How to Qualify as a Small Business: NAICS Codes and Size Standards

To qualify as a small business under federal rules, your company has to fall under the size standard the U.S. Small Business Administration assigns to your industry, measured by either average annual revenue or average number of employees. Most non-agricultural industries have a revenue ceiling somewhere between $8 million and $47 million; employee-based standards run as high as 1,500 workers for heavy industries.¹² The threshold that applies to you depends entirely on how your business is classified, so the first step is finding the right code.

Find Your NAICS Code

Every SBA size standard is tied to a six-digit code from the North American Industry Classification System. NAICS groups businesses by what they do and how they do it, not by what they sell, so two firms selling similar products can end up in different codes if their production methods differ. You look up your code using the U.S. Census Bureau’s NAICS search tool with keywords describing your primary business activity.³

The right code is the one that matches where most of your revenue actually comes from. A firm earning 70 percent of its income from IT consulting and 30 percent from equipment sales uses the IT consulting code, not a retail code. Picking incorrectly can put you under a size standard that is either too strict or too generous for what you really do, and a competitor can challenge your classification after a contract award.

Look Up the Size Standard for That Code

The SBA’s Table of Size Standards at 13 CFR 121.201 pairs each NAICS code with either a revenue ceiling or an employee ceiling.⁴ Service, retail, and construction industries usually get a receipts-based standard. Manufacturing, mining, and some transportation industries get an employee count.

Receipts thresholds for most industries sit in the $8 million to $47 million band. Crop and animal production have a tighter range, from $2.25 million to $5.5 million.¹ Employee-based standards go up to 1,500 workers for industries like aircraft manufacturing, steel mills, petroleum refineries, and scheduled air transportation. Many manufacturing codes use a 500-employee benchmark, but the only reliable answer is the one for your specific code.²

The SBA adjusts these figures periodically. The most recent comprehensive inflation adjustment took effect in 2023, and a proposed rule from August 2025 would revise individual industry thresholds within the current $8 million to $47 million band.¹ Companies can outgrow small business status without noticing when they stop tracking these updates.

How the SBA Measures Your Size

Revenue: The Five-Year Average

For receipts-based standards, the SBA does not use a single year. It averages your total receipts across the most recently completed five fiscal years by adding them up and dividing by five. If you have been operating for fewer than five full fiscal years, whatever partial data you have gets annualized to produce a comparable figure.⁵

Acquisitions carry a trap. If your company acquired another business at any point during that five-year window, the SBA includes the acquired firm’s receipts for the entire measurement period, not just the time after the deal closed. The same rule runs in reverse if your firm was the one acquired.⁵ A single acquisition can push a company over its size standard even where each side was individually small.

Employees: The 24-Month Average

For employee-based standards, the SBA averages the number of people on your payroll across all pay periods in the preceding 24 calendar months. Full-time, part-time, seasonal, and temporary workers all count. No one is left out for working limited hours, and employees of any affiliates get added to your total.⁶

Affiliates Count Toward Your Size

The size standard applies to your company plus every entity the SBA considers an affiliate. Under 13 CFR 121.103, two businesses are affiliates when one controls or has the power to control the other, whether or not that control is actually used. The SBA looks at the totality of the circumstances and can find affiliation even when no single factor alone would establish it.⁷

Common triggers include shared ownership stakes, overlapping management, common investors, and economic dependence through contractual relationships. Family members owning separate businesses can also trigger a finding of affiliation if the SBA concludes they share identical business interests. Where affiliation exists, the revenue and employees of every affiliated entity are combined before the total is compared against the size standard.⁵

Subcontractor Reliance

Affiliation is not only about ownership. If you win a small business set-aside as a prime contractor but rely too heavily on a large subcontractor to actually do the work, the SBA can treat you and that subcontractor as affiliates. Under the ostensible subcontractor rule, this happens when a subcontractor performs the primary and vital requirements of the contract or is one the prime is unusually reliant on.⁸ Once that finding is made, the two companies’ sizes are combined, which almost always ends the prime’s small business eligibility on that award.

