What is the difference between ISO 27001 and SOC 2?

ISO 27001 is an international certification standard managed by the ISO that requires you to build and certify an Information Security Management System (ISMS). SOC 2 is a US-origin attestation report from an independent CPA firm that tests whether specific security controls operated effectively. ISO 27001 results in a certificate valid for 3 years with annual surveillance audits. SOC 2 results in a report typically renewed annually. ISO 27001 is internationally recognized; SOC 2 is dominant in North America.

Do I need ISO 27001 or SOC 2?

It depends on where your customers are. If you sell primarily to US companies, SOC 2 is what they will ask for. If you sell to European enterprise customers or governments, ISO 27001 is often required. If you sell globally, you may need both. Many companies start with SOC 2 for US deals and add ISO 27001 when they expand to Europe or enterprise government procurement.

Is ISO 27001 harder than SOC 2?

ISO 27001 is generally broader in scope and more prescriptive. It requires a formal ISMS with documented management processes, risk treatment plans, Statement of Applicability, and internal audit programs. SOC 2 is more narrowly scoped to the Trust Service Criteria you select. ISO 27001 implementation typically takes longer, but the two share a significant overlap in underlying controls.

Can SOC 2 replace ISO 27001?

No. SOC 2 and ISO 27001 are recognized by different audiences. A SOC 2 report will not satisfy an enterprise procurement team that requires ISO 27001 certification, and vice versa. They have different structures, different auditors, and different recognition in different markets. They do share control overlap, which means having one makes getting the other significantly faster.

How long does ISO 27001 certification take?

Most startups reach ISO 27001 certification in 4 to 12 months, depending on size, existing security posture, and how much of the ISMS already exists. The process involves gap assessment, ISMS implementation, internal audit, a Stage 1 documentation review, and a Stage 2 audit by an accredited certification body.

ISO 27001 vs SOC 2: which one do you actually need?

You are building a SaaS product, enterprise buyers are asking for security certification, and you are trying to figure out whether to pursue ISO 27001, SOC 2, or both. The answer depends almost entirely on who your customers are and where they are located.

ISO 27001 vs SOC 2: framework comparison

This guide explains what each standard actually requires, who asks for which, and how to decide without wasting 12 months pursuing the wrong one.

What they are at a fundamental level

SOC 2 (Service Organization Control 2) is a US-origin attestation framework managed by the AICPA. An independent CPA firm audits your security controls against the Trust Service Criteria and issues a report, not a certificate, covering a specific period. SOC 2 reports are renewed annually.

ISO 27001 is an international standard managed by the International Organization for Standardization. A certification body accredited by an ISO-recognized body audits your Information Security Management System (ISMS) against the standard's requirements and issues a certificate valid for three years, with annual surveillance audits in years two and three.

The fundamental difference: SOC 2 is a report about specific controls. ISO 27001 is a certification of your security management system, the policies, processes, people, and technology you use to manage information security holistically.

Who asks for each

SOC 2 is required by:

US enterprise companies (especially tech companies doing vendor security reviews)
US financial services firms assessing cloud vendors
US healthcare organizations (often alongside HIPAA)
Investors and boards requesting security attestation for US portfolio companies
US government agency procurement (alongside FedRAMP at higher levels)

ISO 27001 is required by:

European enterprise buyers and governments
UK public sector procurement
APAC enterprise buyers (especially in Singapore, Japan, Australia)
Multi-national companies with centralized security procurement
Companies seeking to meet EU NIS2 Directive requirements
Any organization where "internationally recognized certification" is the explicit requirement

If you look at your current pipeline and it is 90% US-based B2B SaaS deals, do SOC 2 first. If you have significant European or APAC pipeline, or if you are selling into government procurement globally, you need to think about ISO 27001, potentially in parallel.

What each standard actually requires

SOC 2 requirements

SOC 2 is structured around Trust Service Criteria (TSC). The Security category is mandatory; others are optional:

CC1, Control environment: Policies, org structure, code of conduct, background checks
CC2, Communication: Security awareness training, policy communication
CC3, Risk assessment: Formal risk assessment process, risk register
CC4, Monitoring: Internal audit, control monitoring
CC5, Control activities: Logical access controls, encryption, change management
CC6, Logical access: MFA, access provisioning/deprovisioning, privileged access management
CC7, System operations: Monitoring, alert response, incident management
CC8, Change management: SDLC, code review, deployment controls
CC9, Risk mitigation: Vendor management, business continuity

For a startup, a Security-only SOC 2 Type 2 report covers roughly 60 to 90 controls depending on your auditor's interpretation and your system description.

