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Should You Take On a New Client? A Three-Number Test

Whether to take on a new client comes down to three numbers: how many hours remain under your capacity ceiling, the effective hourly rate the proposed work implies, and what the new client would displace if the hours are not really free. If an opportunity passes all three, it is worth pursuing. If it fails any one of them, the founder is being offered revenue that will cost more than it pays, however attractive the headline fee looks.

Most founders evaluate new work on a single number: the monthly fee. A larger fee feels like a better client, and in a quiet month any fee feels like relief. But the fee alone says nothing about how many hours the work will actually take, whether those hours exist, or what else will quietly stop getting done to make room. Those are the questions that decide whether a new client makes the business stronger or simply busier.

The three checks below take about ten minutes and should be run before the proposal goes out, not after the contract is signed.

Check One: How Many Hours Are Left Under the Ceiling?

The first check is capacity. Every consultant has a capacity ceiling, the number of billable hours they can deliver in a month before quality, responsiveness, or margin starts to slip. The hours available for a new client are the difference between that ceiling and the current load, measured in hours actually worked rather than hours billed.

The distinction matters, because a roster that bills 95 hours a month may be consuming 115 once calls, revisions, and admin are counted. A founder who measures remaining capacity against billed hours will consistently overestimate how much room they have, which is how "one more client" turns into a month of evenings. How to know when you're actually full covers the signals that the ceiling has already been reached.

The test is simple: the new work's realistic hours, including its share of communication and admin, must fit inside the remaining capacity. If it does not fit, the opportunity is not a question of whether to add a client. It is a question of which existing work to replace, which is check three.

Check Two: What Effective Rate Does the Work Imply?

The second check is the rate. Divide the proposed monthly fee by the hours the work will realistically take, not the hours in the scope document. The realistic number should include the communication, revisions, and admin that similar engagements have historically required. For most consultants, that means adding 20 to 40 percent to the scoped hours.

The resulting figure is the effective hourly rate the new client will pay. Compare it against two benchmarks: the effective rate of the current roster and the minimum rate the business needs to cover owner pay, taxes, and overhead. A new client whose implied rate sits below the roster average will pull the business's overall effective rate down, even as revenue goes up. Why growth lowers profit shows how that pattern plays out across a full year.

This is the check most founders skip, because the scoped hours usually make the rate look fine. The realistic hours are what reveal the problem.

Check Three: What Would It Displace?

The third check is displacement. If the new work fits comfortably under the ceiling, it displaces nothing billable, though it will still consume the slack that currently absorbs surprises. If it does not fit, something has to give: an existing client, business development time, or the founder's evenings. Each of those has a cost.

When a new client would push out existing work, compare the fee gained against the fee lost and divide the difference by the net hours added. That incremental rate is the true price of the decision. The opportunity cost of consulting clients you should drop works through this comparison in detail, and the same logic applies in reverse when deciding whether to make room.

A Worked Decision: Two Opportunities in the Same Week

Consider a consultant with a capacity ceiling of 130 billable hours a month who is currently working 95. That leaves 35 hours open. The current roster produces an effective rate of $150 per hour, and the business needs at least $140 per hour to cover owner pay, taxes, and overhead. Two opportunities arrive in the same week.

Opportunity A is a $6,000 monthly engagement scoped at 28 hours. Similar engagements have run about 20 percent over scope once communication and admin are counted, so the realistic figure is 34 hours. Opportunity B is a $9,000 monthly engagement scoped at 50 hours. This consultant's past projects of this type have run about 40 percent over, putting the realistic figure at 70 hours.

Opportunity B has the larger fee, and on a revenue view it looks like the obvious choice. It fails the second test outright: at $129 per realistic hour, it pays less than the business needs to cover its own costs. It also fails the first test, and the third test makes the damage concrete. To fit 70 hours, the consultant would need to drop an existing client paying $5,250 for 35 hours. The net gain would be $3,750 in revenue for 35 additional hours of work, an incremental rate of about $107 per hour.

Opportunity A is smaller and passes all three checks. It adds $6,000 at $176 per hour, raising the roster's overall effective rate rather than lowering it. The one caution is that it uses nearly all remaining capacity, so any further opportunity in the next quarter would need to go through check three rather than check one.

Opportunity B is not necessarily a client to refuse forever. A version rescoped to 40 realistic hours at the same fee would imply $225 per hour and would change the answer entirely. The test does not reject large clients. It rejects work priced below what it will actually cost to deliver.

How Do I Know If a Client Is Worth Taking On?

A client is worth taking on when the realistic hours fit under the remaining capacity, the implied effective rate clears both the minimum the business needs and the current roster average, and the work does not displace a better-paying relationship. Fit, rate, and displacement, in that order. Everything else about the opportunity, including how much the founder likes the client or how prestigious the work is, is a tiebreaker to apply once the numbers pass.

Once a client is on the roster, the same numbers keep working. How to rank clients by profitability extends the effective rate comparison across every active relationship, which is the basis for deciding where the next hour of capacity should go.

Running the Numbers Before the Proposal

The inputs for all three checks are the same ones a founder needs to run the business well in general: current hours worked per client, current effective rate per client, and a realistic estimate of how far similar work has run over its scope. How to calculate revenue capacity shows how those inputs combine into the business's overall ceiling.

The Rate Reality Calculator shows the effective rate for every current client and for the roster as a whole, which gives the baseline that each new opportunity has to beat. It also tracks absorbed scope by client and by month, which is the history needed to estimate how far a new engagement will run over its scoped hours. $39 one-time.

Frequently Asked Questions

Should I take on a new client if I am already busy?

Only if the new work's realistic hours fit under your capacity ceiling or it pays a higher effective rate than the work it would displace. If taking the client means dropping an existing relationship, compare the fee gained against the fee lost and divide by the net hours added to find the true incremental rate.

How do you evaluate whether a consulting client is worth it?

Run three checks: whether the realistic hours fit under your remaining capacity, whether the implied effective hourly rate clears your minimum and your roster average, and what existing work the client would displace. A client that passes all three strengthens the business.

How do you calculate the effective rate of a new client before signing?

Divide the proposed monthly fee by the realistic monthly hours, which are the scoped hours plus the communication, revision, and admin time similar engagements have historically required. For most consultants that adds 20 to 40 percent to the scoped hours.

When should a consultant say no to a new client?

A consultant should decline or rescope when the implied effective rate falls below the minimum the business needs, when the work does not fit under the capacity ceiling without displacing a better-paying client, or when the realistic hours are far higher than the scope suggests.

Related reading

Know the rate every opportunity has to beat with the Rate Reality Calculator. $39 one-time, six inputs per client.

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