SOC 2 vs ISO 27001

Security is often a deciding factor when businesses choose a service provider. Before sharing sensitive data or signing a contract, customers want to know how their information will be protected. This is why many organizations are asked to provide a SOC 2 report or ISO 27001 certification as proof of their security practices.

While both SOC 2 and ISO 27001 help businesses demonstrate their commitment to information security, they serve different purposes. SOC 2 assesses the controls a service organization uses to protect its systems and customer data, while ISO 27001 focuses on building and maintaining an effective information security management system.

Understanding the differences between SOC 2 and ISO 27001 can help businesses choose the right approach based on their security needs, customer expectations, and compliance goals.

What Is SOC 2?

SOC 2 (System and Organization Controls 2) is an assurance reporting framework. It is developed by the American Institute of Certified Public Accountants (AICPA) to help service organizations validate how their controls address security and other relevant trust-related requirements. It is particularly relevant to businesses that provide cloud-based services, software platforms, managed IT services, and outsourced technology solutions.

For example, consider a SaaS company that stores sensitive customer information. A prospective enterprise customer may want evidence that the company restricts unauthorized access, monitors security events, and protects customer data.

The Five SOC 2 Trust Services Categories

SOC 2 examinations use applicable criteria from five Trust Services Categories:

• Security: Protects systems and information against unauthorized access and other security risks.

• Availability: Ensures systems are available for operation and use as committed or agreed.

• Processing Integrity: Ensures system processing is complete, valid, accurate, timely, and authorized.

• Confidentiality: Protects information designated as confidential.

• Privacy: Addresses the collection, use, retention, disclosure, and disposal of personal information according to relevant commitments and criteria.

Security is the common category included in SOC 2 examinations. The remaining categories are selected based on the organization’s services, commitments, and reporting objectives.

What Is ISO 27001?

ISO/IEC 27001 is the international benchmark for building and maintaining an Information Security Management System (ISMS). It provides an organized approach to identifying, assessing, treating, and monitoring information security risks.

Unlike SOC 2, which results in an assurance report, ISO 27001 allows organizations to obtain formal certification from an independent certification body. The standard is suitable for organizations across industries, including healthcare, finance, manufacturing, education, technology, and professional services.

You can also explore the articles: 

• Benefits of ISO/IEC 27001 Compliance for Organizations
• ISO 27001 Internal Audit Techniques

How Does ISO 27001 Work?

ISO 27001 requires an organization to establish an ISMS that fits its business environment, information assets, and security risks. This involves:

• Identifying information security risks and deciding how to treat them.
• Establishing security policies, responsibilities, and objectives.
• Selecting appropriate controls based on risk assessment.
• Training employees and improving security awareness.
• Monitoring performance, conducting internal audits, and reviewing the ISMS.
• Taking corrective action and continually improving information security practices.

You can also explore the articles: 

• How to Create an Information Security Policy for ISO 27001?
• How to Perform a Gap Analysis for ISO 27001?

SOC 2 vs ISO 27001: Key Differences

Although SOC 2 and ISO 27001 share similar security objectives, they differ in purpose, assessment methods, and scope.

SOC 2 and ISO 27001: 6 Major Differences

1. Purpose and Security Approach

SOC 2 and ISO 27001 approach information security from different angles.

SOC 2 focuses on whether relevant controls meet the applicable Trust Services Criteria.

ISO 27001 takes a management-system approach. It requires organizations to identify security risks, establish policies, assign responsibilities, implement appropriate controls, and continually improve their ISMS.

2. Certification vs Attestation

One of the most misunderstood differences between SOC 2 and ISO 27001 is the final outcome. 

SOC 2 does not provide a certification. A qualified CPA firm performs an examination and issues an attestation report.

ISO 27001, on the other hand, supports formal third-party certification following an assessment against the standard.

This distinction matters when responding to customer questionnaires. Saying a company is “SOC 2 certified” is technically incorrect. The appropriate wording is that the organization has obtained a SOC 2 Type 1 or Type 2 report.

3. Security Controls and Requirements

SOC 2 uses applicable Trust Services Criteria to assess a company’s security controls. Businesses can choose and design controls based on their services, as long as they meet the relevant criteria.

ISO 27001 contains formal ISMS requirements and a reference set of Annex A security controls. Organizations must use a documented risk assessment and risk treatment process to determine the controls they need.

4. Audit and Assessment Process

SOC 2 audits are carried out by independent CPA firms. For a Type 2 report, auditors check whether the company’s security controls have been working effectively over a set period.

ISO 27001 certification generally follows a two-stage initial audit process.

