SOC 2 vs ISO 27001: Which Compliance Framework Does Your Business Need?

SOC 2 and ISO 27001 are two of the most recognised security compliance frameworks — but they serve different purposes and audiences. Choosing the wrong one wastes time and money. This guide helps you decide.

What is ISO 27001?

ISO 27001 is an international standard published by the International Organization for Standardization (ISO). It specifies requirements for establishing, implementing, maintaining, and continually improving an Information Security Management System (ISMS).

• Recognised globally — especially in Europe, Asia, Middle East, and Australia
• Certification lasts 3 years with annual surveillance audits
• Prescriptive — requires implementation of specific controls from Annex A
• Any organisation can achieve it regardless of industry

What is SOC 2?

SOC 2 is an auditing standard created by the American Institute of Certified Public Accountants (AICPA). It evaluates how a service organisation handles customer data across five Trust Service Criteria: Security, Availability, Processing Integrity, Confidentiality, and Privacy.

• Dominant in the USA — required by most US enterprise clients
• Two types: SOC 2 Type I (point-in-time) and SOC 2 Type II (6–12 month period)
• Flexible — you choose which criteria apply to your service
• Primarily relevant to SaaS companies and technology service providers

Side-by-Side Comparison

FactorISO 27001SOC 2 |--------|-----------|-------| OriginInternational (ISO/IEC)USA (AICPA) RecognitionGlobalPrimarily USA Best forAny industrySaaS, cloud, tech services OutputCertificateAudit report Validity3 years (annual review)1 year (Type II) Timeline4–12 months6–18 months AuditorAccredited certification bodyLicensed CPA firm Prescriptive?Yes (Annex A controls)Flexible (choose criteria)

Which One Should You Choose?

Choose ISO 27001 if:

• Your clients or contracts are primarily in Europe, India, Middle East, or Asia-Pacific
• You're going through enterprise RFPs that ask for "international security certification"
• You want a structured ISMS that improves your internal security operations

Choose SOC 2 if:

• Your target market is the USA and your prospects ask for SOC 2 reports
• You're a SaaS company selling to US enterprises
• Your product touches sensitive customer data and US clients need proof of controls

Get both if:

• You sell globally across the US and international markets
• You're pursuing enterprise deals in multiple geographies
• Many companies pursue ISO 27001 first, then layer SOC 2 on top since ~70% of the controls overlap

Cost and Timeline

ISO 27001:

• Preparation: 4–9 months (SME)
• Certification audit: £3,000–£15,000 depending on company size
• Ongoing surveillance: £2,000–£5,000/year

SOC 2 Type II:

• Preparation: 6–12 months
• Audit cost: $20,000–$80,000 (US CPA firm)
• Annual renewal required

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Need help deciding which framework is right for your business? Book a free compliance consultation with NadahWeb's certified compliance team.