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

Most personal injury firms track cost per case. But when they say “cost per case,” they almost always mean cost per signed case — the amount spent to acquire a retainer. That number is useful. It tells you what each signed client costs to bring through the door. But it does not tell you the whole story.

Cost per settled case is the metric that completes the picture. It measures the total acquisition cost required to produce a case that actually resolves and generates revenue. The difference between the two is not semantic — it is the gap between measuring activity and measuring outcomes.

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 is valuable for several things. It tells you what it costs to get a client in the door. It allows you to compare vendor acquisition efficiency. It gives your intake team a target to benchmark against. And because the data is available quickly — usually within days or weeks of the spend — it is actionable in near-real time.

The problem is what it leaves out.

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.

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

Why the Gap Between Them Matters

A 24% gap between cost per signed case and cost per settled case is not unusual for PI firms. But the size of that gap varies dramatically by lead source — and that variation is where the strategic insight lives.

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

If you are making budget decisions based only on cost per signed case, you are systematically over-investing in vendors whose cases look good at intake but fall apart before settlement.

The Settlement Lag Problem

The reason most firms do not track cost per settled case is simple: the data takes too long to arrive. Personal injury cases typically settle 6 to 18 months after signing. Some take longer. By the time a case settles, the connection to the original marketing source is often lost.

This creates a structural blind spot. Firms make budget decisions based on cost per signed case because it is the metric they can measure quickly. But they are optimizing for the wrong endpoint — signing, not settling.

Revenue intelligence platforms solve this by maintaining the link between marketing source and case outcome across the full lifecycle. When a case signs in January and settles in October, the attribution persists. The vendor who generated that lead gets credit — or blame — for the outcome, not just the intake event.

How Attrition Rates Distort Vendor Rankings

Attrition is not evenly distributed across lead sources. Some vendors generate leads that are pre-qualified, well-informed, and motivated. Their cases sign and settle at high rates. Other vendors generate volume — lots of signed retainers — but a significant percentage of those cases never produce revenue.

Here is what this looks like in practice across a five-vendor portfolio:

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

Cost per signed case would tell you to give Vendor E more budget. Cost per settled case — combined with settlement value — tells you to 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.

Using all three together gives you a complete picture of vendor performance. A vendor with a high cost per settled case might still be your best performer if their cases settle at 3x the portfolio average. A vendor with a low cost per settled case might still be underperforming if their settlements are 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.