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Statement of Applicability (SoA)

Completing and Maintaining a Statement of Applicability (SoA)

Written by Upendra Varma

Purpose

Guide the ISMS owner through building and maintaining a Statement of Applicability (SoA) that will hold up under audit.

Applies to

ISO/IEC 27001:2022 Annex A controls (93 controls, 4 themes).

Audience

ISMS Manager / Information Security Lead, and anyone preparing or updating the SoA.

Owner

ISMS Manager / Information Security Lead

Approved by

Chief Executive Officer (CEO), or designated Management Representative

Review cycle

Annually, or upon significant change to scope, infrastructure, premises, or risk profile

1. Purpose

This SOP describes how to build and maintain a Statement of Applicability (SoA) for an ISO/IEC 27001:2022 Information Security Management System (ISMS). It sets out the step-by-step process for working through the Annex A control set, deciding applicability, writing justifications, and assigning implementation status — and gives concrete rules for two scenarios that come up often when scoping a smaller or service-only organization.

2. What the SoA Is (Brief Overview)

The Statement of Applicability is a mandatory ISMS document (ISO/IEC 27001:2022, Clause 6.1.3d). For every control in Annex A, it records:

  • Whether the control is applicable to the organization's ISMS (Y/N);

  • The justification for including or excluding it;

  • The organization's documentation/evidence that implements it; and

  • Its current implementation status.

Annex A groups all 93 controls into four themes:

Theme

Covers

Reference range

Count

Annex A 5

Organizational controls

5.1 – 5.37

37 controls

Annex A 6

People controls

6.1 – 6.8

8 controls

Annex A 7

Physical controls

7.1 – 7.14

14 controls

Annex A 8

Technological controls

8.1 – 8.34

34 controls

Each row of the SoA typically captures the following columns:

Column

What it captures

Ref

The Annex A clause number (e.g. 5.1, 7.3, 8.20).

Annex A Control

The control title as written in ISO/IEC 27001:2022 Annex A.

Applicable (Y/N)

Whether the control applies to this organization's ISMS scope.

Justification for Inclusion / Exclusion

The specific, auditable reason the control is included or excluded — tied to the organization's actual scope, assets, and activities.

Related Documentation / Evidence

The policy, procedure, or record that implements the control (or governs the vendor that does).

Implementation Status

Implemented, Partially implemented, or Not applicable — see legend below.

Implementation status is recorded against a fixed legend:

Status

Meaning

Implemented

Control is fully in place and operating, supported by a documented policy/procedure and evidence.

Partially implemented

Control is partly in place; further work, rollout, or formal documentation is planned and tracked.

Not applicable

Control is excluded from the ISMS scope; a specific justification is recorded in the Justification column.

3. Step-by-Step Procedure

  1. Confirm the ISMS scope statement first. The SoA must align to it — know the organization's legal boundaries, locations, people, services, and any technology/infrastructure it owns or operates before marking anything applicable or not.

  2. Work through Annex A control by control, theme by theme (Organizational → People → Physical → Technological). Do not skip controls — every one of the 93 needs an explicit Y/N decision.

  3. Decide applicability (Y/N) for each control using the decision rule in Section 4.

  4. Write a specific justification for each decision. Tie it to the organization's actual scope, assets, and activities — generic text such as “N/A” or “not needed” will not withstand audit scrutiny.

  5. Map related documentation/evidence — the policy, procedure, or record that implements the control (or that governs oversight of a vendor delivering it).

  6. Assign an implementation status (Implemented / Partially implemented / Not applicable) consistent with the Y/N decision.

  7. Route the completed SoA for review and approval by the document owner (e.g. CEO or ISMS Manager) before it is used as an audit record.

  8. Set the review cadence: at minimum annually, and immediately after any significant change to scope, premises, infrastructure, risk profile, or organizational structure.

4. Applicability Decision Rules

4.1 General rule

The default posture is that a control applies. Exclusion is the exception, not the norm, and must be defensible at audit. Use this test for every control:

  • Does the activity, asset, or environment the control governs genuinely not exist in the organization, and is it not planned? → Mark Not Applicable (N), with a specific reason.

  • Does the activity/asset exist but is delivered or hosted by a third party (e.g. a cloud provider)? → The control is still Applicable (Y). Record that it is inherited from the vendor, and rely on the supplier-management controls (5.19–5.22) to provide oversight — do not mark it N just because a vendor performs it.

4.2 Scenario A — No physical office / physical security out of scope

Applies to fully remote organizations with no company-owned or leased premises. In this case, mark the premises-specific controls under Annex A 7 (Physical controls) as Not Applicable, with a justification along the lines of:

“The organization has no physical premises; staff operate remotely from locations not owned, leased, or managed by the organization. Physical security perimeter, entry, and monitoring controls are therefore not applicable to the ISMS scope.”

This does not mean every Physical control can be blanket-excluded — several still apply through the remote working / asset management policies even without an office:

Ref

Control

Typical treatment*

Why

7.1

Physical security perimeters

Typically N

No owned/leased premises to define a perimeter for.

