If a single client makes up a big slice of your accounts receivable, your cash risk is concentrated—even if realization looks fine and billings are on plan. Most firms don’t see the exposure until a payment delay or dispute hits cash. This post outlines how to spot client concentration risk in AR and how FirmMetrics makes it visible without waiting for month-end.
Why client concentration in AR matters
AR tells you more than “who owes what.” It reveals how dependent your cash position is on a small set of clients. When one client carries too much of your total AR, any delay, dispute, or write-off from that client injects disproportionate risk into cash flow and partner distributions. The danger is often invisible inside summary-level AR aging—until it isn’t.
Healthy firms typically aim to keep any single client from representing more than 20% of total AR, with 25%+ a clear risk threshold. That threshold exists for a reason: a single large account can swing your DSO, your 90+ day bucket, and your write-off rate in ways that annual averages won’t flag soon enough.
How to measure concentration—consistently
Measuring concentration is simple to define but easy to misread when it’s buried in spreadsheets. The question is: what share of total AR does your top client (and top 3–5 clients) represent right now?
- Single-client share of total AR: Keep any one client below 20%; 25%+ is a risk signal.
- 90+ day bucket share: Aim to keep the 90+ day bucket under 15% of total AR; over 20% is a warning.
- Days Sales Outstanding (DSO): Target under 45 days; above 60 days is a risk signal.
- AR write-off rate: Target under 2% annually; above 3–4% is a concern.
These are general benchmark ranges, not promises for any specific firm. The point is trend and mix: if the top-client share is climbing, the 90+ day bucket is creeping up, and DSO is drifting higher, risk is concentrating—even when total AR hasn’t spiked.
Patterns that quietly increase cash risk
Concentration rarely spikes overnight. It builds through operational patterns partners can miss:
- Uneven invoicing cadence: Work completes, invoices lag, and a single large account accumulates balance faster than peers.
- Service line mix shift: One service line bills on longer cycles, skewing AR toward a few big clients.
- Negotiated terms “just this once”: Extended terms granted to a marquee client turn into the new normal, elongating DSO.
- Dispute-driven stalls: A small number of disputed invoices sits unresolved, pushing a large client into the 90+ day bucket.
None of these show up cleanly in a static AR report. You need a connected view that ties client balances, invoice timing, and service-line billing patterns into the same line of sight—and explains the why, not just the what.
How FirmMetrics makes AR concentration visible
FirmMetrics consolidates AR, billing, and productivity data directly from CCH Practice or Practice CS into standardized, automatically updating dashboards. It tracks AR aging, billing velocity, and client-level performance without manual exports or spreadsheet reconciliation. Where it goes further is context:
- Client concentration indicators: Clear visuals of the top client’s share of total AR and the combined share of the top clients, updated as data refreshes.
- AI explanations of shifts: Plain-language summaries of why concentration moved—whether invoice timing slipped, a large invoice aged into a new bucket, or a service line changed billing cadence.
- Billing velocity monitoring: Visibility into invoice lag (healthy cadence is 0–14 days from work completion; beyond 30 days is a risk signal) so you can see if slow billing is amplifying concentration.
- Early warning for aging buckets: Tracking the 90+ day share against a healthy under-15% target, with alerts when a single client dominates that bucket.
Because FirmMetrics brings financial and operational data into one view, partners can see when a workload or service-line shift is driving the AR mix—not just the outcome in aging. The result is a faster path from “we might have a cash exposure” to specific actions by client, service line, and invoice stage.
From risk signal to action—what to do next
Once you see concentration rising, act deliberately. The goal isn’t to “fire the big client.” It’s to de-risk your cash position with a series of practical moves.
- Stabilize invoice cadence: Tighten billing velocity toward the 0–14 day target. Break large deliverables into staged invoices if it keeps cash moving.
- Escalate stalled items: Focus on disputes and any invoice approaching the 90+ day threshold. A single resolution can reduce both the top-client share and the 90+ bucket at once.
- Align terms with risk: If concentration is unavoidable during a project, adjust terms (e.g., deposits, milestone billing) to align cash timing with work delivered.
- Diversify work mix: If one service line tends to create slow-paying AR, balance the portfolio with engagements that bill and collect faster.
- Close the loop with operations: Use FirmMetrics’ AI explanations to identify whether process delays (review, approval, client info) are driving invoice lag, and fix the root cause—not just the symptom.
Each of these steps is easier when your AR, billing, and operational signals are in one standardized, reliable view. That’s the difference between reporting what happened and managing the risk before it turns into a cash crunch.
What this means for your firm
Averages hide concentration. A healthy overall DSO can still mask a single client carrying too much of your AR. With FirmMetrics, partners and finance leaders get real-time visibility into client-level AR exposure, benchmark-aligned targets, and AI explanations that translate movement into action. That combination turns concentration from a surprise into a managed risk, so cash stays predictable and partner decisions stay confident.
If you’re still reconciling AR by spreadsheet and finding issues at month-end, you’re reacting too late. Bring the client concentration question into your weekly rhythm—and give your team a single source of truth that answers it the same way, every time.