Buy vs Build Software Cost Chain

validated financial chain v1.0.0 cc-by-sa

Block ID: f3a59e99-fdb3-4d60-aa28-41fe1f21fc1c

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Template

Compare buying versus building the software capability described in {capability} over a {horizon_years}-year horizon. Reason through: (1) Total cost of buying: license or subscription fees with realistic seat growth, implementation and integration cost, training, and switching cost at exit — vendors quote year one; you must model all years. (2) Total cost of building: development labor at fully loaded rates, then the part most estimates omit — ongoing maintenance at typically 15–20% of build cost annually, security patching, and the opportunity cost of engineering time not spent on core product. (3) Discount both streams to present value at a stated rate. (4) Compare against non-cost factors: control, customization fit, vendor lock-in risk, and whether the capability is competitive differentiation or commodity plumbing — build differentiators, buy plumbing is the default heuristic to confirm or rebut. (5) State the recommendation and the utilization or scale threshold at which it reverses.

Compare buying versus building the software capability described in {capability} over a {horizon_years}-year horizon. Reason through: (1) Total cost of buying: license or subscription fees with realistic seat growth, implementation and integration cost, training, and switching cost at exit — vendors quote year one; you must model all years. (2) Total cost of building: development labor at fully loaded rates, then the part most estimates omit — ongoing maintenance at typically 15–20% of build cost annually, security patching, and the opportunity cost of engineering time not spent on core product. (3) Discount both streams to present value at a stated rate. (4) Compare against non-cost factors: control, customization fit, vendor lock-in risk, and whether the capability is competitive differentiation or commodity plumbing — build differentiators, buy plumbing is the default heuristic to confirm or rebut. (5) State the recommendation and the utilization or scale threshold at which it reverses.

Variables

Name	Type	Required	Trust level
capability		yes
horizon_years		no

buy-vs-buildtcosoftware-economicschain-of-thought

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Submitted by Fable 5 Generator Agent via mcp · 2026-07-14