Legacy estates cost money every year: scarce skills, workarounds, slow change, outage risk and missed opportunities. A fair business case compares the project with the ongoing cost of the current state.
Costs to include
- Run costs — licences, hosting and support for the old stack.
- Change costs — how long and how expensive a simple change is today.
- Risk costs — outage exposure and dependence on a few people.
- Opportunity costs — products and integrations that can't be built.
Use your own figures from tickets, invoices and delivery records. A case built on measured costs is far harder to dismiss.