IT Security
SOC 2 vs ISO 27001: Differences, Overlap and Which One You Need
When an enterprise customer sends a security questionnaire, the first question is often whether you have SOC 2 or ISO 27001. They sound similar but are different things. This guide explains what each one is, who issues it, how they differ and overlap, and how to decide which one your SaaS, IT or BPO company needs first.
The short answer
ISO 27001 is a certification of your information security management system, issued by an accredited certification body against an international standard, and recognised worldwide. SOC 2 is an attestation report, written by an independent licensed CPA firm, on whether your controls meet the AICPA Trust Services Criteria, and it is mostly requested by US customers. They overlap heavily, so work done for one carries over to the other. Start with the one your customers actually ask for: SOC 2 for US enterprise buyers, ISO 27001 for buyers in India, Europe, Asia and tenders. Many global SaaS and IT companies eventually hold both.
What Are SOC 2 and ISO 27001?
ISO 27001
ISO/IEC 27001 is the international standard for information security management systems (ISMS). You define a scope, assess information security risks, choose controls from Annex A (93 controls in four themes in the 2022 edition), record your choices in a Statement of Applicability, run the system and have it audited. An accredited certification body issues the certificate after a two-stage audit, and the certificate runs on a three-year cycle with yearly surveillance audits.
SOC 2
SOC 2 is a reporting framework from the American Institute of CPAs (AICPA). An independent licensed CPA firm examines your controls against the Trust Services Criteria: Security is always included, and Availability, Processing Integrity, Confidentiality and Privacy are optional. The result is a detailed report with the auditor's opinion, not a certificate. We help with SOC 2 readiness as part of our IT security and certification services; see also our SOC 2 page.
SOC 2 vs ISO 27001: Side by Side
| SOC 2 | ISO 27001 | |
|---|---|---|
| What it is | Attestation report on controls | Certification of an information security management system |
| Based on | AICPA Trust Services Criteria | ISO/IEC 27001:2022 and Annex A controls |
| Issued by | Independent licensed CPA firm | Independent accredited certification body |
| What you receive | Detailed report with auditor's opinion, system description and test results | Certificate with scope, plus audit reports kept by the body |
| Flexibility | You design controls to meet the criteria you select | Risk-based, with a Statement of Applicability for 93 Annex A controls |
| Type or period | Type 1 (point in time) or Type 2 (over a period) | Three-year cycle with yearly surveillance audits |
| Who asks for it | Mostly US enterprise customers | Customers, tenders and regulators worldwide |
| How it is shared | Report usually shared under NDA | Certificate can be shared publicly |
| Renewal | Fresh report usually expected each year | Surveillance yearly, recertification at three years |
SOC 2 Type 1 vs Type 2
Most customers who ask for SOC 2 are really asking for a Type 2 report.
| Type 1 | Type 2 | |
|---|---|---|
| Tests | Whether controls are suitably designed | Whether controls operated effectively over time |
| Timing | At a single date | Over an observation period |
| Customer view | Shows a start | Usually preferred, with stronger evidence |
| When to use | First step, or quick answer to a buyer | Main goal for most B2B customers |
Not sure which one your customers need?
Book a free consultation. Tell us who you sell to and we will explain which report or certificate to build first and what it will take.
How Much Do They Overlap?
A lot. Both are built around risk, access control, change management, incident response, vendor management and business continuity. If you build one well, much of the evidence, policies and technical controls carry over to the other.
| Area | Shared | Extra in ISO 27001 | Extra in SOC 2 |
|---|---|---|---|
| Risk assessment | Identify and treat information security risks | Formal method, risk treatment plan, Statement of Applicability | Risk assessment tied to the criteria |
| Access control | User access, least privilege, reviews | Annex A access controls | Evidence of access reviews over the period |
| Change management | Controlled changes to systems | Operational planning and control | Tested samples of changes |
| Incident response | Detect, report and handle incidents | Incident management controls | Evidence of incident handling |
| Vendor management | Assess and monitor suppliers | Supplier controls | Complementary user entity controls and subservice organisations |
| Governance | Policies, roles and awareness | ISMS scope, internal audit, management review | System description |
| Business continuity | Backup and recovery | Continuity controls | Availability criteria, if selected |
This overlap is why companies that need both usually do one first and then extend. A mapped control set lets you collect evidence once and use it for both audits.
Which One Should You Get First?
| Your situation | Usually start with |
|---|---|
| SaaS company selling to US enterprises | SOC 2, often Type 1 then Type 2 |
| IT or BPO company with clients in India, Europe or Asia | ISO 27001 |
| Bidding for government or large tenders | ISO 27001 |
| Global buyers and both are being asked | Build ISO 27001, then add SOC 2, or the reverse based on urgency |
| Early-stage startup with first enterprise deal | The one named in that deal's security questionnaire |
| You also run IT services for customers | ISO 27001, and consider ISO 20000-1 for service management |
The most reliable method is to ask your top five prospects or customers which one they require, and what they accept. Check their security questionnaires and contracts for the exact wording.
