The short answer depends on two things: whether you handle payment card data, and who your customers are. If you store, process or transmit card data, PCI DSS is a contractual obligation, not a choice. If you sell services to other businesses, SOC 2 is usually what US customers ask for, while ISO 27001 carries more weight internationally and in public sector tenders.
Many organizations end up with two or all three. The good news is that they overlap heavily. Below we compare them side by side, explain where they differ, and suggest a sensible order for pursuing them.
What are PCI DSS, SOC 2 and ISO 27001?
PCI DSS (Payment Card Industry Data Security Standard) is maintained by the PCI Security Standards Council. It sets security requirements for any organization that stores, processes or transmits cardholder data, or that can affect the security of that data. The payment brands enforce it, mostly through acquiring banks and contracts with service providers.
SOC 2 is an attestation report issued by an independent CPA firm under AICPA standards. It covers controls at a service organization relevant to the AICPA's Trust Services Criteria. There is no legal requirement to have one. Customers ask for it as part of vendor due diligence.
ISO/IEC 27001 is an international standard for an information security management system (ISMS). A certification body audits your ISMS and, if it conforms, issues a certificate. Customers, partners and procurement teams outside the US often expect it.
How do PCI DSS, SOC 2 and ISO 27001 compare?
| PCI DSS v4.0.1 | SOC 2 | ISO/IEC 27001:2022 | |
|---|---|---|---|
| Who requires it | Payment brands, via acquirers and contracts, for anyone handling card data | Customers, especially US businesses buying services | Customers, partners and procurement teams, especially outside the US |
| Scope | The cardholder data environment and connected systems | The system you describe, against the Trust Services Criteria categories you choose | The ISMS scope you define, which can be the whole organization or a part of it |
| Who assesses | Qualified Security Assessor, or you (via self-assessment) where your acquirer allows | Licensed CPA firm | Certification body, ideally accredited |
| What you get | Report on Compliance (ROC) or Self-Assessment Questionnaire (SAQ), each with an Attestation of Compliance (AOC) | Attestation report, Type I or Type II; optional SOC 3 for public use | Certificate, plus audit reports from the certification body |
| Cycle | Annual validation, plus ongoing activities such as quarterly external vulnerability scans by an Approved Scanning Vendor | Usually annual, with consecutive Type II periods | Three-year certificate with surveillance audits in years one and two and recertification in year three |
| Prescriptiveness | High: specific technical requirements and frequencies, with a customized approach available in some assessments | Low: principles-based criteria, and you design the controls | Medium: prescriptive management system requirements, with controls selected based on your risk assessment |
| Market fit | Global, wherever cards are accepted | Strongest in North America, particularly for SaaS and B2B services | International, widely recognized in Europe, Asia-Pacific and public sector procurement |
| Shareability | AOC is commonly shared with partners; ROC stays tightly held | Restricted use, usually shared under NDA | Certificate can be published |
What does PCI DSS require right now?
PCI DSS v4.0.1 is the only active version. The PCI SSC published v4.0.1 in June 2024 as a limited revision that clarified wording without adding or removing requirements, and v4.0 was retired on December 31, 2024. The requirements that v4.0 introduced as future-dated best practices became mandatory on March 31, 2025. Any assessment now covers all of them.
How you validate depends on what you are and how much you process. The payment brands define merchant and service provider levels, and your acquirer tells you which validation applies. Larger entities typically need a Report on Compliance from a Qualified Security Assessor. Smaller merchants usually complete the Self-Assessment Questionnaire that matches how they accept payments.
PCI DSS is the most prescriptive of the three. It specifies things like how often to scan for vulnerabilities, how long to keep audit logs and what sensitive authentication data must never be stored after authorization. The customized approach, introduced in v4.0, lets entities meet some objectives in other ways, but it requires a targeted risk analysis for each requirement met that way and more assessment work.
Scope is where most of the effort goes. Using a validated third-party payment provider, hosted payment pages or tokenization can shrink the cardholder data environment considerably. It rarely removes PCI DSS obligations altogether.
What does SOC 2 cover?
A SOC 2 examination evaluates controls against the AICPA's 2017 Trust Services Criteria, which had their points of focus revised in 2022. There are five categories:
- Security (the common criteria, CC1 through CC9), required in every SOC 2
- Availability, optional
- Processing Integrity, optional
- Confidentiality, optional
- Privacy, optional
Many first reports cover Security alone. Add another category only when it reflects a commitment you actually make to customers, such as uptime commitments for Availability.
A Type I report evaluates control design as of a single date. A Type II report also tests whether controls operated effectively over a period, commonly three to twelve months. Most enterprise buyers want a Type II.
