SOC 2 vs ISO 27001 vs PCI DSS: The Compliance Roadmap for Companies That Need More Than One

Most companies do not get to choose just one compliance framework. A SaaS company selling to U.S. enterprises needs SOC 2. If they expand to Europe, ISO 27001 becomes a requirement. If they accept credit card payments directly, PCI DSS enters the picture. And suddenly you are managing three overlapping compliance programs with different audit cycles, different documentation requirements, and different costs.

The good news is that these frameworks share a significant amount of common ground. The bad news is that most companies discover the overlap too late, after they have already built three separate compliance silos with redundant controls, duplicate documentation, and wasted budget. This guide breaks down exactly how SOC 2, ISO 27001, and PCI DSS compare, when you need each one, where they overlap, and how to pursue multiple frameworks without tripling your compliance spend.

What Each Framework Actually Is (and Is Not)

Before comparing the three, it helps to understand what each framework does and why it exists. They are not interchangeable, and having one does not exempt you from needing another.

SOC 2

SOC 2 is an attestation report, not a certification. It is issued by a licensed CPA firm after they evaluate your security controls against the AICPA Trust Services Criteria: security, availability, processing integrity, confidentiality, and privacy. You choose which criteria to include based on your business. The auditor issues a report describing your controls and whether they operated effectively. A Type I report evaluates control design at a point in time; a Type II report evaluates operational effectiveness over a period (usually 6 to 12 months).

SOC 2 is the dominant compliance standard for B2B SaaS companies selling in the United States. It is what enterprise procurement teams ask for, what investors expect, and what closes deals. If you are a startup preparing for enterprise sales, SOC 2 is almost certainly on your roadmap.

ISO 27001

ISO 27001 is a formal international certification. It requires establishing an Information Security Management System (ISMS) -- a structured framework for managing information security risks across your organization. An accredited certification body audits your ISMS against the standard's requirements and the 93 controls in Annex A. You must address every Annex A control, either implementing it or formally justifying its exclusion in your Statement of Applicability.

ISO 27001 is the global standard. European, Asian, and Middle Eastern enterprises ask for it the way U.S. companies ask for SOC 2. It is recognized in over 160 countries and is increasingly required for government contracts, regulated industries, and companies expanding internationally. The certification process is more rigorous than SOC 2 but produces a globally recognized credential.

PCI DSS

PCI DSS is a mandatory standard, not a voluntary framework. If your company processes, stores, or transmits credit card data, you must comply with PCI DSS. This is not a suggestion or a competitive advantage -- it is a contractual requirement enforced by Visa, Mastercard, American Express, and other payment card brands through your acquiring bank. Non-compliance can result in fines of $5,000 to $100,000 per month and, in extreme cases, loss of the ability to accept card payments entirely.

PCI DSS v4.0 is now the current version, with all future-dated requirements mandatory as of March 2025. The standard is prescriptive and detailed, covering 12 requirement families with hundreds of specific controls. Compliance validation depends on your merchant level: Level 1 merchants require a full Report on Compliance (ROC) from a Qualified Security Assessor (QSA), while smaller merchants can self-assess using Self-Assessment Questionnaires (SAQs).

The Comprehensive Comparison

The following table breaks down the key differences across all three frameworks. Understanding these distinctions is critical for planning a multi-framework compliance program.

Where the Frameworks Overlap

This is the most important section of this guide. Roughly 60 to 70 percent of the security controls required by SOC 2, ISO 27001, and PCI DSS are functionally identical. If you design your security program around these shared controls from the start, you can pursue all three frameworks with significantly less effort than building each one independently.

The core controls that satisfy all three frameworks include:

• Access control: Multi-factor authentication, role-based access, least privilege, regular access reviews, and timely deprovisioning
• Encryption: Data encrypted at rest and in transit using industry-standard algorithms (PCI DSS has specific cipher requirements)
• Incident response: Documented plan, defined roles, tested procedures, post-incident review
• Vulnerability management: Regular scanning, patch management, risk-based prioritization of findings
• Penetration testing: Independent third-party assessments at least annually (PCI DSS has the most prescriptive requirements)
• Logging and monitoring: Centralized audit trails, alerting on security events, log retention policies
• Change management: Code review, testing before deployment, documented approval processes
• Vendor risk management: Third-party security assessments, contractual security requirements, ongoing monitoring
• Security awareness training: Regular employee training, phishing simulations, documented completion tracking
• Business continuity: Backup procedures, disaster recovery plans, tested restoration processes

Framework-specific requirements

While the overlap is substantial, each framework has unique requirements that the others do not share:

SOC 2 only: Trust Services Criteria mapping (you choose which criteria to include), system description narrative, management assertions, and complementary user entity controls (CUECs) that describe what your customers need to do on their end.

