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Class 8422 - Defense activities

PSIC Class 8422 covers Defense activities. Current child subclasses include Defense Activities. This four-digit layer is useful when comparing neighboring activities before landing on the five-digit subclass most...

Level Class
Hierarchy depth 4/5
Children 1
Last verified 2026-05-12
About this level

Practical summary

Class 8422 sits in the PSIC 2019 hierarchy under O Public Administration and Defense; Compulsory Social Security > 84 Public Administration and Defense; Compulsory Social Security > 842 Provision of services to the community as a whole. This class usually fans out into more specific subclasses such as Defense Activities. It is the level people use when they already know the activity family but still need the exact five-digit match.

Administrative context

Where this code is used

This class is used when a business can already narrow the activity family and only needs to compare the final subclasses such as Defense Activities. It is the level most often checked before a five-digit decision is finalized.

Selection note

How to choose it

Use this class to choose between its final subclasses such as Defense Activities. If two options look close, compare the exact activity, the outputs and the way the business actually earns revenue.

Official note

Source-backed description

This class includes: Administration, supervision and operation of military defense affairs and land, sea, air and space defense forces such as: combat forces of army, navy and air force; engineering, transport, communications, intelligence, material, personnel and other non-combat forces and commands; reserve and auxiliary forces of the defense establishment; military logistics (provision of equipment, structures, supplies, etc.); health activities for military personnel in the field Administration, operation and support of civil defense forces Support for the working out of contingency plans and the carrying out of exercises in which civilian institutions and populations are involved Administration of defense-related R&D policies and related funds This class excludes: Scientific research and development, see division 72; Provision of military aid to foreign countries, see 8421; Activities of military tribunals, see 8423; Provision of supplies for domestic emergency use in case of peacetime disasters, see 8423; Educational activities of military schools, colleges and academies, see 8540; Activities of military hospitals, see 8610.

FAQ

What does PSIC Class 8422 cover?

PSIC Class 8422 is the four-digit layer that sits just above the final subclasses and usually defines the activity family for Defense activities.

How do I compare Class 8422 with the sibling classes?

Read the neighboring classes and compare the exact wording of the child subclasses. Nearby options include 8421 Foreign affairs and 8423 Public order and safety activities.

Why does Class 8422 matter for a filing decision?

It is usually the last broad checkpoint before the five-digit subclass choice, so it is the right place to catch near-miss classifications.