SBA Size Protests 13 CFR 121.404 – When Does Your Business Size Count?

What Is a Size Standard?

A size standard is the numerical threshold — measured in either average annual receipts or number of employees — that determines whether a business qualifies as “small” for a particular industry. The SBA assigns each North American Industry Classification System (NAICS) code a size standard, and a business is small for a given procurement if it does not exceed that threshold, together with its affiliates.

For example, a NAICS code with a 500-employee standard means your company and its affiliates must have fewer than 500 employees to qualify as small. The size standard that applies to your contract is the one assigned to the NAICS code the contracting officer selected for the procurement — not necessarily the code you use for your own bookkeeping.

Getting the wrong standard, or ignoring your affiliates, is how a company certifies itself small when it is not.

The SBA’s August 20, 2026 Proposed Rules: The Biggest Size Standards Overhaul in Decades

On August 20, 2026, the SBA published two interrelated proposed rules in the Federal Register that, if finalized, will represent the most significant restructuring of small business size standards in decades. Every company that relies on a small business set-aside should understand what is coming.

The first is the Revised Size Standards Methodology (91 Fed. Reg. 54096), a notice of availability describing how the SBA proposes to calculate size standards going forward.

The second is a proposed rule, Small Business Size Standards (RIN 3245-AI67), that applies the new methodology to rewrite the actual size standard tables. The headline changes:

•Consolidation from roughly 1,000 six-digit NAICS standards to 338 — 276 at the four-digit level and 62 at the five-digit level — collapsing many industries into broader groups.

•A new three-factor formula replacing the prior seven-factor approach: national industry size, the number of distinct geographic markets, and a net-imports adjustment, combined into a single “average market size” measure.

•Elimination of all size standard caps, with new minimums of 500 employees (for employee-based standards) or $30.6 million (for receipt-based standards).

•A shift toward employee-based standards — of the 338 proposed standards, 208 would be employee-based, 129 receipt-based, and one asset-based, with 86 industries moving from revenue-based to employee-based.

•A productivity adjustment for monetary-based standards, in addition to the existing inflation adjustment.

The SBA estimates the changes could give roughly 114,000 additional companies access to small business contracts, but the consolidation also means many firms will find themselves grouped with larger competitors under a single, higher standard — or pushed out of small business eligibility altogether. Comments on both proposals are due September 21, 2026.

This is a window in which a company’s size status, and its entire set-aside strategy, can be reshaped — and it is exactly the kind of change that triggers a wave of new size protests and appeals. If your eligibility depends on the current standards, now is the time to understand how the proposed rules would affect you.

What are the Legal Requirements for Filing an SBA Size Protest?

A size protest is not a letter of complaint — it is a formal filing governed by 13 CFR 121.1004, and it fails on technicalities more often than on the merits. The requirements that matter most:

• Timeliness. A protest must be received by the contracting officer within five business days (excluding weekends and legal holidays) after bid opening for sealed bids, or after notification of the identity of the prospective awardee for negotiated procurements. 13 CFR 121.1004(a). A protest filed even one day late is automatically dismissed. 13 CFR 121.1004(d).

•Specificity. The protest must be “sufficiently specific to provide reasonable notice as to the grounds upon which the protested concern’s size is questioned,” with some factual basis for the allegation. 13 CFR 121.1004(b). A protest that simply alleges “the awardee is too big” without facts will be dismissed.

• Written form. The protest must be in writing and signed, and must identify the specific concern being protested and the basis for the challenge.

• Who may file. Generally, an interested party — an offeror for the procurement — may file, though the contracting officer, the SBA, and certain others may file at any time.

The SBA Area Office then has 15 business days to issue a size determination. 13 CFR 121.1009(a)(1). The pattern that recurs in the dismissed cases is always the same: the protestor had a real argument but missed the five-day window, or filed a vague protest without the specific facts the regulation demands.

What to Do — and the Cases That Got Dismissed

The best way to understand what to do is to study what got other protestors dismissed. Recent OHA decisions collected by government-contracts commentator Stan Hinton show the recurring failure points:

•Size Appeal of Team CSI Joint Venture, LLC — OHA held the Area Office correctly dismissed, as untimely, a size protest of a task order award under a long-term IDIQ MAC contract, because the contracting officer had not requested size recertification in connection with the task order. The protestor protested an order that was not protestable.

