An AI usage invoice is not the decision. Judge the work by what it costs, what it returns, and what waiting costs.
Net value means contribution margin, cash flow, or an avoided loss. Added AI cost includes model usage, infrastructure, review, rework, and support.
Rule: Released employee capacity is not cash savings. Measure what the next work returns, and never count the same benefit twice.
Assume $30,000 of all-in AI cost cuts delivery from ten weeks to five without changing scope, quality, security, or operational risk. At $20,000 per week in net value, five earlier weeks are worth $100,000.
Calculation: $100,000 earlier net value − $30,000 all-in AI cost = $70,000 net gain.
Capacity is upside only after you value the next work.
If the company actually avoids labor expense, add that cash saving to the $70,000. Otherwise add the measured net value of the next outcome, not its payroll allocation.
If the next item also takes five weeks with AI, it ships in week ten instead of week twenty.
Value: Measure the net value of receiving that second outcome ten weeks earlier. Do not call released payroll a cash saving.
Before funding, record baseline delivery time and cost, expected net value, all-in AI ceiling, and the range of uncertainty.
After delivery: Compare actual cost, timing, quality, and realized value. Move money toward proof. Stop when the economics fail.
The accepted outcome. The baseline. The expected net value. The all-in AI ceiling. The measurement date. The stop condition.
Decision: What did the work cost, what did it return, and what should you fund next?