ISO 27001 vs SOC 2: Key Differences and Which One You Need

A security questionnaire comes back with one line: attach your SOC 2 report or your ISO 27001 certificate. Many teams treat the two as the same thing. Then a European buyer asks for the ISO certificate by name, or a US security team asks why there is no SOC 2 report on file. That is when the ISO 27001 vs SOC 2 question becomes real.

Both show that you protect customer data. But they are built by different bodies, for different buyers, using different audit models. This guide compares them side by side, shows where the controls overlap, and explains how to run both without doing the work twice.

Quick answer: ISO 27001 is an international certification of your whole information security management system (ISMS), issued by an accredited certification body and valid for three years. SOC 2 is an attestation report on the controls of one system or service, issued by a licensed CPA firm under AICPA standards. US enterprise buyers usually ask for SOC 2. Buyers in Europe, the UK, the Middle East and Asia, and public tenders, usually ask for ISO 27001. Many SaaS companies end up with both.

ISO 27001 vs SOC 2 at a Glance

The fastest way to see the gap is to compare who issues each one and what you receive.

What Is ISO 27001?

ISO/IEC 27001 is the international standard for an information security management system. It asks you to understand your context, assess risk, choose controls, and keep improving through internal audits and management review. The 2022 edition groups 93 Annex A controls into four themes: organizational, people, physical and technological.

An accredited certification body audits you in two stages and decides whether to certify. The IAF transition to the 2022 edition ended on 31 October 2025, so only ISO/IEC 27001:2022 certificates are valid now. Our guide on how to get ISO 27001 certified walks through each step.

What Is SOC 2?

SOC 2 is a report on the controls at a service organization. A licensed CPA firm examines them against the AICPA Trust Services Criteria. Security is always in scope. Availability, processing integrity, confidentiality and privacy are added when your customers need them.

A Type 1 report covers control design on one date. A Type 2 report also tests whether controls worked over a period, usually 3 to 12 months. There is no pass mark and no certificate, so "SOC 2 certified" is shorthand. Our SOC 2 compliance services guide covers Type 1 and Type 2 in more depth.

ISO 27001 vs SOC 2: The Four Differences That Matter

How Much Do ISO 27001 and SOC 2 Overlap?

The overlap is large, because both test the same security basics. The AICPA publishes a mapping of the Trust Services Criteria to ISO 27001. It was written before the 2022 edition, so map against the new Annex A numbers yourself.

The gaps sit at the edges. ISO 27001 adds management system work that SOC 2 does not test in the same way: context, objectives, a Statement of Applicability, internal audit and management review. SOC 2 adds a written system description and, for Type 2, proof that each control ran across the whole period.

SOC 2 vs ISO 27001: Which One Do You Need?

Start with who is asking, not which framework is better. The buyer's contract or questionnaire usually decides it.

For healthcare buyers, see our HITRUST certification page. AI teams can add ISO 42001 certification on top of an ISMS, and ISO 27701 adds privacy. Indian companies can read about ISO certification in India.

Do You Need Both ISO 27001 and SOC 2?

Not at first. Most companies start with the one their next big customer asks for. The second usually follows when they enter a new market, because each one answers a different buyer's checklist.

Holding one does not replace the other. A US buyer who asks for SOC 2 rarely accepts an ISO certificate instead. A European buyer may not accept a SOC 2 report in place of an ISO 27001 certificate. If both markets matter in the next 12 to 24 months, plan both now and map controls once.

ISO 27001 vs SOC 2 Cost and Timeline

Timelines depend on how ready your controls are. These ranges assume your controls already run day to day.

Building an ISMS or a SOC 2 control set from scratch takes longer, often several months. For ISO 27001, audit days come from the certification body's accreditation rules, so ask how yours were calculated. Our ISO 27001 certification page explains the audit and the fixed-fee quote we send after a free scoping review.

How to Run ISO 27001 and SOC 2 Without Doing the Work Twice

1. 01
   Map controls firstMap Annex A to the Trust Services Criteria before either audit, so one evidence set serves both.
2. 02
   Use one risk assessmentKeep a single risk register that meets ISO 27001 clause 6.1.2 and the SOC 2 risk criteria.
3. 03
   Keep one evidence storeStore access reviews, vendor checks and change logs once, in a form both auditors can sample.
4. 04
   Align the scopeDraw the ISMS scope and the SOC 2 system boundary around the same environment.
5. 05
   Plan one audit calendarSet the SOC 2 period and the ISO 27001 audit dates so they do not hit the same team in the same month.
6. 06
   Name one ownerPick one person who can answer both auditors without re-explaining the environment.
7. 07
   Keep the roles clearYour team or an independent adviser builds the controls. The certification body and the CPA firm only audit them.

