SOC 2 and ISO 27001 both show up in enterprise security reviews, but they serve different markets and produce different outputs. This article explains what each one actually requires, how they compare, and how to decide which to pursue first.
What is SOC 2?
The audit covers up to five Trust Services Criteria. Security is mandatory. The others are included based on your product and what you've committed to in customer contracts:
- Security. Required for every audit. Covers access controls, encryption, and protection against unauthorized access.
- Availability. Relevant if you have uptime commitments in customer contracts.
- Processing Integrity. Applies when you process transactions or data on behalf of customers. Common in fintech.
- Confidentiality. Covers protection of trade secrets, proprietary data, or other designated confidential information.
- Privacy. Included when you collect or process personal information governed by your privacy notice.
There are two report types. Enterprise buyers typically require Type II:
| Type I | Type II | |
|---|---|---|
| What it covers | Controls at a single point in time | Controls over a 6-12 month observation period |
| Auditor opinion | Controls are suitably designed | Controls are designed and operating effectively |
| Timeline | Weeks | 6-12 months minimum |
| Weight with buyers | Proof of intent, sometimes a bridge report | The standard expectation for mature products |
Some companies get a Type I report first to satisfy near-term requests while the Type II observation period runs in parallel. It works as a short-term bridge, but most large enterprise buyers will eventually require Type II.
What is ISO 27001?
Unlike SOC 2, ISO 27001 is built around an ongoing management system, not a point-in-time audit. Annex A defines 93 controls across four themes:
- Organizational. Policies, roles, supplier management, incident response, business continuity.
- People. Hiring checks, security training, disciplinary processes, remote work controls.
- Physical. Building access, equipment security, clean desk, secure destruction of media.
- Technological. Access control, encryption, vulnerability management, secure development. Annex A.8.8 is the primary driver for pentest requirements.
First certification typically takes 8-18 months. Most of that time is spent writing policies, running risk assessments, and building the evidence library before the auditor arrives.
Key Differences
The most important difference isn't cost or timeline. It's geography. SOC 2 opens doors in the US. ISO 27001 opens doors everywhere else.
| SOC 2 | ISO 27001 | |
|---|---|---|
| Output | Auditor report (shared under NDA) | Certificate (publicly visible) |
| Where it matters | US enterprise sales | Europe and international markets |
| Who audits you | Licensed CPA firm | Accredited certification body |
| How often | Annual re-audit for Type II | 3-year cert, annual surveillance |
| Pentest | Not required; expected by auditors | Required under Annex A.8.8 |
| Cost | $15k-$60k+ | $20k-$80k+ |
| Timeline | Type I: weeks; Type II: 6-12 months | 8-18 months to first certificate |
Which Should You Choose?
The decision usually comes down to where your buyers are located and what they ask for in vendor reviews.
Start with SOC 2 if:
- Your customers are US enterprises sending SOC 2 requests in vendor reviews.
- A contract is blocked pending a compliance report.
- You are raising a Series A or B and investors or customers want security evidence.
Start with ISO 27001 if:
- You are selling into Europe, the Middle East, or Asia-Pacific, where ISO 27001 is the baseline expectation.
- Your buyers are in financial services, healthcare, government, or defense.
- You need a public-facing credential that does not require sharing reports under NDA.
Many companies eventually pursue both. The control sets overlap significantly, so work done for one reduces the effort for the other. The typical sequence is SOC 2 Type II first, then ISO 27001 as international sales grow.
Where Penetration Testing Fits In
SOC 2
Penetration testing is not required by the standard, but auditors reviewing CC6.6 (logical access from outside the system boundary) and CC7.1 (malicious software detection) will look for evidence those controls work in practice. A pentest report is the most straightforward way to provide that evidence. Most auditors treat it as standard for any production SaaS system.
ISO 27001
Annex A.8.8 requires identifying, assessing, and remediating technical vulnerabilities. A pentest report with documented findings and remediation is the standard form of evidence. Certification auditors will ask for it, and the absence of one requires a strong compensating explanation.
In both cases, schedule the test before your audit window opens. Findings remediated before the auditor reviews your controls are a cleaner story than findings discovered during the audit.
Preparing for SOC 2 or ISO 27001?
Pentra runs web, API, cloud, and network assessments with a structured report built for auditors. We cover the evidence your SOC 2 CPA and ISO 27001 certification body will ask for, and we work around your timeline so findings are remediated before your audit window opens.
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