Franchisees

Franchisees face a specific version of the affiliation question: does the franchise agreement give the franchisor enough control to create an affiliate relationship? The SBA maintains a Franchise Directory of brands whose agreements have been reviewed and cleared for SBA financial assistance. If your brand is listed, the SBA has already decided the franchise relationship does not create affiliation for lending purposes. If it is not listed, the agreement needs separate review before you can use SBA loan programs.⁹

Register and Self-Certify on SAM.gov

To bid on federal contracts as a small business, you register through the System for Award Management at SAM.gov. Registration produces a Unique Entity Identifier and a Commercial and Government Entity (CAGE) code that federal agencies use to identify contractors.¹⁰

Inside your profile, the Representations and Certifications section is where you affirm that your company meets the SBA size standard for each NAICS code you list. That self-certification carries legal weight. A false size statement can trigger civil penalties of up to $14,308 per false statement under the Program Fraud Civil Remedies Act, and a materially false statement to a federal agency is a felony under 18 U.S.C. 1001, punishable by up to five years in prison.¹¹¹²

SAM.gov registration has to be renewed annually. If it lapses, you become ineligible for new set-aside awards until you fix it.

When Your Size Is Locked In, and When It Isn’t

Your qualifying status is not evaluated once and left alone. For a federal contract, the SBA measures your size as of the date you submit your initial offer that includes price. You self-certify at that moment, using your revenue or employee data from the applicable lookback periods.¹³

Once you win a contract as a small business, you generally remain small for that contract’s life even if you grow past the size standard while performing it.¹³ Two situations force a fresh look. A merger, acquisition, or sale that changes controlling interest requires recertification within 30 calendar days. On long-term contracts lasting more than five years, recertification must occur no more than 120 days before the end of the fifth year and before each option period after that.¹⁴

When you bid on new work, your next self-certification has to reflect current data. If the five-year revenue average or 24-month employee count now exceeds the threshold, you can no longer compete as a small business under that NAICS code. On multiple award contracts, a company that has grown through natural growth can still receive orders where the contracting officer does not ask for recertification, but once a disqualifying recertification happens, the company is ineligible for new set-aside orders and the agency stops counting those awards toward its small business goals.¹⁴

Beyond the Basic Size Standard

Meeting the size standard makes you eligible for general small business set-asides. Several specialized programs add contracting advantages on top of that for businesses with specific characteristics, and each has its own eligibility rules layered on the size requirement:

The 8(a) Business Development Program, for socially and economically disadvantaged owners, with individual owner limits of $850,000 personal net worth, $400,000 adjusted gross income, and $6.5 million in total assets.¹⁵
The HUBZone Program, requiring at least 35 percent of employees to reside in a designated Historically Underutilized Business Zone and the principal office to sit in one.¹⁶
The Women-Owned Small Business Program, requiring at least 51 percent ownership and control by women who are U.S. citizens.¹⁷
The Service-Disabled Veteran-Owned Small Business Program, requiring at least 51 percent unconditional ownership and control by one or more service-disabled veterans; since January 2024, the SBA handles this certification for all federal agencies.¹⁸

These are additional certifications, not substitutes for meeting the underlying size standard. Getting the NAICS code, the size calculation, and the affiliation analysis right is what puts you inside the small business universe in the first place; everything else builds on that.

1
Federal Register. Small Business Size Standards: Monetary-Based Industry Size Standards
2
eCFR. 13 CFR Part 121 – Small Business Size Regulations
3
U.S. Bureau of Labor Statistics. North American Industry Classification System (NAICS) at BLS
4
eCFR. 13 CFR Part 121 – Size Standards Used To Define Small Business Concerns – Section 121.201
5
eCFR. 13 CFR 121.104 – How Does SBA Calculate Annual Receipts?
6
eCFR. 13 CFR 121.106 – How Does SBA Calculate Number of Employees?
7
eCFR. 13 CFR 121.103 – How Does SBA Determine Affiliation?
8
eCFR. 13 CFR Part 121 – Small Business Size Regulations – Section 121.103(h)(3)
9
U.S. Small Business Administration. SBA Franchise Directory
10
U.S. Small Business Administration. Basic Requirements
11
eCFR. 13 CFR Part 142 – Program Fraud Civil Remedies Act Regulations
12
Office of the Law Revision Counsel. 18 USC 1001 – Statements or Entries Generally
13
eCFR. 13 CFR 121.404 – When Is the Size Status of a Business Concern Determined?
14
eCFR. 13 CFR 125.12 – Recertification of Size and Small Business Program Status
15
U.S. Small Business Administration. 8(a) Business Development Program
16
eCFR. 13 CFR 126.200 – What Requirements Must a Concern Meet to Be Eligible as a Certified HUBZone Small Business Concern?
17
U.S. Small Business Administration. Women-Owned Small Business Federal Contract Program
18
eCFR. Eligibility Requirements for the Veteran Small Business Certification Program