NAICS and PSC Codes Explained for Contractors

Two sets of codes quietly shape your entire federal contracting strategy: NAICS codes and PSC codes. They determine which opportunities you see, whether you qualify as a small business, and how agencies find you. Get them right and the marketplace works for you; get them wrong and you miss opportunities you should be winning. Here is what each one is and how to use them.

What NAICS codes are

NAICS stands for the North American Industry Classification System. It is a standardized set of six-digit codes that classify businesses by industry — one code for residential construction, another for computer systems design, another for janitorial services, and so on. The federal government uses NAICS codes to organize its purchasing: nearly every contract is assigned a primary NAICS code that says what kind of work it is.

Why NAICS codes matter so much

NAICS codes do two critical things for a small contractor. First, they determine which opportunities apply to you — agencies and contractors filter the marketplace by NAICS, so your codes control what you find and what finds you. Second, and crucially, NAICS codes set the small-business size standards. Each code has a size threshold (a maximum number of employees or amount of annual revenue) below which your business counts as “small” for that type of work. Because set-asides depend on being small, your NAICS code literally determines whether you qualify for small-business opportunities in a given field.

Choosing your NAICS codes

You are not limited to one. A business can and should claim every NAICS code that genuinely describes work it can perform, and you select them during your SAM.gov registration. Pick a primary code that best represents your core business, then add all the secondary codes that fit. Be accurate — claiming codes for work you cannot really do wastes effort and can cause problems — but be thorough, because each legitimate code is another doorway into opportunities. Review the size standard for each code so you know where you stand as a small business.

What PSC codes are

PSC stands for Product and Service Code (sometimes called FSC for products). Where NAICS classifies your business by industry, PSC classifies what is being purchased on a specific contract — the actual product or service the government is buying. A PSC might specify “IT and telecom — cybersecurity,” “guard services,” or a particular type of equipment. Agencies tag solicitations with PSC codes, and contractors use them to search for and analyze opportunities at a finer level of detail than NAICS alone.

How NAICS and PSC work together

Think of NAICS as describing the seller and PSC as describing the purchase. A single opportunity will carry a NAICS code (the industry) and one or more PSC codes (the specific products or services wanted). Using both when you search the marketplace gives you sharper, more relevant results: NAICS narrows to your industry, and PSC pinpoints the exact kind of work. Together they let you build precise saved searches so the right opportunities come to you — a core technique covered in our guide to finding government contracts.

Using codes strategically

Smart contractors use these codes as a strategy tool, not just a registration checkbox. By studying which NAICS and PSC codes the agencies you target actually buy under — and which codes your competitors win on — you can position your business where the spending is. You can also analyze historical spending by code to size a market before investing in it. The codes turn the vast federal marketplace into something you can filter, measure, and target deliberately.

Where to find and verify your codes

Finding the right codes is quick once you know where to look. NAICS codes and their current small-business size standards are published by the SBA and the Census Bureau, and you can search them by keyword to find the ones that match your services — then confirm the size standard attached to each. PSC codes live in the government’s official Product and Service Code Manual, also searchable by keyword. A practical shortcut is to find a few contracts similar to the work you do on SAM.gov and note which NAICS and PSC codes those solicitations carry; that tells you exactly how agencies classify the work you want, straight from real opportunities. It is worth verifying your codes once a year, because size standards are updated periodically and your own capabilities evolve — a code that was a stretch when you started may fit perfectly a year later, and a size standard change can affect whether you still count as small. Keep your SAM.gov registration’s codes accurate and current, and revisit them whenever you add a service line. Five minutes of housekeeping keeps the right opportunities flowing to you and keeps your small-business eligibility airtight.

Common mistakes to avoid

The two big errors are claiming too few codes (missing opportunities you qualify for) and claiming codes inaccurately (chasing work you cannot deliver). A third is ignoring the size standards — if you do not know whether you are “small” under a given NAICS code, you cannot know which set-asides you qualify for. Take an hour to get your codes right; it pays back many times over. If you want help mapping your capabilities to the right codes and target agencies, Veteran Forge Strategies assists small and veteran-owned firms with exactly that.

Key takeaways

• NAICS codes classify your industry and set the small-business size standards that gate set-asides.
• PSC codes classify what the government is buying on a specific contract.
• Claim every NAICS code you can legitimately perform — each is a doorway to opportunities.
• Use NAICS plus PSC together to search precisely and target where the spending is.

Frequently asked questions

How many NAICS codes can I have? As many as genuinely describe work you can perform — claim a primary plus all relevant secondary codes.

What is the difference between NAICS and PSC? NAICS classifies your business by industry; PSC classifies the specific product or service being purchased.

Why do NAICS size standards matter? They determine whether you count as a small business for a type of work, which controls your set-aside eligibility.

This article is for general informational purposes only and is not legal or financial advice.