SOC 2 and ISO 27001 are the two leading information security frameworks: SOC 2 is a US-based attestation report evaluated by a CPA firm against the AICPA Trust Services Criteria, while ISO 27001 is an internationally recognised certification for an Information Security Management System (ISMS) issued by an accredited certification body.
If you're a SaaS company, managed service provider, or any organisation that handles customer data, you've almost certainly been asked: "Do you have SOC 2?" or "Are you ISO 27001 certified?" These two frameworks are the gold standard for demonstrating information security maturity to customers, partners, and regulators — but they're not the same thing, and choosing the right one (or both) depends on your market, your customers, and your strategic goals.
SOC 2 is an attestation report based on the AICPA's Trust Services Criteria, evaluated by a CPA firm. ISO 27001 is an international standard for information security management systems (ISMS), certified by an accredited certification body. Both prove you take security seriously, but they do so in fundamentally different ways.
This guide provides a thorough, practical comparison to help you make the right decision.
Quick Reference
SOC 2
ISO 27001
Full name
Service Organization Control 2
ISO/IEC 27001:2022
Governing body
AICPA (American Institute of CPAs)
ISO/IEC (International Organization for Standardization)
What it is
Attestation report (opinion on controls)
Certification (pass/fail against a standard)
Who issues it
CPA firm (licensed auditor)
Accredited certification body
Geographic preference
Primarily US and North America
Global (especially EU, UK, Asia-Pacific)
Scope
Defined by the service organisation
Defined by the organisation (ISMS scope)
Validity
12-month reporting period (Type II)
3-year certificate with annual surveillance audits
Cost range
$30,000–$150,000 (audit fees)
$15,000–$80,000 (certification fees)
Timeline
3–6 months (Type I); 6–12 months (Type II)
6–12 months (initial certification)
Control framework
Trust Services Criteria (TSC)
Annex A controls (93 controls in 4 themes)
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Public availability
Restricted (shared under NDA)
Certificate is public; audit report is not
Can you display a logo/badge?
No official SOC 2 "badge"
Yes — ISO 27001 certification mark
Key Takeaways
SOC 2 is an attestation report preferred by US customers — it evaluates whether your controls are designed and operating effectively over a period
ISO 27001 is an international certification preferred by European and global customers — it certifies that you have a formal Information Security Management System (ISMS)
SOC 2 focuses on controls for a specific service; ISO 27001 focuses on the management system governing all information security
SOC 2 vs ISO 27001 cost: SOC 2 audit fees are generally higher ($30K–$150K) but ISO 27001 has higher internal implementation costs
Many organisations pursue both — they share roughly 70–80% of their control requirements, making a combined approach cost-effective
If you sell primarily to US enterprise customers, start with SOC 2; if your market is Europe or global, start with ISO 27001; if both, pursue them simultaneously
NIS2 and DORA increasingly reference ISO 27001 as a benchmark for cybersecurity measures — giving ISO 27001 additional regulatory weight in the EU
Neither SOC 2 nor ISO 27001 is "better" — they serve different purposes and different audiences
SOC 2 (Service Organization Control 2) is an attestation framework developed by the AICPA (American Institute of Certified Public Accountants). It evaluates a service organisation's controls relevant to one or more of the Trust Services Criteria:
Trust Services Category
What It Covers
Required?
Security (Common Criteria)
Protection against unauthorised access
Always included
Availability
System uptime and operational performance
Optional — include if availability is important to customers
Processing Integrity
System processing is complete, valid, accurate, timely
Optional — include for data processing services
Confidentiality
Protection of confidential information
Optional — include if you handle confidential (non-personal) data
Privacy
Collection, use, retention, disclosure of personal information
Optional — include if you process personal data under AICPA privacy criteria
SOC 2 Type I vs Type II
Aspect
SOC 2 Type I
SOC 2 Type II
What it evaluates
Design of controls at a point in time
Design AND operating effectiveness over a period (typically 6–12 months)
Audit approach
Control design review
Control design review + testing of operating effectiveness over the period
Value to customers
Moderate — shows controls exist
High — shows controls work consistently over time
Common use
First-time SOC 2; bridge while building towards Type II
Ongoing annual attestation; what customers actually want
Timeline
1–3 months
6–12 months (including observation period)
Best practice: Get a Type I report quickly if customers are asking now, then transition to Type II for the ongoing programme.
