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SOC 1 vs SOC 2 vs SOC 3: Coverage, Audience, When to Get Which

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SOC 1 vs SOC 2 vs SOC 3 confuses buyers because the labels look like a version sequence when they cover three different audit objectives. SOC 1 attests to controls over a customer’s financial reporting under SSAE 18. SOC 2 attests to security and four optional Trust Services Criteria. SOC 3 is a public-distribution summary of a SOC 2 report.

The short version

Use SOC 1 if your service affects how your customers calculate their financial statements (payroll, payment processing, loan servicing, custody). Use SOC 2 if your customers are buying security assurance about how you handle their data. Use SOC 3 if your marketing team wants a public seal to put on a trust page. Most SaaS vendors carry SOC 2 Type 2; payroll and fintech vendors carry SOC 1 plus SOC 2; consumer-facing vendors layer SOC 3 on top.

What SOC 1 does

SOC 1 is governed by SSAE 18 AT-C 320 and is restricted to controls at a service organization that are relevant to user entities’ internal control over financial reporting. The audience is intentionally narrow: the customer’s controller, the customer’s external auditor, and the service organization’s auditor. The AICPA explicitly restricts distribution because the report describes specific financial-reporting risks that would be misleading in marketing contexts.

A SOC 1 is what an external auditor uses to satisfy AS 2601 (PCAOB) or AU-C 402 (AICPA) when a customer outsources a process that flows into the financial statements. Examples include ADP and Paychex for payroll, Bank of New York Mellon for custody, and Fiserv for loan servicing. The auditor reviews the SOC 1 to determine whether the service organization’s controls can be relied on or whether additional procedures at the customer site are required.

SOC 1 comes in Type 1 and Type 2. Type 1 covers controls as designed at a single point in time. Type 2 covers operating effectiveness across an observation period, almost always six to twelve months. Type 2 is the version that satisfies a public-company audit cycle; Type 1 is rarely sufficient for anything beyond an initial readiness milestone.

What SOC 2 does

SOC 2 reports against the AICPA Trust Services Criteria (TSP Section 100). Security is the required category. Availability, processing integrity, confidentiality, and privacy are optional categories that the service organization picks based on customer demand. The 2017 TSC update aligned the control framework to the COSO 17 principles, which is why the SOC 2 control map maps cleanly to enterprise risk frameworks.

The audience is broader than SOC 1: existing customers, prospective customers, regulators, and business partners. Distribution is still restricted (the cover letter says “intended use only”), but in practice almost every B2B SaaS deal over $50K in annual contract value asks for it during procurement. The AICPA’s restricted-use language is binding in theory and routinely ignored in practice once a copy is shared under NDA.

The criteria themselves are principle-based rather than prescriptive. A SOC 2 auditor selects a control population that the service organization claims maps to each criterion, then tests whether those controls were designed appropriately (Type 1) and operated effectively over time (Type 2). Two SOC 2 reports from two different vendors can describe wildly different control sets and still both pass.

What SOC 3 does

SOC 3 is the public-distribution counterpart to SOC 2. It uses the same Trust Services Criteria and the same audit procedures, but the deliverable is stripped down: no detailed control descriptions, no test exception listings, no system description. What remains is the auditor’s opinion paragraph, a one-page summary of the system, and a seal that says the service organization meets the criteria.

Because nothing sensitive remains, SOC 3 can be posted on a public trust page. Microsoft, Amazon Web Services, and Salesforce publish SOC 3 reports for exactly this reason. The SOC 2 stays behind a customer-portal gate; the SOC 3 sits at the bottom of the trust-page footer next to the ISO 27001 certificate.

SOC 3 cannot be issued as a standalone audit. The auditor must perform a full SOC 2 first, then prepare the SOC 3 as a reduced-scope deliverable from the same evidence base. The incremental cost is small ($5K to $15K) because no additional testing is required.

