SBA Size Standards Explained: How to Know If Your Business Qualifies as Small

You registered on SAM.gov. You picked your NAICS codes. Now a set-aside contract shows up that fits your business perfectly, and you hit the question every first-time contractor hits: am I actually small enough to bid on this?

The answer depends on your industry. The Small Business Administration (SBA) does not use a single definition of “small.” Instead, it sets a different size standard for each NAICS code. Some industries measure size by annual revenue. Others measure by employee count. And the thresholds vary widely: a $30 million IT consulting firm qualifies as small, while a $10 million agriculture operation might not.

This guide walks you through the entire process: finding your size standard, calculating whether you meet it, understanding the affiliation rules that trip up most beginners, and knowing what happens if your business grows past the threshold.

What Are SBA Size Standards?

A size standard is the largest your business can be and still count as “small” for a specific industry. The SBA sets these thresholds under 13 CFR Part 121. They exist to make sure small business programs actually reach small businesses, not large firms claiming the label.

There are two measurement types. Revenue-based standards look at your average annual receipts over five fiscal years. Employee-based standards look at your average headcount over 24 calendar months. Your NAICS code determines which type applies to your business.

This matters because every small business set-aside program requires you to be “small” first. The 8(a) Business Development Program, WOSB, HUBZone, and Service-Disabled Veteran-Owned Small Business (SDVOSB) certifications all start with the same question: does your business fall below the size standard for your industry? If it doesn’t, none of those programs are available to you.

The federal government awarded $183.27 billion in prime contracts to small businesses in FY2024, according to the SBA. That is 28.78% of all federal contracting dollars. Size standards are the gate that determines who gets access to that market.

How to Find Your Size Standard

The SBA provides a free tool that tells you your threshold in under a minute. But you need to understand one critical rule first: the NAICS code on the solicitation controls your size standard for that contract, not the NAICS code you chose when you registered on SAM.gov.

Here is why that matters. Suppose your SAM.gov profile lists NAICS 541611 (Management Consulting, $24.5 million threshold). A contracting officer posts a solicitation and assigns NAICS 541512 (Computer Systems Design, $34.0 million threshold). If you bid on that solicitation, your size is measured against $34.0 million, not $24.5 million. The contracting officer picks the NAICS code that best describes the work, per FAR 19.102.

Step-by-Step: Using the SBA Size Standards Tool

1. Go to the SBA Size Standards Tool.
2. Enter your NAICS code. If you don’t know it, read our NAICS codes guide first.
3. The tool returns your size standard: either a dollar amount (receipts-based) or an employee count.
4. Compare that number to your calculated business size (see the next section).

If you want to browse the full table, the SBA publishes a Table of Size Standards as both a PDF and an Excel file. The current table took effect March 17, 2023.

Common Industry Examples

Revenue thresholds range from $2.25 million (crop and animal production) to $47 million (facilities support services). Employee thresholds range from 100 (some wholesale/retail industries) to 1,500 (aircraft manufacturing and petroleum refining).

Notice the range. A $20 million janitorial company is “small.” A $20 million architectural firm is not. The threshold depends entirely on the industry. Do not assume “500 employees” or “$7.5 million” is a universal cutoff. It isn’t.

How to Calculate Your Business Size

Finding your threshold is the easy part. Calculating whether you fall below it is where most contractors get tripped up. The SBA uses specific formulas, and they differ from what your tax return shows.

Revenue-Based Industries: The 5-Year Average

If your NAICS code uses a receipts-based standard, the SBA calculates your size as follows (per 13 CFR 121.104, effective December 17, 2024):

1. Take your total receipts for each of your five most recently completed fiscal years.
2. Add them together.
3. Divide by five.

That number is your average annual receipts. If it falls below the size standard for your NAICS code, you qualify as small.

What Counts as “Receipts”

This is where confusion starts. “Receipts” is not the same as net profit or taxable income. The SBA defines receipts as all revenue in whatever form received or accrued from whatever source. That includes:

• Sales revenue
• Interest and dividends
• Rents, royalties, fees, and commissions
• Subcontractor pass-through costs (this surprises many first-timers)

Receipts are reduced by returns and allowances but not by standard business deductions. Think of it as your top-line revenue, not your bottom-line profit.

Worked Example: IT Consulting Firm

Your firm does IT consulting under NAICS 541512 (size standard: $34.0 million). Your last five years of total receipts:

Total: $37,500,000. Divided by 5 = $7,500,000 average annual receipts. That is well below the $34.0 million threshold. This firm qualifies as small.

New Businesses: The Weeks-in-Operation Formula

If your business has been operating for less than five full fiscal years, the SBA uses a different formula: total receipts divided by weeks in operation, multiplied by 52. For example, a consulting firm that has been open for 18 months (78 weeks) with $1,560,000 in total receipts: $1,560,000 / 78 weeks x 52 = $1,040,000 annualized receipts.

