FEDERAL BUSINESS DEVELOPMENT
PSC Service Codes Reference: The Lettered Categories and How to Find Subcodes
Service Product Service Codes (PSCs) start with a letter, and each letter is a broad category with four-character subcodes beneath it. This page lists the top-level categories and explains how to find the exact subcode for your services. The full, current list of subcodes is in the PSC Manual on Acquisition.gov.
What are the top-level service code letters?
- A
- Research and Development
- B
- Special Studies and Analyses (not R&D)
- C
- Architect and Engineering Services, Construction
- D
- Information Technology and Telecommunications Services
- E
- Purchase of Structures and Facilities
- F
- Natural Resources and Conservation Services
- G
- Social Services
- H
- Quality Control, Testing, and Inspection Services
- J
- Maintenance, Repair, and Rebuilding of Equipment
- K
- Modification of Equipment
- L
- Technical Representative Services
- M
- Operation of Government-Owned Facilities
- N
- Installation of Equipment
- P
- Salvage Services
- Q
- Medical Services
- R
- Professional, Administrative, and Management Support Services
- S
- Utilities and Housekeeping Services
- T
- Photographic, Mapping, Printing, and Publications Services
- U
- Education and Training Services
- V
- Transportation, Travel, and Relocation Services
- W
- Lease or Rental of Equipment
- X
- Lease or Rental of Facilities
- Y
- Construction of Structures and Facilities
- Z
- Maintenance, Repair, or Alteration of Real Property
The letter I is not used as a service code, so if you see “I” for equipment maintenance in older material, it should read J. Category titles can be revised in the PSC Manual, so confirm wording there.
How do four-character subcodes work?
The first character is the letter, and the next three characters narrow the service. For example, within R, subcodes cover program management support, engineering and technical support, and many other professional services. R408, for instance, is used for program management and support services, and R425 for engineering and technical services. Descriptions and codes can be updated, so confirm them in the manual before you use them.
How do you find your subcode?
- Open the PSC Manual on Acquisition.gov.
- Find the letter that fits your service.
- Read the subcode descriptions and inclusion notes. Some subcodes list examples of what belongs and what does not.
- Search USAspending.gov and SAM.gov to see how agencies actually use the code.
- Choose a small set of primary codes, and note nearby codes buyers may use for similar work.
How do PSC codes relate to GSA SINs?
They do not map one to one. MAS SINs define what you can sell on your contract, while PSC codes describe purchases in federal data. A buyer may search by SIN on eBuy and by PSC on SAM.gov. Know both. See GSA MAS SINs Explained.
What can you do with this information?
- Add relevant PSC codes to your capabilities statement and SAM.gov profile
- Research agency spending on your services
- Align your marketing language with buyer terminology
- Spot adjacent opportunities you may not have considered
For a broader explanation, see Federal Supply Classification (FSC) and Product Service Codes (PSC) Explained.
PSC Service Code FAQs
Finding and using the codes that fit your services.
Subcodes, fit, and pricing
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Where is the complete list of subcodes?
In the PSC Manual on Acquisition.gov.
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Can I use more than one service code?
Yes. Many firms have several relevant codes, but keep them consistent with what you actually offer.
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What if my service does not fit any code?
Pick the closest code and describe your services in plain language. Buyers still search by keywords.
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Do PSC codes affect my GSA price?
No. They describe categories for classification and market research.
Put service codes to work
Connect your codes to market research and contract scope.
Focus your federal services market
Talk with TurboGSA about the agencies, requirements, and contract categories that fit your services.