ISO 27001 requirements

ISO 27001 requires you to implement an ISMS, a management system for information security. The standard has two main parts:

Clauses 4–10 are mandatory management system requirements:

Clause 4: Understanding context and interested parties
Clause 5: Leadership and commitment, information security policy
Clause 6: Risk assessment and risk treatment planning
Clause 7: Competence, awareness, communication, documentation
Clause 8: Operational planning and control
Clause 9: Performance evaluation, internal audit, management review
Clause 10: Nonconformity and corrective action

Annex A contains 93 controls across 4 domains (in ISO 27001:2022):

5: Organizational controls (37 controls)
6: People controls (8 controls)
7: Physical controls (14 controls)
8: Technological controls (34 controls)

You must produce a Statement of Applicability declaring which Annex A controls you have implemented and justifying any exclusions. Auditors will test a sample of your implemented controls during the Stage 2 audit.

The overlap between them

The good news: SOC 2 and ISO 27001 share significant control overlap. If you have implemented SOC 2 controls correctly, you have done 60-70% of the work for ISO 27001:2022. The major areas of overlap:

Area	SOC 2 criteria	ISO 27001 controls
Access management	CC6.1–CC6.3	5.15–5.18, 8.2–8.5
Incident response	CC7.3–CC7.5	5.24–5.28
Change management	CC8.1	8.32
Risk management	CC3.1–CC3.4	Clause 6
Vendor management	CC9.1	5.19–5.22
Business continuity	A criteria	5.29–5.30

ISO 27001 requires additional work in areas SOC 2 does not emphasize: physical security controls, formal ISMS documentation, internal audit program, management review meetings, and asset inventory for all information assets.

Which to do first

Start with SOC 2 if:

Your primary market is North America
Your near-term deals (next 6 months) are requiring it
You are a SaaS company selling to tech-forward buyers
You have limited compliance resources and need to close deals now

Start with ISO 27001 if:

You have significant European pipeline or are planning European expansion
Your buyers are government organizations
You need a certificate (not just a report) for specific procurement requirements
Your enterprise customers are multi-national with centralized security requirements

Do both in parallel if:

You are already doing SOC 2 and can allocate the additional resources
Your pipeline is mixed US and European
You want to use the control overlap to be efficient, ISO 27001 work counts toward SOC 2 and vice versa

Maintaining both frameworks without doubling your team's overhead means mapping shared evidence to each one and keeping it current, the kind of program a fractional CISO runs end to end. Book a call to see how the two frameworks overlap for your stack.

The certification vs attestation distinction

One practical difference: ISO 27001 results in a certificate issued by an accredited certification body. That certificate has a name on it, an expiry date, and can be verified publicly. Many procurement databases accept it automatically.

SOC 2 results in a report: a PDF, that you share under NDA with prospects and customers. The report covers a specific period and you typically update it annually. It cannot be publicly verified the way a certificate can.

For some procurement contexts (especially public sector), the ability to verify certification status without receiving a confidential document is a significant advantage of ISO 27001.

Cost comparison

SOC 2 Type 2: $20,000 to $60,000 per year for audit fees, plus tooling and labor. See the full SOC 2 cost breakdown.

ISO 27001 certification: Initial certification audit typically $15,000 to $40,000. Year 1 surveillance audit: $5,000 to $15,000. Year 2 surveillance audit: same. Recertification audit (year 3): similar to initial certification. Plus implementation costs for the ISMS documentation and controls.

Companies that pursue both in parallel typically spend 30-40% more than doing one alone, not 2x, because the control overlap means shared evidence and shared tooling.

Want a security leader to run this?

Xorabyte is a fractional CISO for startups who can review your cloud for the gaps found first, so a blocked deal or an audit stops being your problem to carry alone. Book a call and you will leave with a clear path, not a sales pitch.