Understanding third-party assurance: SOC 1, SOC 2 and beyond
In today’s interconnected business environment, organisations rarely operate in isolation. From cloud-hosting and data-processing to payroll and financial systems, critical functions are increasingly outsourced to specialist third parties.
While this brings efficiency and expertise, it also introduces risks, particularly around security, data integrity and regulatory compliance. This is where third-party assurance comes in.
What is third-party assurance?
Third-party assurance provides independent validation that a service provider’s internal controls are designed and operating effectively. These assurance reports give customers and their auditors confidence that key risks – such as security, availability, confidentiality, processing integrity and financial reporting – are being properly managed by their suppliers.
The most common frameworks for this type of assurance are the AICPA’s Systems and Organisation Controls (SOC) 1 and SOC 2 reports, or its international equivalents ISAE3402 and ISAE3000.
Why third-party assurance matters
Third-party assurance plays an increasingly important role in building and maintaining trust across digital supply chains.
For service organisations, obtaining a SOC or ISAE report demonstrates transparency, maturity and control. This help reduce client audit fatigue, streamline procurement and strengthen brand reputation. For customers, it provides peace of mind that outsourced operations meet recognised standards for control and governance.
In an era of growing reliance on external providers, independent assurance isn’t just a compliance exercise, it’s a cornerstone of resilient, trusted business relationships.
SOC 1 (ISAE 3402 equivalent): focused on financial reporting
This report evaluates the controls at a service organisation that are relevant to their clients’ financial reporting.
It’s particularly relevant where a service provider’s systems or processes impact the financial statements of their clients, for example:
- Payroll or pension administration services;
- Fund administration or investment management platforms;
- Accounting, billing or transaction-processing outsourcers;
Data centres or IT service providers hosting financial systems.
SOC 1/ISAE 3402 reports are primarily used by auditors and finance teams to support the external audit of their clients’ financial statements. They form part of the “system of internal control” over financial reporting (ICFR) that auditors must assess under ISA 315 or equivalent standards.
ISAE 3000 (with SOC 2 criteria): broader trust and security assurance
This report addresses a broader range of control objectives, typically across the trust services criteria, specifically security, availability, confidentiality, processing integrity and privacy.
This report is aimed not only at auditors but also at customers, procurement teams and regulators who want assurance that their data and systems are protected.
It’s widely used in such industries as:
- Cloud computing and SaaS platforms;
- Managed IT and cyber security providers;
- Data analytics and processing organisations;
- Fintech and regtech service providers;
- Outsourced HR, payroll and business-process services.
SOC 2 reports are often used to demonstrate compliance and build client trust and can be a competitive differentiator in B2B environments where security and resilience are key procurement criteria.
Type 1 vs type 2 reports
Both reports come in two options:
- Type 1: a point-in-time assessment of whether controls are suitably designed.
- Type 2: a review of both design and operating effectiveness over a defined period (typically six to 12 months).
Type 2 reports provide stronger assurance and are generally preferred by customers, though type 1 reports can be a useful first step for organisations building their control environment.
When a SOC/ISAE report may not be appropriate
While these reports are considered the gold standard for third-party assurance, it’s not always the right or only option. Other assurance mechanisms may be more appropriate depending on the scope, maturity and stakeholder expectations:
Each approach provides varying degrees of assurance, from certification-style attestations (ISO) to audit-based reports (SOC/ISAE) and targeted assessments (AUP or readiness reviews). The right option depends on stakeholder needs, reporting objectives and regulatory context.
Our services
Our team of control assurance auditors specialises in helping organisations design, assess and evidence the effectiveness of their internal control environments.
Whether you’re preparing for your first SOC report, transitioning from ISO certification or seeking a pragmatic route to demonstrate assurance to clients and regulators, we bring deep technical knowledge, audit rigour and commercial understanding to every engagement.
We don’t just test controls. We help you build confidence, credibility and trust in the services you deliver. If your organisation relies on client confidence and operational integrity, now is the time to take control of your assurance journey.
How Moore Kingston Smith can help
Speak to our team today to explore how a tailored control approach can strengthen your market position and demonstrate that your business can be trusted with what matters most.