Employee-Based Industries: The 24-Month Average

If your NAICS code uses an employee-based standard, the SBA counts your average number of employees across all pay periods for the preceding 24 calendar months (per 13 CFR 121.106).

Three rules that catch people off guard:

• Part-time and temporary workers count equally. A part-time employee working 10 hours a week counts the same as a full-time employee working 40.
• Leased and temp agency workers count. If you use a staffing agency, those workers count toward your headcount.
• Affiliate employees count. If you have affiliates (see the next section), their employees are added to yours across the entire 24-month measurement period.

Worked Example: Manufacturing Firm

Your firm manufactures metal stampings under NAICS 332119 (size standard: 500 employees). Over the past 24 months, your average headcount across all pay periods was 312 employees. That is below 500. You qualify as small.

Affiliation: The Rule That Catches Everyone Off Guard

Your business might be small on its own. But the SBA does not look at your business alone. Under 13 CFR 121.103, the SBA counts your revenue and employees together with any business you are affiliated with. Two firms earning $10 million each are treated as one $20 million firm if the SBA finds they are affiliates.

Affiliation does not require ownership. The SBA evaluates the “totality of circumstances” and can find affiliation based on control or even the power to control, whether or not that power is actually used.

The Five Affiliation Triggers

Economic Dependence: The 70% Rule

There is a sixth trigger that deserves special attention. Under 13 CFR 121.103(f), if 70% or more of your revenue comes from a single source over three fiscal years, the SBA presumes you are affiliated with that source. This commonly hits small firms that do most of their work as a subcontractor to one prime contractor. The presumption is rebuttable: you can show that your contractual relationship does not restrict you from selling to others. But the burden of proof falls on you.

The Family Business Trap

Spouses, parents, children, and siblings who own separate businesses are presumed affiliated under the “identity of interest” rule. You can rebut this by showing a “clear line of fracture”: separate offices, separate bank accounts, separate employees, no shared equipment, and no financial dependence between the businesses. But if the SBA finds any overlap, the presumption holds.

What Is NOT Affiliation

Not every business relationship creates affiliation. The SBA specifically exempts:

• SBA mentor-protege relationships. A mentor and protege are not affiliates when bidding as a joint venture under an approved mentor-protege agreement.
• Standard franchise agreements. Quality control, advertising, and accounting provisions in franchise agreements do not create affiliation if you retain the right to profit and bear ownership risk.
• Small Business Investment Company (SBIC) investments. Investment by an SBIC does not trigger affiliation.

The Ostensible Subcontractor Rule

If your subcontractor performs the primary and vital requirements of the contract, the SBA may treat them as your affiliate. This means a small prime contractor that relies on a large sub for most of the work could be found “other than small.” The SBA’s Office of Hearings and Appeals (OHA) decided multiple cases on this issue in 2025 alone.

What Happens When You Outgrow Your Size Standard

Growing past your size standard does not mean you lose every contract overnight. The timing rules matter, and they work in your favor more than you might expect.

Size Is Measured at the Time of Your Offer

The SBA determines your size as of the date you submit your self-certification with your initial offer (per 13 CFR 121.404). Once you win a contract as a small business, you are generally considered small for the life of that contract. Growing past the threshold mid-performance does not disqualify you from a contract you already hold.

When Recertification Is Required

Certain events trigger a requirement to re-evaluate your size status (per 13 CFR 125.12):

• Merger or acquisition: You must recertify within 30 calendar days of any merger, acquisition, or sale that changes controlling interest.
• Contract novation: Recertify within 30 days of an approved novation.
• 5-year anniversary: Long-term contracts require recertification at the 5-year mark.
• Contracting officer request: On Multiple Award Contracts (MACs), the contracting officer may request recertification for specific orders.

The January 2026 Rule Change: Closing the MAC Loophole

A final rule effective January 17, 2026 changed the consequences of recertification on MACs. Previously, a large business could acquire a small business MAC holder and continue competing for set-aside orders on that contract. That loophole is now closed. If you recertify as “other than small” on a MAC because of a merger or acquisition involving a large business, you become ineligible for future set-aside or reserved orders on that MAC.

This rule has real implications for growing contractors considering M&A transactions. If your company holds valuable MAC positions with set-aside orders, a merger with a large firm could eliminate access to those orders going forward.

Planning for the Transition

If you are approaching your size standard, plan ahead:

• Maximize current set-aside opportunities while you still qualify.
• Build past performance on unrestricted contracts so you can compete in full and open competition.
• Consider becoming a mentor in the SBA Mentor-Protege program. You bring resources and experience. Your protege brings small business access.
• Watch for size standard increases. The SBA periodically raises thresholds. A pending increase could keep you in the small business category.

Size Protests: What They Are and How to Prepare

Any competitor can challenge your small business self-certification. This is called a size protest, and the SBA handles it, not the contracting officer. The SBA processed 327 size protests in FY2021 alone, according to SBA OIG Report 22-24.

