultancy to help companies realise their full growth potential.
Adam Bent is licensed and regulated by the AAT under licence number 1005891.