SOC 2 Compliance: What It Is and Whether You Need It

TL;DR

SOC 2 is a US audit framework from the AICPA that examines the security, availability, processing integrity, confidentiality, and privacy of service organizations.
SOC 2 Type I examines the design of controls at a point in time. SOC 2 Type II examines the operational effectiveness of controls over a period of at least 6 months. Type II is significantly more meaningful.
SOC 2 is primarily relevant for SaaS providers, cloud service providers, and IT outsourcing companies that have US customers or investors.
In the European market, ISO 27001 is the established standard. SOC 2 complements but does not replace ISO 27001 certification. Many international companies have both.
The cost of a SOC 2 audit ranges between EUR 30,000 and 100,000, depending on scope, complexity, and the Trust Service Criteria selected.

What is SOC 2?

SOC stands for System and Organization Controls and is an audit framework developed by the American Institute of Certified Public Accountants (AICPA). There are various SOC reports (SOC 1, SOC 2, SOC 3), and SOC 2 is the one relevant to information security and privacy.

A SOC 2 report attests that a service organization (typically a SaaS provider, cloud provider, or IT service company) has implemented appropriate controls to protect its customers' data. The report is prepared by an independent auditor (CPA) and can be requested by the service organization's customers.

Why is SOC 2 relevant for European companies? Because the US market has established SOC 2 as the de facto standard for evaluating service providers. If you sell software or IT services to US companies, you will sooner or later be asked for a SOC 2 report. US investors and venture capital firms also frequently expect SOC 2 compliance from their portfolio companies.

The Trust Service Criteria

SOC 2 is based on the Trust Service Criteria (TSC), which define five categories of controls. Each organization selects which criteria to include in their SOC 2 audit. Only "Security" is mandatory; the other four are optional.

Security (Common Criteria) — mandatory

The Security criteria form the core of every SOC 2 audit. They examine whether the service organization's information and systems are protected against unauthorized access, unauthorized disclosure, and damage.

The Common Criteria are divided into nine groups:

CC1: Control Environment. The foundations of the security organization: integrity and ethical values, management responsibilities, organizational structure, competency management, and accountability.

CC2: Communication and Information. How the organization generates, uses, and communicates security-relevant information: internal and external communication, reporting, and information quality.

CC3: Risk Assessment. How the organization identifies, assesses, and responds to risks: objective definition, risk identification and assessment, consideration of fraud and changes.

CC4: Monitoring Activities. How the organization monitors the effectiveness of its controls: ongoing monitoring, separate evaluations, and communication of control deficiencies.

CC5: Control Activities. The concrete security measures: policies and procedures, technology controls, and their implementation.

CC6: Logical and Physical Access Controls. Access control in all its facets: identity and access management, physical access controls, system boundaries, and authorized software.

CC7: System Operations. Operational management: detection and monitoring of security events, incident response, and recovery.

CC8: Change Management. How changes to infrastructure, data, and software are controlled.

CC9: Risk Mitigation. How the organization manages risks from business partners and third parties: supplier assessment and risk mitigation.

Availability (optional)

The Availability criteria examine whether the service organization's systems are available as agreed. This includes: performance monitoring, business continuity, disaster recovery, and capacity planning.

If your customers expect SLAs with availability guarantees, you should include Availability. For SaaS providers, this is almost always the case.

Processing Integrity (optional)

The Processing Integrity criteria examine whether data processing is complete, accurate, timely, and authorized. This is particularly relevant for organizations that process financial transactions, perform calculations, or transform data.

Confidentiality (optional)

The Confidentiality criteria examine whether confidential information is adequately protected: identification of confidential information, protection during processing, storage, and transmission, and secure disposal.

Privacy (optional)

The Privacy criteria examine whether personal data is processed in accordance with the privacy notice and defined principles: consent, purpose limitation, data minimization, quality, monitoring and disclosure, security, access, and deletion.

For European organizations, including the Privacy criteria can make sense to facilitate demonstrating DSGVO (GDPR) compliance to US customers.

Type I vs. Type II: The crucial difference

SOC 2 comes in two variants, and the difference is fundamental.