•Size Appeal of Mission Analytics, LLC — OHA held the SBA properly dismissed a size protest based on information from the procuring agency that the award had been cancelled as part of the procurement.

•The recertification trap — OHA has repeatedly dismissed protests against task orders under long-term contracts where the contracting officer did not request recertification, because SBA will not entertain a size protest against an order under a long-term contract absent that request. 13 CFR 121.1004(a)(3)(iii).

•The specificity trap — OHA dismisses protests that are not “sufficiently specific” and do not include factual allegations supporting the grounds. As OHA has put it, for a size protest you must “bring the receipts” or face dismissal.

The lesson: before you file, confirm (1) that the procurement is actually protestable, (2) that you are within the five-day window, and (3) that you have specific facts — not just suspicion — to support each ground. A size protest filed on a hunch is a fast way to spend legal fees and get dismissed.

Does the SBA Only Look at What the Protestor Complained About, or Can It Find Other Reasons?

This is one of the most consequential strategic questions in size protest practice, and the answer is clear: the SBA is not required to investigate issues beyond those raised in the protest itself. OHA has held that an Area Office “has no obligation to investigate issues beyond those raised in the protest.” If a protestor fails to allege a particular ground — for example, that the awardee should have recertified its size — the Area Office may reasonably choose not to explore that issue, and the protestor cannot raise it for the first time on appeal.

The practical consequence cuts both ways. For a protestor, it means your initial protest must be complete and specific, because you cannot add grounds later.

For a challenged awardee, it means the SBA’s review is bounded by what was actually alleged — but it also means the SBA is not limited to the protestor’s legal theories, and within the grounds raised it can and will examine the awardee’s affiliates, ownership, and control.

The safest assumption is that whatever you put in the protest defines the battlefield.

The Basics of Affiliation and How It Works

Affiliation is the single most common reason a size determination goes against a company, and it is where most size protests are won or lost. Under 13 CFR 121.103, two concerns are affiliated when one controls or has the power to control the other, or when a third party controls or has the power to control both.

It does not matter whether the control is actually exercised — the power to control is enough.

Affiliation arises in specific, recurring ways:

• Ownership — a person or entity owning or controlling 50% or more of voting stock, or a large block of voting stock compared to other blocks.

• Stock options, convertible securities, and merger agreements — if they have a present effect on the power to control.

• Common management — the same officers, directors, or managing members controlling both concerns.

• Identity of interest — family members, common investments, or economic dependence (including a firm deriving 70% or more of its receipts from another firm over three fiscal years) creating identical or substantially identical interests.

• Newly organized concerns — a business formed from the assets or personnel of a former affiliate.

• Joint ventures and the ostensible subcontractor rule — a prime and a subcontractor are treated as joint venturers (and thus affiliated) when the ostensible subcontractor is not similarly situated and performs the “primary and vital” requirements of the contract, or the prime is “unusually reliant” on the subcontractor. 13 CFR 121.103(h)(4).

Negative control matters too: a minority shareholder who can block a quorum or otherwise prevent board action may be found to control the concern.

When SBA finds affiliation, it aggregates the size of the affiliated concerns — and if the combined size exceeds the standard, the company is no longer small.

This is why a company that looks small on paper can lose a size protest because of who owns it, who manages it, or who it subcontracts to.

Does the SBA Always Get It Right? If Not, What Can a Small Business Do Next?

No — the SBA does not always get it right, and the regulations recognize that by providing a specific path to challenge a size determination.

A size determination can rest on a misapplication of the affiliation rules, a wrong NAICS code, an incorrect counting of employees or receipts, or a factual error about ownership or control.

When that happens, the remedy is an appeal to the SBA Office of Hearings and Appeals (OHA) — not a new protest, and not a letter to the contracting officer.

The critical constraint is timing and scope. You must file your size appeal with OHA within 15 calendar days of receiving the size determination.

And OHA’s review is narrow: it examines whether the size determination was based on clear error of fact or law, and it does so on the record that existed at the time the Area Office made its determination. You cannot use the appeal to relitigate the case or to introduce material the Area Office never saw.

The Standard for Filing a Size Appeal to SBA OHA

A size appeal is governed by 13 CFR Part 134, Subpart C, and it has its own rules:

• Deadline. File within 15 calendar days of receiving the size determination.

• Standard of review. OHA will reverse only if the size determination was based on a clear error of fact or law. 13 CFR 134.314. This is a deferential standard — OHA does not re-weigh the evidence, but it will correct a determination that misapplied the affiliation rules, used the wrong size standard, or rested on a factual mistake.