Side-by-side comparison table

Which fits your situation

If your service touches the customer’s general ledger directly, you need SOC 1. Payroll providers, fund administrators, claims processors, payment gateways, custodians, and loan servicers all fall here. The customer’s auditor will eventually ask, and if you don’t have a SOC 1, that auditor will have to perform substantive procedures at your facility, which the customer will then bill back to you. ADP and Paychex both publish multiple SOC 1 reports per year segmented by service line for exactly this reason.

If you are a B2B SaaS or infrastructure provider holding customer data, you need SOC 2. Procurement teams have effectively standardized on SOC 2 Type 2 as the entry ticket to enterprise contracts. The SOC 2 audit process sets out the readiness, fieldwork, and report-issuance milestones; budget six to nine months for a first-time Type 2 if you are starting from scratch on the control documentation.

If your service does both (payment processors are the canonical example), you carry both. Stripe, Adyen, and Marqeta all carry SOC 1 plus SOC 2, with the SOC 1 segmented by service line. The marginal cost of the second report is well under the cost of the first because the control population overlaps substantially.

SOC 3 is a marketing decision, not a compliance decision. If your competitors publish a SOC 3 on their trust page, the absence of one becomes a procurement question you have to answer. If your buyer base is technical and never asks, you can skip it without consequence. Treat it as a low-cost layer on top of an existing SOC 2 program rather than a separate workstream.

Cost comparison

Pricing depends on company size, control count, and observation period. The 2026 ranges below are drawn from active engagement quotes at A-LIGN, Coalfire, Schellman, KirkpatrickPrice, and the regional firms that dominate the mid-market SOC space.

SOC 1 Type 2. A mid-market service organization (50 to 500 employees, single service offering) runs $35K to $90K for a first-year SOC 1 Type 2. Renewal years typically come in 10 to 20 percent lower as the auditor reuses prior-year documentation. Large multi-product service organizations with separate SOC 1 reports per product line easily exceed $250K in aggregate annual SOC 1 spend.

SOC 2 Type 2. The same mid-market vendor pays $40K to $150K for a first-year SOC 2 Type 2 covering security plus availability and confidentiality. Each additional optional criterion adds roughly 10 to 25 percent to the audit fee. Readiness consulting, GRC tooling (Vanta, Drata, Secureframe), and remediation labor frequently add another $40K to $100K to the first-year total cost of ownership before the audit even starts.

SOC 3. The incremental fee for issuing a SOC 3 alongside an existing SOC 2 ranges from $5K to $15K. There is no separate testing, so the work is restricted to drafting the public summary and reissuing the opinion in the unrestricted format.

Pricing has firmed up over the last two years. The wave of GRC-platform-driven price compression that hit the SOC 2 market between 2022 and 2024 has plateaued; 2026 quotes are flat to slightly up year over year as audit firms absorb the cost of PCAOB inspection scrutiny on attestation work and as the regulatory bar for evidence quality rises.

Common mistakes when choosing

Treating SOC 2 as a substitute for SOC 1. Customer auditors cannot rely on a SOC 2 to satisfy AS 2601 or AU-C 402 procedures. If your service flows into a customer’s financial statements, the SOC 2 does not buy you what the customer audit team needs, no matter how thorough the security controls are.

Letting marketing scope the SOC 2. Adding processing integrity and privacy categories sounds defensible until the first audit cycle, when the firm discovers it cannot evidence the controls for the optional categories. A category included on the cover page that fails on the test results is worse than a category omitted from scope. Pick categories based on what enterprise customers actually request in security questionnaires, not on what looks good in a sales deck.

Picking a Type 1 to save money. Type 1 is acceptable as a milestone deliverable while you build toward Type 2 (think pre-Series B startups closing their first enterprise deal). It is not acceptable as a steady-state deliverable for a vendor pursuing the F500. Most enterprise procurement organizations explicitly reject Type 1 reports as evidence of operating effectiveness.

Selecting an auditor based on price alone. SOC 2 reports vary widely in quality. Some auditors deliver a 40-page report with three exceptions; others deliver a 250-page report with zero. The reader (a customer security reviewer) cannot tell which is which unless they audit your auditor, which means brand matters. Schellman, A-LIGN, Coalfire, and BDO carry meaningful weight with enterprise procurement. Regional firms can be excellent, but the reader weight is lower.