What Is ISO 27001?
ISO/IEC 27001:2022 is the international standard for Information Security Management Systems (ISMS). It specifies requirements for establishing, implementing, maintaining, and continually improving an ISMS within the context of the organisation's overall business risks.
Key insight: SOC 2 has higher audit fees but lower internal overhead. ISO 27001 has lower audit fees but requires more internal effort to build and maintain the ISMS. Over a 3-year period, total costs tend to converge.
Timeline Comparison
Side-by-Side Timeline
Month
SOC 2 (starting from zero)
ISO 27001 (starting from zero)
1
Scoping and readiness assessment
Gap analysis and risk assessment
2
Remediation — policies, controls
ISMS design — policies, SoA, controls
3
Remediation continues
Implementation — controls, training
4
Type I audit (optional)
Implementation continues
5
Observation period begins
Internal audit
6
Observation period
Management review; Stage 1 audit
7–8
Observation period
Remediation of Stage 1 findings
9
Observation period
Stage 2 audit
10
Observation period
Certificate issued
11
Type II audit fieldwork
—
12
SOC 2 Type II report issued
—
Bottom line: ISO 27001 certification can be achieved in 6–10 months. SOC 2 Type II (with observation period) typically takes 9–12 months from start, though a Type I can be achieved in 3–4 months.
Which Should You Choose?
Choose SOC 2 If:
Your primary customers are in North America
Your customers specifically ask for SOC 2 reports
You're a SaaS company selling to US enterprise customers
You want to demonstrate control effectiveness over a period
You want flexibility in defining your control framework
Your competitors have SOC 2 and it's a market expectation
Choose ISO 27001 If:
Your primary customers are in Europe, Asia-Pacific, or globally
You need a recognised certification (not just a report)
You want to build a formal management system for information security
You're subject to NIS2, DORA, or other EU regulations that reference ISO 27001
You want a certification badge you can display publicly
You need to demonstrate compliance to multiple stakeholders without sharing a detailed report
Choose Both If:
You sell to both US and European/global customers
You want maximum market coverage and competitive advantage
You're willing to invest in a comprehensive security programme
You want to leverage the 70–80% control overlap for efficiency
Decision Framework
Answer these questions to determine your priority:
#
Question
If Yes →
1
Are >50% of your prospects/customers in the US?
Prioritise SOC 2
2
Are >50% of your prospects/customers in the EU or globally?
Prioritise ISO 27001
3
Do your customers specifically ask for SOC 2 reports?
SOC 2 is needed
4
Do your customers specifically ask for ISO 27001 certification?
ISO 27001 is needed
5
Are you subject to NIS2, DORA, or other EU cybersecurity regulations?
ISO 27001 has strong regulatory alignment
6
Do you need a public-facing certification badge?
ISO 27001 (SOC 2 has no official badge)
7
Is your budget limited and you can only pursue one now?
Start with the one your top 5 prospects require
8
Do you have a mature security programme already?