SOC 2 Type I

A Type I report examines the design of controls at a point in time. The auditor assesses whether the controls are designed such that they could meet the Trust Service Criteria. He does not examine whether the controls have actually functioned over a period of time.

Analogy: a Type I report is like a driving test where the examiner only checks whether you can properly adjust the car (mirrors, seat, seatbelt) but not whether you can actually drive.

Type I is faster and less expensive than Type II and is often used as an entry point to provide initial proof to customers. However, experienced customers only accept Type I as a transitional measure and expect a Type II report in short order.

SOC 2 Type II

A Type II report examines the operational effectiveness of controls over a period of at least six months (typically twelve months). The auditor examines not just whether the controls exist, but whether they have functioned consistently throughout the entire examination period.

Analogy: a Type II report is like a driving test where the examiner rides in the passenger seat for six months and evaluates your actual driving behavior.

Type II is the more meaningful variant and is expected by most customers and investors. It requires that the controls have been actively operated and documented throughout the entire observation period. Gaps in evidence (for example, a quarter without documented access reviews) are noted as control deficiencies in the report.

Recommendation

If you're pursuing SOC 2, plan for Type II from the start. You can begin with Type I to have initial proof sooner, but the real value lies in the Type II report. Plan the period so that you collect at least six, preferably twelve months of operational evidence before the auditor arrives.

The SOC 2 audit process

Phase 1: Readiness assessment (2 to 4 months)

Before commissioning an audit, you conduct a readiness assessment. You define the scope (which systems and processes will be examined), select the Trust Service Criteria, identify the required controls, and check whether they are implemented and functioning.

Typically, the readiness assessment produces a list of gaps that must be closed before the actual audit: missing controls, insufficient documentation, inconsistent processes.

Phase 2: Implement controls and collect evidence (3 to 6 months)

You implement the missing controls and ensure that all controls are consistently operated. At the same time, you begin systematically collecting evidence. Every control must be supported by evidence: logs, approvals, review records, screenshots, reports.

Evidence collection is the most resource-intensive part of SOC 2 preparation. For each control, you must demonstrate that it has functioned throughout the entire examination period. This means: regular access reviews must be documented, changes to infrastructure must have gone through a documented change management process, security incidents must have been logged and addressed.

Phase 3: The audit (4 to 8 weeks)

The auditor (a licensed CPA or CPA firm) examines the controls and evidence. For Type I, this is a point-in-time audit. For Type II, the auditor examines evidence across the entire observation period.

The auditor requests evidence (evidence requests), conducts interviews with key personnel, and examines systems and processes. Typical evidence requests include: policies and procedures, access lists and permission changes, change management tickets, vulnerability scan results, incident response logs, backup logs and restore tests, training records, and organizational charts.

Phase 4: The report

After completing the audit, the auditor prepares the SOC 2 report. The report contains: a description of the system and the controls examined, the result of the examination (auditor's opinion), details of the controls tested and their results, and any exceptions or control deficiencies identified.

The report is confidential and not made publicly available. You share it with customers on request, typically under NDA.

SOC 2 vs. ISO 27001: Commonalities and differences

The question "SOC 2 or ISO 27001?" comes up in every compliance conversation. The honest answer: it depends on who you're trying to convince.

Origin and recognition

ISO 27001 is an international standard from the International Organization for Standardization. It is recognized worldwide and is the de facto standard for information security management in Europe.

SOC 2 is a US framework from the AICPA. It is primarily expected in the North American market and is the de facto standard there for evaluating service organizations.

Approach

ISO 27001 certifies a management system. The question is: "Does the organization have a functioning ISMS?" The certification confirms the systematic approach, not the effectiveness of individual controls.

SOC 2 examines the effectiveness of specific controls. The question is: "Do the controls work as described?" The report goes into the details of each individual control.

Outcome

ISO 27001 results in a certificate valid for three years (with annual surveillance audits). The certificate is binary: certified or not.

SOC 2 results in a detailed report that lists the results for each control individually. There is no "pass" or "fail," but rather a differentiated presentation. The auditor can note exceptions and deficiencies without the overall opinion necessarily being negative.

Scope and detail

ISO 27001 is more flexible in scope. You define which parts of your organization the ISMS covers, and the controls emerge from your risk assessment.

