NAICS Codes for GSA Schedule: How to Choose the Right Ones

NAICS Codes for GSA Schedule: How to Choose the Right Ones

Your NAICS (North American Industry Classification System) codes in SAM.gov and on your Schedule contract define your official business classification and affect your small business eligibility determinations. Selecting the right NAICS codes for your Schedule application ensures your offerings are properly classified and your size standard calculations are accurate. Many contractors unknowingly list incorrect NAICS codes, which can create eligibility problems on set-aside opportunities.

How NAICS Codes Work in the Schedule Context

Each SIN in the GSA MAS is associated with one or more NAICS codes. When you apply for a SIN, GSA classifies your contract under the applicable NAICS code(s). For size standard purposes, your status as a small business (or large business) is determined under the NAICS code assigned to the specific contract or task order, not your "primary" NAICS code across the board. A company that qualifies as a small business under one NAICS code may be a large business under a different NAICS code for a different requirement.

Common NAICS Codes for Schedule SINs

Key NAICS codes for common GSA Schedule categories include: 541512 (Computer Systems Design Services) for IT services under SIN 54151S, 541611 (Administrative Management and General Management Consulting Services) for management consulting, 541330 (Engineering Services) for engineering consulting, 541519 (Other Computer-Related Services) for cybersecurity and IT support, 561320 (Temporary Help Services) for staffing under SIN 736, and 611430 (Professional and Management Development Training) for training services under SIN 59100.

Annual Recertification for Size Standard

Small business size status must be recertified periodically. For Schedule contracts, size is generally self-certified at the time of original offer and must be updated when your contract is renewed or when you respond to a set-aside order where the contracting agency requests a fresh size certification. If your revenues or employee counts have grown past the applicable size standard, you are no longer a small business under that NAICS code and cannot compete for set-asides reserved for small businesses under that code.

GSA program details verified against GSA.gov and FAI.gov as of March 2026. Requirements, fees, and thresholds change — confirm current details at gsa.gov before submitting your application.