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

Most PI marketing budgets are set by feel — last year's budget plus a percentage, or matching what competitors appear to be spending, or whatever the firm can absorb this quarter. This approach produces budgets that are disconnected from business outcomes. The better approach starts from the opposite direction: define your signed case target, then calculate the budget required to hit it.

This article walks through that calculation step by step. The math is straightforward, but doing it well requires data that many firms don't have clean access to yet. We'll cover what to do with imperfect data too.

Why Most Budgets Are Set Backward

The traditional budgeting process for PI marketing looks like this: set a budget, deploy it across channels, evaluate results, adjust. The problem is that the first step — setting a budget — is often disconnected from any specific output target.

When you set a budget without a case target, you can't evaluate whether the budget is right for your goals. $150,000 per month is too much for a firm trying to sign 10 cases per month, and probably too little for a firm trying to sign 80. The right budget depends on what you're trying to produce.

Working backward from signed case targets solves this problem. It connects your marketing budget directly to business outcomes, and it makes it obvious when your budget assumptions need revisiting.

The Core Formula

The formula is simple:

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.

From there, you can work backward one more step if you want to verify the lead volume required:

Required leads = Target signed cases ÷ Conversion rate

If your intake team converts 6% of leads to signed cases, you need 1,000 leads per month to sign 60 cases. At $210,000 budget, that implies a blended cost per lead of $210. Does that align with your expected channel mix? If not, either your conversion rate assumption or your cost per lead assumption needs adjusting.

Step-by-Step: Building the Budget

Step 1: Define Your Case Target

Start with a concrete signed case target for the next 12 months. Break it down by case type if you serve multiple segments — the cost per case and conversion dynamics are different across case types.

Example: A firm that wants to grow from 40 to 60 signed cases per month needs to generate 20 additional cases monthly. That's the gap the budget exercise needs to close.

Step 2: Establish Your Cost Per Case by Source

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

• Google Ads: $2,500–$6,000 per case (depending on market)
• 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 are below average.

Step 3: Allocate Your Target Cases Across Sources

Determine what share of your target cases you expect from each source. This doesn't need to be exact, but it should reflect your planned channel strategy. Example allocation for 60 target cases per month:

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

Step 4: Verify Against Lead Volume Requirements

Using your conversion rate assumptions by source, calculate the implied 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

Ask: does your intake team have the capacity to work 1,233 leads per month? If not, either the budget needs scaling back to match intake capacity, or intake capacity needs to increase alongside the budget. Marketing budget and intake capacity need to grow together.

Step 5: Adjust for New vs. Known Sources

If you're planning to add a new source or vendor, apply a higher cost per case assumption than your historical data suggests. New sources take time to optimize. A new vendor relationship might produce cases at $5,000 in month one or two before your intake team learns how to work their lead type effectively.

A reasonable adjustment: assume new sources will be 30–50% less efficient than your current channels for the first 90 days, then revise based on actual data.

Handling Imperfect Data

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

• Use your best estimates and document your assumptions.A budget built on explicit assumptions is more useful than no budget at all. Write down what you assumed and why, so you can revise when you have better data.
• Start tracking source tags on signed cases immediately.Even if your historical data is incomplete, you can start generating accurate cost per case data by source within 60–90 days if you begin tagging leads consistently now.
• Use conversion rate as a proxy.If you don't know cost per case by vendor but you know your intake team's overall conversion rate and overall marketing spend, you can calculate a blended cost per case to start. It won't show you which vendors are performing, but it gives you a starting budget baseline.

Quarterly Budget Reviews

A case-target-based budget is not a set-it-and-forget-it exercise. Review your assumptions quarterly against actual performance:

• Are signed case volumes matching targets?If you're consistently 20% below target, either your cost per case assumptions are too optimistic, your conversion rate assumptions are off, or there's a channel-specific issue worth investigating.
• Are actual cost per case numbers matching assumptions? If a channel is performing better than expected, it may deserve more budget. If it's worse, investigate before simply cutting — sometimes the issue is fixable.
• Does the total budget match your intake team's capacity? If you're generating leads your intake team can't work effectively, the extra spend is wasteful. Intake capacity and marketing budget need to be reviewed together.

The Difference This Makes

Firms that set marketing budgets tied to signed case targets consistently make better allocation decisions than firms that set budgets disconnected from output goals. The reason is simple: when you know what each case should cost to acquire, every channel decision has a clear benchmark.

“Should we increase our vendor A budget?” becomes: “Vendor A produces cases at $2,800 against our $3,500 target. Yes.” “Should we keep running social ads?” becomes: “Social is producing cases at $6,200 against our $3,500 target. Let's investigate why and set a 90-day improvement threshold.”

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