Both are achievable in parallel
Pursuing SOC 2 and ISO 27001 Together
Many organisations pursue both certifications simultaneously. Here's how to do it efficiently:
The Integrated Approach
Phase
Activities
Duration
1. Unified gap analysis
Assess against both SOC 2 TSC and ISO 27001 Annex A simultaneously
3–4 weeks
2. Integrated control framework
Design controls that satisfy both frameworks; single control can address multiple requirements
4–6 weeks
3. Unified documentation
Policies and procedures written to cover both; one set of evidence for both
4–8 weeks
4. Implementation
Implement controls once; evidence serves both audits
8–12 weeks
5. ISO internal audit
Conduct internal audit (ISO requirement)
2–3 weeks
6. ISO Stage 1 + Stage 2
ISO certification audit
2–4 weeks
7. SOC 2 observation period
Controls operating; evidence accumulating
6–12 months
8. SOC 2 Type II audit
SOC 2 audit using same evidence base
4–8 weeks
Efficiency Gains
Area
Savings from Combined Approach
Policy development
Write once, map to both → 50% less documentation effort
Control implementation
Implement once, test against both → 60% less implementation effort
Evidence collection
One evidence repository serves both audits → 40% less evidence gathering
Audit management
Coordinate auditors; provide same evidence → 30% less audit overhead
Overall cost
Combined is typically 30–40% cheaper than doing both independently
Practical Tips for Combined Programmes
Start with ISO 27001 as the foundation — its management system requirements (risk assessment, internal audit, management review) strengthen the overall programme
Use a single GRC platform to map controls to both frameworks
Coordinate audit timing — schedule your ISO certification audit first, then begin the SOC 2 observation period
Select an ISO certification body that also has a CPA partnership or vice versa — some firms can facilitate both
Create a unified control matrix showing how each control satisfies both SOC 2 TSC and ISO 27001 Annex A requirements
How SOC 2 and ISO 27001 Map to Each Other
Control Mapping Summary
SOC 2 Common Criteria Area
ISO 27001 Clause/Control
Overlap
CC1.1–1.5: Control environment
Clause 5 (Leadership), A.5.1 (Policies)
High
CC2.1–2.3: Communication
Clause 7.4, A.5.1
High
CC3.1–3.4: Risk assessment
Clause 6.1, 8.2 (Risk assessment)
High
CC4.1–4.2: Monitoring
Clause 9 (Performance evaluation)
High
CC5.1–5.3: Control activities
Annex A (various)
High
CC6.1–6.8: Access controls
A.5.15–A.5.18, A.8.2–A.8.5
Very high
CC7.1–7.5: System operations
A.8.15–A.8.16, A.5.24–A.5.28
High
CC8.1: Change management
A.8.32
Very high
CC9.1–9.2: Risk mitigation
Clause 6.1, Annex A
High
Overlap estimate: Approximately 70–80% of controls satisfy both frameworks.
SOC 2 and ISO 27001 in the Context of EU Regulations
If you operate in the EU or serve EU customers, understanding how these certifications interact with EU regulations is important:
Regulation
SOC 2 Recognition
ISO 27001 Recognition
GDPR
Accepted as evidence of "appropriate technical and organisational measures" but not sufficient alone
Recognised as strong evidence of compliance; EDPB references it frequently
NIS2
Not specifically referenced
Explicitly referenced as a relevant cybersecurity standard; may satisfy some Art. 21 requirements — see our NIS2 vs ISO 27001 guide for a detailed comparison
DORA
Accepted as evidence for ICT risk management
Referenced as a relevant standard for ICT risk management; recommended by ESAs
EU AI Act
Not referenced
ISO 42001 (AI management system) aligned with ISO 27001 structure
eIDAS 2.0
Not referenced
Referenced for trust service providers
Key takeaway: In the EU regulatory context, ISO 27001 carries significantly more weight than SOC 2. If EU compliance is a priority, ISO 27001 should be your foundation.
Common Myths Debunked
#
Myth
Reality
1
"SOC 2 is harder than ISO 27001"
Neither is inherently harder — they test different things. SOC 2 tests control effectiveness over time; ISO 27001 tests management system maturity.
2
"ISO 27001 means you're secure"
ISO 27001 certifies that you have a management system for security — it doesn't guarantee you won't be breached. The same applies to SOC 2.
3
"SOC 2 is only for US companies"
SOC 2 originated in the US but is increasingly accepted globally. However, ISO 27001 remains more widely recognised outside North America.
4
"You need to choose one or the other"
Many organisations pursue both. The 70–80% overlap makes this efficient.
5
"SOC 2 Type I is worthless"
Type I is a legitimate stepping stone — it shows your controls exist even if you haven't demonstrated them over time yet. Many customers accept Type I while you work towards Type II.
6
"ISO 27001 requires you to implement all 93 controls"
ISO 27001 requires you to consider all 93 controls and justify any exclusions in your Statement of Applicability. You only implement the controls that are relevant to your risks.
7
"Once certified, you're done"
Both require ongoing effort — SOC 2 needs an annual audit; ISO 27001 has annual surveillance audits and a triennial recertification.
8
"Automated compliance platforms eliminate the need for an auditor"
Platforms like Vanta, Drata, and Sprinto streamline evidence collection but cannot replace the audit itself. You still need a CPA firm (SOC 2) or certification body (ISO 27001).
