SOX vs SOC 2: what each one is, and when you need both
Updated
SOX is a US federal law that requires public companies to maintain and certify internal control over financial reporting; SOC 2 is a voluntary attestation, performed by a CPA firm against the AICPA Trust Services Criteria, that companies pursue because customers demand it. Neither substitutes for the other.
They answer different questions for different audiences — regulators and investors on one side, customers on the other — but the underlying IT controls overlap heavily. Access, change, and operations controls tested for SOX ITGC are largely the same controls a SOC 2 auditor examines, which is why running them as one control set matters.
Two different obligations: legal mandate vs market demand
The Sarbanes-Oxley Act of 2002 is a US federal law. If your company is registered with the SEC as a public issuer, SOX applies — there is no opt-out, and the obligations run to regulators and investors. Section 302 requires the CEO and CFO to certify quarterly that disclosure controls are effective; §404 requires an annual management assessment of internal control over financial reporting (ICFR), which for accelerated filers is also audited by the external auditor.
SOC 2 is not law. It is an attestation engagement defined by the AICPA, performed under its attestation standards, that a company undertakes voluntarily — almost always because customers or prospects require assurance about how their data is handled before they will sign. No regulator compels a SOC 2 report; the market does. A startup with no enterprise customers can ignore SOC 2 indefinitely; a public company cannot ignore SOX for a single quarter.
That difference in origin drives everything else: who defines the scope, who performs the examination, what document comes out the other end, and who is allowed to read it.
Scope: ICFR vs the Trust Services Criteria
SOX scope is financial. The controls that matter are those over the systems, processes, and reports that feed the financial statements — the general ledger, revenue systems, the ITGCs that keep those systems trustworthy, and the entity-level controls around them. Management typically frames the assessment using the COSO 2013 internal control framework, and materiality to the financial statements decides what is in scope. A system that never touches financial reporting is simply out.
SOC 2 scope is defined by the Trust Services Criteria. Security — the common criteria — is included in every SOC 2 examination; availability, processing integrity, confidentiality, and privacy are added at management's election based on what the service commits to its customers. The boundary is the service being described, not the financial close: a SOC 2 report covers the systems that deliver the in-scope service, whether or not they touch a ledger.
The two scopes intersect rather than nest. A payroll SaaS company will find its production platform inside both boundaries; its marketing site is probably inside neither.
Who examines you, and what you receive
Under SOX, the check is performed by your external financial-statement auditor. For accelerated filers, the auditor issues an opinion on ICFR itself as part of an integrated audit conducted under PCAOB standards; management separately makes its own §404 assessment, and the CEO and CFO sign §302 certifications quarterly. The outputs are filed with the SEC and are public.
A SOC 2 examination is performed by a licensed CPA firm under the AICPA attestation standards, and the output is an attestation report containing the auditor's opinion, management's assertion, the system description, and the tests performed. A Type I report opines on the design of controls at a point in time; a Type II report opines on operating effectiveness over a review period. SOC 2 reports are generally restricted-use documents shared with customers under NDA — they are not filed anywhere and are not public.
Cadence follows the same split. SOX is a permanent program with quarterly certifications and an annual assessment; SOC 2 is typically renewed as an annual Type II cycle with a defined review window, because customers expect coverage without gaps between periods.
SOX vs SOC 2 side by side
The comparison compresses well into a table, because the two regimes differ on almost every structural axis while converging on the underlying IT controls.
| Dimension | SOX | SOC 2 |
|---|---|---|
| What it is | US federal law (Sarbanes-Oxley Act of 2002) | Voluntary attestation defined by the AICPA |
| Why you do it | Legally required of SEC-registered public companies | Customers and prospects demand assurance |
| Scope | Internal control over financial reporting (ICFR), typically framed on COSO 2013 | Trust Services Criteria: security always, plus elected categories |
| Who examines | External financial-statement auditor (PCAOB standards); management self-assesses under §404 | Licensed CPA firm under AICPA attestation standards |
| Output | §302 certifications, management's §404 assessment, auditor ICFR opinion for accelerated filers — public filings | Attestation report (Type I or Type II) — restricted use, shared under NDA |
| Cadence | Quarterly certifications; annual assessment | Typically an annual Type II cycle over a review period |
| Audience | SEC, investors, audit committee | Customers, prospects, their auditors |
| Consequence of skipping | Securities-law exposure; executives certify personally | Lost deals and longer security reviews |
Where they overlap: access, change, and operations
For the IT organization, the day-to-day work converges. SOX ITGCs are conventionally grouped into access to programs and data, program changes, program development, and computer operations. The SOC 2 common criteria cover logical and physical access, change management, and system operations. The same provisioning and deprovisioning workflow, the same privileged-access restrictions, the same change-approval discipline, the same access-review campaigns, and much of the same monitoring evidence serve both.
