Cost Per Signed Case: How Personal Injury Firms Find the True Number

What Cost Per Signed Case Means (and Why Cost Per Lead Isn’t It)

A lead is a phone call, a form fill, or a chat. A signed case is a client who signed your retainer. The gap between the two is where most personal injury marketing money disappears.

Cost per lead tells you how cheaply a channel fills your intake queue. It says nothing about how many of those people had a real case, how long intake spent screening them, or how many signed. A channel with cheap leads and a low sign rate can cost far more per case than a channel with expensive leads that sign often.

Cost per signed case fixes that by measuring the thing you actually want to buy. It’s the personal injury version of customer acquisition cost, and it’s the first number a managing partner should see when deciding where next month’s budget goes. If you want the broader version for any business, see our guide to true cost per lead and how it rolls up into acquisition cost.

Sources: LEXGRO PI cost per lead benchmarks, InjuryLeadGen conversion rates, Super Lawyers on contingency fees.

The Cost Per Signed Case Formula

The basic cost per signed case formula is simple. The work is in deciding what goes on top of the fraction.

Work through it in this order:

1. Pick a time window. Use a window long enough for leads to sign. A lead from the last day of the month may sign two weeks later, so count retainers from leads that came in during the window, not retainers dated in it.
2. Add up the marketing cost per channel. Ad spend from the ad platform, plus fees paid to lead vendors, minus any credits for returned leads.
3. Add intake cost. The staff time, answering service, and call tracking it took to screen every lead from that channel, including the ones you turned down.
4. Count signed retainers per channel. Pull these from your intake CRM, matched to the lead’s original source.
5. Divide. Total cost divided by signed retainers is your true cost per signed case for that channel.

What Cost Per Signed Case Benchmarks Say (and Why They Disagree)

Search for a personal injury cost per signed case benchmark and you’ll find numbers that don’t agree. That’s not because someone is wrong. Market, case type, channel, and how each source counts cost all move the number.

Look at the conversion row. A firm signing 2% of leads needs 50 leads per case. A firm signing 25% needs four. At the same cost per lead, that’s a twelve-fold difference in cost per signed case. This is why a benchmark is a sanity check, not a target. The number that should drive your budget is your own cost per signed case, by channel, from your own intake data.

The Costs Most Firms Leave Out

Even firms that calculate cost per signed case usually stop at ad spend divided by cases. That undercounts. Here’s what belongs in the numerator:

• Intake labor on rejected leads. Every lead intake screens and turns down still costs staff time. Channels with low sign rates carry much more of this cost.
• Answering services and after-hours coverage. If you pay per call or per minute, allocate it to the channels that generate the calls.
• Call tracking and software. Tools like CallRail that attribute calls to campaigns are part of what it costs to acquire a case.
• Lead vendor fees and returns. Count the fees you paid and subtract credits for leads you returned. Returned leads still cost intake time.
• Compliance cost on bought leads. Consent records, scrubbing, and review time are real costs; see our breakdown of TCPA compliance cost for law firms.
• Agency management fees. If an agency charges a percentage of spend, the true media cost is higher than the platform shows.

None of these show up in the ad platform. That’s why a Google Ads dashboard can look healthy while the firm’s P&L doesn’t. Our post on personal injury ad spend attribution goes deeper on how blended cost per lead hides these gaps.

Cost Per Signed Case Example: Three Channels, One Month

This illustrative example uses round numbers, not client data. A firm spends $105,000 across three channels in a month and assumes $25 of intake cost for every lead it screens.

By cost per lead, the lead vendor looks best at $125 and Google Ads looks worst at $400. By cost per signed case, Local Services Ads win at $1,125, the vendor lands in the middle at $2,750, and Google Ads is the most expensive at $3,542. The blended cost per lead across all three is $233, and the blended cost per signed case is $2,370. Neither blended figure describes any real channel.

From Cost Per Signed Case to Profit Per Signed Case

Here’s where most analysis stops too early. A signed case isn’t revenue. It turns into a fee only if the case resolves with a recovery, and the size of that fee depends on the case. Different channels bring in different kinds of cases.

So the better question isn’t “what does a case cost?” It’s “what does a case make?” Multiply the average fee by the share of signed cases that resolve with a fee to get the expected fee per signed case, then subtract the cost per signed case.

