Once a SaaS company starts selling to mid-market and enterprise buyers, a security questionnaire arrives, and the question becomes unavoidable: SOC 2, ISO 27001, or both? They overlap heavily — same underlying controls, same goal of proving you manage information security responsibly — but they are not interchangeable, and picking the wrong one first can cost you a deal or a wasted audit cycle. Here's how to choose based on who you sell to, not on which acronym sounds more impressive.
What each one actually is
SOC 2 is an attestation report produced by a US CPA firm against the AICPA's Trust Services Criteria. There's no 'pass/fail certificate' — buyers read the auditor's report. A Type I snapshots your controls at a point in time; a Type II tests that they operated over a period (usually 3–12 months), and Type II is what enterprise buyers want. ISO 27001 is an international standard: you build an Information Security Management System (ISMS), an accredited body audits it, and you receive a certificate valid for three years with annual surveillance audits. SOC 2 produces a detailed report; ISO 27001 produces a recognized certificate.
Who asks for which
- Selling primarily to US companies, especially tech and SaaS buyers: SOC 2 Type II is the default expectation and usually the faster route to unblocking deals.
- Selling into the UK, EU, the Middle East, or APAC, or to large enterprises and the public sector: ISO 27001 is the more universally recognized credential.
- Selling to regulated industries or global enterprises: you'll eventually be asked for both, because procurement teams in different regions trust different artifacts.
- Early and capital-constrained: lead with the one your current and next ten target buyers actually request — ask your sales team, not the internet.
Cost, time, and effort in 2026
A first SOC 2 Type II typically runs a 3–6 month observation window after readiness, with audit fees commonly in the $15–40K range plus tooling and internal time. ISO 27001 certification often runs 4–9 months end to end, with certification-body fees in a similar-to-higher band and a heavier documentation load up front because the ISMS is more prescriptive. The dominant cost in both is rarely the auditor — it's the engineering and operational time to implement and evidence the controls. Compliance automation platforms have compressed that materially, but they don't eliminate it.
The 80% overlap — and how to sequence
The encouraging reality: the two share most of their substance. Access control, encryption, change management, vulnerability management, vendor risk, logging, incident response, and HR security underpin both. If you implement controls cleanly for one, you've done roughly 70–80% of the work for the other. The efficient sequence for most growth-stage SaaS: implement the control set once with both frameworks in mind, certify first to whichever your buyers demand now, then add the second as a delta when a region or deal requires it — rather than running two disconnected programs.
The mistake that wastes a year
Treating compliance as a paperwork exercise owned by a consultant, divorced from engineering. The result is a binder of policies nobody follows, controls that exist on paper but not in production, and an audit that surfaces the gap at the worst possible moment. Compliance that lasts is built into how engineering already works — enforced SSO, peer-reviewed changes, automated evidence collection, infrastructure as code. Done that way, the certificate is a byproduct of good engineering, and re-certifying each year is routine instead of a fire drill.
How Infiniti Tech Partners runs compliance
We help you pick the right framework for the buyers you're actually chasing, implement the controls inside your engineering workflow (not as a parallel paper trail), wire up automated evidence collection, and get you audit-ready — then make the second certification a low-cost delta when you need it. It's the same engineering-led approach behind our SOC 2 work. If a security questionnaire is blocking a deal, start a conversation.
More reading
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SecuritySOC 2 in 90 Days: The Engineering-Led Playbook
How a senior engineering team can take a growth-stage SaaS company from zero SOC 2 controls to a Type I attestation in 90 days — without buying a compliance platform.