PCI DSS is a payment industry standard with fixed requirements for protecting cardholder data. SOC 2 is an independent auditor's report on whether your controls meet the Trust Services Criteria you chose. You need PCI DSS when you handle card data, and SOC 2 when customers want assurance about your service.
What is each one?
PCI DSS comes from the PCI Security Standards Council. It applies to entities that store, process or transmit cardholder data or could affect the cardholder data environment, from merchants to service providers. The requirements are set by the standard, and validation is done by a self assessment or a Qualified Security Assessor depending on your role and the card brands' rules.
SOC 2 is part of the AICPA's System and Organization Controls suite. A licensed CPA firm examines a service organisation's controls and issues a report. You define the system boundary and select criteria, and the report describes what the auditor tested. The AICPA publishes the professional standards for these engagements and has warned that promises of fast and easy reports threaten the credibility of the work.
How do they differ?
- Who writes the rules: PCI DSS is fixed by the Council. In SOC 2, the criteria are fixed but you choose which categories apply and describe your own controls.
- What is tested: PCI DSS looks at the cardholder data environment. SOC 2 looks at the system you define, which may include no card data.
- Who needs it: card acceptance partners require PCI DSS. Business customers often ask for SOC 2.
- Output: PCI DSS produces a validation such as a report on compliance or attestation. SOC 2 produces an auditor's opinion.
Where do they overlap?
Both expect access control, MFA for administrators, logging, vulnerability management, change control, incident response and vendor oversight. Evidence for one often serves the other. A constructed example: a quarterly access review export that satisfies the PCI access requirement can also support a SOC 2 access control test, as long as it covers the right systems and period.
Does one replace the other?
No. A SOC 2 report does not validate PCI DSS, and a PCI validation does not give a business customer an auditor's opinion on your service controls. Some buyers accept one in place of a questionnaire, but that is their decision. Ask the buyer which document they need, and why.
How should you sequence them?
If you take cards directly, PCI DSS is non-negotiable and comes with the commercial relationship, so start there and reduce scope with hosted payment fields. If you sell a B2B service and handle no cards, begin with SOC 2 when enterprise buyers ask. If you do both, build a single control library with each requirement mapped, so you collect evidence once.
What to do
- Ask the customer or acquirer which attestation they require and why.
- Define system boundaries separately for PCI and SOC 2.
- Build one control library and map PCI requirements and SOC 2 criteria to it.
- Automate evidence collection with dates and owners.
- Reduce PCI scope before you start the assessment.
- Check that your SOC 2 auditor is a licensed CPA firm.
Quick check
Can SOC 2 prove we are PCI compliant?
No. They are separate programs with different issuers and scopes. Card brands and acquirers decide how PCI DSS is validated.
Which is harder?
It depends on scope. PCI DSS is prescriptive and gets large if card data is spread widely. SOC 2 effort depends on the boundary and criteria you choose.
Sources
Last reviewed: 18 October 2026.
