When a contracting officer announces the apparent awardee on a small business set-aside, any unsuccessful offeror has five business days to file a size protest challenging whether that firm actually qualifies as small. Size protests are separate from GAO bid protests — they go directly to the SBA and are decided under different rules, different timelines, and different standards of review.
SDVOSB firms face size protests in two situations: defending their own small business status when a competitor challenges them, and deciding whether to file against a competitor whose size appears questionable. Both situations are more common than most small contractors expect — and the outcome determines whether an award stands or is overturned.
What a Size Protest Challenges
A size protest specifically challenges whether the apparent awardee meets the small business size standard for the NAICS code assigned to the procurement. It does not challenge technical evaluation scores, past performance ratings, or pricing — those are GAO protest territory. A size protest asks one question: is this firm actually small?
The SBA determines size using three primary tests:
- Revenue-based size standards: Most service industries use average annual receipts over the prior three fiscal years. The standard varies by NAICS code. Exceeding it makes a firm other-than-small.
- Employee-based size standards: Manufacturing and some other industries use headcount averaged over the prior 12 months, including part-time employees and employees of affiliates.
- Affiliation:The most complex and most litigated dimension. The SBA aggregates revenues and employees across all affiliated firms. If a firm is affiliated with a large company, the affiliate’s revenue counts toward the size standard.
Affiliation: Where Most Size Protests Succeed
Affiliation is the most common basis for a successful size protest and the most counterintuitive rule in small business federal contracting. The SBA will find affiliation — and aggregate the revenue of both firms — based on any of the following:
- Common ownership: Two firms owned by the same individual or family, even if operated separately.
- Common management: The same person serves as an officer or key employee of both firms, or has the power to control both.
- Identity of interest: Firms with substantially identical ownership, management, or other interests that the SBA determines act as one.
- Newly organized concern rule: A new firm formed by former employees of a large company that relies on that company for most of its business may be deemed affiliated.
- Economic dependence: If a firm receives 70% or more of its revenues from a single other firm, the SBA may find affiliation between the two.
- Ostensible subcontractor rule:If a proposed subcontractor will perform the primary and vital requirements of a contract, the SBA may aggregate the sub’s size with the prime’s for size determination purposes. This is a common protest basis against small primes that rely heavily on large teaming partners.
The ostensible subcontractor rule is particularly important for SDVOSB teams. A teaming arrangement where the large subcontractor brings most of the technical capability and staff creates affiliation risk. The SDVOSB must genuinely prime the effort and exercise meaningful management control — not merely pass work through to a larger partner.
How to File a Size Protest
The mechanics of filing are straightforward. The strategic discipline is knowing when and what to allege.
Timeline
You have five business daysfrom the date the contracting officer identifies the apparent successful offeror to file a size protest. This is a hard deadline — late protests are dismissed without review. The clock starts when the CO communicates the award decision, not when you learn of it through other means.
Where to File
Size protests are filed with the contracting officer, who then forwards the protest to the SBA Government Contracting Area Office with jurisdiction over the apparent awardee’s principal office. You do not file directly with SBA. If you file directly with SBA, the CO may not receive timely notice and the protest may be dismissed as untimely.
What to Include
Your protest must identify the solicitation, the apparent awardee, and the specific grounds for the challenge. A protest that alleges only “we believe this firm is not small” without factual basis will be dismissed. You must allege whythe firm does not qualify: specific revenue information, specific affiliation relationships, or specific facts about the firm’s size.
Good protest bases include:
- Public financial information (SEC filings, annual reports) showing revenue above the size standard
- Evidence of common ownership or management with a larger firm
- The firm’s own marketing materials or website describing relationships with large corporate parents or affiliates
- Prior SAM.gov representations where the firm certified as other-than-small under the same NAICS code
- Evidence that the proposed subcontractor will perform the primary work (ostensible subcontractor theory)
How SBA Decides Size Protests
Once a size protest is filed and the CO forwards it to SBA, the SBA Area Office investigates. The apparent awardee is notified and given an opportunity to respond with documentation of its size. The SBA reviews the response and issues a size determination — typically within 15 business days of receiving the protest.
The SBA’s investigation is not limited to what the protester alleged. The Area Office can and does look at affiliation relationships the protester did not identify. A firm that files for a size determination should be prepared for scrutiny of its entire corporate structure, not just the specific allegation.
During the protest, contract performance is generally suspended pending the SBA’s decision, though the CO can make an exception if urgent mission needs require it.
If SBA Finds the Firm Is Other-Than-Small
The CO cannot make award to that firm on the set-aside. The CO can either make award to the next eligible offeror or, in some cases, cancel the set-aside and re-compete as unrestricted. The protested firm cannot appeal the size determination directly to a court — they must appeal to the SBA’s Office of Hearings and Appeals (OHA) within 15 calendar days.
If SBA Finds the Firm Is Small
The protest is dismissed and the award proceeds. The protester has no further appeal rights on the size issue (though unrelated GAO protest grounds remain available).
Defending Against a Size Protest Filed Against You
If you are the apparent awardee and a competitor files a size protest, you will be notified by the SBA Area Office and given a short window — typically three to five business days — to submit documentation of your size.
Preparation before a protest arrives matters more than any response written under pressure. SDVOSB firms that compete on set-asides should maintain a current size determination file containing:
- Three years of tax returns or audited financial statements
- A corporate structure diagram showing all affiliates, subsidiaries, and related entities
- Documentation of any teaming agreements, with analysis of whether the teaming partner creates affiliation risk
- A written affiliation analysis from counsel if your corporate structure is complex or if you have a significant customer concentration
- Prior SBA size determinations, if any, and any changes in corporate structure since those determinations
When to File a Size Protest Against a Competitor
A size protest is a legitimate tool, not a nuisance tactic. File one when you have a genuine factual basis to believe the apparent awardee does not qualify as small. Do not file as a delay strategy when you have no real basis — frivolous protests damage your reputation with the contracting office and do not survive SBA review.
File a size protest when:
- Public information — the firm’s website, news coverage, LinkedIn, or SEC filings — suggests revenue or employee counts above the size standard
- The firm is known to be owned by or closely affiliated with a large business
- The proposal identifies a large subcontractor performing what appears to be the primary technical work, creating an ostensible subcontractor argument
- FPDS shows the firm has been awarded as other-than-small under the same NAICS code in the recent past
For GAO bid protests challenging the technical evaluation — scores, evaluation methodology, or alleged bias — see our guide on the federal bid protest process. Size protests and bid protests are independent tools that can be filed simultaneously on the same award.
SDVOSB Status Protests: A Related Process
Separate from size protests, any interested party can challenge whether an apparent awardee on an SDVOSB set-aside actually meets the SDVOSB eligibility requirements — veteran ownership, veteran control, and the specific documentation requirements. These status protests go to the SBA’s Office of Government Contracting and Business Development (GCBD) rather than the Area Office.
The timeline is the same: five business days from announcement of the apparent awardee. The grounds are different: you are challenging veteran ownership, unconditional control, or another SDVOSB-specific eligibility factor rather than size. For a full breakdown of what SDVOSB eligibility requires and the common documentation failures, see our SDVOSB requirements checklist.