Lifetime Client Profit Calculator
Understand the true profit per client after labour efficiency, payment terms, and over a full client lifetime.
1. Firm Settings
Employer NIC, pension, etc.
Your firm’s floor ratio
Net profit margin goal
Expected retention in years
2. Client Revenue & Margin
Total annual fees billed to this client
Revenue minus direct costs as a %
3. Labour Efficiency Ratio
How efficiently does revenue convert to gross profit relative to staff cost? Higher is better.
4. Payment Terms
Using your target profit margin (20%) as the opportunity cost. Every pound tied up in a slow-paying client is a pound not earning 20% inside your business. This is the honest rate for an SME owner — what the capital actually costs you in forgone profit.
Average days to payment from invoice
Your agreed or ideal terms
LER Analysis
Payment Terms Cost
True Client Profit
Annual profit after labour & payment costs —Lifetime Client Value
Total profit over client lifetime —How True Lifetime Client Profit (LCP) Is Calculated
Standard accounting measures client profitability by deducting direct third-party expenses from billed revenue. However, true commercial profitability must account for internal delivery friction and debtor funding drag:
The Lifetime Client Profit Equation:
True Annual Client Profit = (Annual Fee Revenue * Gross Margin %) – (Delivery Staff Cost / LER Factor) – Payment Terms Opportunity Cost
Total Lifetime Client Profit = True Annual Client Profit * Expected Client Lifetime (Years)
Key Components Explained:
- Delivery Staff Cost & Oncosts: Direct employee compensation must include true employer oncosts (Employer National Insurance, pension contributions, and benefits—typically 15% to 20% above base salary).
- Labour Efficiency Ratio (LER): Reflects how demanding a client is. High-touch clients who trigger endless revisions, disorganized meetings, and out-of-scope requests lower delivery LER, consuming disproportionate staff capacity.
- Opportunity Cost of Payment Terms: When a client takes 60 or 90 days to settle invoices, your working capital is trapped. If your firm targets a 20% net margin, every £10,000 tied up in overdue receivables represents an annual opportunity cost of £2,000 that cannot be deployed for growth.
- Retention Horizon: Extending client retention from 2 to 4 years doubles lifetime commercial profit without incurring additional marketing or acquisition spend (CAC).
4 Practical Strategies to Maximize Lifetime Client Profitability
Once you calculate the true lifetime profit of your client portfolio, clear patterns emerge. Apply these four commercial strategies to elevate overall firm margin:
1. Classify Accounts by Delivery Friction (The LER Audit):
- 1.0x to 1.5x LER (Painful / High-Touch): Clients who demand constant firefighting, erode staff morale, and generate sub-par margins. These accounts require immediate scope tightening or contract repricing.
- 2.0x LER (Benchmark): Standard accounts operating smoothly within agreed project parameters.
- 2.5x to 3.0x+ LER (Frictionless / Dream Clients): Autonomous, decisive clients who respect delivery boundaries and generate superior margins. Focus account management on retention and expansion.
2. Enforce Strict Payment Terms to Eliminate Working Capital Drag:
Transition clients from 30-day or 60-day invoice arrears to upfront direct debits (e.g., GoCardless) or monthly automated credit card billing. Eliminating debtor days recovers substantial opportunity cost and secures positive operating cash flow.
3. Price for Value Rather Than Billable Hours:
Hourly billing caps client profitability to time spent. Value-based pricing or structured monthly advisory retainers reward delivery efficiency, naturally lifting your effective hourly realization and LER.
4. Establish Clear Client Offboarding & Repricing Triggers:
If a legacy client refuses scope boundaries or annual inflationary fee adjustments, offboarding them frees critical team capacity to onboard higher-margin, frictionless clients.
Frequently Asked Questions About Client Lifetime Profit
What is the difference between Customer Lifetime Value (CLV) and Lifetime Client Profit (LCP)?
Why does client payment speed affect lifetime profit calculations?
How can we calculate our firm's baseline Labour Efficiency Ratio?
What should an agency do when a major client has a low LER?
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