The Rulebook That Arrives the Day You Outgrow Small: Cost Accounting Standards

Published 2026 | TIKC NewsWire

There is a whole body of federal cost rules that most small contractors never think about, for one simple reason: small businesses are exempt from it. That body of rules is the Cost Accounting Standards (CAS), and the exemption is real. But it is also temporary. The day you outgrow the size standard, or take on the kind of large negotiated work that triggers coverage, CAS arrives, and it is far better to understand it before that day than after.

What CAS is

CAS (41 U.S.C. 1501-1506, implemented through FAR Part 30 and 48 CFR Chapter 99) is a set of standards that govern how contractors measure, assign, and allocate costs on certain covered negotiated contracts. The goal is consistency: the government wants confidence that you account for costs the same way across proposals and contracts, so pricing and billing are comparable and fair. There are nineteen standards, and larger covered contractors must file a Disclosure Statement describing their cost accounting practices.

The exemptions that protect you today

Several exemptions keep CAS off most small contractors’ plates. The big one is the small business exemption: if you are a small business, CAS does not apply to you. Other common exemptions include firm-fixed-price contracts awarded on adequate price competition without certified cost data, commercial products and services, and contracts below the applicable thresholds. When CAS does apply, it comes in two flavors: modified coverage and full coverage, with full coverage generally triggered when a business unit receives a single large CAS-covered award or a large aggregate of covered awards in a cost accounting period. Confirm the current thresholds, because they are adjusted over time.

Why it becomes an enforcement issue

Once CAS applies, noncompliance has teeth. If your practices do not conform to the standards, or you change a practice without proper disclosure and adjustment, the government can require cost adjustments plus interest, and in some cases penalties. CAS noncompliance also connects to defective pricing and, where a certification is knowingly false, to the False Claims Act. In other words, the transition out of small is exactly when your cost accounting has to level up, because the safety net of the exemption is gone.

What to do now, before it applies

• Know your exemption status. As long as you are small, CAS does not apply, but track how close you are to outgrowing your size standard.
• Build consistent cost practices early. A disciplined, documented accounting system is the foundation CAS will eventually require.
• Watch large negotiated awards. A big cost-type or sole-source award can be the moment coverage attaches.
• Understand flow from primes. When you partner with CAS-covered primes, consistency expectations can reach into how you support your costs.
• Get expert help at the transition. The move from CAS-exempt to CAS-covered is a project, not a form. Plan for it.

Growth is the goal, and CAS is a sign you are getting there. Just make sure your cost accounting grows up on the same schedule your revenue does. Brick by brick.

FAQ

Do Cost Accounting Standards apply to small businesses?

No. Small businesses are exempt from CAS. The exposure begins when you outgrow the size standard or take on the kind of large negotiated, covered work that triggers coverage.

What is the difference between modified and full CAS coverage?

Modified coverage applies a limited set of standards, while full coverage applies all applicable standards and typically requires a Disclosure Statement. Full coverage is generally triggered by larger single or aggregate covered awards.

What happens if I am noncompliant?

The government can require cost adjustments plus interest, and in some cases penalties. Noncompliance can also connect to defective pricing and, where certifications are knowingly false, the False Claims Act.

How do I prepare before CAS applies?

Build consistent, documented cost accounting practices now, track how close you are to outgrowing small, and get specialized help when a large covered award or a size change is on the horizon.

Sources

Federal Acquisition Regulation. (2026). Part 30, Cost Accounting Standards administration.

U.S. Code. (2026). Cost Accounting Standards, 41 U.S.C. 1501-1506; 48 CFR Chapter 99.

This article is general information, not legal advice.