If you're a SaaS founder fielding security questionnaires from enterprise prospects, you've probably heard both terms thrown around interchangeably. They're not interchangeable. SOC 2 and ISO 27001 solve overlapping problems in different ways, and picking the wrong one first can cost you months and tens of thousands of dollars.
The short answer
If most of your customers are US-based and enterprise sales is your near-term priority, start with SOC 2. If you're selling internationally, especially into Europe, or a customer explicitly asks for ISO 27001, start there instead. Many companies eventually get both — the question is just which one unlocks revenue faster.
What each one actually is
SOC 2 is an attestation, not a certification. An independent CPA firm audits your controls against the AICPA's Trust Services Criteria (security, availability, confidentiality, processing integrity, privacy) and issues a report. There's no pass/fail certificate — you get a detailed report that customers' security teams read directly.
ISO 27001 is a certification. You build an Information Security Management System (ISMS), get audited by an accredited certification body, and — if you pass — receive a certificate valid for three years, with annual surveillance audits in between.
Side-by-side comparison
| SOC 2 | ISO 27001 | |
|---|---|---|
| Recognition | Primarily US market | Global, especially EU/APAC |
| Output | Detailed audit report | Certificate + Statement of Applicability |
| Typical timeline | 2-3 months prep + 3-12 month observation window for Type 2 | 3-6 months to certification |
| Renewal | Annual report | 3-year cycle with annual surveillance |
| Typical cost (SME) | $15K-$40K all-in | $20K-$50K all-in |
Why the timeline question matters more than people think
A SOC 2 Type 2 report requires an observation period — usually 3 to 12 months — during which the auditor confirms your controls actually operated as designed. That means if a big enterprise deal is asking for SOC 2 today, you can't hand them a Type 2 report tomorrow no matter how much you spend. A SOC 2 Type 1 (point-in-time) report is faster to produce and often enough to unblock a deal while your Type 2 clock runs.
ISO 27001 doesn't have this same observation-period requirement in the same way — your ISMS needs to be operating, but the certification audit itself happens on a defined timeline rather than accumulating months of evidence first.
Overlap you can reuse
The good news: roughly 70-80% of the control work overlaps. Access control policies, incident response plans, vendor risk management, encryption standards, and employee security training satisfy both frameworks with minor adjustments. If you do SOC 2 first and later need ISO 27001, you're not starting from zero — you're mapping existing controls to a different framework and filling gaps.
Our recommendation framework
- US enterprise customers, VC-backed, Series A-C: SOC 2 Type 2 first.
- Selling into EU, UK, or APAC markets, or have data residency requirements: ISO 27001 first.
- Healthcare-adjacent SaaS: Consider HITRUST alongside either, since it's increasingly the bar for health-tech vendors specifically.
- Both markets simultaneously: Build your ISMS and control set to satisfy both from day one — it's more efficient than sequencing them a year apart.
What this looks like in practice
Most of the SaaS companies we work with start with a gap assessment before committing to either framework. That assessment maps your current controls against both sets of requirements, estimates the real cost and timeline for each, and ties the recommendation to your actual sales pipeline — not a generic industry rule of thumb.