For a growing SaaS or service company, the day comes when one prospect asks for SOC 2 and another asks for ISO 27001. The temptation is to treat them as two separate compliance projects - two consultants, two sets of documents, two timelines, double the cost. That is the wrong model. ISO 27001 and SOC 2 are different in form, but they are built on largely the same security controls. Run intelligently, the second framework costs a fraction of the first.
This guide shows how. For the foundational ISO work see our implementation roadmap; for the SaaS-specific angle most dual-compliance companies share, see ISO 27001 for SaaS.
1. Two Different Objects
Understanding what each framework actually is prevents most of the confusion:
- ISO 27001 is an international certification of an Information Security Management System, issued by an accredited certification body and valid for three years (with annual surveillance audits). It certifies that you have a managed, continually improving security system - not just controls, but the management system around them.
- SOC 2 is an attestation report produced by a licensed CPA firm against the AICPA's Trust Services Criteria. A Type 1 report describes how your controls are designed at a point in time; a Type 2 report attests to how they operated over a period (typically 3-12 months). It is a report a customer reads, not a certificate you display.
So ISO certifies a system; SOC 2 attests to controls. That distinction shapes everything downstream - but it does not change the fact that the underlying controls are mostly the same.
2. The Control Overlap
Estimates commonly place the control overlap between roughly 40% and 85%, depending on which Trust Services Criteria you include and how your ISO scope is drawn. The SOC 2 Security criterion in particular maps very closely onto ISO 27001 Annex A. Where they align:
| Shared Control Area | ISO 27001 Annex A | SOC 2 TSC |
|---|---|---|
| Access control | A.5.15-5.18, A.8.2-8.5 | CC6.x |
| Change management | A.8.32 | CC8.x |
| Logging & monitoring | A.8.15, A.8.16 | CC7.x |
| Incident response | A.5.24-5.28 | CC7.x |
| Risk assessment | Clause 6.1.2 | CC3.x |
| Vendor management | A.5.19-5.23 | CC9.x |
| Encryption | A.8.24 | CC6.x |
| Vulnerability management | A.8.8 | CC7.x |
The practical consequence: most of the heavy-lifting controls count toward both frameworks. The non-overlapping portion is largely the ISO management-system requirements (the ISMS clauses 4-10) and the SOC 2 report-specific narrative and any additional Trust Services Criteria you elect (Availability, Confidentiality, Processing Integrity, Privacy).
SOC 2 and ISO 27001, demystified
SecComply's founders cover security certifications and how the major frameworks relate to each other on their YouTube channel - a useful primer if you are weighing which to pursue.
3. Which Market Needs Which
The reason dual compliance is common comes down to a geographic split in buyer expectations:
- SOC 2 - North America. SOC 2 is the de-facto compliance expectation in the US market. US enterprise buyers and their vendor risk teams typically ask for a SOC 2 Type 2 report.
- ISO 27001 - international. ISO 27001 is the globally recognised standard and is more commonly expected by European and other international customers.
- Both - companies selling across regions. Most SaaS and service companies that scale internationally end up needing both, because their customer base spans the US and the rest of the world.
If your pipeline is blocked by US buyers asking for SOC 2 and European buyers asking for ISO, dual compliance is not gold-plating - it is unblocking revenue on two fronts.
5. The Combined Readiness Strategy
Run one control programme, instrumented to produce evidence for both:
- One control set. Implement controls to ISO Annex A standard, which generally meets or exceeds SOC 2's Security criterion.
- One evidence pipeline. Capture evidence continuously (for SOC 2 Type 2) in a way that also feeds ISO sampling.
- One risk assessment. The ISO risk assessment also supports SOC 2 CC3.
- Two front-ends. The ISO management system documentation (clauses 4-10) and the SOC 2 system description are the framework-specific layers built on the shared control base.
6. Sequencing the Two
The right order depends on which customers are blocking deals now:
- ISO first, then SOC 2. Build the full ISMS as the foundation, then map the Trust Services Criteria onto it. Because SOC 2 Type 2 covers an operating period, you can begin accumulating SOC 2 evidence while finishing ISO.
- SOC 2 first, then ISO. Companies selling primarily to US buyers sometimes start with SOC 2 Type 1 for speed (it is point-in-time), move to Type 2, and add ISO as international demand grows.
- Parallel. With the right partner and a clean control base, both can run largely together, with the certification audit and the SOC 2 examination scheduled close to each other.
Whichever order, the principle holds: build the controls once, present them to both auditors. Pair this with our ISO 27001 + DPDP guide if you also need Indian data protection compliance.
Pursuing ISO 27001 and SOC 2 together?
SecComply runs combined ISO 27001 + SOC 2 programmes - one control set, one evidence pipeline, two audits. Built so the second framework costs a fraction of the first.
Book a dual-compliance call →FAQ
ISO 27001 is an international certification of an Information Security Management System, issued by an accredited certification body, valid for three years. SOC 2 is an attestation report produced by a licensed CPA firm against the AICPA's Trust Services Criteria, describing how your controls operate. ISO 27001 certifies you have a managed, continually improving security system; SOC 2 attests to how specific controls are designed and (for Type 2) operated over a period. One is a certificate; the other is a report.
Estimates commonly put the control overlap between roughly 40% and 85%, depending on which SOC 2 Trust Services Criteria you include and how your ISO scope is drawn. The Security criterion of SOC 2 in particular maps very closely onto ISO 27001 Annex A controls. The practical consequence is that most of the work - access control, encryption, logging, change management, incident response, vendor management - counts toward both.
SOC 2 is the de-facto expectation in North America, so US enterprise buyers usually ask for it. ISO 27001 is the international standard and is more commonly expected by European and global customers. If you sell to both markets - as most growing SaaS and service companies eventually do - you are likely to need both. The combined approach exists precisely because the market split makes dual compliance common.
Largely yes for the overlapping controls. The access reviews, change tickets, logs, vulnerability scans, vendor assessments, and incident records you maintain serve both the ISO 27001 audit and the SOC 2 examination. The main difference is form: SOC 2 Type 2 requires evidence of operation across a defined period, so you maintain it continuously, while ISO sampling is point-in-time plus history. Build the evidence once, present it to both auditors.
A common and efficient approach is to build the ISO 27001 ISMS as the foundation, since it establishes the managed system and the full control set, then map the SOC 2 Trust Services Criteria onto it and run a SOC 2 examination. Because SOC 2 Type 2 covers an operating period, you can begin accumulating SOC 2 evidence while finishing ISO. Some companies that sell primarily to US buyers start with SOC 2 Type 1 for speed and add ISO later. The right order depends on which customers are blocking deals now.