How the Process Works

1. Filing: Any offeror, the contracting officer, or the SBA can file a size protest. The deadline is five business days after notification of the apparently successful offeror (per FAR 19.302).
2. Forwarding: The contracting officer forwards the protest to the SBA Government Contracting Area Office.
3. Decision: The SBA Area Office determines your size status within 15 business days.
4. Outcome: If you are found “other than small,” you are ineligible for that award. If the protest is dismissed, the award proceeds.

The Consequences of Misrepresentation

Incorrectly certifying as small is not just a lost contract. It is a legal risk. Under 15 U.S.C. 645(d), willful misrepresentation of small business status carries penalties of up to $500,000 in fines and up to 10 years in prison. The False Claims Act adds treble damages on top of that.

These are not theoretical risks. In 2016, En Pointe Government Inc. paid $5.8 million to settle claims it falsely certified as a small business on GSA contracts. In 2024, QuarterLine Consulting paid $3.9 million for misrepresenting its WOSB status after an acquisition eliminated its eligibility. Both cases were triggered by whistleblower lawsuits from competitors.

How to Protect Yourself

• Keep clean records of your receipts calculation and employee counts.
• Document your affiliation analysis. If you have family members or business partners with other companies, write down why you are not affiliated.
• Recalculate your size before every major proposal, not just once at registration.
• If you are close to the threshold, consult a government contracts attorney before self-certifying.

2025-2026 Size Standard Changes

The SBA proposed increasing size standards across 263 industries in August 2025 (Federal Register, 90 FR 52834). The proposed rule covers 259 receipts-based and four assets-based industries. Employee-based revisions are expected next.

What Would Change

If finalized, approximately 11,200 additional businesses would newly qualify as small. The SBA also chose not to lower 213 standards that its analysis suggested were too high, preserving eligibility for 7,882 businesses that would otherwise have lost their small business status.

Here are some of the proposed increases:

Current Status

The comment period closed on October 21, 2025. As of March 2026, the final rule has not been published. Check the SBA’s Federal Register page for updates.

What You Should Do

Look up your NAICS code in the proposed rule. If your current revenue is near your size standard threshold, the proposed increase could bring you into the small business category. If you are already small, a higher threshold gives you more room to grow before reaching the ceiling.

Frequently Asked Questions

How do I know if my business qualifies as small for government contracts?

Use the SBA Size Standards Tool to find the threshold for your NAICS code. Then calculate your average annual receipts (5-year average) or average employee count (24-month average) and compare. If your number falls below the threshold, you qualify.

Does the SBA use revenue or number of employees to measure my size?

It depends on your industry. Most service industries use a receipts-based standard measured in average annual revenue. Most manufacturing industries use an employee-based standard measured in average headcount. Your NAICS code determines which method applies.

Do I have to count my affiliate’s revenue when calculating my size?

Yes. The SBA combines the revenue or employees of all affiliated businesses when determining your size. Affiliation can be triggered by ownership, shared management, family relationships, or economic dependence. Review 13 CFR 121.103 for the full list of triggers.

What happens if my business grows past the size standard?

You do not lose contracts you already hold. Size is determined at the time of your offer, and you remain “small” for the life of that specific contract. Recertification is required for certain events like mergers, acquisitions, and long-term contract anniversaries.

Can my size standard be different for different contracts?

Yes. The contracting officer assigns a NAICS code to each solicitation based on the principal purpose of the work. Your size is evaluated against that specific NAICS code’s threshold. You can be “small” for one solicitation and “other than small” for another.

How does the SBA calculate “average annual receipts”?

The SBA totals your receipts for the five most recently completed fiscal years and divides by five. Receipts include all revenue from all sources, including subcontractor pass-through costs. This is not the same as net profit or taxable income on your tax return.

What is a size protest and can someone challenge my status?

A size protest is a formal challenge to your small business self-certification. Any competing offeror can file one within five business days of learning who won the contract. The SBA Area Office investigates and issues a decision within 15 business days.

Are the SBA size standards changing in 2025 or 2026?

The SBA proposed increasing 263 industry size standards in August 2025. The final rule is still pending as of March 2026. If finalized, approximately 11,200 additional businesses would qualify as small. Check the Federal Register for the latest status.

Next Steps

1. Look up your size standard. Go to the SBA Size Standards Tool and enter your primary NAICS code.
2. Calculate your size. Pull your last five years of tax returns and average your total receipts. Compare to your threshold.
3. Run an affiliation check. List every business you own, your family members own, or where you share management. If any exist, add their revenue or employees to yours and recalculate.
4. Call your local APEX Accelerator. They will review your size calculation for free. Find yours at aptac-us.org.
5. Read our NAICS codes guide if you are not sure which code applies to your business: NAICS Codes for Government Contracting.