Now the picture flips again. Google Ads has the highest cost per signed case, but its cases carry larger fees, so it earns almost as much per case as Local Services Ads. The lead vendor, with the cheapest leads, is close to break-even. Cutting Google Ads because it “costs too much per case” would throw away $87,450 a month. The right moves: keep scaling Local Services Ads, hold Google Ads, and renegotiate with the vendor or cut it.

This is net marketing contribution applied to a law firm: what each channel adds after its costs. For the full method, see how to calculate contribution margin. Case mix matters too; our guide to personal injury case type CAC shows why one target doesn’t fit every case type.

A note on timing. Personal injury fees can arrive months or years after signing. You can’t wait that long to judge a campaign, so firms use expected fees based on their own history by channel and case type, then true them up as cases resolve. Read more on personal injury settlement lag and why 30-day dashboards mislead.

Why Blended Numbers Hide the Losing Channel

In our example, the firm’s blended cost per signed case is $2,370. That sounds fine. It sits inside the published range. But it averages a channel that earns $5,175 per case with one that earns $250. The average makes a weak channel look acceptable and gives no signal about where the next dollar should go.

The same thing happens across offices and states. A multi-office firm that reports one number hides the office where marketing isn’t working; see multi-state PI firm attribution. It happens with aggregators too: our breakdown of mass tort lead aggregator economics shows how blended cost per lead hides which sources pay off. And it’s the same reason ROAS can look good while campaigns lose money.

How to Track Cost Per Signed Case in Your CRM

You can’t calculate cost per signed case by channel if a lead’s source gets lost between the first call and the signed retainer. Four habits fix most of it:

1. Capture the source on every lead. Use UTM parameters on forms and tracked numbers on calls so every lead enters the CRM with its campaign attached.
2. Keep the source when the lead converts. The signed case record should carry the same source as the original lead, not “phone” or “walk-in.”
3. Log rejections with a reason. Knowing why intake turned a lead down by channel tells you whether the problem is targeting, the vendor, or intake speed.
4. Record fees when cases resolve. Tie the final fee back to the case’s original source so your expected-fee assumptions get more accurate every month.

HubSpot and Salesforce can both hold this data, and call tracking like CallRail keeps the source on phone leads. When you model fees, remember that contingency terms are set by written agreement under professional conduct rules such as ABA Model Rule 1.5, so use the fee percentages in your own retainers, not an industry average.

Where Allocera CDAI Fits

CDAI (Capital, Decision, Accuracy, Intelligence) is the engine behind Allocera Intelligence. It doesn’t replace your intake CRM, your ad accounts, or your agency. It works alongside them and turns their data into profit per campaign and partner.

It connects to your existing stack. Meta, Google Ads, LinkedIn, HubSpot, and Salesforce connect in one click. CallRail connects with an API key. There are also built integrations for Ringba, Boberdoo, Bing, and Stripe, plus CSV import and a webhook for any other system. See how it works.

Then, every night, for every campaign, it:

• Calculates real profit. True cost per lead, true customer acquisition cost, and real margin after every fee, partner payout, refund, chargeback, operating cost, and compliance cost.
• Holds partners accountable. Close rate, payouts, refunds, and chargebacks for every lead partner, each with a risk tier.
• Makes one of eight decisions: scale, hold, cut, pause, quarantine, renegotiate, investigate, or flag, with the numbers and a confidence level behind it. You stay in control of every move. Our guide to marketing budget allocation explains each one.
• Judges each campaign on the right timeline. It uses a rolling window matched to your sales cycle (30 days by default), and it never cuts a campaign just because deals haven’t closed yet.
• Stops on bad data. Serious data problems stop that night’s calls instead of driving them, and referral or offline revenue is counted but never forced into a campaign.

Validated before release

Before release, CDAI’s decisions were checked in a controlled validation across 9 businesses in 7 industries: 89.5% accurate overall (1,210 of 1,352 scored decisions), with the underlying math matching 100%. Every decision type:

Read the full method and results in our contribution margin marketing validation report or on the proof page.

Five Cost Per Signed Case Mistakes to Avoid

5. Judging too early. Leads sign days or weeks after the first call, and fees arrive much later. Use a window that matches your intake cycle and update fee assumptions as cases resolve. Other industries have the same problem with different names: cost per booked job in HVAC, cost per move-in in senior living, and cost per admission in addiction treatment.

Cost Per Signed Case FAQs