The overlap is real but not total. SOX adds concerns SOC 2 does not test — materiality scoping, IPE completeness and accuracy, deficiency evaluation against financial-statement impact, and executive certification. SOC 2 adds concerns SOX does not reach — the elected criteria such as availability and confidentiality, and the customer-facing system description. Treating one as a subset of the other produces gaps in whichever direction you compressed.
The practical failure mode is running them as two parallel programs: two control lists, two evidence collections, two testing calendars, with the same user-access listing pulled twice and reviewed by two different people. The controls overlap; the busywork multiplies only if the tooling forces it to.
When you need both — and how one control set serves two masters
You probably need both when any of these describe you: you are a public company (or a subsidiary consolidated into one) that sells software or services to other businesses; you are late-stage private and preparing for an IPO while enterprise deals already demand SOC 2; or you are a service organization whose customers are themselves SOX-scoped and expect attestation coverage. In each case SOX arrives on the regulator's timeline and SOC 2 on the sales team's, and the two rarely wait for each other.
The efficient way to carry both is a single canonical control set that each framework maps onto, so a control such as quarterly access review exists once and satisfies its SOX ITGC and SOC 2 obligations at the same time. Evidence gathered for that control — a user-access listing, a change-approval record — is then reused everywhere it legitimately applies rather than pulled twice. When you evaluate GRC or compliance tooling for a combined program, the questions that separate real leverage from repackaged spreadsheets are whether one control maps to many frameworks, whether evidence collected once can serve every control it supports, and whether the SOX-specific surfaces — scoping and materiality, IPE, deficiency aggregation, §302 certification — sit on top of that shared layer instead of in a separate silo.
One boundary holds regardless of tooling: readiness software prepares management's side of both programs — the controls, the evidence, the testing records, the certifications — but it does not replace the examiners. The external auditor's ICFR opinion and the CPA firm's SOC 2 attestation remain their own independent work. Good tooling makes both examinations faster to complete; it does not perform or substitute for either.
Frequently asked questions
Is SOC 2 required by law?
No. SOC 2 is a voluntary attestation defined by the AICPA. No statute or regulator requires it; companies pursue it because customers demand assurance before buying. SOX, by contrast, is a US federal law that applies to SEC-registered public companies whether or not they want it.
Does a SOC 2 report satisfy SOX requirements?
No. SOX requires management's own ICFR assessment, quarterly §302 certifications, and — for accelerated filers — an external auditor's opinion on ICFR. A SOC 2 report addresses none of those. The report type that feeds a SOX program is SOC 1, which covers a service organization's controls relevant to customers' financial reporting; SOX teams rely on vendors' SOC 1 reports and track the complementary user-entity controls (CUECs) those reports assume.
Which should a pre-IPO company do first?
Usually SOC 2, because enterprise customers demand it years before the SEC does — but build the control set knowing SOX is coming. Access, change, and operations controls stood up for SOC 2 become the core of your future ITGC program, and starting them as one canonical control set avoids re-platforming the program at IPO readiness.
How do SOC 2 Type I and Type II relate to SOX cadence?
A Type I report covers control design at a point in time; a Type II covers operating effectiveness over a review period, and is what customers generally expect on an annual cycle. SOX has its own rhythm — quarterly §302 certifications and an annual §404 assessment — so a company running both is effectively always inside some testing window, which is the strongest practical argument for continuous evidence collection over quarterly scrambles.
Can the same evidence be used for both SOX and SOC 2?
Where a control legitimately maps to both, yes — a user-access listing or change-approval record can support a SOX ITGC test and a SOC 2 common-criteria test. Each examiner still applies their own standards, and SOX adds requirements like IPE completeness-and-accuracy support that SOC 2 does not. The efficient pattern is to collect such evidence once, have a named owner accept it, and reuse it across every control it legitimately maps to, with the SOX-specific handling layered on top.
Published by ShipReady Metrics, an evidence-based technology and compliance intelligence platform. This guide is educational and vendor-neutral.