The CHIPS Act “national security guardrails” are the strings attached to CHIPS Incentives Program money. A company that accepts a federal incentive award to build or expand semiconductor manufacturing in the United States agrees, as a condition of the award, not to do certain things abroad: it must not materially expand advanced semiconductor manufacturing capacity in a foreign country of concern, and it must not enter certain joint research or technology licensing arrangements involving a foreign entity of concern, for a set period after taking the funds. The guardrails are the mechanism by which Congress tied domestic subsidy to a restriction on offshore expansion.

These conditions are not loose policy statements; they are codified in a Commerce Department final rule. The National Institute of Standards and Technology, which administers the program, issued “Preventing the Improper Use of CHIPS Act Funding” (88 FR 65600), published September 25, 2023. The rule, grounded in the CHIPS Act at 15 U.S.C. 4651 et seq., spells out the definitions and the enforcement. The rule itself describes its scope in its summary.

"The Act requires that covered entities agree not to engage in any material expansions of semiconductor production capacity in foreign countries of concern."— National Institute of Standards and Technology, 88 FR 65600 (Sept. 25, 2023), source

The two clawbacks and the 5 percent line

The rule organizes the guardrails around two prohibited categories that the statute calls clawbacks. The Expansion Clawback addresses material expansions of semiconductor manufacturing capacity in a foreign country of concern. The Technology Clawback addresses certain joint research and technology licensing activities with a foreign entity of concern. The rule states that it “describes the types of conditions that will apply to expansion, joint research, and technology licensing activities,” establishes a process for notifying the Secretary of potentially impermissible activities, and sets out how the Secretary enforces them. If a recipient violates a guardrail, the statutory consequence is recovery of the award — the funding can be clawed back.

The most-cited number in the rule is the “material expansion” threshold. For advanced facilities, the rule sets material expansion at an increase in manufacturing capacity of more than 5 percent. Commenters argued the 5 percent figure would, in practice, cap a facility's capacity for years; the rule's response declines to raise it, stating that doing so “would undermine this objective” because the Act requires recipients to agree not to engage in material expansions in foreign countries of concern. That exchange — the threshold, the objection, and the agency holding the line — is in the rule's own response-to-comments text, which is where a reader who wants the operative number should look rather than a summary.

Notification, not just prohibition

The guardrails are not purely a list of bans; they include an affirmative duty to notify. Under the rule, a covered entity must notify the Secretary of any planned significant transaction involving the material expansion of semiconductor manufacturing capacity in a foreign country of concern — including in cases where the entity believes the transaction may be allowed under an exception. In other words, the burden is on the recipient to flag the transaction and let the Secretary review it, rather than to decide unilaterally that a deal is permitted. A later companion action revised the definition of “material expansion” to clarify that constructing new facilities falls within the rule's scope, closing the reading that only expansions of existing sites counted.

Advanced versus legacy, and what the thresholds reflect

The rule does not treat all chip capacity identically, and the distinction is load-bearing for anyone reading it. The tighter 5 percent material-expansion threshold attaches to advanced facilities; the rule limits the ability to expand legacy semiconductor manufacturing capacity to 10 percent above existing capacity — a separate, higher threshold reflecting a policy judgment embedded in the statute that the most sensitive constraint belongs on leading-edge production. That structure is why a single headline number can mislead: the operative limit depends on whether the facility in question makes advanced or legacy chips, and the definitions in Subpart A of the rule are what assign a given facility to one category or the other. The rule's response-to-comments section also makes clear the agency's posture toward arguments that the thresholds are too strict — when commenters argued the 5 percent figure would effectively freeze a facility's capacity, the rule's response was to decline to raise it, stating that doing so would undermine the statutory objective. The pattern across the rule is consistent: where a choice exists between a looser reading that eases business impact and a tighter reading that preserves the national-security purpose Congress wrote into the CHIPS Act, the rule documents the trade-off and resolves it toward the latter, then provides notification and enforcement machinery to make the line operable rather than merely declarative.

What the record shows

The verifiable facts: the CHIPS Act guardrails are codified in 88 FR 65600 (“Preventing the Improper Use of CHIPS Act Funding,” Sept. 25, 2023), issued under 15 U.S.C. 4651 et seq. They require covered entities to agree not to materially expand semiconductor production capacity in foreign countries of concern (Expansion Clawback) and bar certain joint research and technology licensing with foreign entities of concern (Technology Clawback). The rule sets the advanced-facility material-expansion threshold at more than 5 percent, imposes a duty to notify the Secretary of significant transactions, and provides for clawback of the award upon violation. A subsequent action revised the “material expansion” definition to include new facility construction. None of these terms is editorial characterization; each is drawn from the Federal Register text, which is the authoritative source for what the guardrails require.