SOC 2 is more focused on the specific service you provide to your customers. The controls are measured against the Trust Service Criteria, and the auditor examines them in detail.

Costs

ISO 27001: Build-up costs EUR 40,000 to 120,000, certification costs EUR 8,000 to 20,000, annual surveillance audits EUR 4,000 to 10,000.

SOC 2: Preparation costs EUR 20,000 to 60,000, audit costs EUR 30,000 to 100,000 per year (the report must be renewed annually).

When do you need what?

ISO 27001 only, if your customers are exclusively in the European market and there is no US connection.

SOC 2 only, if you serve exclusively the US market and European customers are not a factor (rare for European companies).

Both, if you operate internationally and have both European and US customers. The good news: the overlap is significant (estimated 70 to 80 percent of controls), and you can build an integrated compliance program that efficiently covers both requirements. A tool like ISMS Lite (ab 500 Euro pro Jahr oder als Einmalkauf für 2.500 Euro) maps the common control base so you create evidence once and use it for both frameworks, instead of licensing a separate enterprise platform for each.

Approaching SOC 2 pragmatically

Defining the scope

The scope of a SOC 2 audit is typically narrower than that of an ISO 27001 ISMS. It focuses on the service you provide to your customers: the SaaS platform, the cloud infrastructure, the IT support service. Everything that supports this service (development, operations, support, infrastructure) belongs in scope. Everything that has no connection to the service can be excluded.

Choosing the right Trust Service Criteria

For most SaaS providers and IT service companies, Security and Availability are the relevant criteria. Confidentiality comes into play if you explicitly process confidential customer data. Processing Integrity if you process transactions or perform calculations. Privacy if you process personal data and want to integrate the privacy evidence into the report.

Less is often more: each additional criterion increases the audit effort. Only choose the criteria your customers actually expect.

Leveraging automation

Evidence collection is the biggest cost driver in SOC 2. There are now platforms that automate the process: they pull evidence automatically from your systems (cloud provider configurations, access changes, deployment logs), remind you of due controls, and provide the auditor with a structured evidence pack. The investment in such a platform pays off from the second SOC 2 cycle onward.

Choosing the right auditor

SOC 2 audits may only be conducted by licensed CPAs (Certified Public Accountants) or CPA firms. The choice of auditor significantly influences the effort and outcome. An experienced auditor knows your industry, asks the right questions, and gives you valuable guidance during the readiness assessment. An inexperienced auditor can unnecessarily prolong the process.

Ask potential auditors about their experience in your industry, the number of SOC 2 audits they conduct annually, and references from comparable organizations.

Common mistakes in SOC 2 preparation

Starting too late

SOC 2 Type II requires at least six months of operational evidence. If your customer expects the report in three months, Type II is no longer achievable in time. Plan at least twelve months from project start to a completed Type II report.

Not collecting evidence systematically

The most common cause of control deficiencies in the report: a control exists and works, but there's no evidence. If you perform quarterly access reviews but don't document the results, the auditor cannot confirm effectiveness.

Defining the scope too broadly

Every system in scope must be examined. Every control in scope must be evidenced. A scope that's too broad drives up costs and increases the risk of control deficiencies.

Treating ISO 27001 and SOC 2 in isolation

If you need both, build an integrated compliance program. The controls overlap significantly. Use a shared control library that serves both frameworks instead of building parallel systems.

SOC 2 in the context of European regulation

SOC 2 does not replace any European regulation. It is not evidence of NIS2 compliance, not a GDPR certification, and not a substitute for ISO 27001 in industries that explicitly require it (TISAX, critical infrastructure).

But SOC 2 can be a valuable additional proof, especially if you operate internationally. US customers understand SOC 2 and know what the report means. European customers familiar with the US market also accept SOC 2 as a quality credential.

The strategic recommendation for internationally active European organizations: build your ISMS under ISO 27001 and add SOC 2 when demand from the US market justifies it. The ISMS forms the foundation; SOC 2 provides the additional proof for the US market. The incremental cost for SOC 2 when ISO 27001 is already in place is manageable because most controls are already implemented and documented.