Cost per Signed Case: How Law Firms Measure It

By the Tagloud team · November 13, 2026

Most law firms know what they pay per call or per lead. Far fewer know their cost per signed case: what it really costs, from ad spend or vendor invoice to signed retainer, to bring in one new client from each source. That number decides where your marketing budget should go, and it is usually hiding behind cheaper-looking metrics.

This guide is for intake centers, law firms buying calls or leads, and the agencies that run their campaigns.

This is a marketing measurement guide, not legal advice. Attorney advertising, client solicitation and lead buying are regulated. Follow your state bar's advertising rules and your own counsel on what you may buy, how you may pay for it and how you track it.

What cost per signed case means

Cost per signed case = total spend on a source ÷ number of signed cases from that source

"Spend" is everything you paid that source: Google Ads cost, publisher or vendor payouts, or the price of a lead batch. "Signed case" is whatever your firm counts as a new client, usually a signed retainer or fee agreement. Pick one definition and use it for every source, or the comparison breaks.

The number sits at the end of a chain:

1. Spend on an ad, vendor or publisher
2. Calls and form leads from that source
3. Qualified calls and leads, the ones that met your intake rules
4. Signed cases, the qualified callers who became clients

Each source can fail at a different step, which is why measuring only the first two misleads.

Why cost per call and cost per lead mislead

Cheap calls can be the expensive ones

A vendor selling calls at a lower price looks like a better deal until you count how many of those calls met your rules. A source with more wrong numbers, out-of-area callers or people who already have a lawyer can cost more per qualified call, even with a lower price per call. Our guide to cost per qualified call walks through the math.

Qualified does not always mean signed

Even qualified callers sign at different rates by source. One campaign brings callers ready to hire a firm today, another brings people still researching.

Leads and calls get counted twice, or not at all

A person who fills in a form and then calls is one prospect, not two. Repeat callers inflate counts too. Without joining calls, form leads and signed cases, each source gets credit it didn't earn, or loses credit it did.

An example

Say a firm buys from two vendors in the same month.

On cost per call, Vendor B looks 25% cheaper. On cost per signed case, it costs twice as much. Moving budget to B because its calls were $15 cheaper would double what each new client costs.

These figures are an illustration, not a benchmark.

How to measure cost per signed case, step by step

Step 1: Define a signed case

Write down the exact event that counts: a signed retainer, a signed fee agreement, or an accepted case after review. Decide what happens when a client signs and then drops out.

Step 2: Write your intake rules

Qualified calls are the middle of the chain, so they need a clear definition. Use plain, checkable rules such as "lives in a state the firm serves" or "does not already have an attorney for this matter". Our SSDI call qualification rules show how to write them so each one can be checked on the call.

Step 3: Tag every call and lead with its source

Each call needs its publisher, vendor or campaign attached, which your call platform usually records. For your own ads, give each campaign its own tracking number or UTM tags, and keep the Google click ID on website visits so a call or form lead can be traced back to the ad and keyword.

Step 4: Collect spend by source

Pull Google Ads cost by campaign, vendor and publisher payouts, and lead batch prices into one place, using the same date range. A lead batch bought for one price should be treated as one source.

Step 5: Check every call against your rules

Spot-checking a few recordings gives you a guess. Checking every call the same way, with a reason for each verdict, gives you a qualified count you can defend to vendors.

Step 6: Join signed cases back to the source

This is the step most firms skip. When intake marks a person as signed, that status needs to reach the call or lead record that came in, and through it, the source. Match on the caller's phone number or the lead record, and pick a fixed window, such as signed within 60 days of first contact, so late signings aren't lost or double-counted.

Step 7: Compare and act monthly

Divide spend by signed cases for each vendor, publisher and campaign. Signed cases lag behind calls, so review at least a month of data before cutting a source, and use cost per qualified call as the early signal.

Set a target cost per signed case

Work backwards from what a case is worth to your firm after costs, and decide how much of that you are willing to spend to acquire it. Set a target cost per signed case per practice area and a matching target cost per qualified call (target per signed case × the share of qualified callers who sign). Then watch which sources sit above target.

How Tagloud helps

Tagloud covers the middle of the chain and ties it to your spend. It pulls calls from CallGrid, Ringba, Retreaver or any webhook, and checks every call by AI against your own intake rules, or as "transferred = qualified" if you pay on transfers. Every verdict has a reason with quotes from the call. It joins calls with Google Ads spend and vendor payouts and shows cost per qualified call by publisher, campaign, tag and keyword, with useful vs wasted spend week by week.

The Leads CRM lists every website form lead, shows whether that person called and whether the call qualified, and lets intake set a status, including Signed, with owner, value and notes, plus CSV export. The Google Ads script can send only qualified calls back as conversions so Smart Bidding learns from callers worth talking to; see sending qualified calls to Google Ads. More on how firms use it: Tagloud for intake centers and law firms.

FAQ

What is a good cost per signed case?

There is no universal answer. It depends on your practice area, market and what a case is worth to your firm. Set your own target from case value and compare sources against it, not against numbers from other firms.

How long should I wait before judging a vendor?

Long enough for signings to catch up with calls, often at least a month. Watch cost per qualified call in the meantime.

Should I use cost per signed case for Google Ads too?

Yes. Converting Google Ads cost, vendor payouts and lead batches to cost per signed case puts them on one scale, so you can compare a click-based campaign with a pay-per-call vendor fairly.

What if intake can't record which source a client came from?

Match on the caller's phone number or the form lead record instead of asking the client. That is more reliable than self-reported answers.