SOC 2 isn't a certification. The auditor issues an opinion, and each customer decides whether the report meets their needs. Because the criteria are principles-based, the report describes your controls in detail, and reviewers read it closely.
What does ISO 27001 certification involve?
ISO/IEC 27001:2022 has two parts. Clauses 4 to 10 set requirements for the management system itself. These include understanding context and interested parties, leadership commitment, risk assessment and treatment, internal audit, management review and continual improvement. You can't exclude any of them.
Annex A lists 93 controls in four themes: organizational, people, physical and technological. You decide which apply based on your risk assessment. Your Statement of Applicability records each decision and the reason for it.
Certification starts with a Stage 1 audit, which reviews documentation and readiness, and a Stage 2 audit, which checks the ISMS in operation. After that, surveillance audits happen in each of the next two years, with a full recertification audit before the three-year certificate expires.
What is the ISO 27001:2022 transition deadline?
Certificates issued against the 2013 edition expire or will be withdrawn at the end of the transition period on October 31, 2025. That is about six weeks away. Under the IAF's transition rules, initial certification and recertification audits have been conducted against the 2022 edition since April 30, 2024 at the latest. If you still hold a 2013 certificate, confirm your transition audit is booked and will complete in time.
How do the three frameworks overlap?
A large share of the work is the same across all three. Each expects some version of:
- A documented risk assessment
- Security policies approved by management
- Access control, including MFA and timely removal of access
- Logging and monitoring
- Vulnerability management and patching
- Secure configuration and change management
- Vendor and third-party risk management
- Incident response planning and testing
- Security awareness training
- Backup and recovery
The differences sit at the edges. PCI DSS adds detailed technical requirements for the cardholder data environment. ISO 27001 adds the management system: internal audit, management review, documented objectives and continual improvement. SOC 2 adds a formal system description and, for Type II, proof of consistent operation across the whole period.
Building one common control set and mapping it to all three lets a single control, and a single piece of evidence, serve every audit. Design each control to the strictest requirement it maps to. That's usually PCI DSS on frequency and technical detail, and ISO 27001 on governance.
Which framework should you pursue first?
Work through these questions in order.
- Do you store, process or transmit card data, or could you affect its security? If yes, PCI DSS comes first because it's already a contractual obligation. Start by reducing scope, then validate the way your acquirer requires.
- Where are your customers, and what are they asking for? Look at recent security questionnaires, contract clauses and lost deals. Mostly US business customers asking for SOC 2 points to SOC 2. Customers in Europe or elsewhere, or public sector tenders naming ISO 27001, point to ISO 27001.
- Do you need a governance structure as much as a report? ISO 27001's management system makes you set objectives, run internal audits and review the program at leadership level. If your program lacks that structure, ISO 27001 builds it.
- What will the second framework cost in effort? With a mapped control set, adding SOC 2 after ISO 27001, or the reverse, is mostly a matter of filling gaps rather than starting over.
A common path for a US-based SaaS company that takes card payments is PCI DSS validation with a reduced scope, then SOC 2 Type II, then ISO 27001 once international sales grow. A company selling mainly into Europe might reverse the last two. Neither order is wrong. Let your customers' actual requests decide.
Frequently asked questions
Can SOC 2 or ISO 27001 replace PCI DSS?
No. The payment brands and acquirers require PCI DSS validation specifically. A SOC 2 report or ISO 27001 certificate won't substitute for it, although much of the underlying evidence can be reused.
Is ISO 27001 harder than SOC 2?
It's different rather than strictly harder. ISO 27001 demands management system disciplines, such as internal audit and management review, that SOC 2 doesn't require in the same form. A SOC 2 Type II demands evidence that controls operated consistently throughout a period, tested by sampling.
We use a payment processor. Do we still need PCI DSS?
Usually yes, but your scope and validation effort may be much smaller. Many merchants who fully outsource payment handling qualify for a shorter Self-Assessment Questionnaire. Confirm the right SAQ with your acquirer.
Do customers accept a SOC 3 instead of a SOC 2?
A SOC 3 is a short, general-use report that can be posted publicly. It helps early in a sales process, but security reviewers typically still ask for the full SOC 2.
Key takeaways
- Handle card data? PCI DSS v4.0.1 applies, including every requirement that took effect on March 31, 2025.
- Choose between SOC 2 and ISO 27001 based on where your customers are and what they ask for.
- Holding an ISO 27001:2013 certificate? Complete the transition before October 31, 2025.
- Build one mapped control set so evidence serves every framework you pursue.
- Reduce PCI DSS scope before you validate, and scope SOC 2 and ISO 27001 around the services customers actually buy.