If you are new to government contracting, NAICS codes are one of the first concepts you need to understand. NAICS stands for the North American Industry Classification System — a standardized set of six-digit codes that classify every type of business activity in the United States. Think of them as the government’s way of sorting businesses into industries so that opportunities, size standards, and statistics can be organized consistently.
Why NAICS Codes Matter in Federal Contracting
NAICS codes are not just an administrative detail. They have real consequences for your business in three important ways:
- Small business size standards. The U.S. Small Business Administration (SBA) ties its small-business size standards to NAICS codes. Depending on your code, “small” is defined by either your average annual revenue or your number of employees. That means the NAICS code you select determines whether you count as a small business in your industry — which in turn determines your eligibility for small-business set-aside contracts and certifications.
- Opportunity filtering. Agencies assign a NAICS code to each solicitation they issue. When you search for opportunities, filtering by your NAICS codes is one of the most effective ways to find bids that actually fit what you do.
- Solicitation matching. Contracting platforms match opportunities to your business profile based on your codes. For example, GovQon matches solicitations to your NAICS codes, so choosing the right codes means seeing the opportunities that matter to you. You can try it free for 14 days once your codes are in place.
Understanding the Six-Digit Structure
NAICS codes are hierarchical: the more digits you read, the more specific the description becomes.
- First two digits — economic sector. For example, codes beginning with 54 belong to the professional, scientific, and technical services sector.
- Third digit — subsector. This narrows the sector into more specific groups.
- Fourth digit — industry group. A further subdivision of the subsector.
- Fifth digit — NAICS industry. An even narrower slice.
- Sixth digit — national industry. The full six-digit code designates a specific national industry.
Federal contracting generally works with the complete six-digit code, so you should always go all the way down to the most specific code that accurately describes your work. Do not stop at a broader, shorter code just because it looks convenient — specificity is what makes opportunity matching work.
How Agencies Use NAICS Codes on Solicitations
NAICS codes are a two-way street. When a contracting officer issues a solicitation, they assign the NAICS code that best matches the principal purpose of the acquisition. That assigned code then determines which SBA size standard applies to the solicitation — in other words, it decides who counts as “small” for that particular contract and whether it can be set aside for small businesses.
Agencies also use NAICS codes during market research. Before issuing a solicitation, a contracting officer may publish a “sources sought” notice — essentially asking the market who is out there. Responding to sources-sought notices in your industry is one of the smartest things a new contractor can do: it gets your company on the agency’s radar and can influence how the eventual solicitation is structured. Watch for these notices under your NAICS codes and reply when you genuinely qualify.
How to Find Your NAICS Code
Start by describing what your business actually does in plain language, then search the official NAICS database by keywords. The official NAICS search tool, maintained by the U.S. Census Bureau, lets you type in keywords describing your products or services and see which codes match.
The key principle: choose the code that matches your primary revenue-generating activity — the line of business that brings in the most revenue. Many businesses do several things, but your primary NAICS code should reflect the work you do most.
A worked example
Consider two different firms. An IT services firm that designs, installs, and maintains computer networks would search for keywords like “computer systems” and likely land on a code for computer systems design services. A construction firm that builds commercial buildings, on the other hand, would search for “commercial construction” and land on a very different code. Same economy, completely different industries — and completely different SBA size standards attached to each code. A firm that does both IT support and occasional building renovation work should not pick the code for whichever sounds more impressive; it should pick the code matching where most of its revenue comes from, and list the other as secondary. The lesson: describe what you do, match it to the closest code, and do not borrow a code from a different industry just because it looks favorable.
Primary vs. Secondary NAICS Codes
Your business has one primary NAICS code — the one tied to your main line of business. But you can also identify secondary NAICS codes for other significant lines of business you perform. Listing secondary codes is legitimate and useful: it broadens the set of opportunities you can pursue and keeps your registrations accurate. The important part is honesty — list codes for work you actually perform or can perform, not codes you wish applied to you.
Where to List Your NAICS Codes
Your NAICS codes go in your SAM.gov entity registration profile — SAM.gov is the federal government’s central vendor database, and your profile there is where contracting officers look to learn about your business. Listing your primary and secondary codes in SAM.gov ensures that your business shows up correctly in searches and that your profile reflects the work you can do. Keep this profile current: when your lines of business change, update your codes.
Practical Tips for Getting It Right
- Read the full code description. Do not pick a code based on its title alone — read the detailed description to make sure your activities genuinely fit.
- Check the SBA size standard. Once you have candidate codes, check the size standard for each. Because eligibility for small-business programs depends on the code, this is worth confirming before you finalize your profile.
- When in doubt, call the SBA. The SBA and local Procurement Technical Assistance Centers can help you confirm the right code for your business. It is better to ask than to guess.
- Revisit your codes periodically. If your business evolves — say, you move from pure IT consulting into cybersecurity services — update your NAICS codes to match.
Frequently Asked Questions
Can I list more than one NAICS code?
Yes. You have one primary NAICS code for your main line of business, and you can list secondary codes for other significant business activities. All of them go in your SAM.gov entity registration profile, and each can surface relevant opportunities for your business.
Do NAICS codes expire or change?
Codes do not expire, but the NAICS system is revised every five years to reflect changes in the economy. When a revision happens, some codes are renumbered or redefined, so it is worth reviewing your codes after each revision to make sure they still describe your business accurately.
What happens if I pick the wrong NAICS code?
Picking the wrong code can mean missing the opportunities that fit your business, showing up in the wrong industry searches, or — more seriously — being judged against the wrong SBA size standard, which can affect your eligibility for small-business set-asides. If you realize your code is wrong, correct it in your SAM.gov profile promptly.
Is my NAICS code the same as my PSC or product code?
No. NAICS codes classify your industry and business activity; Product Service Codes (PSCs) classify the specific goods and services the government is buying. Agencies use both on solicitations, so knowing your NAICS codes and the relevant PSCs for what you sell gives you the best coverage when searching for bids.
Where can I verify that I have chosen the right code?
Check your candidate codes in the official NAICS manual, compare them against the SBA’s table of small business size standards, and consider a second opinion from your local Procurement Technical Assistance Center or SBA district office. Getting confirmation before you register is much easier than correcting your profile later.
Getting your NAICS codes right is a small investment of time with an outsized payoff: it determines how you appear in SAM.gov, which opportunities you find, and whether you qualify as small in your industry. Once your codes are set, tools like GovQon can use them to match you with relevant solicitations automatically.
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