Size standards, are you actually small?
What a size standard is, why small is relative to the code on a notice, and where the affiliation trap can make a business large.
Four checks against the ceiling for your primary code. None of these are about how big your business feels, only about the numbers SBA actually counts.
Your average annual receipts, or your employee count if you are a manufacturer, are under the SBA ceiling for your primary NAICS code
SBA sets a different ceiling for every code, in dollars for most industries and in headcount for manufacturing and a few others.
You checked the standard against the primary NAICS code listed on the specific notice
The same business can be small under one code and large under another. The notice decides which code applies, not your SAM.gov profile from last year.
No parent company, controlling investor, or heavily dependent relationship would add its size to yours
SBA combines your numbers with anyone who controls you, or anyone you depend on so heavily the relationship functions like control.
Your average holds across recent years, not just one unusually strong year
Most receipts-based standards look at a multi-year average, so a single good year does not knock you out by itself, but a real upward trend eventually does.
Verdict
Answer the rules above and the verdict updates as you go.
A size standard is a specific number, not a feeling. The Small Business Administration sets a ceiling for every industry code, and whether you count as small for a given contract depends on where your numbers sit against that one ceiling, not against your own sense of how big you are.
What a size standard actually measures
Every NAICS code, the six-digit label the government uses for an industry, carries its own ceiling: either a dollar amount in average annual receipts or a headcount in employees. SBA sets and periodically updates these ceilings, and they vary a great deal. A code for a consulting service might cap out at a few million dollars in receipts, while a code for a manufacturer might allow several hundred employees. There is no single line that separates small from large across the whole economy. There is only the line for your code.
Small is relative to the code, not to you
The same business can be small under one NAICS code and large under another, because a solicitation gets judged against the primary code assigned to that specific procurement, not against every code your business could claim. A company that does both IT consulting and equipment resale might be comfortably small under one of those codes and over the ceiling under the other. Check the size standard for the code on the notice in front of you every time, rather than trusting a status you confirmed once and filed away.
How receipts and employees get counted
Most size standards run on receipts: a multi-year average of your gross revenue, so one unusually good year does not knock you out of small status by itself, and one unusually bad year does not make a large business small on paper. Manufacturing and a handful of other industries use employee counts instead, typically averaged over recent pay periods rather than a single headcount snapshot. Either way, the calculation looks backward across a stretch of time. It is not a snapshot of today.
Affiliation is the trap
The rule that catches people off guard is affiliation. SBA does not look only at your business, it looks at who controls it. A parent company, a controlling investor, or a business you depend on so heavily that the relationship functions like control, can have its size added to yours for the purpose of the ceiling. A business with twelve employees that is majority owned by a two-hundred-person company is not small under most standards, whatever its own headcount says. Common ownership, shared management, and identity-of-interest relationships (close family members running overlapping businesses, for instance) all get examined too. This is the part worth a second look if your business has outside investors, a parent entity, or one customer it could not survive losing.
Where to check
SBA publishes the full size standards table by NAICS code, and that table, not a rule of thumb from a colleague, is the authoritative source. Cross-reference two things before you bid: the size standard listed for the code, and the primary NAICS code printed on the specific notice, because that second number is what actually applies to that competition. The SBA size standards guide explains the table and how it is organized.
Quarry does not compute your size status for you. That number depends on receipts, ownership, and affiliations that only you can verify, and SBA has the final word if it is ever challenged. What is worth doing yourself, every time, is checking the standard against the actual code on the notice in front of you, not the one you remember from the last one.