How to Set a Lead Generation Budget That's Tied to Signed Case Targets

Ask a PI marketing director how their budget was set and you'll usually hear some version of the same answer: last year's number, adjusted for growth. Sometimes it's matched to a competitor's apparent spend. Sometimes it's whatever the partners approved last cycle. What it's almost never tied to is a specific signed case target — the one output that actually drives firm revenue.

That's the gap this article closes. The math is straightforward. What's hard is having the data to run it well — and we'll cover what to do when you don't.

Why Most Budgets Are Set Backward

The traditional PI marketing budgeting process: set a budget, deploy it across channels, evaluate results, adjust. The flaw is in the first step. Setting a budget without a case target means you have no way to evaluate whether the budget is right.

$150,000 per month is too much for a firm targeting 10 signed cases and almost certainly too little for a firm targeting 80. The right number depends entirely on what you're trying to produce. Without a target, you can't know.

Flip the process. Start with your signed case target. Work backward to the budget. Now every dollar has a defined job — and you can tell immediately when the math doesn't work.

The Core Formula

Two equations drive the whole framework:

Required budget = Target signed cases × Expected cost per case

If you want to sign 60 cases per month and your expected cost per case is $3,500, your required lead generation budget is $210,000 per month. Simple — but most firms can't run this calculation because they don't know their cost per case by source.

Once you have a budget figure, verify it against lead volume:

Required leads = Target signed cases ÷ Conversion rate

At a 6% lead-to-case conversion rate, 60 signed cases requires 1,000 leads per month. At a $210,000 budget, that implies a blended cost per lead of $210. Does that match your channel mix? If not, either your conversion rate or your cost per lead assumption needs adjusting — before you commit to the number.

Step-by-Step: Building the Budget

Step 1: Define Your Case Target

Start with a concrete signed case target for the next 12 months. If your firm handles multiple case types, break the target down by type — conversion rates and cost per case differ meaningfully across motor vehicle, mass tort, and slip-and-fall.

A firm growing from 40 to 60 signed cases per month needs to close 20 additional cases monthly. That gap is what the budget exercise needs to fund.

Step 2: Establish Your Cost Per Case by Source

This is the most critical input — and where data quality matters most. If you have reliable cost per case data by vendor and channel, use it. If not, these ranges are reasonable starting proxies:

• Google Ads: $2,500–$6,000 per case (market-dependent)
• LSA: $1,500–$4,000 per case
• Lead vendors (exclusive): $2,000–$5,000 per case
• Lead vendors (shared): $2,500–$7,000 per case
• Social media: $3,000–$9,000 per case

Use the low end if you're in a less competitive market with a strong intake team. Use the high end if you're in a major metro or your conversion rates run below average.

Step 3: Allocate Your Target Cases Across Sources

Distribute your target cases across channels based on your planned strategy. Precision isn't required — directional accuracy is. Here's what a 60-case target might look like across a typical channel mix:

• Google Ads: 20 cases (33%) at $3,500/case = $70,000
• LSA: 10 cases (17%) at $2,000/case = $20,000
• Lead vendors: 22 cases (37%) at $3,200/case = $70,400
• Social: 8 cases (13%) at $4,500/case = $36,000
• Total: 60 cases at blended $3,275/case = $196,400/month

Step 4: Verify Against Lead Volume Requirements

Apply your conversion rate assumptions by source to calculate the implied monthly lead volume:

• Google Ads: 20 cases ÷ 8% conversion = 250 leads needed
• LSA: 10 cases ÷ 7% conversion = 143 leads needed
• Lead vendors: 22 cases ÷ 5% conversion = 440 leads needed
• Social: 8 cases ÷ 2% conversion = 400 leads needed
• Total: 1,233 leads per month

Can your intake team work 1,233 leads per month effectively? If not, either scale the budget back to match capacity or plan to grow intake alongside marketing spend. These two numbers have to move together — leads your team can't work are wasted spend.

Step 5: Adjust for New vs. Known Sources

Planning to add a new vendor or channel? Build in a premium. New sources take time to optimize — your intake team needs to learn how to work the lead type, and you need volume to identify what converts.

A practical adjustment: assume new sources will run 30–50% less efficient than your current channels for the first 90 days. Then revise based on actual cost per case data as it accumulates.

Handling Imperfect Data

Most firms attempting this exercise for the first time don't have clean cost per case data by source. That's not a reason to skip it. Here's how to proceed anyway:

• Use your best estimates and document your assumptions. A budget built on explicit assumptions beats no budget at all. Write down what you assumed and why, so you can revise when better data arrives.
• Start tagging signed cases by source immediately. Even with incomplete historical data, consistent source tagging from today generates reliable cost per case data within 60–90 days. You can't retroactively fix old data, but you can stop the problem from compounding.
• Use a blended cost per case as a baseline. If you don't know cost per case by vendor but you know your overall spend and conversion rate, calculate one blended number. It won't show you which vendors are pulling their weight, but it gives you a starting budget anchor.

Quarterly Budget Reviews

A case-target-based budget isn't static — it's a model with assumptions that need testing against actual results. Review quarterly:

• Are signed case volumes matching targets? Consistently 20% below target signals one of three things: cost per case assumptions are too optimistic, conversion rate assumptions are off, or there's a channel-specific issue worth investigating before the next budget cycle.
• Are actual cost per case numbers matching assumptions? A channel outperforming your model deserves more budget. One underperforming deserves a root cause review — not an automatic cut — because sometimes the issue is fixable.
• Does the budget still match intake capacity? If you're generating leads your team can't work effectively, the extra spend is waste. Marketing budget and intake capacity need to be reviewed together, not in separate planning cycles.

The Difference This Makes

Firms that tie marketing budgets to signed case targets make better allocation decisions — consistently. The reason is simple: when every channel has a cost per case benchmark, every budget question has a clear answer.

“Should we increase Vendor A?” becomes: “Vendor A produces cases at $2,800 against our $3,500 target. Yes.” “Should we keep running social ads?” becomes: “Social is running at $6,200 per case against our $3,500 target. Let's set a 90-day improvement threshold before we cut it.”

That clarity is what separates firms that optimize their marketing spend from firms that simply spend it.