Total cost of ownership (TCO)
Definition
Total cost of ownership is the full cost of a system over its lifetime: build or licence, integration, hosting, model usage, support, changes and internal effort. For AI systems the usage-based model cost and the maintenance of integrations are the items most often underestimated.
A realistic AI business case compares TCO against the current cost of the manual process — hours per case, error correction, delayed invoicing, lost margin.
Model cost should be budgeted per case, so scaling volume never turns into an unpleasant surprise.
In practice
- Include integration maintenance and model usage per case
- Compare against the true cost of the manual process
- Budget and monitor cost per completed case
Related terms
- Cost per caseCost per case is the total cost of processing one unit of work — an invoice, a quote, an enquiry — including labour, software, model usage and error correction. It is the cleanest metric for comparing manual processing with an automated one.
- Custom softwareCustom software is built around a specific company's processes instead of forcing those processes into a standard product. It is chosen when the workflow is a competitive differentiator, when integration depth matters, or when licence and workaround costs exceed the build.
- Process auditA process audit is a structured review of recurring workflows: which steps exist, which systems and people are involved, how long each step takes, how often it fails, and what a case costs. It produces the evidence base for any automation decision.