For the SOC 2 side, our SOC 2 checklist lists the evidence a CPA firm usually samples. Software teams can also read ISO 27001 for SaaS.

Can One Audit Cover Both ISO 27001 and SOC 2?

Not fully. Some CPA firms issue a "SOC 2+" report that adds extra criteria, such as ISO 27001 controls, to a SOC 2 examination. That report is still a SOC 2 report. It is not an ISO 27001 certificate, and it will not appear in an accredited certificate register.

Only an accredited certification body can issue an ISO 27001 certificate. What you can do is run both audits on one calendar, against one evidence set. Read ISO 27001 accreditation vs certification to see how to check that a certificate is accredited.

Common Mistakes When Running Both

The most common mistake is sequencing. Two unrelated programs, two timelines and two evidence requests land on the same engineers in the same month. The controls overlap on paper but get written up twice because nobody mapped them first.

The second is treating the ISO 27001 risk assessment as a one-off document. SOC 2 examiners expect to see risk reviewed on a schedule, and so do ISO auditors at surveillance. Both ask the same question: who owns this control, and when was it last reviewed?

ISO 27001 and SOC 2 with Accredify Global

See our SOC 2 compliance audit services and SaaS compliance pages for how each engagement runs. To understand impartiality rules, read what an ISO certification body is.

ISO 27001 vs SOC 2 FAQ

What is the main difference between ISO 27001 and SOC 2?
ISO 27001 is a certification of your information security management system, issued by an accredited certification body. SOC 2 is an attestation report on the controls of one system, issued by a licensed CPA firm under AICPA standards.

Is ISO 27001 or SOC 2 better?
Neither is better in general. SOC 2 is usually asked for by US enterprise buyers. ISO 27001 is asked for by international buyers and public tenders. Pick the one your next customer requires.

Is SOC 2 a certification?
No. SOC 2 is an attestation report with a CPA firm's opinion. There is no certificate, so 'SOC 2 certified' is informal shorthand for holding a current SOC 2 report.

Does ISO 27001 replace SOC 2?
Usually not. A US buyer who asks for a SOC 2 report rarely accepts an ISO 27001 certificate instead, and the reverse is also true for many international buyers.

How much do ISO 27001 and SOC 2 overlap?
A lot. Risk assessment, access control, physical security, incident response, change management and supplier controls appear in both. The AICPA publishes a mapping, but it predates ISO 27001:2022, so map against the 2022 Annex A yourself.

Should a startup get ISO 27001 or SOC 2 first?
Start with the one your largest deal requires. US SaaS startups often start with SOC 2 Type 1 or Type 2. Startups selling into Europe, Asia or government often start with ISO 27001.

How long does ISO 27001 take compared with SOC 2?
Once your ISMS is ready, ISO 27001 Stage 1 and Stage 2 audits usually take 2 to 8 weeks. A SOC 2 Type 1 takes about 4 to 8 weeks, while a Type 2 needs an observation period of 3 to 12 months first.

Can one audit cover both ISO 27001 and SOC 2?
Not fully. A SOC 2+ report can add ISO 27001 controls, but it is still a SOC 2 report, not an ISO certificate. Only an accredited certification body can issue an ISO 27001 certificate. You can run both on one calendar with one evidence set.

How long is each one valid?
An ISO 27001 certificate is valid for three years, with surveillance audits each year. A SOC 2 report covers a date or period, and buyers usually expect a new report every year.

Which ISO 27001 edition applies in 2026?
ISO/IEC 27001:2022. The IAF transition from the 2013 edition ended on 31 October 2025, so certificates citing the 2013 edition are no longer valid.

Does Accredify Global offer both ISO 27001 and SOC 2?
Yes. Accredify Global audits and certifies ISO 27001 under UAF accreditation, with senior-led audits and a fixed-fee quote after scoping. SOC 2 examinations are performed and signed by a licensed CPA partner firm.