SOC 2 vs ISO 27001: Key Differences, Type 1 vs Type 2, and Which Your Buyers Want

01What is the difference between SOC 2 and ISO 27001?

SOC 2 is an attestation: a licensed CPA firm examines your controls and issues a report with its opinion. ISO 27001 is a certification: an independent certification body audits your information security management system (ISMS) and, if it conforms, issues a certificate. SOC 2 is a framework of the American Institute of Certified Public Accountants (AICPA), and licensed CPA firms perform the examination under AICPA attestation standards. The report contains management's description of the system, management's assertion, the auditor's opinion, and, for a Type 2, the tests performed and their results. Because it describes your environment in depth, a SOC 2 report is meant for customers, prospects, and other specified users, usually under NDA. The AICPA also offers SOC 3, a shorter general-use report on the same criteria that you can distribute freely. ISO/IEC 27001 is an international standard published jointly by ISO and the International Electrotechnical Commission. It defines the requirements an ISMS must meet. ISO does not certify anyone. External certification bodies do, and a certificate from an accredited body carries more weight because a national accreditation body has confirmed that body's competence. The certificate names the scope, the standard version, and the validity dates. In practice, a SOC 2 report tells the reader how your controls work and whether the auditor found exceptions. An ISO certificate tells the reader that your management system passed an audit against a fixed set of requirements.

• 01Issued by: SOC 2, a licensed CPA firm. ISO 27001, an independent certification body, ideally an accredited one
• 02Framework owner: SOC 2, the AICPA. ISO 27001, ISO and IEC
• 03What you receive: SOC 2, a detailed report with an auditor's opinion. ISO 27001, a certificate stating scope and validity
• 04Who can see it: SOC 2, specified users, usually under NDA. ISO 27001, the certificate can be shared publicly
• 05What is judged: SOC 2, whether your controls meet the criteria. ISO 27001, whether the management system that selects and runs your controls conforms to the standard

02What do SOC 2 and ISO 27001 actually assess?

SOC 2 assesses your controls against the AICPA Trust Services Criteria. ISO 27001 assesses your ISMS against the standard's mandatory clauses and uses Annex A as a reference list of controls. The Trust Services Criteria are set by the AICPA's Assurance Services Executive Committee. The current version is the 2017 Trust Services Criteria with revised points of focus from 2022. They are organized into five categories: Security, Availability, Processing Integrity, Confidentiality, and Privacy. Security, also known as the common criteria, is in scope for every SOC 2. You add the other categories when they match commitments you make to customers. A company that promises uptime in its contracts might add Availability. A payroll processor might add Processing Integrity. The criteria describe outcomes. You design the controls, and the auditor judges whether they achieve the criteria. ISO/IEC 27001:2022 is the current edition, updated by an amendment in 2024 that added climate action considerations. Its main clauses set out how the management system must work: the organization's context, leadership, risk-based planning, support, operation, performance evaluation, and continual improvement. Annex A lists information security controls grouped into organizational, people, physical, and technological themes, and ISO/IEC 27002 gives implementation guidance for each. You do not have to implement every Annex A control. You select controls through your risk assessment and record the decision for each one, with a justification, in a Statement of Applicability. The auditor checks that the reasoning holds and that the selected controls are in place.

• 01SOC 2 core: the Trust Services Criteria, with Security mandatory and the other categories added by choice
• 02ISO 27001 core: mandatory ISMS clauses covering context, leadership, planning, support, operation, performance evaluation, and improvement
• 03SOC 2 controls: written by you to meet the criteria, with no prescribed control list
• 04ISO 27001 controls: selected through risk assessment, compared against Annex A, and justified in the Statement of Applicability
• 05SOC 2 boundary: a system description prepared against the AICPA description criteria (DC 200)
• 06ISO 27001 boundary: a documented ISMS scope that appears on the certificate

03What is the difference between SOC 2 Type 1 and Type 2?

A SOC 2 Type 1 report covers whether your controls are suitably designed as of a specific date. A Type 2 report covers design and whether the controls operated effectively throughout a defined period, backed by the auditor's tests and their results. A Type 1 is a snapshot. The auditor reads your system description, confirms the controls exist, and assesses whether they would meet the criteria if they operate as described. A Type 2 covers an observation period that you agree with the auditor. Across that period the auditor samples evidence: access reviews performed, change approvals, alerts triaged, backups restored in testing. The report lists each test and any exceptions. This is the report most buying-side security teams want, because it shows how controls perform in practice. Many companies start with a Type 1 to unblock early deals, and buyers who accept one usually expect a Type 2 to follow. A Type 2 cannot be rushed. The observation period has to elapse before the audit concludes, and it only counts once your controls are actually running. ISO 27001 has no Type 1 or Type 2 split. Initial certification is a staged audit: a review of your ISMS documentation and readiness, then a main audit of implementation. After that, the certification body runs surveillance audits during the certificate's validity and a recertification audit at the end of the cycle.

