"Small business" has a specific legal definition in federal procurement, and it's not what most people assume.
The SBA assigns a different size standard to every NAICS industry code in the economy. A small business in software publishing (NAICS 511210) has average annual receipts below $47 million. A small business in commercial banking (NAICS 522110) has assets under $700 million. A small business in building construction (NAICS 236220) has average annual receipts below $45 million. The threshold depends entirely on your industry.
This matters because federal set-aside contracts, SBA loan programs, and certification eligibility all use these thresholds to determine whether you qualify.
Revenue-based vs employee-based standards
The SBA uses two measurement approaches:
Revenue-based standards (called "receipts" in the regulation) measure average annual gross revenue over the most recent three completed fiscal years. The thresholds vary from $1 million to $47 million depending on the industry. Most service businesses, retail businesses, and wholesalers use revenue-based standards.
Employee-based standards measure the average number of employees over the most recent 24 pay periods (approximately one year). Thresholds range from 100 employees to 1,500 employees. Manufacturing businesses, mining companies, and some engineering and construction firms use employee-based standards.
A few industries use asset-based standards: banking uses total assets rather than revenue or employees.
The complete table of size standards is published by the SBA in 13 C.F.R. Part 121 and is updated periodically as the SBA adjusts thresholds for inflation and economic changes. The most recent comprehensive update was effective March 17, 2023, under the FY2023 NDAA. The SBA also maintains an online Size Standards Tool at sba.gov/size that lets you look up any NAICS code.
How to calculate your revenue
For revenue-based size standards, the SBA measures "annual receipts" as total income plus cost of goods sold, as shown on IRS tax returns. The three-year average is calculated by adding the receipts for each of the three most recently completed fiscal years and dividing by three.
If your business is less than three years old, the calculation uses the period of existence: total receipts divided by the number of years in operation.
A few items are excluded from receipts: proceeds from discontinued operations, proceeds from the sale of capital assets or investments, and tax refunds. These exclusions are defined in 13 C.F.R. § 121.104.
If your business uses a fiscal year different from the calendar year, the three-year window aligns with your fiscal year, not the calendar year.
How to calculate your employee count
For employee-based standards, the SBA counts the average number of employees over the preceding 24 months (24 pay periods if you pay biweekly, or equivalent for other pay schedules). You include all full-time, part-time, temporary, and seasonal employees.
One important rule: you include employees of your entire enterprise, including subsidiaries and affiliates. A 200-employee manufacturing company owned by a holding company with 1,500 total employees across all its businesses may not qualify as a small manufacturer.
Independent contractors and leased employees are generally not counted as employees. But if the SBA determines that a business uses contractors as a means to avoid the employee count, it may count them anyway.
The affiliation problem
Affiliation is the most common reason businesses fail small business determinations — and the most misunderstood part of the size standards system.
The SBA considers two or more businesses to be 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 (13 C.F.R. § 121.103). When businesses are affiliated, the SBA combines their size (revenue or employees) for the purpose of the size determination.
Control can be: - Ownership: Owning 50% or more of another business's voting equity - Management: Having the power to appoint officers or directors, or having officers or directors who work for multiple related companies - Contractual relationships: Long-term exclusive dealing arrangements, franchise agreements, or other contracts that give one business power over another - Economic dependence: If more than 70% of a business's revenue comes from a single customer, the SBA may find an affiliation
For diverse business certification, affiliation rules can create complications. If a minority-owned firm shares office space, back-office support, or management with a related larger company, the SBA may aggregate their sizes. Certification bodies conduct similar analysis.
The size determination process
Businesses self-certify their small business status in SAM.gov when registering. You represent that you meet the size standard for each NAICS code you check. There is no pre-approval or pre-verification — you simply check the box.
But self-certification is subject to challenge. Any interested party — a competitor, the contracting officer, or the SBA itself — can protest a small business size status. If your size is challenged, the SBA's Office of Size Standards conducts a formal size determination. Getting this wrong can result in contract termination and debarment from federal contracting.
Before certifying yourself as small in a given industry: - Verify you're using the correct NAICS code for the specific contract (the applicable size standard is the one for the NAICS code assigned to the procurement, not necessarily your primary business NAICS code) - Calculate your actual three-year average revenue or 24-month employee average - Identify all affiliated businesses and include them in your size calculation - If it's close, consult an attorney who specializes in government contracting
Multiple NAICS codes and program-specific standards
Your business likely spans multiple NAICS codes. The size standard that applies to any given federal contract is the one associated with the NAICS code the contracting officer has assigned to that solicitation — not your "primary" NAICS code, and not the largest revenue NAICS code in your profile.
If you're a technology services company and a contracting officer classifies a procurement under NAICS 541512 (Computer Systems Design Services, size standard: $34 million) rather than 541519 (Other Computer Related Services, size standard: $34 million), the applicable threshold is what's listed for 541512.
This matters because you might qualify as small under one NAICS code but not another. Check the NAICS code in every solicitation you bid on.
Some programs have their own size standards that differ from the general table:
8(a) Business Development Program: Uses the SBA's standard size standards, but also requires the individual owner's net worth (excluding equity in the business and primary residence) to be below $750,000 at the time of initial certification, and below $1 million at the time of any subsequent review.
HUBZone program: Uses standard SBA size standards for the primary NAICS code of the contract.
SBA 7(a) and 504 loans: Use either the standard size standards or an "alternative" size standard: net worth under $20 million AND average net income under $6.5 million for the two years prior to application. Businesses that exceed the NAICS-based size standard may still qualify under the alternative standard.
SBIR/STTR programs: Use 500 employees as the size standard for all industries, regardless of NAICS code.
Using the SBA's Size Standards Tool
The SBA's online tool at sba.gov/size lets you enter a NAICS code and see the current size standard — both the threshold and the measurement type (receipts or employees). The tool is updated when the SBA revises the table.
For each NAICS code you're considering: 1. Look up the size standard 2. Determine whether it's receipt-based or employee-based 3. Calculate your three-year average revenue or 24-month employee average, including affiliates 4. Verify the result is below the threshold
If you're right at the edge, look carefully at the affiliation rules and the exact calculation methodology. A few hundred thousand dollars in revenue can mean the difference between qualifying for set-asides worth millions.
When size standards change
The SBA periodically raises size standards to account for inflation and changes in industry concentration. Businesses that previously exceeded a threshold may find themselves qualifying after a revision. The SBA publishes proposed rule changes in the Federal Register with a public comment period before finalizing.
Recent revisions have generally increased revenue thresholds. The March 2023 revisions raised standards in several industries to account for post-pandemic revenue growth and inflation.
If you're close to a threshold, check whether a revision is pending that would change your status. The SBA's Office of Size Standards publishes proposed rules on federalregister.gov.
Next steps
- Look up your NAICS code at census.gov/naics or through your SAM.gov profile.
- Look up the size standard at sba.gov/size for each NAICS code relevant to the contracts you're pursuing.
- Calculate your average revenue or employee count, including affiliates, for the applicable measurement period.
- Register in SAM.gov and self-certify your small business status for the applicable NAICS codes. Registration is free at sam.gov.
- If you're near the threshold or have complex ownership structures, consult an attorney with government contracting experience before certifying. The SBA's Office of Advocacy at sba.gov/advocacy publishes size standards guidance that may also help.
- Contact your APEX Accelerator for free help understanding which size standard applies to specific contracts you're considering.
