13 CFR § 121.405 - May a business concern self-certify its small business size status?

---
identifier: "/us/cfr/t13/s121.405"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "13 CFR § 121.405 - May a business concern self-certify its small business size status?"
title_number: 13
title_name: "Business Credit and Assistance"
section_number: "121.405"
section_name: "May a business concern self-certify its small business size status?"
chapter_name: "SMALL BUSINESS ADMINISTRATION"
part_number: "121"
part_name: "SMALL BUSINESS SIZE REGULATIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 632, 634(b)(6), 636(a)(36), 662, and 694a(9)."
regulatory_source: "61 FR 3286, Jan. 31, 1996, unless otherwise noted."
cfr_part: "121"
---


# 121.405 May a business concern self-certify its small business size status?

(a) A concern must self-certify it is small under the size standard specified in the solicitation, or as clarified, completed or supplied by SBA pursuant to § 121.402(d).

(b) A contracting officer may accept a concern's self-certification as true for the particular procurement involved in the absence of a written protest by other offerors or other credible information which causes the contracting officer or SBA to question the size of the concern.

(c) Procedures for protesting the self-certification of an offeror are set forth in §§ 121.1001 through 121.1009.