The Right Way to Report Cost Per Case to a PI Managing Partner

Cost per case is the single most important metric in PI marketing. It connects marketing spend directly to business outcomes in a language every managing partner understands: what does a case cost us to acquire, and is that a good investment?

But knowing your cost per case is different from communicating it effectively. A lot of marketing directors have the data and still struggle to use it in leadership conversations because they're not sure how to present it, what context to add, or how to connect it to the decisions they're recommending.

This article covers the right way to report cost per case to a PI managing partner — including how to calculate it correctly, how to present it clearly, and what comparisons make it most useful.

Why Cost Per Case Is the Right Metric

Most PI firms report on cost per lead. Their vendors send invoices, the lead counts are tracked, and the division is straightforward. But cost per lead answers the wrong question. It tells you what you paid for a contact, not what you paid for a client.

Two vendors can have an identical cost per lead of $150 and produce dramatically different cost per case results:

• Vendor A: 100 leads at $150 each = $15,000. 10 signed cases. Cost per case: $1,500.
• Vendor B: 100 leads at $150 each = $15,000. 3 signed cases. Cost per case: $5,000.

A managing partner looking at cost per lead sees two identical vendors. A managing partner looking at cost per case sees one vendor that produces cases at a third of the cost of the other. That's the difference a single metric makes in a budget conversation.

How to Calculate Cost Per Case Correctly

The formula is straightforward: total marketing spend divided by total signed cases over the same period. But the implementation has several nuances worth understanding before you present the number.

Use a 90-Day Window for Vendor-Level Calculations

At the vendor level, monthly signed case volumes can be lumpy. A vendor might produce 2 signed cases one month and 8 the next depending on lead quality variance, intake scheduling, and a dozen other factors. A 90-day rolling window smooths that volatility and gives a more accurate picture of vendor performance.

Example: Vendor C spent $120,000 over three months. 28 cases were signed from their leads. Cost per case: $4,286. That number is much more meaningful than any single month's calculation.

Track the Attribution Window Clearly

Your cost per case calculation depends on when you count a case as “signed.” If you count cases at the point of signing (which is correct), make sure the marketing spend in your denominator reflects the period when those leads were generated — not when they signed. Lead-to-sign timelines of 2 to 6 weeks mean your March spend may be producing April and May cases.

The simplest approach for managing partner reporting: report cost per case based on spend and cases in the same calendar period, and note that a more precise calculation would account for the lead-to-sign lag. For most firms, the calendar period approximation is accurate enough for strategic decisions.

Separate Fully Loaded Cost Per Case from Direct Spend

Direct spend per case is lead cost divided by cases signed. Fully loaded cost per case includes marketing staff time, technology, and overhead. Both numbers have a place in your reporting:

• Direct cost per case is the right metric for evaluating vendor performance.
• Fully loaded cost per case is the right metric for CFO-level or managing partner conversations about overall marketing efficiency.

Be explicit about which number you're presenting. “Our cost per signed case from paid lead vendors averaged $3,800 in Q1” is a different statement than “our fully loaded cost per case — including staff and technology — averaged $5,200.” Both are true and useful. Conflating them creates confusion.

How to Frame Cost Per Case for Leadership

The number by itself is useful. The number in context is powerful. Here are the three frames that make cost per case most useful in a managing partner conversation:

Frame 1: Against Your Firm's Own Threshold

Every PI firm has — or should have — a maximum acceptable cost per case. This threshold is typically derived from average case value. If your average case settles for $45,000 and your contingency fee is 33%, your average case generates approximately $15,000 in attorney fees. A cost per case of $5,000 represents roughly 33% of fee revenue going to acquisition — which may or may not be acceptable depending on your firm's economics.

Once you establish a threshold, every vendor evaluation becomes binary: are they above or below it? Present it that way. “Our cost per case threshold is $5,000. Vendors A, B, and E are below threshold. Vendor C and D are above. Here's what I recommend.”

Frame 2: Against Prior Periods

Is cost per case improving or deteriorating? Trend is more useful than any single data point. When you can show that firm-wide cost per case went from $4,800 in Q3 to $4,100 in Q4, you're showing a 15% improvement in marketing efficiency. That's a number a managing partner can connect to business outcomes.

Show a 6-month or 12-month trend line in your quarterly reviews. It demonstrates that your marketing decisions are having a compounding effect — and that the investment in tracking and optimization is producing measurable returns.

Frame 3: Relative to Case Value

Cost per case becomes most powerful when it's shown in relation to case value. If your average case value is $45,000 and your cost per case is $3,800, your acquisition cost ratio is 8.4%. That means for every dollar in case value, you're spending 8.4 cents on acquisition.

This framing resonates with managing partners because it mirrors how they think about business efficiency. It's not just “is this number good?” — it's “how does this compare to what the investment produces?”

Note: connecting cost per case to case value requires settlement data, which has a 6 to 18 month lag. The firms that have been tracking attribution from lead to settlement can have this conversation. Firms that haven't built that infrastructure yet can still use average case value estimates from historical data.

The Conversation to Avoid

The most common mistake in reporting cost per case to leadership is presenting it defensively. When a managing partner asks “why is Vendor X costing us $7,000 per case?” the wrong response is a list of reasons why that number isn't really that high.

The right response: “It is that high. Here's what I'm doing about it.” Then present your recommendation — reduce budget, pause the vendor, have a performance conversation, or set a 60-day improvement window.

Managing partners trust marketing directors who own their data, even when the data isn't flattering. They lose trust in marketing directors who explain away bad numbers.

What Good Reporting Infrastructure Looks Like

Reporting cost per case accurately requires connected data. Marketing spend lives in vendor invoices and payment systems. Signed cases live in your case management software or CRM. Attribution — which lead became which case — lives somewhere in between, and tracking it is where most PI firms break down.

Firms using a revenue intelligence platform like RevenueScale track cost per case in real time, by vendor, without monthly reconciliation exercises. The number is always current. Vendor comparisons are always available. And when a managing partner asks “what's our cost per case right now?” — there's an answer.

Firms doing this manually spend 10 to 15 hours per month to produce a number that's already three weeks old by the time the report goes out. That's not the foundation for the cost-per-case conversations that actually change how budget gets allocated.

RevenueScale's real-time cost per case reporting gives managing partners the exact view they need — by vendor, by time period, updated continuously without a monthly reconciliation exercise.