• Record-based review. OHA reviews the evidence in the record at the time the Area Office made its determination. 13 CFR 134.308(a). New evidence is generally not considered.

• Form and length. The appeal petition has formatting requirements (12-point type, numbered pages) and a 20-page limit, excluding attachments. 13 CFR 134.203.

• Burden of proof. The appellant must show the determination was clearly erroneous — a high bar that rewards appeals that pinpoint a specific legal or factual error rather than simply disagreeing with the outcome.

Avoid the Fatal Mistake of Introducing New Arguments on Appeal to SBA OHA

The single most common — and most avoidable — error in a size appeal is raising new arguments or new evidence that were not before the Area Office.

OHA has held, in cases such as Size Appeal of Maximum Demolition, Inc., SBA No. SIZ-5073 (2009), that the review is based on the record at the time of the size determination, and that an appellant cannot inject evidence or arguments it failed to present earlier.

This rule applies in two directions. A protestor cannot, on appeal to SBA OHA, raise a ground it never put in its original protest — OHA has rejected recertification and affiliation arguments raised for the first time on appeal.

And an awardee cannot, on appeal, introduce new documents or new explanations of its ownership or control that it failed to provide to the Area Office during the size determination.

The appeal is not a second bite. Everything you want OHA to consider must be in the record before the appeal is filed — which is why the initial protest and the initial response to the Area Office are where the case is actually won.

Do Pro Se Filers Get Special Treatment In a Size Protest Appeal? Do You Have to Hire an Attorney?

No, and no — but with an important practical caveat. The SBA and OHA do not require a company to be represented by an attorney to file a size protest or a size appeal, and pro se filers receive no special treatment, no leniency, and no relaxed deadlines.

The five-day protest deadline, the 15-day appeal deadline, the specificity requirement, and the 20-page limit apply to everyone equally. OHA has dismissed pro se appeals for the same procedural errors that dismiss represented ones — untimeliness, lack of specificity, and new arguments on appeal.

So you are not legally required to hire an attorney. But the rules are technical, the deadlines are unforgiving, and the consequences of a procedural mistake are dismissal with no second chance.

A size protest or a size appeal to OHA is a legal proceeding governed by 13 CFR Part 121 and Part 134, and the difference between a winning filing and a dismissed one is almost always procedural, not substantive.

Most companies that file pro se lose not because they were wrong, but because they missed a deadline or failed to plead specific facts. If your set-aside eligibility — and the contract behind it — is worth protecting, the cost of counsel is a fraction of what a dismissed protest or a lost award costs.

SBA Size Protest and OHA Size Appeal FAQs

The questions below are the ones our attorneys answer for small businesses every week.

How Fast Do I Have to File a Size Protest?

Within five business days — excluding weekends and legal holidays — after bid opening (for sealed bids) or after you are notified of the identity of the prospective awardee (for negotiated procurements). 13 CFR 121.1004(a). A late protest is automatically dismissed.

What Makes a Size Protest Specific Enough to Survive?

It must identify the specific grounds for questioning the awardee’s size and provide some factual basis for each allegation — for example, naming the affiliate, the ownership percentage, or the subcontractor relationship you believe creates affiliation. A bare allegation that “the awardee is too big” will be dismissed. 13 CFR 121.1004(b).

Can I Raise a New Ground on Appeal That I Forgot to Include in My Protest?

No. OHA reviews the record as it existed at the time of the size determination and will not consider arguments or evidence raised for the first time on appeal. Everything must be in the record before the appeal is filed.

What Is the Deadline to Appeal a Size Determination to OHA?

Fifteen calendar days from your receipt of the size determination. This deadline is strict, and a late appeal is dismissed.

What Standard Does OHA Use to Review a Size Determination?

OHA reverses only for clear error of fact or law. 13 CFR 134.314. It does not re-weigh the evidence, but it will correct a misapplied affiliation rule, a wrong size standard, or a factual mistake.

Will the August 2026 Proposed Rules Change My Size Status?

Possibly — and for many companies, significantly. The proposal would consolidate roughly 1,000 standards into 338, shift many industries to employee-based standards, and set new minimums.

If finalized, some companies will gain small business eligibility and others will lose it. Comments are due September 21, 2026, and this is the moment to assess your exposure.