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FATCA compliance for small Foreign Company. What do I need to do?
Unless you started a bank or other kind of a financial institution (brokerage, merchant processor, etc etc), the page you linked to is irrelevant. That said, there's enough in the US tax code for you to reconsider your decision of not living in the US, or at least of being a shareholder of a foreign company. Your compliance costs are going to go through the roof. If you haven't broken any US tax laws yet (which is very unlikely), you may renounce your citizenship and save yourself a lot of money and trouble. But in the more likely case of you already being a criminal with regards the US tax law, you should probably get a proper tax advice from a US-licensed CPA/EA who's also proficient in the Japanese-American tax treaty and expats' compliance issues resolution.