• Stage 1: The auditor reviews the organization’s ISMS documentation, scope, and readiness.
• Stage 2: The auditor evaluates how the ISMS has been implemented and whether it conforms to the standard’s requirements.

After certification, surveillance audits typically take place annually, with recertification before the end of the three-year cycle.

Neither assessment should be viewed as a one-time security project.

5. Costs and Implementation Effort

Is SOC 2 cheaper than ISO 27001?

Not necessarily. The cost depends on several factors:

• Company size and business operations
• Existing security policies and controls
• Number of employees, systems, and locations covered
• Security gaps that need to be fixed
• Auditor or certification fees
• Staff time and ongoing compliance costs

Companies that already have strong security controls, clear policies, and proper documentation may spend less time and money preparing for an audit. Those starting from scratch may need more time and investment.

SOC 2 Type 2 also requires sufficient evidence across the defined examination period, while ISO 27001 requires an operational ISMS and ongoing management activities.

6. Reporting and Sharing Evidence

SOC 2 reports explain which security controls were audited, how they were tested, and what the auditors found. Since these reports may include sensitive company information, they’re usually shared only with customers and other authorized parties.

ISO 27001 certificates are simpler. They confirm that a company is certified and show what the certification covers. However, some customers may ask for additional documents to better understand the company’s security practices.  

The takeaway is that both approaches support transparency, but they provide different kinds of assurance evidence.

SOC 2 vs ISO 27001: Which One Is Better for Your Business?

The right choice depends on what your organization does, who its customers are, and which security expectations it must satisfy.

Choose SOC 2 When

• Your company provides SaaS, cloud, or managed technology services
• Enterprise customers regularly request a SOC 2 report
• You need detailed independent assurance about specific service controls
• Your contracts or procurement processes require SOC 2 Type 2 reporting
• Your immediate priority is demonstrating the operation of security controls for a defined service

Choose ISO 27001 When

• You want to establish a formal, organization-wide security management approach within a defined scope
• Your company serves customers across multiple international markets
• You need a structured process for assessing and treating information security risks
• Customers or tenders require internationally recognized ISMS certification
• Your goal is to embed continuous information security improvement into business operations

Consider Both When

• Your organization operates globally and serves enterprise customers with different assurance requirements
• Your customers explicitly request both forms of evidence
• You want a mature ISMS and detailed independent assurance over key services
• Your security team can use a common control and evidence program to support both assessments

For many growing technology companies, the most practical strategy is to start with the framework customers require now while developing controls that can support the other framework later.

Common Mistakes to Avoid

Even organizations with mature technical controls can encounter difficulties during SOC 2 or ISO 27001 preparation.

Some common mistakes include:

• Treating Compliance as a Checklist: Having policies is not enough if employees don’t follow them or controls aren’t operating.
• Confusing SOC 2 Reports with Certifications: SOC 2 is an attestation engagement, not a certification scheme.
• Assuming all ISO 27001 Annex A Controls are Mandatory: Control selection must reflect risk treatment decisions, with appropriate justifications recorded.
• Ignoring Assessment Scope: A report or certificate only supports conclusions about the activities and systems covered.
• Preparing Evidence at the Last Minute: Recreating historical approvals, reviews, or monitoring records can be difficult or impossible.
• Assuming Compliance Guarantees Security: Neither framework eliminates cyber risk. Security remains an ongoing responsibility.

The organizations that gain the most value from these frameworks are usually the ones that integrate security practices into day-to-day operations instead of treating assessments as annual paperwork exercises.

Conclusion

Choosing between SOC 2 and ISO 27001 comes down to your business needs and what your customers expect. SOC 2 helps show that your security controls are working as intended, while ISO 27001 focuses on how your company manages information security risks.

SOC 2 is a good fit if clients want proof that your security controls work. ISO 27001 is worth considering if you need internationally recognized certification. If your customers ask for both, you can work toward both. What matters most is keeping your data secure, meeting customer expectations, and building trust over time.

How Can InfosecTrain Help?

Looking to strengthen your knowledge of SOC 2, ISO 27001, and security compliance? InfosecTrain can help you take your skills to the next level with expert-led training, practical insights, and guidance from experienced industry professionals.

Whether you’re an aspiring GRC professional, IT Auditor, Compliance Manager, or Cybersecurity Expert, InfosecTrain’s training programs help you understand security frameworks, manage risk, and build the skills to handle real-world compliance challenges.

Explore our industry-focused training programs:

• ISO 27001 Lead Implementer Training
• GRC IT Audit Hands-on Training
  

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