Why Software Development Cost Estimation Matters
The success or failure of a software project starts with accurate cost estimation. According to industry research, roughly 34% of domestic SW projects exceed their initial budget by over 20%, primarily due to flawed cost estimation.
Ultimately, the ability to calculate a fair price determines your project's success rate.
Key Changes in 2026 SW Cost Estimation Standards
Updated KOSA Function Point Unit Price
The 2026 Function Point (FP) unit price is ₩605,784 (approximately $418), a 3.6% increase from the prior year. This reflects rising labor costs for SW engineers—application developers now average ₩7.75M/month ($5,345) and system developers ₩5.84M/month ($4,028).
New AI Solution Cost Estimation Guidelines
Starting in 2026, dedicated adjustment factors for AI/ML projects have been introduced. Training data volume, model complexity, and GPU infrastructure costs are now separate line items, with recommended correction factors of 1.3–1.8× over standard FP calculations.
Public Sector vs. Private Sector Differences
| Criteria | Public Sector | Private Sector |
|----------|--------------|----------------|
| Basis | Government SW Pricing Guide | Open negotiation |
| FP Unit Price | ₩605,784 (published rate) | Market rate (±20% variance) |
| Profit Margin | Capped at 25% | Negotiable |
| Correction Factors | 7 mandatory items | Applied selectively |
Practical Guide to Function Point Analysis
The 5-Step FP Estimation Process
Quick Screen-Based Estimation vs. Detailed FP Analysis
In early project stages, a quick estimation method is more practical:
We recommend a two-phase approach: quick estimation for initial budgeting, then detailed FP validation before contract signing.
Applying Correction Factors
Real-world projects require multiplying the unadjusted FP by several correction factors:
Cost Comparison: Outsourcing vs. Subscription vs. In-House
Let's compare costs for the same 30-page B2B SaaS platform (estimated 300 FP):
| Category | Traditional Outsourcing | Subscription Dev | In-House (Full-Time) |
|----------|------------------------|-----------------|---------------------|
| Initial Build | ~$124,000 | $400–820/month | ~$16,000×3 staff/mo |
| Timeline | 4–6 months | 3–6 months | 3–5 months |
| Annual Maintenance | ~$18,600 (15%/yr) | $130–270/month | Ongoing salaries |
| 3-Year TCO | ~$179,000 | ~$22,700 | ~$234,000 |
| Code Ownership | Varies by contract | 100% client-owned | 100% company-owned |
The subscription model eliminates heavy upfront investment by distributing costs monthly—particularly advantageous for startups and new business units. On a 3-year TCO basis, it delivers up to 87% savings compared to traditional outsourcing.
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