7.2

Physical entry

Typically N

No office entry points to control.

7.3

Securing offices, rooms and facilities

Typically N

No offices, rooms, or facilities exist.

7.4

Physical security monitoring

Typically N

No premises to monitor (CCTV, alarms, etc.).

7.5

Protecting against physical & environmental threats

Often still Y

May still apply to home/remote workspaces, or be inherited from a cloud/coworking provider.

7.6

Working in secure areas

Typically N

No designated secure areas exist.

7.7

Clear desk and clear screen

Often still Y

Applies to remote/home workspaces via the remote working policy, even with no office.

7.8

Equipment siting and protection

Typically N

No company-sited equipment to protect.

7.9

Security of assets off-premises

Often still Y

Applies whenever staff use laptops/devices remotely.

7.10

Storage media

Often still Y

Applies if any physical or removable media is used or issued to staff.

7.11

Supporting utilities

Typically N

No premises with power/cooling/utilities to protect.

7.12

Cabling security

Typically N

No office cabling to secure.

7.13

Equipment maintenance

Often still Y

Applies if the organization issues and maintains any equipment (laptops, phones).

7.14

Secure disposal or re-use of equipment

Often still Y

Applies whenever company-owned equipment is retired or reassigned.

* Confirm each “typical” treatment against the organization's actual facts (e.g. a coworking membership, storage of physical files, or company-issued hardware can bring a control back into scope).

4.3 Scenario B — No infrastructure / service-only organization

Applies to organizations that do not own, build, or operate any IT infrastructure, network, or production systems — e.g. a services/consulting business that runs entirely on third-party SaaS tools and does no software development. In this case, mark the infrastructure- and network-specific controls under Annex A 8 (Technological controls) as Not Applicable, with a justification along the lines of:

“The organization does not own, operate, or host any IT infrastructure, network, or production systems, and does not develop software. Infrastructure- and development-related controls are therefore not applicable to the ISMS scope.”

Ref

Control

Why it is typically Not Applicable

8.6

Capacity management

No owned infrastructure/systems whose capacity needs monitoring.

8.9

Configuration management

No systems or servers to configure or harden.

8.14

Redundancy of information processing facilities

No processing facilities exist to make redundant.

8.16

Monitoring activities

No systems/network to monitor for anomalous behaviour.

8.17

Clock synchronization

No systems generating logs that need synchronized clocks.

8.18

Use of privileged utility programs

No systems with utility programs to restrict.

8.19

Installation of software on operational systems

No operational systems onto which software is installed.

8.20

Networks security

No organization-operated network to secure.

8.21

Security of network services

No network services are provided or operated.

8.22

Segregation of networks

No network environment to segregate.

8.27

Secure system architecture and engineering principles

No systems are architected or engineered by the organization.

8.28

Secure coding

No software is developed in-house.

8.29

Security testing in development and acceptance

No development activity to test.

8.31

Separation of development, test and production environments

No such environments exist.

8.34

Protection of information systems during audit testing

No information systems exist to protect during audit/testing.

Endpoint, identity, and data-handling controls almost always remain applicable even in this scenario, because staff still use devices and handle business data:

Ref

Control

Why it usually stays Applicable

8.1

User endpoint devices

Staff still use laptops/phones to deliver the service.

8.2 / 8.3

Privileged access rights / Information access restriction

Staff still hold accounts and access to SaaS tools and business data.

8.5

Secure authentication

Login/MFA to email, SaaS, and business systems still applies.

8.7 / 8.8

Malware protection / Vulnerability management

Endpoint devices still need protecting and patching.

8.10 – 8.13

Information deletion, data masking, DLP, backup

Business data still exists and is still processed, stored, and needs protecting.

8.24

Use of cryptography

Data in transit/at rest on endpoints and SaaS tools still needs encrypting.

8.32

Change management

Still applies to any change affecting information or access, even without owned infrastructure.

5. Common Pitfalls

  • Excluding a control without a specific, auditable reason — “not needed” or “N/A” alone will not pass the audit.

  • Treating a vendor-delivered control as Not Applicable instead of Applicable-with-inherited-implementation (governed via supplier oversight controls).

  • Blanket-excluding an entire Annex A theme (e.g. all of Annex A 7 or all of Annex A 8) instead of assessing each control on its own facts.

  • Leaving the SoA out of sync with the ISMS scope statement and risk assessment — all three must tell the same story.

  • Forgetting to re-review the SoA when the organization opens/closes an office, adopts or drops infrastructure, or changes its service model.

6. Review, Approval and Maintenance

The SoA is a controlled ISMS record. It must be reviewed and formally approved by the document owner (typically the CEO or ISMS Manager) before being relied on as an audit record, and re-reviewed at least annually or whenever scope, infrastructure, premises, or risk materially change. Version history and approval dates should be tracked in the document header, consistent with the organization's document control procedure.

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