Supplier Audit Checklist [FREE PDF]

Supplier audits are a cornerstone of supply chain quality management, required under ISO 9001:2015 Clause 8.4 to ensure that externally provided processes, products, and services conform to specified requirements. IATF 16949:2016 Clause 8.4.1.2 further mandates that organizations develop and implement a supplier monitoring process including quality performance metrics, on-time delivery, and second-party audit results. This comprehensive supplier audit checklist enables Supplier Quality Engineers

• Industry: Manufacturing QA
• Frequency: Annually
• Estimated Time: 3-5 hours
• Role: Supplier Quality Engineer
• Total Items: 40
• Compliance: ISO 9001:2015 Clause 8.4 - Control of Externally Provided Processes, Products and Services, IATF 16949:2016 Clause 8.4.1.2 - Supplier Selection Process, AS9100 Rev D Clause 8.4.3 - Information for External Providers, ISO 9001:2015 Clause 9.2 - Internal Audit Requirements Applied to Supplier Audits, Six Sigma DMAIC - Measure Phase Supplier Capability Assessment

Quality Management System Overview

Assess the supplier's quality management system structure, certifications, and overall quality culture.

• Does the supplier hold a current, valid ISO 9001:2015 or equivalent QMS certification?
• Has the supplier defined and documented their Quality Policy and Quality Objectives?
• Is the supplier's quality manual or equivalent documented information available and current?
• Has senior management demonstrated active commitment to quality improvement initiatives?
• What is the supplier's current QMS certification scope?

Document Control & Record Management

Evaluate the supplier's systems for controlling documents, engineering changes, and quality records.

• Does the supplier have a documented procedure for controlling quality documents and records?
• Are engineering drawings, specifications, and customer requirements at the current approved revision?
• Is there a formal engineering change management process with customer notification requirements?
• Are quality records retained for the required retention period per regulatory and customer requirements?
• Are obsolete documents removed from points of use and clearly identified to prevent unintended use?

Manufacturing & Process Control

Assess the adequacy of the supplier's production controls, process documentation, and mistake-proofing methods.

• Does the supplier maintain current control plans for all products supplied to your organization?
• Are process parameters monitored using Statistical Process Control (SPC) or equivalent methods?
• Are poka-yoke (mistake-proofing) devices in place for critical operations and verified at the start of each shift?
• Are work instructions for critical operations available at the point of use and used by operators?
• Is there a process for identifying and controlling special/critical characteristics throughout production?
• What is the supplier's current Overall Equipment Effectiveness (OEE) score for key production equipment?

Measurement Systems & Calibration

Evaluate the adequacy and control of the supplier's measurement systems, gauges, and test equipment.

• Does the supplier maintain a calibration system with a complete register of all measurement equipment?
• Are calibration records current and stickers/labels affixed to all gauges showing due dates?
• Has Measurement System Analysis (MSA) / Gauge R&R been conducted for critical measurement systems?
• Are out-of-calibration events documented with an impact assessment on previously measured product?
• Is test equipment used for customer-specific testing traceable to national metrology institute standards?

Nonconformance Management & Corrective Action

Review the supplier's processes for identifying, controlling, and resolving nonconformances and customer complaints.

• Does the supplier have a documented nonconformance reporting (NCR) process with defined roles and timelines?
• Are corrective actions implemented using a structured root cause analysis methodology (8D, 5-Why, Fishbone)?
• Is there evidence that corrective actions have been verified for effectiveness after implementation?
• What is the supplier's PPM (Parts Per Million defect rate) for shipments to your organization in the past 12 months?
• Does the supplier conduct lessons-learned reviews and apply corrective actions horizontally to similar processes?

Sub-Tier Supplier & Supply Chain Management

Evaluate how the supplier manages its own supply chain, sub-tier suppliers, and externally sourced materials.

• Does the supplier maintain an approved supplier list (ASL) with defined qualification criteria?
• Does the supplier flow down applicable regulatory, customer, and statutory requirements to sub-tier suppliers?
• Is there a receiving inspection process to verify incoming material conformance before production use?
• Are Certificates of Conformance (CoCs) and material test reports received and verified for all critical materials?
• Does the supplier have counterfeit part prevention controls for electronic components or regulated materials?

Workforce Competency & Training

Assess the supplier's programs for ensuring personnel are competent to perform quality-affecting work.

• Does the supplier maintain documented training records for all personnel performing quality-critical operations?
• Are personnel performing special processes (welding, soldering, NDT) certified to applicable standards?
• Is there a process for identifying training needs and evaluating the effectiveness of training delivered?
• Are quality awareness programs in place to communicate the importance of conformance to all employees?

Audit Summary & Supplier Scoring

Capture overall audit findings, risk assessment, and recommended supplier approval status.

• What is the total number of major nonconformances identified during this audit?
• What is the total number of minor nonconformances or observations identified during this audit?
• What is the recommended supplier approval status based on this audit?
• Has the supplier acknowledged the audit findings and agreed to the corrective action timeline?
• Provide a summary of key strengths, major findings, and overall audit conclusions?

Related Quality Assurance Checklists

• Corrective Action Verification Checklist [FREE PDF]
• Calibration Due Date Audit Checklist [FREE PDF]
• SPC Control Chart Review Inspection Checklist [FREE PDF]
• Non-Conformance Report Review Inspection Checklist [FREE PDF]

Why Use This Supplier Audit Checklist [FREE PDF]?

This supplier audit checklist [free pdf] helps manufacturing qa teams maintain compliance and operational excellence. Designed for supplier quality engineer professionals, this checklist covers 40 critical inspection points across 8 sections. Recommended frequency: annually.

Ensures compliance with ISO 9001:2015 Clause 8.4 - Control of Externally Provided Processes, Products and Services, IATF 16949:2016 Clause 8.4.1.2 - Supplier Selection Process, AS9100 Rev D Clause 8.4.3 - Information for External Providers, ISO 9001:2015 Clause 9.2 - Internal Audit Requirements Applied to Supplier Audits, Six Sigma DMAIC - Measure Phase Supplier Capability Assessment. Regulatory-aligned for audit readiness and inspection documentation.

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