Understanding NAICS Codes and How to Choose the Right Ones

A NAICS code is a six-digit number that classifies what your business does. NAICS stands for the North American Industry Classification System, and the federal government uses it to organize nearly every contract.

These codes matter more than they look. They decide which opportunities show up when you search, and they help determine whether your business qualifies as "small" for a given contract.

Why the code controls your small-business status

The Small Business Administration sets a size standard for each NAICS code. Some are measured by number of employees, others by average annual revenue. The same company can be "small" under one code and "large" under another. That means the code attached to a solicitation directly affects whether you can compete for a set-aside.

How to find your codes

Start with the work you actually deliver, not the work you wish you did. Search the NAICS directory for plain-language descriptions of your services, and note every code that genuinely fits. Most small businesses land on somewhere between three and ten relevant codes.

Choose a primary code carefully

In SAM.gov you designate one primary NAICS code. Pick the one that best represents your core revenue. Buyers and teaming partners often glance at this first to understand what you do.

Do not over-claim

It is tempting to add every code that is even loosely related, hoping to see more opportunities. Resist that. If you list codes for work you cannot actually perform, you will waste time chasing solicitations you are not equipped to win, and you may raise questions during evaluation.

Revisit them as you grow

Your business changes. When you add a service line or move into a new market, update your codes so your registration keeps reflecting reality. Stale codes quietly cut you off from relevant work.

The practical payoff of getting this right is a cleaner opportunity feed. When your codes are accurate, the contracts you see are far more likely to be ones you can realistically win — and you spend your time bidding instead of filtering noise.