Frequently Asked Questions
Can a SOC 2 report substitute for ISO 27001 certification?
No. They are different frameworks with different purposes. A SOC 2 report demonstrates that specific controls are designed and operating effectively, while ISO 27001 certifies that you have a management system for information security. Some customers will accept one in lieu of the other, but they are not interchangeable — particularly in EU regulatory contexts where ISO 27001 carries more weight.
How long does each certification last?
A SOC 2 Type II report covers a specific observation period (typically 12 months). Customers expect a new report annually. An ISO 27001 certificate is valid for 3 years, with annual surveillance audits to maintain it. Both require ongoing compliance — letting your SOC 2 report lapse or failing a surveillance audit can lose your certification/attestation.
Which is more expensive?
Over a 3-year period, total costs (including internal effort, consulting, tools, and audit fees) tend to be similar: approximately $150K–$500K depending on company size and complexity. SOC 2 has higher annual audit fees ($30K–$150K/year); ISO 27001 has higher implementation costs but lower annual certification fees ($8K–$25K/year for surveillance). If you pursue both simultaneously, the combined cost is 30–40% less than pursuing each independently.
Do I need both for enterprise sales?
It depends on your market. US enterprise sales typically require SOC 2. European enterprise sales typically require ISO 27001. Global enterprise sales increasingly expect both. If budget is limited, start with the certification your top prospects require, then add the other within 12 months.
What's the difference between SOC 1 and SOC 2?
SOC 1 reports on controls relevant to financial reporting — it's used by service organisations whose services affect their clients' financial statements (e.g., payroll processors, financial data hosting). SOC 2 reports on controls relevant to security, availability, processing integrity, confidentiality, and privacy. Most technology companies need SOC 2, not SOC 1.
Can startups realistically achieve SOC 2 or ISO 27001?
Yes. Many startups achieve SOC 2 Type II within 6–9 months and ISO 27001 within 6–12 months. Automated compliance platforms (Vanta, Drata, Sprinto, Secureframe) have significantly reduced the effort required for startups with cloud-native infrastructure. The investment typically pays for itself quickly by unblocking enterprise deals.
How do automated compliance platforms help?
Platforms like Vanta, Drata, Sprinto, and Secureframe automate evidence collection from your cloud infrastructure (AWS, Azure, GCP), HR systems, identity providers, and code repositories. They continuously monitor your control status, alert you to gaps, and streamline the evidence-sharing process with auditors. They typically reduce the internal effort by 40–60% but do not eliminate the need for policies, risk assessments, and the audit itself.
What happens if we fail an audit?
For SOC 2: the CPA firm may issue a qualified opinion or note exceptions in the report. This isn't necessarily fatal — many organisations have exceptions in their first report and remediate for the next period. For ISO 27001: the certification body may issue major or minor non-conformities. Minor NCOs must be resolved within a defined timeframe. Major NCOs may prevent certification until resolved. Neither framework has a public "fail" — but auditors will not issue a clean report/certificate until findings are addressed.
Related Resources
ISO 27001 Implementation Guide — Complete guide to achieving ISO 27001 certification, from gap analysis to Stage 2 audit
Virtual CISO Guide — How a virtual CISO can manage your SOC 2 and ISO 27001 programmes
The SOC 2 vs ISO 27001 decision isn't about which is better — it's about which serves your market, your customers, and your strategic goals. US-focused SaaS companies should prioritise SOC 2. Global or EU-focused companies should prioritise ISO 27001. Companies serving both markets should pursue both, leveraging the significant control overlap for efficiency.
Whichever you choose, the investment in a rigorous security programme pays dividends beyond the certificate or report: fewer breaches, faster sales cycles, stronger customer trust, and a security culture that protects your business for the long term.
Need SOC 2 or ISO 27001? Vision Compliance guides organisations through both certifications — from gap analysis to audit-ready programmes. We specialise in combined SOC 2 + ISO 27001 implementations that minimise cost and time. Schedule a free consultation →
Robert Lozo, mag. iur., is a Partner at Vision Compliance specializing in EU regulatory compliance. He advises organizations on GDPR, NIS2, AI Act, and financial regulation, delivering audit-ready documentation and compliance roadmaps across regulated industries.
