Quick Answer: SOC reports are independent audit examinations of a service organization's internal controls. SOC 1 focuses on controls relevant to financial reporting, SOC 2 examines controls over security, availability, processing integrity, confidentiality, and privacy, and SOC 3 is a public-facing summary of SOC 2 results. If your business provides services that affect clients' financial statements or handles sensitive data, you likely need a SOC report.
What Are SOC Reports?
System and Organization Controls (SOC) reports were developed by the American Institute of Certified Public Accountants (AICPA) to provide assurance about the controls at a service organization. When a company outsources critical functions — payroll processing, cloud hosting, data storage — its stakeholders need confidence that the service provider has adequate internal controls in place.
SOC reports are issued by independent CPAs after a thorough examination of the service organization's control environment. Think of them as a third-party attestation that says: "We verified this company's controls, and here is what we found." Understanding audit evidence types and procedures helps contextualize how SOC auditors gather and evaluate their findings.
SOC 1: Controls Over Financial Reporting
A SOC 1 report examines controls at a service organization that are relevant to the user entities' financial reporting. This is the go-to report when your service could materially affect a client's financial statements.
When You Need SOC 1
Common scenarios requiring SOC 1 include:
- Payroll processing companies that calculate wages, taxes, and deductions
- Benefits administrators handling employee health and retirement plans
- Trust companies managing client assets or investment accounts
- Loan servicers processing interest, principal, and escrow payments
If an error in your service would flow directly into a client's general ledger or financial statements, SOC 1 is the appropriate framework. Auditors of the client company rely on SOC 1 reports to avoid having to physically audit every service provider themselves.
SOC 1 Type I vs. Type II
A Type I report evaluates the design of controls at a specific point in time. It answers the question: "Were the controls suitably designed as of this date?" A Type II report goes further — it tests the operating effectiveness of controls over a minimum period of six months. Type II is far more valuable to users because it confirms controls actually worked in practice, not just on paper.
SOC 2: Controls Over Trust Services Criteria
SOC 2 is the most widely requested report for technology and cloud-based service providers. It evaluates controls based on the AICPA's Trust Services Criteria (TSC), which cover five categories:
- Security: Protection against unauthorized access, both logical and physical
- Availability: System availability for operation and use as committed
- Processing Integrity: System processing is complete, valid, accurate, timely, and authorized
- Confidentiality: Information designated as confidential is protected
- Privacy: Personal information is collected, used, retained, and disclosed in conformity with commitments
Not every SOC 2 engagement covers all five criteria. Most organizations start with Security as the baseline and add Availability and Confidentiality as customer demands require. Processing Integrity and Privacy are less commonly included but may be critical in certain industries like healthcare or financial services.
SOC 2 Type I vs. Type II
Similar to SOC 1, Type I evaluates design only, while Type II tests operating effectiveness over a review period. Most clients and prospects will specifically request SOC 2 Type II reports — a Type I report is increasingly seen as insufficient for vendor risk assessments.
Organizations with internal control deficiencies should remediate those gaps before beginning a SOC 2 engagement, as the auditor's findings directly impact the report's opinion.
SOC 3: Public Summary Report
A SOC 3 report is essentially a redacted version of a SOC 2 Type II report. It covers the same Trust Services Criteria but removes the detailed description of controls and test results. The result is a document suitable for public distribution — you can post it on your website or share it with prospective customers without exposing your internal control details.
SOC 3 is best suited for organizations that want to demonstrate compliance publicly without revealing proprietary control descriptions. However, most sophisticated customers will still request the full SOC 2 report under NDA.
SOC Report Comparison Table
| Feature | SOC 1 | SOC 2 | SOC 3 |
|---|---|---|---|
| Focus | Financial reporting controls | Trust Services Criteria | Public summary of SOC 2 |
| Audience | User entity auditors | Customers, stakeholders | General public |
| Distribution | Restricted (under NDA) | Restricted (under NDA) | Unrestricted |
| Type I | Design only | Design only | N/A |
| Type II | Design + effectiveness | Design + effectiveness | Based on Type II |
| Framework | SSAE 18 (AT-C 320) | AT-C 205 (TSC) | AT-C 205 (TSC) |
Which SOC Report Does Your Business Need?
Choosing the right SOC report depends on the nature of your services and who will use the report:
- Do your services affect clients' financial statements? You need SOC 1. Examples include payroll processors, trust companies, and benefit plan administrators.
- Do you store, process, or transmit sensitive client data? You need SOC 2. This covers SaaS companies, cloud hosting providers, data centers, and IT managed service providers.
- Do you need a public-facing compliance document? SOC 3 serves this purpose but is almost always paired with a SOC 2 Type II engagement.
Many organizations undergo both SOC 1 and SOC 2 engagements, particularly those in financial technology that both handle client funds and process sensitive data. The concept of materiality in audits plays a role in determining the scope and depth of each SOC examination.
How to Prepare for a SOC Audit
Preparation is the most important factor in a successful SOC engagement. Rushing into an audit without adequate preparation often results in exceptions and qualified opinions that undermine the report's value.
Step 1: Conduct a Readiness Assessment
Before engaging a CPA firm, perform an internal gap analysis against the applicable criteria. Identify missing controls, incomplete documentation, or processes that lack monitoring. Many firms offer a formal readiness assessment as a precursor to the actual examination.
Step 2: Document Your Control Environment
SOC auditors expect comprehensive documentation including policies, procedures, flowcharts, and evidence of control operation. Key documents include information security policies, change management procedures, incident response plans, and access control matrices. Organizations with strong audit quality control practices typically find SOC preparation more straightforward.
Step 3: Remediate Gaps
Address any deficiencies identified during the readiness assessment. Common gaps include lack of formal risk assessments, inadequate logical access controls, missing incident response procedures, and insufficient monitoring and alerting. Allow adequate time for remediation — most organizations need three to six months.
Step 4: Collect Evidence of Operating Effectiveness
For Type II engagements, you need evidence that controls operated effectively throughout the review period. This means retaining audit logs, access review records, change approval tickets, and monitoring reports. Start collecting this evidence well before the examination begins.
Cost and Timeline Expectations
SOC audit costs vary significantly based on the scope, type, and complexity of the engagement:
- SOC 1 Type I: $15,000–$40,000
- SOC 1 Type II: $25,000–$75,000
- SOC 2 Type I: $20,000–$50,000
- SOC 2 Type II: $30,000–$100,000+
Timeline for a first-time Type II engagement typically runs six to nine months from readiness assessment through report delivery, with the examination period covering a minimum of six months of operating evidence.
Key Takeaways
- SOC 1 covers financial reporting controls; SOC 2 covers Trust Services Criteria (security, availability, processing integrity, confidentiality, privacy)
- Type II reports test operating effectiveness over time and are far more valuable than Type I design-only reports
- SOC 3 is a public-facing summary of a SOC 2 report — not a standalone examination
- Most sophisticated clients will request Type II reports specifically
- Thorough preparation, including a readiness assessment and gap remediation, is essential for a clean opinion
- Budget $20,000–$100,000+ depending on scope and allow six to nine months for a first-time Type II engagement
