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Also, the German tax office will look at your UK registered company and your dividend payments and artificially lowered salary, and your German tax domicile, then tax you after the fact directly as if no company existed. Single ownership UK Ltd companies are a black flag to the Finanzamt.

My best advice is to walk into the local Finanzamt and speak to someone. I've always found them to be knowledgeable, courteous and genuinely interested in helping. Explain to them your goals (minimising tax liability / indemnity / etc) and they will advise you where they can (for free).