How do I know which clients or engagements are actually worth keeping?

The answer usually lives in one number: true margin per engagement after all delivery costs, including your own time at what it’s actually worth.

Most professional service firms operate with a sense of which clients feel good and which feel hard. Revenue tells part of the story. But revenue without cost attribution is misleading. A client paying $8,000 a month looks healthy until you realize they consume 40 hours of senior time that could bill at $200 elsewhere.

Start by calculating what each engagement actually costs to deliver. Direct costs are straightforward: staff time, subcontractors, software, materials passed through. The harder part is allocating overhead reasonably and, most importantly, valuing your own time honestly.

Owner time is where the math usually breaks down. Many firm owners don’t track their hours by client, or they value their time at zero because they’re not “paying themselves that much anyway.” This is a mistake. Your time has a replacement cost. If you had to hire someone to do what you do on that engagement, what would it cost? That number belongs in the calculation.

When firms do this analysis honestly, a familiar pattern emerges. A small group of clients generate most of the profit. Another group breaks even or slightly positive. And a few relationships that felt normal turn out to be quietly consuming the firm. They pay, but they pay less than the cost of serving them when you count everything.

For consultants and agencies especially, this analysis often reveals that older clients paying legacy rates are the problem. Loyalty kept the price flat while your costs grew. The relationship is fine. The price is just wrong for who you are now.

The real value of this work is making the pruning conversation factual instead of emotional. Raising a client’s price or ending a relationship is hard when it’s based on feelings. It’s much easier when you can point to the numbers: this engagement costs us more to deliver than we receive.

This kind of visibility requires books structured to show profitability by client or engagement type. Accrual accounting with class or project tracking makes the margin visible. Fractional CFO services layer on the analysis, helping you understand what the numbers mean and how to act on them.

Once you’ve done the exercise, build the tracking into your ongoing accounting. Reviewing margin by client quarterly keeps you honest and lets you spot drift before it becomes a problem.

If you’d like help building this visibility into your books or working through the analysis, schedule a consultation with Kai Crest.