Marginal Cost of Software Squads
Know exactly what the next squad costs before you hire it.
Finance · 3 min
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Squad $ = (Base × 1.35) × HC + Infra + EM overhead + Opportunity cost
- Inputs
- Base comp · Headcount · Infra/eng/yr · Seeding-lead displacement
- Output
- Annual marginal $ per squad + break-even ARR bar
- When to use
- When finance says 'too many engineers per dollar of ARR'.
- Replaces
- Base-salary-only headcount models that under-count cost 2–3×.
Most engineering orgs price headcount at base salary. The real marginal cost of a squad is 2.4x to 3.1x that number once you load benefits, equipment, infrastructure, management overhead, and — critically — the opportunity cost of pulling a tech lead off existing work.
The components
Fully-loaded comp (1.35x base). Infra and tooling per engineer ($8–$22K/year). Management overhead (1 EM per 7 ICs). Opportunity cost of the seeding lead (their displaced output for 3–6 months).
Why CFOs cut squads
When the marginal cost is opaque, finance defaults to a heuristic: 'too many engineers per dollar of ARR.' Showing the per-squad NPV against a specific roadmap outcome reframes the conversation.
The break-even bar
A new squad needs to generate roughly 4–6x its annual marginal cost in incremental ARR or saved cost within 18 months to clear most boards' bar.