Here is a question most law firms cannot answer: how much does it actually cost you to sign a new client?
Not a lead. Not a phone call. Not a completed intake form. A signed retainer — a client who is officially on your books generating revenue.
Most firms track cost per lead (CPL). They know what Google Ads charges them per click, and their reporting shows "conversions" — usually form fills or calls. They call this CPL and use it to evaluate their marketing.
The problem: CPL tells you the cost of starting a conversation. Cost Per New Case (CPNC) tells you the cost of winning a client. Those two numbers often look nothing alike — and using CPL to make marketing decisions is like navigating with the wrong map.
CPL vs. CPNC: A Concrete Example
Say your Google Ads campaign generates 100 leads per month at $150 each — a $15,000 monthly spend. Your CPL is $150. Looks reasonable.
But here's what CPL doesn't show:
- Of those 100 leads, only 60 are actually qualified PI cases (the other 40 are wrong practice area, not injured, looking for a different service)
- Of the 60 qualified leads, your intake team reaches 45 within the first hour (the other 15 don't pick up and never call back)
- Of the 45 reached, your intake specialists convert 18 into signed retainers
So: 100 leads → 18 new cases. Your real Cost Per New Case is $15,000 ÷ 18 = $833.
That is five times higher than your CPL. And it is the number that actually tells you whether your marketing is profitable.
The CPNC Formula
CPNC = Total Marketing Spend ÷ Total New Cases Signed
Why CPL Is Misleading
CPL captures only the first step of a multi-step process. Between a lead coming in and a client signing a retainer, there are at least four places where cases fall through:
1. Lead quality filtering
Not every lead is a viable case. In personal injury, 20–40% of inbound leads are disqualified immediately — wrong injury type, no liability, represented by another attorney, or not actually injured. A campaign with a $100 CPL and 60% disqualification rate is effectively a $250 CPL campaign for qualified leads.
2. Speed and contact rate
Research consistently shows that leads contacted within five minutes convert at dramatically higher rates than leads contacted after an hour. If your intake team is reaching 60% of leads instead of 90%, that 30-point gap is pure CPNC inflation — you paid for those leads, and they evaporated because no one got to them fast enough.
3. Intake conversion rate
Among leads who are qualified and contacted, the intake conversation itself determines whether they sign. An untrained intake team that closes 25% of qualified conversations versus a trained specialist team closing 45% is the difference between 9 cases and 16 cases from the same ad spend.
4. Multi-passenger cases
This is the one most law firms completely miss in their reporting. A single car accident with four injured passengers can generate four cases from one lead. A CPL-based reporting system counts this as one conversion. CPNC tracking counts it as four new cases — which is the actual revenue reality.
Firms that track CPL and ignore multi-passenger cases systematically underestimate the ROI of their best campaigns. They sometimes pause campaigns that are actually profitable because the CPL looks high — when in reality that campaign is generating 1.8 cases per lead in multi-passenger accidents.
What Does a Good CPNC Look Like in 2026?
Benchmarks vary significantly by market, practice area, and case type. Based on data from PI law firms across multiple states:
| Market Type | Typical CPNC Range | Notes |
|---|---|---|
| Major urban market (NY, LA, Miami) | $800 – $1,800 | High competition, high case values |
| Mid-size market (Dallas, Denver, Atlanta) | $500 – $1,200 | Growing markets, improving competition |
| Smaller market / suburban | $300 – $800 | Lower volume but lower cost |
| Mass tort / high-value cases | $2,000 – $5,000+ | Higher spend, but case values justify it |
The right CPNC for your firm isn't a universal number — it is a function of your average case value. If your average PI case settles at $45,000 and your firm takes 33%, you collect $14,850 per case. A $1,200 CPNC means you are spending 8 cents to earn a dollar. That is excellent. The same $1,200 CPNC for a firm with a $12,000 average settlement is a much tighter margin.
The CPNC Profitability Test
Take your average case fee (settlement × firm percentage). Divide by your CPNC. If the result is below 5x, you have a margin problem — either marketing costs are too high, conversion rates are too low, or both.
