Cash flow management for small law firms.

At a small firm, cash flow problems usually don't look like cash flow problems. They look like “a slow billing month,” “a couple of late payers,” and “the partners' drawings need a delay this time.” The pattern is harder to see than the symptoms, and most firms only notice it when the bank balance dips below where it should be.

The fix is unglamorous: a forward-looking cash forecast that's updated weekly, a small number of collection levers used deliberately, and a defined set of early-warning signals that get acted on before they're emergencies.

The cycle: WIP → bill → collect → close

Before any forecasting, the operator's job is to know the firm's actual cycle:

• WIP age: how long, on average, between time being recorded and time being billed. Two weeks is tight. Four to six is typical. More than eight is dangerous.
• Days to invoice from work completion: how long after a billable phase finishes does the bill actually go out? Most leakage hides here (see reducing billing leakage ).
• Debtor days: from invoice issued to cash received. Realistic: 30–45 days for most small-firm matter types; 60+ for some commercial work; 90+ usually means a collection problem, not a payment-terms problem.
• Cycle total: the sum of the three above. For most small firms running on hourly billing, 90–120 days from work-done to cash-collected is normal. The aspirational target is 60–75.

Knowing those four numbers alone — even before any forecasting — surfaces where the trapped cash is. Most firms are surprised by the answer, usually by the WIP age.

The 13-week cash forecast

13 weeks because it's long enough to see the lumps coming (quarterly tax bill, partner drawings, an annual software renewal) and short enough to be predictable. Yearly forecasts are aspirational; weekly forecasts are operational; 13-week forecasts are the right grain for a small firm.

The structure (one sheet)

Columns: weeks 1–13. Rows in three groups:

• Cash in: by category — fees collected, retainers received, disbursement recoveries, other. Predict by week based on outstanding bills and known payment patterns of clients.
• Cash out: payroll, partner drawings, rent, tax, software, professional indemnity, other. Most of these are fixed or known well in advance.
• Net + balance: cash in minus cash out per week, running bank balance, with a low-water-mark row that shows the lowest projected balance in the period.

The weekly update

Same person, same time each week — usually Friday morning, practice manager or finance lead. Three updates:

1. Drop the actuals for the week just past (cash in, cash out, closing balance) into the historical column.
2. Roll the 13-week window forward — week 1 closes, week 14 opens.
3. Update predictions: any new bills issued this week, any actual collection news, any change to known cash-out items. The forecast is wrong if it's not updated weekly.

The Friday review with partners

Five minutes, not a meeting. The forecast lands in their inbox or on the wall. The single number that matters: the low-water-mark balance over the next 13 weeks. If it's comfortably above the firm's minimum operating reserve, no action. If it dips below, action this week — covered in the levers section below.

The collection levers that actually work

Most small firms have one collection mode (“send statements at month-end”) and react when it's not working. The firms with healthy cash flow run a defined sequence:

Lever 1: bill faster

The cheapest cash-flow improvement is reducing WIP age. If time recorded in week 1 is being billed in week 5, that's four weeks of free working capital you're providing the client. Move bills to fortnightly or weekly issuance for regular matters; bill at clearly-defined milestones for project work. Most clients prefer regular smaller bills to infrequent large surprises.

Lever 2: shorten payment terms (deliberately)

Default 30-day terms drift to 45-day payment in practice. 14-day terms drift to 21–28-day payment. Smaller terms shift the actual collection curve forward by a real amount. The trade-off: some clients push back on shorter terms, and for high-value commercial work this can cost you the engagement. Used selectively on small matters and with clear written terms, it works.

Lever 3: payment up-front for certain matter types

Conveyancing disbursements, fixed-fee will drafting, some family work — paid in full or partly up-front. The client's emotional stage at the start of a matter is when they're most willing to pay; six weeks in, less so. Build the up-front payment into the engagement letter as standard, not an exception you have to negotiate.

Lever 4: structured chasing

A defined cadence after invoice — auto-reminder at +14 days, named follow-up at +30, partner contact at +45, formal letter at +60. The point isn't the threats; the point is consistency. Clients learn that your firm doesn't let bills age silently, and most of them adjust their payment behaviour without anyone needing to escalate.

Lever 5: stop new work for serious non-payers

The hardest lever. If a client is materially overdue on existing bills, taking new work from them is lending them more money on the same terms. Most firms hesitate (relationship, future work, hope). The firms with healthy cash flow are the ones that have a clear policy and apply it.

The relationship to billing leakage

Cash flow and billing leakage are the same problem viewed from different angles. Leakage is what you never billed for; cash flow is the timing of what you did bill for. Both are measured against the same baseline (recorded time), and both are improved by the same disciplines — prompt time entry, prompt billing, structured collection.

Run the firm's last twelve months through the Billing Leakage Calculatoralongside the cash forecast — the leakage view tells you where you're losing fees you should have collected; the cash view tells you when the fees you're collecting will land.

The early warning signals

Five signals to watch monthly. Any one of them on its own is noise; two of them together is reason to tighten the cash forecast and act on the levers above.

• Rising WIP without rising billings. Work being done isn't being billed. Capacity for more work, but cash drying up.
• Lengthening debtor days. Average days from invoice to payment creeping up. Often a leading indicator of a sector-wide tightening, sometimes a single large client paying late.
• A growing “90+ days” bucket on the aged debtor report.Bills that have been unpaid for over three months rarely get collected without intervention; they're effectively provisions, not assets.
• Partner drawings being delayed or adjusted.If drawings are flexible because the cash isn't there, the cash flow problem is already real.
• Low-water-mark dipping below operating reserve. The 13-week forecast surfacing a projected balance below your minimum. Even if you have buffer, this is the number to act on.

The reserve question

Every small firm should have a written minimum operating reserve — typically two to three months of fixed cash outgoings (payroll + rent + insurance + tax + essential software). Below this, the firm's decisions get worse because they're anchored to short-term cash needs rather than long-term value.

Above the minimum: don't hoard. Excess cash sitting idle in a current account is being eroded by inflation. The disciplined version: a small interest-earning reserve account (or short-term deposit) for cash above the minimum, with a clear policy for how partners draw the balance.

What good looks like at month six

A 13-week forecast that's updated weekly without drama and that the partners actually look at. A documented collection sequence that runs on its own. Debtor days and WIP age both trending down, even by a small amount. The conversation about partner drawings anchored in the forecast, not in feel. And — the underrated bit — the firm having more options because the cash isn't a constraint on every decision.

Cash flow management isn't glamorous, but it's the operational discipline that lets all the other operational disciplines actually run.