You've got a security questionnaire in your inbox, or a sales deal that's stalled because a prospect needs proof of compliance. Or your CTO just asked "do we need SOC 2 or ISO 27001?" followed closely by "…or both?"

SOC 2 and ISO 27001 are the two most commonly requested security certifications in B2B tech — and two of the most commonly confused. They have different origins, different structures, and different audiences. But there's a significant overlap in what they actually ask you to do.

This guide covers the key differences, where the two frameworks align, and which one you should prioritise first.

What Is SOC 2?

SOC 2 — short for Service Organization Control 2 — is an auditing framework developed by the American Institute of Certified Public Accountants (AICPA). It's designed to assess how service organizations handle customer data, evaluated against five Trust Services Criteria: Security, Availability, Processing Integrity, Confidentiality, and Privacy.

Security is the only mandatory criterion. The others are included depending on the nature of your service and what your customers need demonstrated.

SOC 2 audits come in two forms:

Type I — Assesses the design of your security controls at a specific point in time.
Type II — Evaluates the operating effectiveness of those controls over a defined period, typically six to twelve months.

Type II is what most enterprise customers expect. It's a more comprehensive audit process and carries significantly more weight than Type I.

The output is an attestation report — not a certificate. A licensed CPA firm conducts the audit and produces a detailed report describing your controls and whether they met the relevant criteria during the audit period. It's specific, operational, and focused squarely on the security of customer data.

What Is ISO 27001?

ISO/IEC 27001 is an international standard for Information Security Management Systems (ISMS), published by the International Organization for Standardization. It's been in use since 2005, with the current version updated in 2022.

Where SOC 2 evaluates specific security controls, ISO 27001 requires organisations to establish, implement, and maintain a comprehensive framework for managing information security risks across the business. This includes risk assessment, access control, asset management, incident response, supplier security, business continuity, and continuous improvement — all structured around a formal management system.

ISO 27001 requires organisations to implement all 93 prescribed controls in Annex A. These are mandatory and cannot be selectively applied, which ensures comprehensive management of information security risks rather than a narrowly scoped review.

Certification is issued by an accredited body following a two-stage audit:

Stage 1 — A documentation review to confirm your ISMS is correctly designed.
Stage 2 — An on-site or remote certification audit to verify it's operational and effective.

A successful audit produces a certificate valid for three years, with annual surveillance audits to confirm ongoing compliance. ISO 27001 is internationally recognised and particularly trusted in European enterprise, regulated industries, and public sector procurement.

SOC 2 vs ISO 27001: The Key Differences

	SOC 2	ISO 27001
Origin	US (AICPA)	International (ISO/IEC)
Structure	Trust Services Criteria	Information Security Management System + Annex A controls
Output	Attestation report	Certificate
Primary audience	North American enterprise, SaaS buyers	Global — particularly Europe, regulated sectors
Validity	Report covers a defined period	3-year certificate with annual surveillance audit
Control flexibility	Security mandatory; others are optional	All 93 Annex A controls are required
Cost	Typically £15,000–£50,000+ for Type II	Typically £10,000–£40,000+ depending on scope
Time to certify	6–12 months for Type II	6–18 months

These figures are directional. Your actual cost and timeline will depend on your existing security posture, team capacity, and how much of the process you're managing manually versus through a compliance automation platform.

One commonly cited difference worth flagging: ISO 27001 certification audits tend to be more documentation-intensive than SOC 2, given the requirement to evidence a fully operational information security management system rather than specific point-in-time or period-based controls.

Where SOC 2 and ISO 27001 Overlap

More than most people expect. Research consistently points to around 80% overlap between the criteria of the two frameworks — meaning the security controls, policies, and evidence you build for one directly support the other.

Both frameworks require:

Risk assessment processes and documented risk treatment decisions
Access control policies ensuring only authorized users can reach sensitive data and systems
Incident response procedures and security protocols
Vendor and third-party security management
Internal controls around change management, logging, and monitoring
Security policies that are documented, communicated, and maintained

The overlap means that organisations pursuing one framework are well-positioned to achieve the other. If you build your compliance programme with both in mind from the start — aligning your internal controls, evidence collection, and security policies to cover shared requirements — the second certification becomes significantly less resource-intensive.

FAQ: SOC 2 vs ISO 27001

Do I need SOC 2 or ISO 27001?

That largely depends on your target market and the governance level your customers and regulators expect.

SOC 2 is primarily recognised in North America. If you're a SaaS company selling to US enterprise buyers, SOC 2 Type II is what they're asking for. It's become the standard way to demonstrate responsible handling of customer data in that market.