How to Start Tracking CPNC
Getting accurate CPNC data requires connecting three systems that typically do not talk to each other:
Step 1: Tag leads by source at intake
Every lead that comes in needs to be tagged with its source — Google Search, Google LSA, Meta, referral, organic, etc. This sounds obvious, but most firms lose this attribution during the intake handoff. The lead gen company says "200 leads this month." The intake CRM shows "180 contacts." The case management system shows "42 new cases." Nobody connects them.
Step 2: Count cases, not intakes
Your denominator in the CPNC formula should be signed retainers, not completed intake forms. An intake form is not a new case. A signed retainer is. Make sure your intake CRM records the moment the agreement is executed — and that this event is tied back to the original lead source.
Step 3: Count all cases from a lead (multi-passenger)
If one lead results in multiple signed cases — a vehicle with multiple injured occupants, a family referral, a returned former client — count each case separately. Your marketing paid for that lead once and generated multiple revenue units from it. Not tracking this makes your CPNC look worse than it is and causes you to underfund your best lead sources.
Step 4: Report CPNC monthly, by source
Once your tracking is clean, build a simple monthly report: total spend per channel, total new cases per channel, CPNC per channel. This immediately shows you which channels are efficient and which are expensive. Most firms that run this analysis for the first time discover that one channel they have been underfunding generates their lowest CPNC — and one they have been scaling is the worst performer.
The Intake Gap: Where CPNC Breaks Down
Even firms that track CPNC correctly often have a blind spot: the gap between lead quality (which is a marketing problem) and intake conversion (which is an operations problem).
You can have outstanding lead quality and a terrible CPNC because your intake operation is losing cases. The most common failure points:
- After-hours leads go unanswered. Accidents happen at 11pm on a Friday. If your intake stops at 6pm, you are paying for leads that evaporate overnight.
- Slow follow-up on missed calls. A lead who does not answer the first call needs to be reached within 15 minutes on the second attempt. Many firms call back the next morning. By then, they have signed with a competitor.
- Untrained intake staff. Intake is a sales role. A person who reads questions off a script and says "an attorney will call you back" is not doing intake — they are doing data entry. Actual intake converts the qualified lead into a signed client on the first call.
- No bilingual coverage. In most major markets, 20–35% of PI leads are Spanish-speaking. If you cannot handle those calls with fluent Spanish intake, you are losing a third of your potential cases to firms that can.
Fixing the intake operation — not spending more on marketing — is often the fastest path to reducing CPNC. The leads are coming in. The cases are leaking out before anyone signs them.
What High-Performing Firms Do Differently
The PI firms with the lowest consistent CPNC share a few common traits:
They treat intake as a revenue function, not an administrative one. Their intake specialists are compensated partly on conversion rates. The person answering leads understands that every call is a potential $15,000–$50,000 revenue event.
They have 24/7 live coverage, not voicemail. A live person answers every call, any hour. Not a bot. Not a recording. A human who can qualify the case and get a retainer signed before the caller changes their mind.
They have bilingual intake. Full stop. In 2026, any PI firm doing significant volume that cannot handle Spanish-speaking leads fluently is leaving cases on the table every single day.
They review CPNC by source monthly and reallocate accordingly. Budget follows results. If LSA is producing a $600 CPNC and paid search is at $1,400, money moves to LSA. Simple. But it only happens if you are tracking the right number.
Start Here
If you are not tracking CPNC today, the first step is simple: for the next 30 days, count every signed retainer and trace it back to its original lead source. Divide your monthly marketing spend by the number of cases signed. That is your baseline CPNC.
Once you have that number, you will know where to focus. If CPNC is too high relative to your case values, the fix is usually one of two things: better intake conversion (faster response, trained specialists, 24/7 coverage) or better lead quality (more targeted marketing, stronger disqualification at the top of the funnel).
Either way, you cannot fix what you are not measuring. CPNC is the measurement that matters.
Want to Know Your Firm's CPNC?
HQ Intake tracks cost per new case — not cost per lead — for every client. We build the attribution layer, staff trained intake specialists 24/7, and give you a monthly report showing exactly what each case cost to acquire.
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