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Regulations defining the maximum size limit that a business can reach to qualify for federal small business preferences. Receipts-based standards are determined by summing gross receipts averaged over 5 completed fiscal years (13 CFR § 121.104), and employee-based standards are determined by the average number of employees for each pay period over the preceding 24 calendar months (13 CFR § 121.106).

• SBA Size Standards: A Complete Guide to Small Business Compliance — An authoritative guide to the Small Business Administration (SBA) size standard table, outlining its legal role in government contracting.
• Receipts-Based vs. Employee-Based SBA Size Standards Explained — A breakdown of the two primary measurement bases used by the SBA, explaining when employee counts vs. revenue averages apply.
• Are SBA Size Standards Different by State? Federal Uniformity Rules — Explains the nationwide uniformity of Small Business Administration (SBA) size standard limits across all 50 states.
• SIC ↔ NAICS Concordance Crosswalk — Search and map old SIC codes to modern formats.

1. U.S. Small Business Administration (SBA): Table of Small Business Size Standards
2. Electronic Code of Federal Regulations (eCFR): 13 CFR Part 121 - Small Business Size Regulations
3. Acquisition.gov: Federal Acquisition Regulation (FAR) Part 19 - Small Business Programs