Short answer: Pick the one your customers ask for. SOC 2 is an attestation report issued by a licensed CPA firm under AICPA standards; it’s the default expectation for SaaS and service providers selling to U.S. companies. ISO/IEC 27001 is an international certification of your information security management system (ISMS), issued by an accredited certification body; it’s more common when you sell to international, European, or enterprise buyers. The two overlap heavily, so if you’ll eventually need both, build one control set and map it to each.
What’s the core difference?
| ISO/IEC 27001 | SOC 2 | |
|---|---|---|
| What it is | Certification of an information security management system | Attestation report on controls at a service organization |
| Who issues it | Accredited certification body | Licensed CPA firm, under AICPA standards |
| What you get | A certificate (pass/fail) plus a defined scope | A detailed report with the auditor’s opinion, your system description, and the tests performed |
| Basis | ISO/IEC 27001 clauses 4–10 plus Annex A controls (93 in the 2022 edition), chosen by risk | AICPA Trust Services Criteria: Security (required), plus optional Availability, Processing Integrity, Confidentiality, and Privacy |
| Strongest in | International and enterprise markets | U.S. market, especially SaaS and technology services |
| Shareability | Certificate can be shared publicly | Report is usually shared under NDA |
The practical difference: ISO 27001 proves you run a management system that identifies and treats risk and keeps improving. SOC 2 gives a customer’s reviewer a detailed report on specific controls and whether they worked.
SOC 2 Type 1 vs. Type 2
SOC 2 comes in two report types:
- Type 1 reports on whether your controls are suitably designed at a point in time.
- Type 2 reports on whether controls were designed and operated effectively over a period, often several months up to a year.
Most customers who ask for “your SOC 2” mean a Type 2. A Type 1 can be a useful first step to show progress while the Type 2 observation period runs.
How does ISO 27001 certification work?
You build and run an ISMS: define scope, assess risk, select controls from Annex A (documented in a Statement of Applicability), write policies, train staff, run an internal audit, and hold a management review. An accredited certification body then audits you in two stages. Certification is maintained through periodic surveillance audits and recertification, so the system has to keep running after the certificate is issued.
Which one do your customers want?
Start with the source of the request. Read the security questionnaire, the contract clause, or the procurement checklist. It usually names the standard.
| Situation | Usually expected |
|---|---|
| U.S. SaaS or managed service selling to U.S. companies | SOC 2 Type 2 |
| Customers or parent companies in Europe, the Middle East, or Asia | ISO 27001 |
| Large enterprise buyer with a global supplier program | Either; check their vendor requirements |
| Defense contractor handling CUI | Neither replaces CMMC and NIST SP 800-171 |
| Healthcare data | Neither replaces the HIPAA Security Rule (see HIPAA security risk assessment) |
If a customer will accept either, consider which one helps with your next five customers, not just this one. And ask whether a completed questionnaire plus a security packet will do for now (see how to answer security questionnaires).
How much overlap is there?
A lot. Both expect risk assessment, access control, change management, logging and monitoring, vendor management, incident response, business continuity, and security awareness. Work that typically carries over:
- Risk assessment and a maintained risk register
- The core policy set (see information security policy template)
- Vendor management process and records (see vendor risk management)
- Evidence of access reviews, onboarding and offboarding, backups, and incident handling
What doesn’t carry over automatically: ISO 27001’s management-system requirements (internal audit, management review, Statement of Applicability, continual improvement) and SOC 2’s system description and observation period.
What drives the cost and timeline?
There are no fixed numbers. Cost depends on:
- Scope. One product and one cloud environment is far easier than several business units and offices.
- Starting maturity. Existing policies and working controls shorten preparation.
- Criteria selected. For SOC 2, each optional Trust Services Category adds testing.
- Report type and period. A SOC 2 Type 2 needs an observation period before the report can be issued.
- Audit firm. Fees vary by firm, scope, and industry.
For ISO 27001 specifically, see ISO 27001 certification cost.
Can you do both?
Yes, and many organizations do. The efficient path is to build one control framework, run it, and map it to both. Plan the scopes so they match where possible, and line up evidence collection so the same records support both audits.
Frequently Asked Questions
Is SOC 2 a certification?
No. SOC 2 is an attestation report. A licensed CPA firm examines your controls and issues an opinion. People often say “SOC 2 certified,” but the accurate term is a SOC 2 report or SOC 2 attestation.
Is ISO 27001 harder than SOC 2?
They are hard in different ways. ISO 27001 requires a full management system with internal audits and management reviews. SOC 2 Type 2 requires proof that controls operated over a period. Starting maturity matters more than the choice of standard.
Does ISO 27001 replace SOC 2 for U.S. customers?
Sometimes. Some U.S. buyers accept an ISO 27001 certificate; others specifically require a SOC 2 report. Ask before you commit.
Can USCIBER issue our SOC 2 report or ISO 27001 certificate?
No. SOC 2 reports are issued by licensed CPA firms, and ISO 27001 certificates by accredited certification bodies. USCIBER helps you get ready: scoping, gap assessment, policies, controls, and evidence.
How USCIBER can help
USCIBER’s ISO 27001 consulting draws on hands-on ISO 27001 implementation experience to scope your ISMS, run the gap assessment, and build the risk process, policies, and Statement of Applicability. ISO 27001 projects are scoped after a call. For SOC 2 readiness, a Security & Risk Assessment (from $6,500) shows where you stand against the Trust Services Criteria. A vCISO can carry the program through the audit. See all supported standards on Frameworks We Support.
Sources
- AICPA & CIMA — SOC 2: SOC for Service Organizations: Trust Services Criteria
- AICPA — 2017 Trust Services Criteria (with revised points of focus)
- ISO — ISO/IEC 27001:2022 Information security management systems — Requirements
This article is general information, not legal advice.