Điều khoản leo thang giá (price escalation) trong hợp đồng dài hạn B2B — cách xây dựng?

**Price Escalation Clause — các hình thức:**

**1. CPI-linked escalation:**

"Annual fee shall be adjusted on each anniversary date by the percentage change in Vietnam CPI for the preceding 12 months, as published by General Statistics Office."

• Ưu: khách hiểu và accept dễ (market-based)
• Nhược: CPI VN dao động (2022: 3.15%, 2023: 3.25%)

**2. Fixed annual escalation:**

"Annual service fee shall increase by 5% on each contract anniversary."

• Ưu: predictable cho cả hai bên
• Nhược: cứng, có thể conflict nếu inflation cao hơn 5%

**3. Cost-component escalation (professional services):**

Phân tích thành phần: labor cost (60%) + parts (30%) + overhead (10%)

Escalation = 60% × labor index change + 30% × parts price change + 10% fixed

• Ưu: accurate reflection of actual costs
• Nhược: phức tạp, cần định nghĩa indices rõ

**4. No escalation + renewal renegotiation:**

Fix price cho 2-3 năm, fresh negotiation khi renew

• Ưu: đơn giản
• Nhược: rủi ro INCAS bị squeeze nếu costs tăng mạnh

**Contract language mẫu:**

"The Annual Service Fee for Years 2-5 shall be calculated by multiplying the Year 1 fee by (1 + CPI Rate), where CPI Rate is the official Vietnam CPI annual rate for the preceding calendar year, subject to a minimum of 3% and a maximum of 8%."

→ Floor 3% bảo vệ INCAS, ceiling 8% bảo vệ khách.