Thinking about moving to Dublin with a foot in both worlds? We walk through the easy part—immigration with dual U.S.–Irish citizenship—and then open the door to the financial maze most folks miss: how two tax systems collide over your retirement savings. The headline insights are clear and practical: the U.S.–Ireland Double Taxation Agreement provides a framework, but the saving clause keeps U.S. citizens within the IRS net. That’s why the foreign tax credit becomes your day-to-day tool, often letting higher Irish tax erase U.S. liability on the same income while demanding precise annual filings.

We break down how traditional 401k and IRA distributions are taxed in Ireland as foreign pension income, how USC layers on, and how Form 1116 typically neutralizes U.S. tax. We also share a potential bright spot: many experts interpret the treaty to allow qualified Roth IRA withdrawals to remain tax-free in both countries, a powerful planning edge if confirmed for your facts. Social Security gets its own carve out too—taxed in Ireland and generally exempt in the U.S. for Irish residents—simplifying that particular stream.

The real hazard isn’t what you withdraw. It’s what grows inside your accounts. Ireland’s deemed disposal rules for offshore funds can trigger tax on unrealized gains every eight years, even with no sale. If the underlying mutual funds or ETFs in your U.S. plans are treated as offshore funds, that phantom tax bill can blow up decades of planned tax deferral. We outline the exact questions to ask a cross-border tax advisor, why you should get guidance in writing, and how to act before you become an Irish resident: review holdings, identify non-reporting funds, consider restructuring or liquidating problem assets, and prepare a cash and compliance plan that respects both systems.

If you’re weighing a move or already packing boxes, this is your roadmap to preserving compounding, avoiding avoidable tax, and turning dual citizenship from a paperwork perk into a financial advantage. Subscribe, share with a friend planning a move, and leave a review with the one rule you most need clarified—we’ll tackle it in a future deep dive. 

More info at Relocating to Ireland for dual-citizenship couple with U.S. assets (https://https://investingforexpats.com/ie/relocating-to-ireland-for-dual-citizenship-couple).

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Moving, Working, and Investing for Americans Abroad