There’s a number most ABA practice owners know but don’t think about often enough: the weekly revenue value of a single filled authorised session slot.
Take a client authorised for 20 hours per week at a blended billing rate of $60 per hour. That client generates $1,200 per week, or $4,800 per month, in gross revenue. Over their full engagement (which averages somewhere between 18 and 30 months depending on the child’s age and treatment goals) that single client represents $86,000 to $144,000 in total gross revenue.
An empty slot isn’t neutral. An empty slot is the active absence of that number.
The Invisible Loss
Most business costs are visible. Payroll appears on the books. Rent appears on the books. The Google Ads invoice appears on the books. What doesn’t appear on the books is the revenue that didn’t arrive because an authorised session slot wasn’t filled, or because a qualified enquiry went cold before it converted, or because the intake process lost a family who would have stayed for two years.
Practice owners tend to think about marketing costs as the money they spend on advertising and agency fees. The more relevant number is the billable hours they don’t capture because their marketing and intake programme isn’t filling the available capacity.
Consider a practice with 15 open authorised session slots. Each slot represents a 20-hour-per-week client at $60/hour, which is $1,200/week. Fifteen slots: $18,000 per week in potential revenue sitting empty. If those slots remain unfilled for three months while the practice considers whether to invest in a marketing programme, the cost of not investing is $234,000 in foregone gross revenue.
Against that number, a $4,000/month marketing programme looks very different than it does when evaluated as an isolated expense.
The Calculation Most Practices Don’t Do
Here’s a framework for evaluating any marketing investment in ABA therapy:
- What is the average weekly billable revenue from one fully-scheduled authorised client? (hours × blended rate)
- What is the average engagement length in weeks?
- What is the lifetime revenue value of one client? (1 × 2)
- What is the maximum cost-per-authorised-client where the investment still makes clear financial sense? (a fraction of 3)
- Is my current marketing programme producing clients at or below that cost?
For most ABA practices with open capacity, the maximum sensible acquisition cost is somewhere between $1,000 and $3,000 per client, representing a 30:1 to 100:1 return on a single client acquisition against their lifetime revenue.
Most ABA Google Ads programmes produce authorised clients at a cost between $400 and $1,500 in competitive markets. The ROI multiple is obvious once the lifetime value calculation is made. The reason many practices don’t invest aggressively in marketing isn’t that the ROI is bad. It’s that the calculation is never made.
The Right Question to Ask
Most practice owners ask: “How much does marketing cost?” The right question is: “What is my cost per authorised client, and what does that client generate over their engagement?”
When the question is framed as a cost, $4,000/month looks like an expense. When it’s framed as a client acquisition model, $4,000/month that produces three to five new authorised clients (each worth $86,000 to $100,000 in lifetime revenue) looks like a very different decision.
What About BCBA Capacity?
The calculation above assumes the practice has BCBA capacity to serve additional clients. If the constraint isn’t marketing but clinical staffing (not enough BCBAs to run the sessions), then the correct first investment is staffing, not advertising.
But two things are true simultaneously. BCBA recruitment is easier for practices with strong brand presence and a full caseload (which is a marketing outcome), and the most common growth constraint in ABA therapy isn’t clinical staffing but client acquisition. The practices that tell us “we can’t take more clients because we don’t have enough BCBAs” are often describing a secondary constraint that appears once the primary constraint (not enough qualified enquiries) is solved.
Both constraints are real. The sequence is: market to fill current capacity, then recruit to expand it, then market to fill the expanded capacity again.
The Compounding Effect
Filled slots don’t just generate revenue for one month. They generate revenue for 18 to 30 months. Each cohort of clients acquired through marketing generates a compounding revenue base, one that continues to grow as new clients are added and existing clients continue their engagement.
A practice that acquires five new authorised clients per month, each generating $4,800/month in revenue, adds $24,000/month to its recurring revenue base. After six months, assuming typical retention, that base is approaching $144,000/month in ongoing revenue from just six months of client acquisition. Before accounting for clients acquired before the six-month mark.
The cost of a marketing programme that enables this is the cost of not filling those slots.
Reputation Elevation builds marketing programmes for ABA therapy practices that produce authorised clients, measured by cost-per-client, not impressions. Use our ROI framework or schedule a call to model what your practice’s open slots are actually worth.