The Hidden Cost of Slow Case Velocity and How to Calculate What it Costs Your Firm

Every PI firm knows what it spends to acquire a case. Fewer know what it costs to carry that case from retainer to resolution. And almost none calculate the opportunity cost of slow case velocity — the revenue they forgo because capital is locked inside a pipeline instead of being reinvested.

Slow case velocity is not just an inconvenience. It is a measurable financial cost that compounds every month a case sits unresolved. This article gives you the formula, the benchmarks, and a worked example so you can calculate exactly what slow velocity costs your firm.

The Three Components of Carrying Cost

The total cost of carrying a case from signing to settlement has three components. Most firms only track the first one.

Acquisition cost is the marketing spend required to generate the lead and convert it to a signed retainer. This is the number most firms track. For PI firms spending $100K to $500K per month, cost per signed case typically ranges from $2,500 to $5,000 depending on market and case type.

Operating cost per month includes everything your firm spends to maintain an active case: attorney time (even if minimal during treatment), paralegal and staff time for status updates and client communication, case management system costs, and direct case expenses like medical records and expert consultations. For a typical motor vehicle case, this runs $800 to $1,500 per month depending on case stage and firm overhead structure.

Opportunity cost per monthis the return you could generate if the capital tied up in the case were deployed elsewhere. If your firm's blended marketing ROI is 8x annually and you have $3,500 in acquisition cost plus accumulated operating costs deployed in a case, the monthly opportunity cost is roughly $680. This number grows each month because the total capital deployed grows.

The Formula

Total carrying cost for a single case:

Total Carrying Cost = Acquisition Cost + (Operating Cost/Month x Months to Settle) + (Opportunity Cost/Month x Months to Settle)

For a case with $3,500 acquisition cost, $1,150 monthly operating cost, and $680 monthly opportunity cost:

The difference between an 8-month case and an 18-month case is $18,300 in additional carrying cost. That is not a rounding error. On a $40,000 settlement at a 33% contingency fee, your firm's gross revenue is $13,200. If the carrying cost difference between a fast vendor and a slow vendor is $18,300, the slow vendor's cases may be producing a negative net return — even though the settlement values look acceptable.

Scaling the Impact: 20 Cases Per Month

The per-case math is concerning. The portfolio math is alarming. Let's scale this to a firm signing 20 cases per month from a vendor whose cases average 14 months to settle, compared to a vendor whose cases average 8 months.

That is a $4.4 million difference in annual carrying cost between two vendors delivering the same number of cases. The 14-month vendor is not just slower — it is consuming $4.4 million more in capital, attorney time, and forgone reinvestment opportunity than the 8-month vendor.

Even if the slower vendor has a lower cost per case on acquisition, the total cost picture inverts once you account for carrying costs. A vendor charging $3,500 per case with 8-month velocity costs your firm less than a vendor charging $2,800 per case with 14-month velocity — substantially less.

The Compounding Problem

Carrying costs compound in a way that is not immediately obvious. Each month a case remains open, three things happen simultaneously:

1. Direct costs accumulate.Attorney time, staff time, and case expenses continue to accrue. Even a “dormant” case during client treatment requires periodic check-ins, status updates, and document management.
2. Opportunity cost increases. The total capital deployed in the case grows each month as operating costs accumulate. The opportunity cost is calculated on the entire deployed amount, not just the original acquisition cost.
3. Pipeline capacity is consumed.Every open case occupies space in your attorney's caseload. A case that takes 16 months instead of 10 is occupying a caseload slot for 6 additional months — a slot that could hold a newer, faster-resolving case.

This compounding effect means the marginal cost of each additional month of case duration actually increases over time. Month 15 of a case costs more than month 8, even at the same monthly operating rate, because the opportunity cost base has grown.

Calculating Your Firm's Velocity Cost

To calculate the carrying cost impact for your specific firm, you need four numbers:

1. Average acquisition cost per case — your blended cost per signed case across all vendors, or broken out by vendor if you have it.
2. Monthly operating cost per case — take your total firm operating expenses (excluding marketing spend), divide by your average active caseload, and divide by 12. For most PI firms in the 10 to 50 attorney range, this falls between $800 and $1,500 per case per month.
3. Average case duration by vendor— the median months from retainer to settlement for each lead source. If you don't have this segmented by vendor, start with your blended average and work from there.
4. Your firm's cost of capital — the interest rate on your operating line, or an 8 to 12% annual rate if you are self-funding. This determines your opportunity cost calculation.

With these four inputs, the formula becomes specific to your firm:

Annual Velocity Cost Per Vendor= (Cases/Month) x 12 x [Acquisition Cost + (Monthly Operating Cost x Avg Duration) + (Monthly Opportunity Cost x Avg Duration)] — summed across vendors, then compared against a portfolio where all vendors matched your fastest vendor's velocity.

What Firms Typically Discover

When PI firms first calculate carrying costs by vendor, three patterns appear consistently:

The vendor ranking shift is the most actionable finding. Firms that evaluate vendors only on cost per case frequently discover that their “cheapest” vendor is actually their most expensive vendor once carrying costs are factored in. The low acquisition cost is more than offset by longer case durations that consume more operating cost, more opportunity cost, and more attorney capacity.

The Budget Reallocation Math

Here is a simplified example of what happens when you reallocate 20% of your budget from a slow vendor to a fast vendor:

A modest 20% reallocation — $5,000 per month moved from a slow vendor to a fast vendor — reduces total annual carrying cost by over $1.1 million. The cases are still being signed. The volume is the same. The only thing that changed is which vendor gets the budget, based on which vendor's cases resolve faster.

Why This Matters for Your Next Partner Meeting

Managing partners who approve marketing budgets are trained to think in terms of cost per case and total spend. They rarely see the carrying cost dimension because it is not in the standard report.

But carrying cost is the metric that connects marketing spend to firm profitability — not just revenue. A firm generating $15 million in annual settlement revenue with $3 million in total carrying costs is fundamentally more profitable than a firm generating $15 million with $5 million in carrying costs, even if their marketing budgets and case volumes are identical.

The difference is velocity. And velocity is measurable, vendor-specific, and actionable.

RevenueScale's case analytics calculates carrying cost by vendor automatically — connecting acquisition spend, case duration, and settlement outcomes into a single view that shows you the true cost of every case in your pipeline.