ISO 27001 vs SOC 2: Which One for Your SaaS?

What Are They?

Both ISO 27001 and SOC 2 are frameworks to prove you secure customer data. But they are fundamentally different things.

ISO 27001 is an internationally recognized standard for an Information Security Management System (ISMS). You get certified by an accredited body. It requires you to define a scope, assess risks, implement controls, and undergo surveillance audits.

SOC 2 (Service Organization Control 2) is an audit report based on the Trust Services Criteria. It is issued by a CPA firm. You choose which criteria to include (security, availability, processing integrity, confidentiality, privacy). Most SaaS companies get a SOC 2 Type II report covering a minimum of 6 months of operations.

Certification vs. Report

ISO 27001 gives you a certificate that lasts three years, with annual surveillance audits. It proves you have a management system in place.

SOC 2 gives you a report that is valid for the audit period (usually 6-12 months). There is no certificate. You share the report with customers under NDA. The report describes controls and tests performed by the auditor.

For many buyers, a SOC 2 report is sufficient. But some international clients or government contracts require ISO 27001 certification.

Cost and Timeline

For a typical SaaS startup (10-50 employees):

• SOC 2 Type II: $30k-$80k for the first audit, plus $10k-$30k annually. Timeline: 6-9 months (including the 6-month observation period).
• ISO 27001: $40k-$100k for certification, plus $10k-$20k annual surveillance. Timeline: 9-18 months.

SOC 2 is generally cheaper and faster. But costs vary based on your complexity and auditor.

Scope and Flexibility

ISO 27001 requires you to define an ISMS scope (e.g., your product or a specific feature). You must implement all Annex A controls (or justify exclusions). It is prescriptive about risk assessment and management.

SOC 2 lets you choose which Trust Services Criteria to include. Most startups only need the Security criterion (common criteria). You can exclude others. The controls are more flexible, based on your system description.

If you need to cover many types of data (PHI, PII, financial), SOC 2 may be easier to tailor.

Which Do Customers Want?

US enterprises overwhelmingly ask for SOC 2. It is standard for SaaS vendors selling to mid-market and Fortune 500 companies.

European and Asian clients often ask for ISO 27001. Some government contracts require it.

If you sell globally, you may eventually need both. Many startups start with SOC 2 to close early deals, then add ISO 27001 within 12-18 months.

Maintenance and Renewal

ISO 27001 requires annual surveillance audits (every 12 months) and a recertification every three years. You must maintain your ISMS and update risk assessments.

SOC 2 reports are issued annually. You can choose to get a new report each year. There is no certification to maintain, but you need to keep controls in place.

Both require ongoing effort. Many startups use compliance automation tools (like Vanta, Drata) to streamline evidence collection.

Which Should You Choose First?

For most SaaS startups, SOC 2 is the better first step. It is faster, cheaper, and directly addresses what US buyers want. You can get a SOC 2 Type II report within 6-9 months.

If your target market includes Europe, Asia, or regulated industries, plan for ISO 27001 later. Some startups pursue both simultaneously to save time.

Whichever you choose, start building security controls early. Use a penetration test to validate your security posture. Start a free scan with Kyro to find vulnerabilities before your audit.