A 13-Week Cashflow Forecast for Law Firms gives owners a practical view of the firm’s expected cash position over the next three months.
Unlike historical financial reports, it looks forward.
It helps answer a simple but important question:
👉 Will we have enough cash to meet our commitments over the next 13 weeks?
For growing law firms, that visibility can make a significant difference.
What is a 13-Week Cashflow Forecast for Law Firms?
A 13-Week Cashflow Forecast for Law Firms projects the firm’s expected cash receipts and payments week by week.
The forecast normally starts with the firm’s current cash position.
It then considers expected:
Cash coming in:
✅ Client invoice receipts
✅ Bank Interest
✅ Disbursements
✅ Other income
Cash going out:
✅ Payroll, PAYE and National Insurance
✅ VAT
✅ Suppliers
✅ Rent and premises costs
✅ PII
✅ Tax liabilities
✅ Loan repayments
✅ Budgeted expenditure
The result is a rolling view of the firm’s expected cash balance.
Why 13 weeks?
Why 13 weeks rather than 12?
Because 13 weeks gives roughly one quarter of forward visibility while still being detailed enough to manage on a weekly basis.
That makes it particularly useful for short-term financial management.
Owners can see:
🔎 What cash is expected next week
🔎 What payments are approaching
🔎 When cash may become tight
🔎 Whether planned expenditure is affordable
🔎 How the position changes over the coming quarter
The 13-Week Cashflow Forecast for Law Firms turns the future cash position into something that can be actively managed.
What goes into a 13-Week Cashflow Forecast for Law Firms?
The quality of the forecast depends heavily on the assumptions behind it.
For cash coming in, owners may need to consider:
✅ Current aged debt
✅ Expected collection dates
✅ Historic payment behaviour
✅ WIP likely to be billed
✅ Major matters approaching completion
✅ Expected new business
For cash going out, the forecast should reflect known commitments and realistic expectations.
That might include:
✅ Payroll
✅ Employer National Insurance and pensions
✅ VAT
✅ Tax
✅ Regular overheads
✅ Recruitment costs
✅ Capital expenditure
✅ One-off payments
A 13-Week Cashflow Forecast for Law Firms is only as useful as the assumptions behind it.
WIP and Aged Debt matter
A law firm’s cashflow cannot be separated from its working capital.
Suppose a firm has significant WIP.
That may represent valuable future income.
But until the work is billed and collected, it has not become cash in the bank.
The same applies to aged debt.
A large debtor balance may look positive from a revenue perspective.
But if clients are slow to pay, the cash is still unavailable.
This is why a 13-Week Cashflow Forecast for Law Firms should be considered alongside WIP, aged debt and lock-up.
What can a 13-Week Cashflow Forecast for Law Firms be used for?
A rolling 13-week forecast can help owners make practical decisions.
For example:
Can we afford to recruit?
The forecast can show the effect of additional payroll and associated costs.
Can we commit to a major purchase?
The forecast can show what happens to liquidity if the expenditure is made now.
Can we manage an upcoming tax or VAT payment?
The forecast can highlight the expected cash position when the payment falls due.
Do we need to accelerate collections?
If cash is tightening, the forecast can highlight the need to focus on outstanding debt.
👉 It gives owners information before the decision needs to be made.
Keep it rolling
The real value comes from keeping the forecast rolling.
As each week passes:
Actual results replace forecasts.
A new week or month is then added at the end.
This means the firm continually has approximately 13 weeks of forward visibility.
At Moore Financial Management, this approach can also be extended to:
✅ 13-week forecasts
✅ 26-week forecasts
✅ 52-week forecasts
The appropriate timeframe depends on what the firm needs to manage.
What if things don’t go to plan?
A forecast shouldn’t assume that everything will happen exactly as expected.
Owners can consider different scenarios.
For example:
Base case:
Expected collections and expenditure.
Downside case:
Collections are slower than expected.
Growth case:
Additional recruitment or investment takes place.
This can help answer:
👉 What happens to our cash if our assumptions change?
That is often more useful than simply looking at one set of numbers.
The bigger picture
A 13-Week Cashflow Forecast for Law Firms is not intended to replace management accounts.
The two provide different information.
Management Accounts help owners understand profitability, performance and trends.
Cashflow Forecasting helps owners understand future liquidity.
Lock-Up and aged debt analysis help explain where cash may be tied up.
Together, they provide a much clearer financial picture.
Key Takeaways
👉 A 13-Week Cashflow Forecast for Law Firms provides weekly visibility of future cash.
👉 It looks approximately one quarter ahead.
👉 WIP and aged debt can have a significant impact on future cash.
👉 Payroll, VAT, tax and other major commitments should be included.
👉 Rolling forecasts provide continually updated visibility.
👉 Scenario planning can show what happens when assumptions change.
👉 The real benefit is giving owners time to act before cashflow pressure becomes a problem.
Continue the Series
This guide is part of the Law Firm Financial Management Series, exploring the key financial concepts every law firm owner should understand.
Next:
How to Forecast Cashflow in a Law Firm
