The Estate Plan You Have Doesn't Survive Expatriation

Why renunciation creates tax exposures the family lawyer who built your existing plan is generally not equipped to handle — and what has to be remediated before, not after.

This piece addresses the subset of relocating families that are contemplating formal renunciation of U.S. citizenship — the path that triggers §877A and everything that follows from it. Families who relocate but retain U.S. citizenship face a different set of issues, addressed elsewhere in this series. The remediation work below is specific to the renunciation pathway.

They paid the exit tax. They filed the §877A return. They walked out clean.

Three years later, the family discovers that the dynasty trust their grandfather built in the 1990s — the structure designed to carry wealth across three generations — is now transferring assets to U.S. heirs at a 40% rate that did not exist before the expatriation. The estate attorney who built the plan is competent. The accountant who filed the §877A return is competent. The immigration counsel who shepherded the move is competent. Each professional executed their domain.

Nobody was holding the integrated view.

The exit tax was the visible problem. Solving it triggered a larger, invisible one — and the invisible one operates not in the year of expatriation but for the rest of the family’s life and into the lives of their U.S. heirs. By the time anyone notices, the plan is bleeding wealth at rates that compound across decades.

This is the failure mode that defines wealth-bearing American expatriation. It is not the exit tax. It is the estate-plan unraveling that follows the exit and that the family did not know was coming.

This piece names the mechanics. It also names the structural reason it happens — fragmentation across the family’s professional advisors, each optimizing locally, none holding the global view of how the parts interact across the discontinuity that expatriation introduces. The technical content matters. The integrated picture matters more. Most affluent families discover the integrated picture only after the consequences have started to compound.