FINANCIAL SIMULATOR
Build vs. Buy 3-Year TCO Calculator
Engineering estimates consistently understate downstream maintenance costs. Model initial engineering salaries, 3-year maintenance burdens (typically 20%/year), and vendor licensing fees to discover your true economic breakeven.
1. In-House Engineering Assumptions (Build)
Loaded salary for dedicated team
Industry standard: 15% - 25% of upfront build cost per year
2. Commercial Vendor Assumptions (Buy)
TCO OUTPUT • 36 MONTHS
RECOMMENDATION: BUY
Total 3-Year Build Cost:
$224,000
• Upfront Build:
$140,000
• 3-Year Maintenance:
$84,000
Total 3-Year Buy Cost:
$156,000
Net Financial Advantage:
$68,000
Breakeven Horizon:
Vendor costs remain persistently lower
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