Most firm dashboards measure activity, not outcomes. They tell you how busy you are, not how profitable you will be in six months. After looking at the management accounts of dozens of UK accounting firms, eight metrics consistently separate the firms that are quietly growing margin from the ones that look busy and feel poor.
1. Lockup days (WIP + debtors / revenue × 365)
Lockup measures how long it takes from doing work to receiving cash. Healthy mid-tier UK firms run at 60-80 lockup days. Above 100 and your working capital is funding clients. The metric matters more than any vanity revenue figure because it predicts cash crises.
Track it monthly, by partner. Partners with consistently high lockup are either undervaluing their work, struggling to push WIP through to invoice, or carrying clients they should have fired.
2. Realisation rate
Realisation is the percentage of WIP you actually bill. If a job carried £8,000 of time and you invoice £6,400, realisation is 80%. Below 85% across the firm and you have a pricing, scoping, or efficiency problem. Above 100% (which happens on fixed-fee work delivered under budget) and you may be underservicing.
Realisation drift downward is the classic silent killer. A two-point annual drop, compounded over five years, takes a firm from healthy to marginal without anyone noticing.
3. Gross margin per client segment
Forget firm-wide margin. Slice by client type: limited company year-ends, sole trader tax returns, advisory, audit, payroll. Almost every firm discovers one segment is subsidising another. The temptation is to defend the loss-leader because it generates volume; the discipline is to either reprice it or stop offering it.
4. Revenue per partner
Total fee income divided by full-equity-partner count is the single best benchmark against the market. UK firms in the £1-5m bracket typically run at £600-900k per partner. Below £500k per partner suggests either undersized portfolios, weak leverage from staff, or surplus equity partners. Above £1m per partner often signals understaffing and burnout risk.
5. Leverage ratio (staff to partner)
How many fee earners does each equity partner support? The right number depends on practice mix - audit firms run higher leverage than tax-advisory boutiques - but the trend matters more than the absolute number. Leverage declining year on year usually means partners are doing work that staff should be doing, which collapses profitability.
6. Free capacity over a 13-week horizon
Most firms know last month's utilisation. Far fewer know how much sellable capacity they have in the next 90 days. A rolling 13-week capacity view tells you whether to push for new work, redirect marketing spend, or pause hiring. Practice-management platforms like Accupe surface this directly from time bookings and job pipelines.
7. Client concentration
What share of your fees comes from your top ten clients? Above 35% and you have material concentration risk. One departure can wipe out a partner's portfolio. Track it quarterly. When the number creeps up, prioritise new-client acquisition in the segments where you are over-concentrated.
8. Net Promoter Score from clients
The only forward-looking metric on this list. NPS predicts referral volume, retention, and the willingness of clients to accept fee increases. Firms with NPS above 50 typically grow organically; below 20 they bleed clients quietly. Survey every client once a year. Two questions: would you recommend us, and why.
What to stop tracking
Three commonly-reported metrics tell you almost nothing useful: total chargeable hours (rewards bums-on-seats over outcomes), gross revenue growth (can be entirely vanity if margins collapse), and staff utilisation as a single firm-wide number (averages away the partner-grade bottleneck that actually matters).
Build a single page
These eight metrics fit on a single sheet of A4. Print it, review it monthly with the management committee, and act on the outliers. A KPI report that nobody can read in two minutes does not get used. The point is not the dashboard - it is the conversation it forces.
Closing
Profitability in an accounting firm is built quietly through small disciplines: priced jobs delivered under budget, invoiced promptly, paid on time, by leveraged teams with low concentration risk. The eight KPIs above are the early warning system. Look at them. Then do something.