The 1979 Taiwan Relations Act directs the President to promptly inform the Congress of any threat to the security or the social or economic systems of the people of Taiwan and of any danger to the interests of the United States that arises from that threat. CBO cannot determine when actions by China could result in the President providing such notice and thus invoking the bill’s reporting requirements. In the event of such a notice, CBO estimates that the required report and other actions would cost less than $500,000 over the 2023‑2028 period; any spending would be subject to the availability of appropriated funds.