ISO 27001 only: A formal Information Security Management System (ISMS), risk assessment methodology with risk treatment plans, Statement of Applicability covering all 93 Annex A controls, management review meetings, and an internal audit program. The internal audit requirement alone adds a layer of governance that SOC 2 and PCI DSS do not mandate.

PCI DSS only: Network segmentation testing, cardholder data flow diagrams, quarterly ASV scans, specific logging requirements (Requirement 10), payment page integrity monitoring (v4.0), and the most prescriptive access control requirements of the three.

Which Framework First? Recommendations by Company Profile

The right starting framework depends on your business model, market, and whether you handle payment card data. Here are practical recommendations for the most common company profiles.

SaaS startup selling to U.S. enterprises

U.S. enterprise buyers ask for SOC 2. Start there. A Type I report gets you in the door within one quarter, and most buyers will accept it with a commitment to complete Type II within 12 months. Use a compliance automation platform from day one -- the same platform will support ISO 27001 later, so you are not paying twice for tooling. If your startup roadmap includes European expansion, plan for ISO 27001 to begin while your Type II audit period is running.

Fintech or payments company

If you handle payment card data, PCI DSS is not optional. It is a contractual requirement and you should not delay it. However, fintech companies also need SOC 2 to close enterprise deals, so start SOC 2 preparation in parallel with PCI DSS. The controls you implement for PCI DSS -- access control, encryption, logging, vulnerability management -- will satisfy a large portion of SOC 2 requirements. Your PCI penetration test can be scoped to also satisfy SOC 2 auditor expectations, saving you from paying for two separate engagements.

Healthcare SaaS

Healthcare companies have HIPAA requirements layered on top. SOC 2 with the privacy and confidentiality criteria included provides strong coverage for HIPAA security requirements. Many compliance automation platforms offer HIPAA crosswalks alongside SOC 2, so you can demonstrate HIPAA alignment without a separate audit. ISO 27001 becomes relevant when selling to NHS trusts, European health systems, or international healthcare organizations that may not recognize SOC 2.

E-commerce company

E-commerce companies that use a payment processor like Stripe or Braintree may qualify for SAQ-A, which has the smallest scope and lowest cost. However, v4.0 added requirements for payment page script monitoring even for SAQ-A merchants. If you are a marketplace or platform handling card data more directly, PCI DSS scope and cost increase significantly. SOC 2 or ISO 27001 become relevant when you start selling B2B or white-label solutions alongside your consumer business.

Cost and Timeline Breakdown

Real-world compliance costs include far more than audit fees. Here is a realistic breakdown of what each framework costs when you account for tooling, internal effort, and required security assessments.

How to Pursue Multiple Frameworks Efficiently

If you know you need more than one framework, the single most impactful decision you can make is to build a unified security program from the start. Here is how.

Step 1: Build a unified control framework

Instead of creating separate control sets for each framework, build one master set of security controls and map each control to every framework it satisfies. A single access control policy can map to SOC 2 CC6.1, ISO 27001 A.5.15-A.5.18, and PCI DSS Requirement 7 simultaneously. When you implement MFA, document it once and cross-reference it across all three frameworks.

Most compliance automation platforms support multi-framework mapping natively. A single piece of evidence -- a screenshot of your MFA configuration, for example -- can satisfy controls in all three frameworks at once.

Step 2: Scope strategically

SOC 2 lets you define your system boundary. ISO 27001 covers your entire ISMS. PCI DSS covers your cardholder data environment. By aligning these scopes where possible -- ensuring your SOC 2 system description includes PCI-relevant infrastructure, for example -- you reduce the number of environments you need to document and audit separately.

For PCI DSS specifically, network segmentation that reduces your CDE scope also reduces the overlap you need to manage. A smaller CDE means fewer systems that need to satisfy all three frameworks simultaneously.

Step 3: Consolidate penetration testing

All three frameworks expect or require penetration testing, but with different emphases. A well-scoped penetration test can satisfy all three if the report covers application-layer testing (SOC 2), infrastructure and vulnerability assessment (ISO 27001), and CDE-specific testing with segmentation validation (PCI DSS). At Lorikeet Security, we regularly scope engagements that produce a single report satisfying all three frameworks, saving our clients from paying for three separate assessments.

Step 4: Align audit timing

SOC 2 Type II covers a period (usually 12 months). ISO 27001 surveillance audits happen annually. PCI DSS assessments are annual. If possible, align your audit observation periods so that evidence collection overlaps. Running all three audits within the same quarter means you are collecting evidence once, not three times throughout the year.