• 01Type 1 question: are the controls suitably designed as of a specific date?
• 02Type 2 question: were the controls suitably designed and operating effectively throughout the period?
• 03Type 1 evidence: system description, walkthroughs, and inspection of control design
• 04Type 2 evidence: records sampled across the whole period, with test results and exceptions

04Which do customers ask for, SOC 2 or ISO 27001?

US customers usually ask for SOC 2. Customers in Europe, the UK, India, the Middle East, and much of Asia-Pacific more often ask for ISO 27001 certification, and your own sales pipeline is the best evidence of which one you need. SOC 2 grew out of the US accounting profession, and US enterprise security and procurement teams are used to reading SOC 2 reports during vendor reviews. A US prospect that receives an ISO certificate will often still send a questionnaire or ask whether a SOC 2 is planned. ISO/IEC 27001 is an international standard, and outside the US it is the more familiar signal in vendor due diligence, enterprise procurement, and public-sector tenders. For an Indian SaaS or IT services company, ISO 27001 is often the first certification enterprise customers name in their security requirements. If that same company starts selling into the US, SOC 2 requests usually follow. Before choosing, pull recent security questionnaires, MSAs, RFPs, and lost-deal notes, and record which framework each one named. That tells you more than any general rule. Buyers also read the two differently. A SOC 2 reviewer checks the period covered, the opinion, any exceptions, which subservice organizations were carved out, and the complementary user entity controls the buyer must operate on its side. An ISO reviewer checks the scope statement, the issuing body, its accreditation, and the validity dates. Certificates from accredited bodies can be looked up in the International Accreditation Forum's CertSearch database.

05Can you get SOC 2 and ISO 27001 at the same time?

Yes. The two frameworks cover much of the same ground, so you can build one control set, map it to both Annex A and the Trust Services Criteria, and collect evidence once for both audits. The AICPA publishes its own mapping between the Trust Services Criteria and ISO 27001. The usual approach is to use the ISO management system as the operating backbone. The ISMS gives you the governance loop that keeps controls alive: a defined scope, a risk assessment, a risk treatment plan, internal audits, and management reviews. SOC 2 does not name those artifacts, but a SOC 2 auditor still looks for risk assessment and monitoring activities under the common criteria, so the ISMS work carries over. Then build a single control library. Each control gets an owner, a description, the evidence it produces, and references to the Annex A controls and Trust Services Criteria it supports. Access reviews, change management, logging and monitoring, vulnerability management, incident response, vendor management, and security awareness training can each satisfy both frameworks with the same evidence. A few things do not overlap cleanly. ISO requires artifacts SOC 2 does not name, such as the Statement of Applicability and management review records. A SOC 2 Type 2 needs evidence across the full observation period, so collection has to run continuously; a scramble before fieldwork leaves gaps. Scope has to line up too. If the ISO certificate covers the whole company and the SOC 2 covers one product, document the mapping so each auditor sees the boundary they are testing.

• 011. Define one scope both audits can share, or document exactly how the scopes differ
• 022. Run the ISO risk assessment and write the risk treatment plan
• 033. Build one control library mapped to Annex A and the Trust Services Criteria
• 044. Automate evidence collection so it covers the whole SOC 2 observation period
• 055. Complete an internal audit and management review before the ISO certification audit

06Should you get SOC 2 or ISO 27001 first?

Get the one your buyers are asking for. If demand is split, build the ISO management system first, map it to the Trust Services Criteria, and add SOC 2 when US deals require it. Neither framework makes you secure on its own. Both assess whether you manage security in a disciplined way, and both auditors look for evidence that you find and fix weaknesses. Penetration test reports, vulnerability scan records, and incident response exercises are common evidence for that.

• 01Selling mainly to US companies: start with SOC 2, using a Type 1 as an early milestone only if a deal needs something before a Type 2 can be completed
• 02Selling mainly in Europe, the UK, India, the Middle East, or Asia-Pacific: start with ISO 27001 certification from an accredited certification body
• 03Selling in both markets: build the ISO ISMS, map controls to the Trust Services Criteria, and run both audits from one evidence set
• 04Buyers want detail on how controls operate: a SOC 2 Type 2 gives them tested results and exceptions
• 05Buyers want a quick, publicly verifiable signal: an accredited ISO 27001 certificate is easier to share
• 06No buyer is asking yet: build controls on the ISO structure, run a gap assessment, and schedule the audit when a deal justifies it

07How Faltrox can help

If you are unsure where you stand, a SOC 2 & ISO 27001 Gap Assessment maps your current controls against the Trust Services Criteria and the ISO 27001 requirements and gives you a prioritized remediation plan. It is the right starting point when you expect to need both, or when you have not yet decided which to pursue. If ISO certification is the target, our ISO 27001 Readiness service builds the ISMS with you: scope, risk assessment, Statement of Applicability, policies, internal audit, and management review. For teams working toward a SOC 2 audit, an ISO certification, or both, Compliance & Certification Readiness covers the wider program: control design, evidence collection, and coordination with your auditor, with our VAPT work available as evidence for vulnerability management. Faltrox prepares you for the audit. The SOC 2 report comes from an independent CPA firm, and the ISO 27001 certificate comes from a certification body you select.