Time and Cost
We do not publish prices here, because cost depends on your scope, headcount, systems, locations and current maturity. For ISO 27001 there are two parts: the consultant's fee and the certification body's audit fees. For SOC 2 you pay for readiness work, the CPA firm's audit fee and often security tooling. ISO 27001 needs the system to run long enough to produce records before the audit, and SOC 2 Type 2 needs an observation period before the auditor can report. Get written quotes that show what is included and for how many years.
Common Myths
| Myth | Reality |
|---|---|
| “SOC 2 certification” is a certificate | SOC 2 is an attestation report from a CPA firm |
| ISO 27001 makes you unhackable | It manages risk, it does not guarantee that no breach will occur |
| SOC 2 and ISO 27001 are the same | They differ in issuer, format, audience and structure, though they overlap heavily |
| One replaces the other everywhere | Some customers accept either, others name one specifically |
| A consultant can issue the report or certificate | Only the independent CPA firm or certification body can |
Neither guarantees you will never be breached, and neither replaces your legal duties. Both show that you manage security in a structured, independently checked way, but you remain responsible for compliance with data protection law, such as the Digital Personal Data Protection Act, 2023, and with your customer contracts.
ISO 27001:2022
ISO/IEC 27001:2022 is the current edition, with a 2024 amendment that adds climate change considerations. The transition period from the 2013 edition has ended, so new and renewed certificates are issued against the 2022 edition. If your documents still refer to the 2013 Annex A, update them before your audit.
Support for Chennai and Indian IT Companies
Impleton helps SaaS, IT, BPO, fintech and healthcare companies across Chennai and India with ISO 27001 and SOC 2 readiness. We offer a free consultation, gap assessment, risk assessment, policies and documentation, staff training, internal audit and audit support, with a fixed-fee quote for our consulting. We do not issue certificates or SOC 2 reports. Those come from an independent accredited certification body or a licensed CPA firm. We support businesses in and around:
See our ISO 27001 certification in Chennai page, or talk to our team.
Frequently Asked Questions: SOC 2 vs ISO 27001
ISO 27001 is a certification of your information security management system, issued by an accredited certification body against an international standard. SOC 2 is an attestation report, written by an independent licensed CPA firm, on whether your controls meet the AICPA Trust Services Criteria. ISO 27001 is a global, standardised certificate. SOC 2 is a detailed report mostly requested by US customers.
Strictly, no. SOC 2 is an attestation report with an auditor's opinion, not a certificate. People often say SOC 2 certified, but what you receive is a SOC 2 report from a CPA firm. ISO 27001, by contrast, is a certification.
Neither is better for everyone. The right one depends on who your customers are. US enterprise customers often ask for SOC 2, while customers in Europe, India, Asia, government bodies and tenders more often ask for ISO 27001. Many SaaS and IT companies with global customers eventually hold both.
Not always. Start with the one your customers actually ask for. If you sell to both US and international or Indian customers, holding both is common, and the work overlaps heavily, so the second one is much easier than the first.
If your main buyers are US enterprises, SOC 2 is often the first request. If your buyers are in India, Europe, the Middle East or Asia, or you bid for tenders, ISO 27001 is usually asked for first. Ask your top five prospects which they require before you decide.
Sometimes, but not always. Some US customers accept ISO 27001, while others require a SOC 2 report specifically in their security review. Check each customer's questionnaire or contract.
A Type 1 report assesses whether your controls are suitably designed at a single point in time. A Type 2 report also tests whether the controls operated effectively over a period, commonly several months. Customers usually value Type 2 more, because it shows evidence over time.
It depends on your size, scope and current security controls. ISO 27001 needs the system to run long enough to produce records before the audit. SOC 2 Type 2 needs an observation period before the auditor can report. We give you a realistic timeline for either after a free consultation.
Cost depends on your scope, headcount, systems, locations and current maturity. For ISO 27001 there are two parts, the consultant's fee and the certification body's audit fees. For SOC 2 there are the readiness work, the CPA firm's audit fee and often security tooling. Ask for written quotes that show what is included.
ISO 27001 certificates are issued by independent certification bodies accredited for the standard. SOC 2 reports are issued by independent licensed CPA firms. A consultant, including Impleton, prepares you but cannot issue either.
An ISO 27001 certificate commonly runs on a three-year cycle with yearly surveillance audits. A SOC 2 report covers a specific period or date, and customers usually expect a fresh report every year.
A lot. Both rely on risk assessment, access control, change management, incident response, vendor management, monitoring, business continuity and security awareness. If you build one well, most of the work carries over to the other. Each also has its own extras, such as the Statement of Applicability in ISO 27001 and the system description in SOC 2.
No. Both help you show structured security controls, but neither replaces your obligations under data protection law, such as the Digital Personal Data Protection Act, 2023, or your contracts. They support compliance, they do not guarantee it.
Yes. We help with ISO 27001 from risk assessment to audit support, and with SOC 2 readiness, including control design, evidence and coordination with the independent CPA firm. We do not issue certificates or SOC 2 reports.
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