Skipping the readiness assessment. The first-year SOC 2 Type 2 with an unprepared control environment typically produces an opinion with material exceptions, which is functionally a fail for procurement purposes. A six to nine month internal controls testing cycle before the formal observation period starts is the difference between a clean opinion and a remediation slog. The audit firm rotation index data shows that switching auditors mid-cycle compounds this risk.

Frequently asked questions

Can a single audit cover SOC 1 and SOC 2?

The fieldwork can overlap, but the reports are separate deliverables under separate engagement letters because the AICPA attestation standards require distinct opinions. Most firms will discount the combined engagement by 15 to 30 percent versus two standalone audits because the control walkthroughs, evidence requests, and management responses overlap.

Does SOC 2 satisfy GDPR or HIPAA requirements?

Partially. SOC 2 with the privacy category covers many of the GDPR data-handling controls and the HIPAA technical safeguards. Neither standard is satisfied by SOC 2 alone. GDPR requires data protection impact assessments, lawful basis documentation, and breach notification protocols that are outside SOC 2 scope. HIPAA requires a Notice of Privacy Practices and a Business Associate Agreement structure that SOC 2 does not address.

How long does a SOC 3 take to produce?

Two to four weeks after the SOC 2 Type 2 report is final. There is no additional fieldwork; the deliverable is a stripped-down version of the SOC 2 written by the audit firm in their public-distribution template.

Is SOC 2 a certification?

No. SOC 2 is an attestation engagement under SSAE 18. The auditor issues an opinion, not a certification. ISO 27001, by contrast, is a certification issued by an accredited certification body. The distinction matters in procurement because some buyer frameworks require certification specifically and will reject attestation as insufficient.

What is the difference between Type 1 and Type 2?

Type 1 reports cover the design of controls at a single point in time. Type 2 reports cover the design plus the operating effectiveness of those controls across an observation period (typically 3 to 12 months). Type 2 is what enterprise procurement requires; Type 1 is a milestone, not a destination.

Can I share my SOC 2 publicly?

The AICPA restricts SOC 2 distribution to “intended users,” which is interpreted as customers, prospective customers, regulators, and business partners under NDA. In practice, most SOC 2 reports circulate freely once shared. If you want a public-distribution version, issue a SOC 3 alongside the SOC 2.

How does SOC for Cybersecurity fit in?

SOC for Cybersecurity is a separate AICPA report aimed at an entity’s enterprise-wide cybersecurity risk management program rather than a single service offering. It has not gained the procurement traction of SOC 2 and is rare outside of a few financial-services contexts. Most companies looking at SOC for Cybersecurity end up issuing a SOC 2 instead.

Do venture-backed companies need SOC 2 before Series B?

If your customers are enterprise, yes. The pattern across 2024 to 2026 has been that even Series A companies with strategic enterprise pilots are asked for at least a SOC 2 Type 1 with a path to Type 2. The cost of running the program early is materially lower than the cost of losing or delaying a $500K ACV deal.

How do customer security questionnaires reference these reports?

Vendor risk questionnaires typically ask for “SOC 2 Type 2 report” by name as a yes/no item, then ask for the report itself under NDA. Some questionnaires also accept ISO 27001 in lieu of SOC 2 (more common from European buyers). SOC 1 is rarely listed by name in security questionnaires because it is purely a financial-reporting controls report; it appears instead in procurement requests from the customer’s controller or audit team.

How do bridge letters work between SOC 2 cycles?

A bridge letter is a management representation covering the gap between the end of one SOC 2 observation period and the start of the next. Bridge letters are not audited; they are management’s representation that no material changes have occurred since the prior report. Most enterprise procurement teams accept bridge letters for up to 90 days of gap coverage before requiring a fresh Type 2 report. Companies that drop their continuous-evidence discipline between cycles produce weak bridge letters and trigger procurement follow-up questions.