See here for reporting on the proposal, and see page 80 of this document for the full text:

Any firm using computing resources, whether owned by the firm or leased from others, to mine digital assets would be subject to an excise tax equal to 30 percent of the costs of electricity used in digital asset mining.

This market resolves YES if any tax legislation broadly similar to this proposal is passed by the United States House and Senate before the 2026 midterms, regardless of whether it is signed into law or when it becomes effective. Otherwise, this market resolves NO.