Step 5: Use gap analyses before each new framework

Before pursuing a second or third framework, conduct a formal gap analysis against the new standard using your existing controls as the baseline. You will likely find that 60-80% of the new framework's requirements are already satisfied. A readiness assessment focuses your effort (and budget) on the gaps rather than rebuilding from scratch.

Common Mistakes in Multi-Framework Compliance

After working with dozens of companies pursuing multiple compliance frameworks, these are the mistakes we see most often:

• Building compliance silos: Separate teams or consultants managing each framework with no coordination. This results in duplicate policies, inconsistent controls, and triple the documentation maintenance.
• Ignoring PCI DSS because "Stripe handles it": Using a payment processor reduces your PCI scope but does not eliminate it. PCI DSS v4.0 added requirements for payment page script monitoring that apply even to SAQ-A merchants.
• Pursuing ISO 27001 without a real ISMS: Some companies try to bolt ISO 27001 documentation onto an existing SOC 2 program. ISO 27001 requires a functioning ISMS with risk assessment, management review, internal audit, and continuous improvement. You cannot fake it with documentation alone.
• Scheduling three separate pentests: A single comprehensive penetration test scoped to cover all three frameworks is cheaper, faster, and produces more consistent results than three narrow tests.
• Underestimating PCI DSS effort: PCI DSS has more prescriptive, specific requirements than SOC 2 or ISO 27001. Companies that assume their SOC 2 controls automatically satisfy PCI are surprised by the gap in areas like segmentation testing, secure development (Requirement 6), and quarterly vulnerability scanning.
• Delaying compliance until a deal demands it: Rushing a compliance framework in 4-6 weeks to close a deal always costs more and produces weaker results than planning a 6-12 month timeline.

The Controls Mapping: Where All Three Align

To illustrate the overlap concretely, here is how key security domains map across all three frameworks:

This mapping is simplified, but it illustrates the point: one well-implemented control can satisfy requirements across all three frameworks. When you implement MFA for all administrative access, you are simultaneously satisfying SOC 2 CC6.1, ISO 27001 A.8.5, and PCI DSS Requirement 8.4. One control, one implementation, three frameworks satisfied.

When You Need All Three (and How to Sequence Them)

Some companies genuinely need all three frameworks. A global SaaS platform that accepts credit card payments and sells to both U.S. and European enterprises will need SOC 2, ISO 27001, and PCI DSS. Here is the recommended sequencing:

Months 1-4: Implement foundational security controls (access control, encryption, logging, incident response, vulnerability management). Begin compliance tooling setup. Conduct initial readiness assessment for your first framework.

Months 3-6: Start PCI DSS compliance if you handle card data (this is mandatory and should not be delayed). Simultaneously begin SOC 2 Type I preparation. Commission a penetration test scoped to cover both PCI DSS and SOC 2 requirements.

Months 4-8: Complete SOC 2 Type I. Begin SOC 2 Type II observation period. Complete PCI DSS assessment (or begin the ROC process for Level 1).

Months 8-14: Begin ISO 27001 preparation. Conduct gap analysis against Annex A using your existing SOC 2 and PCI DSS controls as the baseline. Build out ISMS documentation, risk assessment methodology, and Statement of Applicability. The dual certification approach can streamline this significantly.

Months 14-20: Complete ISO 27001 Stage 1 and Stage 2 audits. Complete first SOC 2 Type II report. Renew PCI DSS assessment. At this point, all three frameworks are in place and you shift to maintenance mode.

How Lorikeet Security Helps

We work with companies at every stage of the multi-framework compliance journey. Here is where we fit in:

• Multi-framework penetration testing: A single engagement scoped to satisfy SOC 2, ISO 27001, and PCI DSS auditor requirements. One test, one report structured with sections mapped to each framework, one cost.
• PCI DSS segmentation testing: Dedicated segmentation validation to verify your CDE is properly isolated, reducing PCI scope and audit cost.
• Readiness assessments: Gap analysis against any framework using your existing controls as the baseline, so you know exactly what needs to be done before engaging an auditor.
• Compliance-ready reporting: Our penetration test reports include executive summaries, technical findings with remediation guidance, and framework-specific appendices that auditors can reference directly.
• Ongoing security testing: Annual penetration testing aligned with your audit cycles, so you are never scrambling for a test before an assessment deadline.

Whether you are pursuing your first framework or adding a second or third, the right penetration testing partner makes the audit process significantly smoother. We have helped companies close SOC 2 audits with zero pentest-related findings, satisfy ISO 27001 Annex A.8.8 requirements, and pass PCI DSS Requirement 11.4 assessments. Check our pricing page for transparent penetration testing costs.

Lorikeet Security Team

Penetration Testing & Cybersecurity Consulting

We've completed 170+ security engagements across web apps, APIs, cloud infrastructure, and AI-generated codebases. Everything we publish here comes from patterns we see in real client work.