Supplier Audits: Guide and Checklist

A supplier quality audit is an essential process for any factory looking to keep its supply chain solid and meet international regulatory requirements. In a globalized market, where raw materials and inputs come from different countries and customers are increasingly demanding, having reliable, audited suppliers becomes a matter of survival and competitiveness.

It isn't just about checking whether a supplier delivers on time or honors contracts. Auditing means thoroughly examining how they work, what controls they apply, how they manage product traceability, and whether they meet recognized standards such as ISO 9001, ISO 14001, ISO 22000, IFS or BRCGS. This level of control ensures that what arrives at the factory meets the quality and safety requirements end customers demand.

In this article we'll look at what a supplier audit is, why it matters so much to factories, the key steps for carrying one out, the challenges that typically come up, and how digitization is turning the supplier quality audit into a faster, more effective process.

What a supplier quality audit is

A supplier quality audit is a systematic, documented review carried out on supply chain partners to verify that they meet the quality, safety, sustainability and regulatory compliance criteria the factory requires.

In practice, it involves reviewing:

• The supplier's production processes.
  
• Document management: certificates, records, procedures.
  
• Traceability systems for raw materials and finished products.
  
• Compliance with international standards such as ISO, IFS or BRCGS.
  
• Safety and environmental controls.
  

The goal isn't to penalize, but to make sure the supplier is capable of delivering products that are consistent, safe and compliant with what was agreed.

Why auditing suppliers matters

Factories tend to focus on their own internal quality processes, but they forget that the chain starts outside their walls. A defective raw material can ruin an entire production batch or even trigger a health crisis. That's why the supplier quality audit is so crucial.

Risks of not auditing suppliers

• Production issues: defective raw materials cause stoppages or rework.
  
• Problems in external audits: if the supplier doesn't comply with standards, the factory can lose certifications.
  
• High costs: returns, claims, waste.
  
• Reputational damage: in sectors like food, a supplier failure can end in a product recall.
  

Benefits of auditing suppliers

• Regulatory compliance assurance across the whole chain.
  
• Reduced operational and legal risk.
  
• Greater trust from customers and business partners.
  
• A strategic relationship with suppliers, built on continuous improvement.
  

The audit isn't an isolated external control — it's a tool for strengthening the factory's global competitiveness.

Types of supplier audit

Within the framework of the supplier quality audit, there are several approaches depending on the objective:

1. Initial or approval audit: carried out before working with a new supplier to make sure they meet minimum requirements.
   
2. Periodic audit: scheduled reviews of active suppliers to check they're maintaining standards.
   
3. Follow-up audit: after detecting non-conformities, this checks that corrective actions have been applied correctly.
   
4. Regulatory compliance audit: focuses on verifying that the supplier complies with local and international regulations.
   

Each type responds to a different need, but all of them aim to strengthen the reliability of the supply chain.

Steps for carrying out a supplier quality audit

An effective supplier quality audit must follow a structured process. Here are the fundamental steps:

1. Define evaluation criteria

Before auditing, the factory must set the parameters it will assess. These can be based on:

• ISO 9001, ISO 22000, IFS, BRCGS standards.
  
• Specific contractual requirements.
  
• Sustainability or environmental indicators.
  

2. Audit planning

• Select the audit team.
  
• Set dates, duration and scope.
  
• Communicate the objectives and requirements to the supplier.
  

3. Carrying out the audit

• Document review: certificates, procedures, records.
  
• Site visit: observe processes, hygiene, safety.
  
• Staff interviews: check training levels and quality culture.
  
• Traceability check: follow a batch from raw material to finished product.
  

4. Recording findings

Every observation must be documented with objective evidence: photos, documents, records, interviews.

5. Final report

The report should include:

• Conformities.
  
• Major and minor non-conformities.
  
• Improvement recommendations.
  

6. Corrective action plan

The supplier must submit a plan with owners, deadlines and concrete measures to fix the issues found.

7. Follow-up

The supplier quality audit doesn't end with the report. Following up is essential to make sure the changes are actually implemented.

The most relevant international standards in supplier audits

In a supplier quality audit, the most common reference frameworks are:

• ISO 9001 (quality management): requires documented processes and continuous improvement.
  
• ISO 14001 (environmental management): assesses environmental impact and legal compliance.
  
• ISO 22000 (food safety): establishes traceability and hazard control.
  
• IFS (International Featured Standards): heavily required across the European distribution chain.
  
• BRCGS (Brand Reputation Compliance Global Standard): guarantees product safety and trust.
  

Each standard brings specific requirements that must be verified during the audit.

Common challenges in supplier audits

Although the supplier quality audit is essential, it also faces difficulties:

• Supplier resistance to being audited.
  
• Lack of internal resources to run periodic audits.
  
• Excessive manual documentation.
  
• Difficulty consolidating evidence quickly and clearly.
  

Overcoming these challenges takes preparation, a culture of collaboration, and support from the right technology.

Digitization: the future of supplier audits

Digitization is turning the supplier quality audit into a faster, more reliable process. Instead of relying on paper, folders and scattered emails, factories can:

• Use customizable digital checklists.
  
• Capture evidence on the plant floor with real-time photos and videos.
  
• Share automatic reports with suppliers instantly.
  
• Centralize audit history on a secure platform.
  
• Cut preparation time by up to 70%.
  

The difference is clear: while a manual system creates inefficiency and errors, digitization delivers traceability and trust.

How Solved makes supplier audits easier

The Solved platform is designed to simplify every process related to the supplier quality audit. Some of its key features include:

• Digital checklists adaptable to ISO, IFS and BRC.
  
• Real-time issue and finding logging.
  
• Digital evidence (photos, videos, documents).
  
• Automatically assigned corrective actions with owners and deadlines.
  
• Tracking dashboards showing the status of audits and open non-conformities.
  

With Solved, factories can move from slow, manual audits to agile, collaborative processes that are ready for any certification.

Conclusion

A supplier quality audit isn't just bureaucratic paperwork: it's the tool that ensures the entire supply chain operates at the same level of rigor the factory applies to itself. Auditing suppliers means reducing risk, guaranteeing regulatory compliance, and strengthening trust with customers and markets.

The future of these audits lies in digitization. With tools like Solved, companies achieve full traceability, automatic reports and smooth collaboration with suppliers. That way, the audit stops being a drain on time and becomes a competitive advantage.

Want to audit your suppliers more efficiently and ensure regulatory compliance across your entire supply chain? Request a Solved demo and discover how to turn your supplier quality audit into an efficient, digital process.