A useful AI business case explains what changed, what it cost and how the business benefited. It does not turn every answered call into a sale or every hour released into money saved. Start with a defined workflow and baseline, then keep operational improvement, profit contribution and cash payback separate.
Define the outcome and the measurement window
Choose one job, such as handling appointment requests or transferring order information between systems. Record the current process over a representative window before changing it. A month can be a starting point, but seasonal demand, low volumes or a long sales cycle may require more evidence. State the dates and counts beside any reported rate.
Keep eligibility rules, lead sources and operating hours comparable during the pilot. Record what changed outside the AI workflow, such as advertising spend or staffing. A before-and-after difference is useful evidence, but those other changes may also explain it.
Five operational measures to keep alongside the finances
| Measure | Record |
|---|---|
| Coverage | Eligible calls or requests, answered or handled requests, and the configured hours and capacity. |
| Response and completion time | Receipt, first outreach attempt, first two-way contact and verified completion as separate timestamps. |
| Correct outcomes | Correct bookings or completed tasks, with attendance, cancellations, errors and rework shown separately. |
| Human effort | Handling, review, maintenance and exception time measured over comparable workloads. |
| Full operating cost | Software, model and phone usage, integration support, review and other costs of running the workflow. |
Define what counts as resolved before measuring cost per resolution. Divide the full cost of the process by verified completed tasks over the same window. Failed attempts and human review still contribute cost; a ticket closed automatically is not necessarily a correctly completed job.
Revenue, contribution, profit and cash are different
A booked appointment value is an estimate attached to a booking. Recognized revenue and cash collected depend on what is delivered and paid. Contribution is revenue less the variable costs of providing that additional work; it still has to cover any additional fixed costs before it becomes incremental operating profit. ACCA’s cost-volume-profit guide explains the contribution distinction.
For a cash-payback model, record when customer money arrives and when the related costs are paid. Include extra fulfillment costs, the AI build and running costs, review and maintenance, and any additional equipment, staffing or working-capital outlay. Avoid counting the same cost twice. If taxes or payment timing materially affect the decision, include them rather than treating an operating margin as cash.
Hours released are a separate capacity measure. Illustratively, 20 hours valued at an assumed $30 per hour gives $600 of capacity value. If wages and outside spending stay unchanged, that is not $600 of cash saved. If the hours instead produce additional work, count the evidenced contribution from that work and do not add the same capacity value again.
Calculate payback only when the inputs support it
Net incremental cash flow = additional cash receipts + documented cash costs avoided − additional cash operating costs. Keep the initial investment separate at the start, and include later investment or working-capital changes when they occur. Each term must be attributable to the proposed change, not all revenue flowing through the system.
Simple payback = upfront cash investment ÷ constant positive monthly net incremental cash flow. When monthly amounts vary, accumulate the actual or forecast cash flows instead. A zero or negative monthly amount does not produce payback under those assumptions. ACCA’s payback guide uses cash recovery, not accounting profit, and distinguishes simple from discounted payback.
State the horizon and basis of any ROI percentage. For the simplified cash-based examples below, the project return ratio is total incremental net cash benefit after all project costs divided by the AI build and running costs over the chosen period. Fulfillment costs are deducted from the benefit; they are not included again in that denominator. This defined ratio is not an accounting profit margin, an annualized investment return or a return on every additional business cash outflow. Simple payback also ignores the time value of money and benefits after the recovery date.
Two fictional examples, with the costs included
Illustrative only: every input in this table is invented to explain the calculation. Neither column represents My Smile Miami, Hall’s Heating & Air, a Benian quote or typical industry performance. The completed visits and jobs are assumed to be additional to the baseline. Receipts and related costs are assumed to occur in the same month; no tax, financing, other fixed costs beyond those shown or working-capital change is assumed.
| Input or calculation | Dental example | HVAC example |
|---|---|---|
| Additional completed, paid work (assumption) | 10 visits | 5 jobs |
| Cash received per completed unit (assumption) | $250 | $300 |
| Variable fulfillment cash cost per unit (assumption) | $150 | $220 |
| Additional cash receipts (calculated) | $2,500 | $1,500 |
| Additional fulfillment cash cost (calculated) | $1,500 | $1,100 |
| Contribution before AI costs (calculated) | $1,000 | $400 |
| Recurring AI, support and review cash cost (assumption) | $600 | $600 |
| Other cash costs avoided (assumption) | $0 | $0 |
| Monthly net incremental cash flow (calculated) | $400 | −$200 |
| Upfront project cash cost (assumption) | $2,400 | $2,400 |
| Simple payback if those amounts stay constant | 6 months | No payback under these assumptions |
In the dental illustration, $2,500 of receipts is not $2,500 of profit. After $1,500 of fulfillment costs and $600 of recurring project costs, $400 remains to recover the upfront $2,400. Over 12 identical months, the model produces $12,000 before project costs, incurs $9,600 of AI build and running costs and leaves $2,400 of net cash benefit: a 25% cash-based project return ratio on those defined AI costs. That result exists only under the stated fictional assumptions.
If the dental illustration produces only five additional completed visits per month, contribution falls to $500 and net monthly cash flow becomes −$100. The same build then has no payback under those assumptions. The HVAC illustration already produces negative monthly cash flow, despite generating additional revenue. These are reasons to test volume, unit costs and the proposal price before committing.
What our published cases establish
The My Smile Miami case study reports 93 bookings in month one and roughly $27,000 in estimated booked appointment value, based on the practice’s average appointment value. It does not establish collected cash, net profit or how many bookings were additional to what would otherwise have happened.
The Hall’s Heating & Air case study reports 23 jobs booked in month one and an owner-reported two hours saved per day. It does not publish job revenue or an average ticket, so it cannot establish a financial payback period. The owner’s time account remains client-reported capacity unless a cash effect is documented.
Keep the model open to a negative result
Use low, expected and high scenarios, with the source of each assumption visible. Test whether customers complete and pay for the additional work, whether the team can fulfill it, and whether review and maintenance consume the expected savings. Do not call assumed inputs conservative without evidence that supports that description.
Agree a review date and operational quality limits before the pilot. Keep, change or stop it based on the evidence and costs. A universal call-volume threshold or a published market adoption rate cannot make that decision for your business.
Use the AI project checklist and workbook to record scope, cost assumptions, tests and ownership. For an AI consulting engagement, agree which baseline and financial questions the scope will answer and what evidence is needed.