Cost Per Signed Case vs. Cost Per Settled Case: Why the Difference Matters for PI Firms

When most PI firms say “cost per case,” they mean cost per signed case — total marketing spend divided by retainers signed. It is fast to calculate, easy to report, and genuinely useful.

But signing a case is not the same as settling one. That gap — which spans 6 to 18 months on average — is where vendor rankings can completely invert and budget decisions quietly go wrong.

Cost per settled case divides that same spend by cases that actually resolve and generate revenue. Not activity. Outcomes. And the difference between the two numbers is not semantic — it is the difference between measuring what you acquire and measuring what you earn.

What Cost Per Signed Case Measures

Cost per signed case is straightforward. Take your total marketing spend for a given period and divide it by the number of cases that signed retainers during that period.

This metric earns its place. It tells you what a client costs to bring through the door, lets you compare vendor acquisition efficiency, and gives intake a benchmark to work against. Because the data arrives within days or weeks of the spend, it is actionable in near-real time.

The problem is what it cannot see.

What Cost Per Settled Case Measures

Cost per settled case takes the same marketing spend and divides it by the number of cases that reach a resolution — settlement, verdict, or other disposition that generates revenue for the firm.

That $947 gap represents the cost of attrition. Cases that sign but never settle — due to withdrawal, dismissal, client non-cooperation, or liability issues — still consumed marketing budget to acquire. Cost per settled case accounts for that loss.

Why the Gap Between Them Matters

A 24% gap between signed and settled cost is common at PI firms. But the size of that gap varies dramatically by lead source — and that variation is where the real strategic insight lives.

On cost per signed case, Vendor A looks $700 cheaper. On cost per settled case, Vendor B is actually $111 cheaper — and produces cases far more likely to generate revenue.

Budget decisions made on signed-case cost alone systematically over-invest in vendors whose cases look strong at intake but fall apart before settlement.

The Settlement Lag Problem

Most firms skip cost per settled case for a simple reason: the data takes too long to arrive. PI cases typically settle 6 to 18 months after signing — sometimes longer. By the time a case closes, the link to the original lead source has often been lost entirely.

That creates a structural blind spot. Firms optimize for the metric they can see quickly. But they are optimizing for the wrong endpoint — signing, not settling.

Revenue intelligence platforms solve this by holding the attribution thread across the full case lifecycle. When a case signs in January and settles in October, the vendor who generated that lead gets credit — or blame — for the outcome. Not just for the intake event.

How Attrition Rates Distort Vendor Rankings

Attrition does not hit all lead sources equally. High-quality vendors generate pre-qualified leads whose cases sign and settle at strong rates. Volume vendors generate retainers — but a significant percentage of those cases never produce revenue.

Here is what that looks like across a five-vendor portfolio:

On cost per signed case alone, Vendor E looks like the best buy at $2,200. But with a 40% attrition rate, their cost per settled case rises to $3,667 — and their average settlement value is the lowest in the portfolio. Vendor D, by contrast, carries the highest cost per signed case at $3,600. But with only 8% attrition and $45,000 average settlements, their return on acquisition cost is dramatically stronger.

Cost per signed case says give Vendor E more budget. Cost per settled case — combined with settlement value — says give Vendor D more budget. Those are opposite decisions.

Adding Settlement Value: The Complete Picture

Cost per settled case is the middle metric in a three-part framework:

1. Cost per signed case — what it costs to acquire a retainer. Useful for intake-level decisions and short-term vendor comparison.
2. Cost per settled case — what it costs to produce a revenue-generating outcome. Accounts for attrition and reveals true acquisition efficiency.
3. Acquisition cost ratio — cost per settled case divided by average settlement value. The ultimate measure of marketing efficiency relative to revenue generated.

Together, all three give you a complete picture. A high cost per settled case does not disqualify a vendor whose cases settle at 3x the portfolio average. And a low cost per settled case does not validate a vendor whose settlements sit below your break-even threshold.

How to Start Tracking Cost Per Settled Case

If your firm currently tracks cost per signed case but not cost per settled case, here is how to bridge the gap:

What Changes When You Track Both Metrics

The Metric Framework

Think of it as a progression:

• Level 1: Cost per lead — useful but misleading without conversion context.
• Level 2: Cost per signed case — better, but blind to attrition and settlement outcomes.
• Level 3: Cost per settled case — the first metric that connects marketing spend to actual revenue generation.
• Level 4: Acquisition cost ratio — cost per settled case as a percentage of settlement value. The complete financial picture.

Most PI firms are operating at Level 1 or Level 2. Moving to Level 3 is where the financial discipline of marketing attribution begins — and where RevenueScale's Financial Intelligence layer delivers the most immediate impact.

RevenueScale's settlement attribution layer tracks your true cost per settled case by vendor — giving you the full three-metric framework of cost per signed case, cost per settled case, and acquisition cost ratio.