Top 10 Best Soc 1 Audit Services of 2026

Coalfire’s SOC 1 engagements center on building an audit-ready system description and mapping control objectives to control activities for the service environment, including logical access and change practices. Audit delivery uses structured walkthroughs and evidence request handling that reduce ambiguity for user entities reviewing complementary controls. The firm’s engagement approach also supports both Type 1 reporting on control design and Type 2 reporting on operating effectiveness with test planning tied to risk.

A tradeoff appears in audit scope management because complex subservice organization boundaries and complementary control expectations can require more back-and-forth during scoping and carve-out decisions. Coalfire fits situations where an organization needs consistent annual execution across releases and evidence cycles, rather than ad hoc support for a single reporting period.

BDO’s SOC 1 engagements focus on producing audit outputs that user entities can consume during downstream control mapping, including clear control narratives and audit-ready evidence expectations tied to control objectives. The delivery pattern supports organizations with multiple systems and process boundaries because BDO can coordinate evidence collection and walkthrough coverage across service components. Strong fit signals include structured engagement communications and an audit approach that documents how each control addresses identified risks rather than relying on high-level attestations.

A practical tradeoff is that BDO’s controlled documentation and evidence workflows require tight internal ownership from the service organization, especially during sample testing and exception testing. BDO fits best when a service organization needs consistent results across multiple control areas such as logical access controls, change management, and computer operations. It also fits when user entities expect a bridge letter or carve-out method to be explicit in how responsibilities are allocated between parties.

EY is a strong fit when a service organization requires tight alignment between control design claims and what is verifiably supported in operations records. Delivery quality is reinforced by repeatable audit workflows for walkthroughs, control testing, and exception handling, plus documentation that user entities can map to complementary control expectations. The main integration signal in this category is not a software interface, but how consistently EY converts system and process facts into a coherent audit narrative and evidence request structure.

A practical tradeoff is that EY’s audit strength favors organizations with mature documentation and stable operating rhythms, since evidence readiness and change discipline affect walkthrough outcomes and control testing scope. EY performs best when the service organization has clear boundaries for inclusions and carve-outs, and when the reporting timeline needs dependable coordination across multiple control owners.

KPMG brings SOC 1 audit depth through large-firm control testing rigor and standardized audit execution across finance, payments, and data security domains. Its delivery emphasizes tight alignment between the system description, control objectives, and control testing evidence so user entities can map results to their complementary user entity controls.

PwC delivers SOC 1 audits that translate financial-reporting risks into tested control activities for service organizations. The firm’s audit work typically includes detailed system description reviews, evidence request list coordination, and control walkthroughs tied to management assertions.

KirkpatrickPrice serves as an SOC 1 Type 1 and Type 2 service organization audit provider for teams that need a service auditor’s report matched to a defined control narrative. The firm’s core work centers on system description scoping, control objectives mapping, and evidence-backed control testing across key operational and access workflows.

RSM delivers SOC 1 audits with an approach grounded in risk assessment and control testing tailored to each service organization’s system description and operating model. The work typically maps client control objectives to control activities, then documents walkthroughs and sample-based testing results in a format auditors and user entities can use to plan complementary user entity controls.

360 Advanced delivers SOC 1 Type 1 and Type 2 audit services focused on control evidence collection, system description alignment, and consistent walkthrough-to-testing traceability. The service process centers on building a service auditor’s report package that maps management assertions to control activities and supporting evidence requests.

Linford & Co delivers SOC 1 Type 1 and Type 2 assurance support for service organization control environments, with a documented audit workflow built around a client-ready system description. The provider focuses on mapping control objectives to testable control activities and producing evidence request lists that align to walkthrough and control testing needs. Linford & Co is most distinct in how it coordinates audit walkthroughs, control testing, and exception testing artifacts into an auditable package rather than treating SOC delivery as ad hoc document review.

Crowe supports SOC 1 Type 1 and SOC 1 Type 2 engagements with delivery that centers on documented control narratives, evidence handling, and final service auditor’s report production. Crowe is distinct in how it engages with management around walkthroughs, control testing expectations, and coordination for carve-out or inclusive approaches when subservice organizations are involved.