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How to Evaluate and Vet Suppliers for Your Supply Chain

Finding reliable suppliers is one of the most critical — and under-systematized — parts of running a product business. The cost of a bad supplier relationship shows up in late shipments, quality escapes, and cash tied up in unusable inventory. Here's how to build a repeatable process for supplier evaluation.

China vs. India vs. Nearshore: Choosing a Sourcing Region

China offers the broadest manufacturing capability across nearly all product categories, established logistics infrastructure, and the deepest supplier ecosystem. However, lead times of 30–60 days plus transit add 45–75 days to replenishment cycles. Tariffs on Chinese goods (Section 301 tariffs, currently 7.5–25% on many product categories) have meaningfully increased landed costs since 2018.

India is the dominant sourcing region for textiles, pharmaceuticals, agricultural products, chemicals, and auto components. India offers competitive labor costs and a growing manufacturing ecosystem, particularly in electronics and machinery. English is widely used in business, simplifying communication.

Mexico (nearshoring) has grown significantly as US companies diversify away from China. Proximity reduces transit time to 3–7 days (vs. 20–35 days ocean). The USMCA trade agreement eliminates or reduces tariffs on most goods. Ideal for products where responsiveness to demand changes matters more than lowest unit cost.

US domestic suppliers offer the shortest lead times, no customs complexity, and "made in USA" marketing rights. Unit costs are typically higher, but when you factor in reduced inventory carrying costs (from shorter lead times allowing smaller safety stock), the total cost difference narrows significantly.

Key Supplier Evaluation Criteria

When vetting a new supplier, evaluate these factors before placing a production order:

• Certifications: ISO 9001 (quality management), BSCI/SA8000 (labor standards), relevant industry certifications (FDA registration for food/pharma, CE marking for EU, etc.)
• Minimum Order Quantity (MOQ): Ensure their MOQ aligns with your inventory strategy. A supplier with a $50K MOQ is the wrong partner for a $500K/year business.
• Lead time reliability: Ask for their on-time delivery rate for the past 12 months. Best-in-class is above 95%.
• Payment terms: Standard China terms are 30% deposit, 70% before shipment. Better terms come with relationship history or letters of credit.
• Quality control process: Do they have in-house QC? Will they allow third-party inspections (AQL inspections) before shipment?
• Financial stability: Request 2–3 years of financials for large suppliers. A supplier going out of business mid-order is a supply chain emergency.

Using Inventory Data to Set Supplier Requirements

Before approaching suppliers, use SupplyChainStack's Safety Stock Calculator to determine your reorder point and safety stock requirements. This tells you the maximum lead time you can tolerate without stocking out at your target service level. It also determines your ideal order frequency and quantity, which directly informs your MOQ requirements and helps you negotiate from a position of informed specificity rather than guesswork.