SOC 2 vs ISO 27001: Key Differences and How to Choose (2026)

Key Takeaways

• SOC 2 is more common in the US. ISO 27001 carries more weight internationally.
• ISO 27001 results in a formal certification. SOC 2 produces an attestation report, not a certificate.
• According to the AICPA, there is roughly 80% overlap between SOC 2 and ISO 27001 control requirements.
• ISO 27001 audits are typically 1.5 to 2 times more expensive than SOC 2 audits.
• SOC 2 is more flexible. ISO 27001 is more prescriptive and covers a broader scope.
• Getting both is common for companies growing into global markets.

Introduction

A prospect asks for your security report before signing the contract. Do you hand them a SOC 2 report or an ISO 27001 certificate?

Both signal that your company takes data protection seriously. But they are not the same thing, and choosing the wrong one can cost you deals and time.

Here is what you actually need to know.

What Are SOC 2 and ISO 27001?

Before comparing the two, it helps to understand what each one actually is.

SOC 2, or Service Organization Control 2, was created by the American Institute of Certified Public Accountants (AICPA). [Internal link: Learn more in our full SOC 2 guide.] It measures how well a company protects customer data across five areas: security, availability, processing integrity, confidentiality, and privacy. Security is the only required one. The rest are optional depending on your business.

The result of a SOC 2 audit is an attestation report. Not a certificate. That distinction matters, and we will come back to it.

ISO 27001, formally known as ISO/IEC 27001:2022, is published jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). [Internal link: See our ISO 27001 compliance breakdown.] It sets out the requirements for building an Information Security Management System, or ISMS. Think of it as a full blueprint for how your company handles information security, not just a snapshot of your controls at one point in time.

The result here is an actual certification, recognized across borders.

SOC 2 vs ISO 27001: The Differences That Actually Matter

These two frameworks share a lot of ground. The AICPA found roughly 80% overlap between the two. But the differences between them are significant enough to change which one you should pursue first.

Scope

ISO 27001 looks at your entire information security management system. It covers 93 prescribed controls in Annex A (organized into 4 themes: organizational, people, physical, and technological controls), and organizations must document why any control does not apply to them in a Statement of Applicability (SoA).

SOC 2 is narrower and more flexible. Depending on which Trust Services Criteria you choose (Security is mandatory; Availability, Processing Integrity, Confidentiality, and Privacy are optional), companies typically implement between 70 and 150 controls. You design the system around your own services. That makes it more flexible, but it also means two companies can have very different SOC 2 programs.

Certification vs Attestation

ISO 27001 gives you a certificate. It is a formal document issued by an accredited registrar, valid for three years with annual surveillance audits.

SOC 2 gives you an attestation report from a licensed CPA firm. There is no such thing as a SOC 2 certificate – a critical distinction that matters during vendor due diligence, as the report itself contains detailed findings and auditor opinions that clients review. Clients and prospects receive the report itself, which explains what was tested and the auditor’s opinion on whether controls were effective.

Geographic Reach

SOC 2 is the standard in the United States. Most US companies, especially SaaS businesses, will ask for a SOC 2 Type 2 report during vendor due diligence.

ISO 27001 is the preferred standard internationally, especially in Europe. If your customer base is outside North America, ISO 27001 will carry more weight.

Audit Types

SOC 2 has two types:

• Type 1 reviews your controls at a single point in time. Preparation takes around 3 months. Average cost is $10,000 to $20,000.
• Type 2 reviews how controls operated over a period of 6 to 12 months. Preparation takes about 4 months. Average cost is $30,000 to $60,000.

ISO 27001 has a two-stage audit process. Stage 1 (documentation review) verifies your ISMS documentation is complete and aligned with the standard. Stage 2 (certification audit) tests whether your controls are actually implemented and operating effectively. Preparation typically takes around 4 months, and the full process can run 6 months. Average certification cost lands between $10,000 and $50,000. Because of the broader scope, ISO 27001 can cost 1.5 to 2 times more than a comparable SOC 2 audit.

Renewal

SOC 2 Type 2 reports are typically renewed annually. ISO 27001 certificates last 3 years, with annual surveillance audits and a full recertification every third year.

Flexibility

SOC 2 lets you choose which Trust Services Criteria to include beyond the mandatory Security criterion. ISO 27001 is prescriptive – all 93 Annex A controls must be addressed, though you can exclude controls that genuinely don’t apply with documented justification. Every organization following it must address the same set of requirements, regardless of size or industry. If a control does not apply, you have to formally justify the exclusion in a Statement of Applicability.

Who Conducts the Audit

SOC 2 audits must be done by a licensed CPA firm. ISO 27001 certifications require an accredited certification body (registrar). In the US, these are typically accredited by the ANSI National Accreditation Board (ANAB).

Which One Does Your Business Actually Need?

This comes down to three things: your customers, your market, and your current security maturity.

Choose SOC 2 if:

• Most of your customers are in the US
• You are a SaaS company in the early to mid-growth stage
• You want a faster path to compliance
• You want flexibility to scope the audit around your actual services
• Clients are asking for a security report during vendor reviews

Choose ISO 27001 if:

• You have customers in Europe or other international markets
• Your clients or prospects are explicitly requesting it
• You want to build a comprehensive, documented ISMS from scratch
• You plan to expand globally and want a credential that holds up anywhere
• Your enterprise clients expect a formal certification rather than a report

Choose both if:

• You serve customers across the US and internationally
• You are scaling into enterprise sales where both may be required
• You want the strongest possible signal to clients about your security program

Getting one makes the other easier. Because there is around 80% overlap between the two frameworks, companies that already have one in place are significantly closer to qualifying for the other. Some auditing firms will even offer a discount if you pursue both at the same time.

A few questions worth asking before you decide:

• Are your customers in the US or internationally?
• Are clients actually requesting a specific framework?
• Do you already have documented security policies and controls in place?
• What does your sales pipeline look like, and what is blocking deals right now?

That last one is often the most honest way to answer the question.

What SOC 2 and ISO 27001 Have in Common

For all their differences, these two frameworks share the same core goals.

Both require an external audit by a qualified third party. Both cover the fundamentals of data security: confidentiality, availability, and integrity. Both take months to complete and demand serious documentation. Neither one is legally required by default, but both send a strong signal to clients, partners, and investors that your data practices are solid.

Neither standard goes without consequence if it lapses. SOC 2 reports are updated annually. ISO 27001 certificates require surveillance audits every year and a full recertification every three years.

Because of how much the two frameworks overlap, obtaining one puts you in a much stronger position for the other. If you have already built a solid ISMS for ISO 27001, a significant portion of the SOC 2 work is already done. And vice versa.

Both help companies:

• Build credibility with enterprise customers
• Pass security questionnaires during vendor due diligence
• Identify weak points in their current security systems
• Stay ahead of regulatory requirements in their industry

FAQs

Conclusion

SOC 2 and ISO 27001 are both strong signals that your company takes security seriously. They just speak to different audiences.

If your customers are mostly in the US, start with SOC 2. If you are selling internationally or into enterprise markets, ISO 27001 gives you a credential that holds up globally. And if you are serious about building a long-term security program that can handle both, planning for both from the beginning is worth it.

The work you put into one directly supports the other. Start wherever your customers and your pipeline are pointing you, then build from there.

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