Top 10 Best Soc 1 Audit Services of 2026

Grant Thornton runs SOC 1 engagements with an audit workflow that starts from control objectives and control activities, then ties test steps to the service auditor’s report narrative and management assertion support. Audit execution typically includes walkthroughs that validate how logical access, change management, and computer operations evidence is produced and retained for sampling. Evidence request list management is handled through a defined preparation cadence, which reduces rework when auditors shift from walkthrough validation into control testing.

A practical tradeoff is that engagement success depends on how quickly an organization can produce consistent evidence for each control period and exception testing sample. Grant Thornton fits best when operations, IT, and compliance can support timely access to system logs and change records for both Type 1 and Type 2 cycles. A common usage situation is a financial controls audit for an ERP-connected service where complementary user entity controls are documented clearly and bridge-letter inputs are coordinated early.

KPMG’s SOC 1 delivery process centers on building a clear system description and aligning it to control objectives and control activities through evidence-based control documentation. The engagement model typically runs audit walkthroughs, then executes control testing with sample and exception testing logic used to support the service auditor’s report. Teams that have well-documented change management and computer operations procedures usually experience faster readiness because audit evidence tracks cleanly to testable control statements.

A key tradeoff is that KPMG’s process requires disciplined evidence preparation and stable service scope to keep control testing consistent across periods. KPMG is a strong fit when service boundaries, complementary subservice organization controls, or data flow narratives are likely to change because audit scoping work can be refocused around updated system descriptions. A weaker fit appears when internal teams expect the audit to substitute for missing control design documentation, because KPMG testing expects evidence that already ties to control environment and control activities.

PwC’s SOC 1 delivery model is built around audit planning that maps financial reporting control objectives to control activities and then drives targeted walkthroughs and control testing. Engagement teams commonly manage evidence request lists, sample selection, and exception testing workflows so that control execution claims tie directly to system and operational evidence. PwC also handles carve-out and inclusive reporting approaches when the service scope changes, which reduces ambiguity for user entity reviewers.

A practical tradeoff is that PwC engagements often require strong client-side process documentation and evidence readiness to keep testing throughput steady. PwC fits situations where internal control owners can provide consistent access to system logs, change records, and monitoring artifacts, and where the service description needs frequent alignment with what controls actually do. PwC is also well suited when multiple control categories span logical access, change management, and incident management across a single service scope.

A-LIGN delivers SOC 1 Type 1 and SOC 1 Type 2 engagements focused on financial reporting controls and service organization reporting packages. The firm’s work typically centers on producing audit-ready system descriptions, mapping control objectives to control activities, and supporting auditors through evidence request lists and walkthroughs.

Teams get structured guidance for control testing, sampling and exception testing plans, and the end-state service auditor’s report package. A-LIGN also supports remediation cycles when control execution gaps show up during control testing, so the engagement can align to the user entity narrative expectations.

Coalfire performs SOC 1 Type 1 and SOC 1 Type 2 examinations focused on service organization controls and the associated system description. The delivery approach centers on mapping control objectives to control activities, then validating effectiveness through walkthroughs and control testing across the service environment.

Coalfire also supports controls evidence requests for auditors and coordinates user entity and subservice organization complementary controls when those depend on customer or partner operations. Engagement governance relies on documented audit workpapers and an evidence-ready workflow that reduces last-minute gaps during fieldwork.

EY supports SOC 1 Type 1 and Type 2 engagements for service organizations that need an independently issued service auditor’s report tied to their system description. Delivery centers on scoping control objectives and control activities to match the service footprint, including complementary user entity controls and bridging expectations between entities.

EY’s audit teams run control testing workflows built around evidence requests, walkthroughs, and issue classification tied to audit walkthroughs and exception testing outcomes. Cross-function coordination is a core part of the engagement shape when logical access controls, change management, computer operations, and incident management controls must be validated in an integrated way.

Baker Tilly brings a mid-market audit practice model to SOC 1 Type 2 engagements, with structured workpapers and audit field teams that focus on traceable control evidence. Core capabilities typically include walkthroughs of process and reporting flows, control testing design with documented sample logic, and drafting the service auditor’s report in the expected SOC 1 format.

The firm also supports subservice organization and user entity coordination tasks such as bridging evidence gaps and aligning system descriptions to management assertions. Baker Tilly’s distinct value comes from operational control coverage depth across IT and business processes rather than offering a generic assurance service.

RSM delivers SOC 1 Type 1 and SOC 1 Type 2 audit engagements with a structured audit approach built around financial controls testing and documented evidence collection. Audit planning is geared toward translating customer control objectives into testable control activities, including walkthroughs and sampling for exception testing when needed.

Client workflows typically involve managing evidence request lists, coordinating bridge letter or carve-out style alignment when responsibilities span boundaries, and producing a user entity ready service auditor’s report for management assertions. RSM also fits organizations that need recurring engagement continuity because the deliverables are organized around repeatable control walkthroughs and control testing cycles.

Armanino executes SOC 1 engagements focused on producing a system description and a service auditor’s report that align control objectives to tested controls.

The audit workflow includes walkthroughs, risk-based control testing, and exception handling tied back to the control environment and monitoring controls.

Engagement delivery also emphasizes evidence request management that helps service organizations assemble logical access and change management support for testing.

KirkpatrickPrice supports SOC 1 Type 1 and SOC 1 Type 2 engagements for service organizations that need a service auditor’s report tied to a defined system description. The firm focuses on mapping control objectives to control activities, performing control testing work aligned to the engagement scope, and producing evidence request lists that stay traceable back to walkthroughs and sample selection. It also supports common coordination artifacts like bridge letters and carves workstreams where complementary user entity controls and complementary subservice organization controls must be stated cleanly in the final report package.