ISO 27001 is a globally recognised certification, and the preferred standard for organisations with international clients — particularly in Europe. It's widely required in regulated sectors including financial services, healthcare, and government supply chains. For organisations looking to expand internationally, ISO 27001 is often the more portable foundation.

Can you have both SOC 2 and ISO 27001?

Yes, and many scaling organisations do. The two frameworks are complementary rather than competing. ISO 27001 provides the strategic framework for managing information security risks across the organisation; SOC 2 provides operational validation that specific controls are working as intended. Together, they create a more resilient security posture and remove friction across different buyer types and markets.

Which is harder?

Both require meaningful work and neither is a box-ticking exercise. ISO 27001 is typically more demanding in scope — a comprehensive audit process covering the entire information security management system. SOC 2 Type II requires sustained control operation over time, which surfaces any drift between implementation and ongoing maintenance.

Both will identify gaps in your current security controls, which is the point. The question isn't really which is harder — it's which gaps you'd rather find first.

Which is more expensive?

They're broadly comparable, though ISO 27001 certification is often considered more costly due to the documentation requirements for proving a compliant ISMS is in place. SOC 2 auditor fees vary considerably depending on the firm and scope. In both cases, the real cost driver is how much manual effort is going into evidence collection, policy management, and audit preparation — which is where a compliance automation platform makes a measurable difference.

What's the difference between SOC 2 Type I and Type II?

Type I assesses the design of your security controls at a specific point in time. Type II evaluates the design and operating effectiveness of those controls over a period of time — typically six to twelve months. Enterprise customers requesting SOC 2 almost always want Type II, because it demonstrates that your security practices are sustained, not just set up for the audit.

Which Should You Get First?

The honest answer: it depends on where you're selling and who's asking.

Start with SOC 2 if:

Your primary market is North America
Enterprise deals are stalling at the infosec questionnaire stage
You're in SaaS, fintech, or healthtech selling to US buyers
You need to demonstrate compliance quickly for a specific deal or market entry

Start with ISO 27001 if:

You're selling into European enterprise, public sector, or regulated industries
Your customers or partners are explicitly requesting ISO 27001 certification
You're building an information security program designed to scale globally
You want a comprehensive framework that supports regulatory compliance across multiple jurisdictions

Pursue both if:

You have ambitions in both North American and European enterprise markets
You're in a dual-regulated sector — financial services, healthcare SaaS, supply chain
You've achieved one certification and want to expand your compliance status
You're managing the same security work for different customer questionnaires and want to consolidate the effort

The frameworks' significant overlap means that achieving compliance with one substantially reduces the work required for the other. Organisations that plan for dual certification from the start — aligning their security policies, evidence, and risk management processes across both — typically find the second certification considerably faster and less disruptive.

The Harder Part Is Maintaining Compliance

Choosing between SOC 2 and ISO 27001 is, genuinely, the easy part.

The harder part is keeping your security controls operational, your evidence current, and your team ready — not just for the initial certification, but for every compliance audit that follows. Surveillance audits, annual renewals, Type II observation periods — ongoing compliance is where most organisations quietly struggle.

Policies drift. Evidence collection falls behind. Someone changes roles and takes the institutional knowledge with them. The compliance spreadsheet gets deprioritised.

Manual compliance management doesn't scale, and the gaps it creates tend to show up at exactly the wrong moment.

How Hicomply Helps

Hicomply is built around this challenge: keeping your compliance programme operational, evidenced, and audit-ready — across SOC 2, ISO 27001, or both — without the overhead of managing it all manually.

The platform helps you:

Map controls across frameworks so shared security policies and evidence serve multiple certifications
Automate evidence collection and track your compliance status in real time
Maintain continuous improvement between certification cycles rather than scrambling before each audit
Give auditors clean, documented evidence without weeks of last-minute preparation

Whether you're working toward your first certification or managing an ongoing compliance programme across multiple frameworks, the goal is the same: compliance that stays current without consuming your team.

The Bottom Line

SOC 2 and ISO 27001 are different frameworks with different outputs and different primary audiences. SOC 2 is the standard for demonstrating data security to North American buyers; ISO 27001 is the internationally recognised certification preferred in Europe and regulated sectors worldwide.

They're not mutually exclusive — there's substantial overlap in their security controls, risk management requirements, and information security practices. Organisations pursuing both typically find the second significantly more achievable once the first is in place.

The decision comes down to your target market, your customers' expectations, and your long-term compliance goals. Get the sequencing right, build the foundations properly, and ongoing compliance becomes a lot more manageable than it sounds.

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