HMRC Reclassifies US LLCs as Opaque Entities, Creating Double-Taxation Risk

HMRC's April 2025 reclassification of US LLCs as opaque entities creates a structural mismatch with IRS treatment, exposing UK residents to double taxation not adequately addressed by existing tax treaties. The regulatory shift, quietly signaled since 2023 but largely unnoticed by formation guides, forces UK founders to reassess their tax compliance strategies. This represents a critical blind spot in UK-US tax coordination with significant implications for thousands of founders.